CN117481868A

CN117481868A - Conveying device of interventional heart valve

Info

Publication number: CN117481868A
Application number: CN202311203260.4A
Authority: CN
Inventors: 王建安; 张志飞; 曾敏
Original assignee: Hangzhou Qiming Medical Devices Co ltd
Current assignee: Hangzhou Qiming Medical Devices Co ltd
Priority date: 2017-10-24
Filing date: 2018-05-24
Publication date: 2024-02-02
Also published as: CN108652791A; CN108652791B; CN207871027U

Abstract

The invention discloses a conveying device of an interventional heart valve, which comprises a core tube assembly, wherein a guide head and a fixing head are fixed on the core tube assembly, the guide head is fixed at the far end of the core tube assembly, the fixing head extends out of the near end side of the core tube assembly, and an interventional heart valve installation position is arranged between the guide head and the fixing head; the periphery of the intervention heart valve installation position is provided with an outer sheath tube capable of axially sliding, and a floating limit bar is also arranged, the proximal end of the floating limit bar is a starting end fixedly arranged relative to the fixed head or the core tube assembly, and the floating limit bar floats between the intervention heart valve installation position and the outer sheath tube; the outer wall of the fixed head is provided with a positioning part matched with the connecting lug of the interventional heart valve; when the interventional heart valve is in a loading state, the distal end head of the floating limiting strip is axially overlapped on at least the connecting lug, and when the interventional heart valve is released, the floating limiting strip can swing freely and release radial pressure on the connecting lug along with the withdrawal of the outer sheath tube.

Description

Conveying device of interventional heart valve

The application is a divisional application, the application number of the original application is 201810509256.3, the application date is 2018, 05 month and 24 days, and the invention is a delivery device capable of positioning an interventional heart valve repeatedly.

Technical Field

The present invention relates to the field of medical devices, and more particularly to a delivery device for implanting a prosthetic heart valve into the heart.

Background

Heart valve disease is one of the most common heart diseases, with valve damage caused primarily by rheumatic fever; valve degeneration (including calcification and myxodegeneration, etc.) and metabolic disorder valve damage have also increased in recent years; in addition, congenital valvular disease is also one of the common etiologies of heart disease. High risk cases of considerable heart valve disease, such as severe valve insufficiency, advanced cases of failure to accommodate surgical valve replacement surgery, advanced tumors, and valve insufficiency, require new, less invasive interventional procedures. Interventional heart valves have evolved under the elicitation of surgical heart valve replacement procedures, and percutaneous valve interventions have been developed in recent years and applied successively to humans after 2000. From experimental research to a small-scale clinical parallel research stage, valvular disease intervention may break through a "bottleneck" in technology, rapidly realize wide clinical application, and become a focus of attention in the field of interventional cardiology again.

In the prior art, a prosthetic heart valve stent is compressed and then delivered into a human body through a delivery device, the compressed valve stent is generally elastic, and when the valve stent is in a compressed state, great force is applied to a compression catheter, and the excessive force is difficult to slowly and accurately release the valve stent, so that excessive friction between the valve stent and the inner wall of a blood vessel is often caused.

The chinese patent publication No. CN101953725 discloses a prosthetic heart valve stent, which is composed of an aortic stent, a valve stent, an outflow tract stent and a connecting lug, wherein when a heart valve is compressed into a delivery device, the connecting lug can be clamped into a stent fixing component of the delivery device, and slow release of the valve stent is completed through clamping of the connecting lug and constriction of an outer sheath tube in the valve stent release process. However, the prior art has a small binding force for clamping the valve stent connecting lugs, and the connecting lugs are very easy to pop out of the support fixing assembly of the conveying device in the later period of the valve stent releasing process, so that the valve stent is completely released. In this case, if problems such as positioning deviation are found, the recovery cannot be performed in time, and the replacement can be performed only by a surgical operation.

To overcome the above-mentioned problems of valve stents during implantation in the human body, US5683451 discloses a valve stent controlled release delivery device and method that reduces friction between the valve stent and the delivery catheter by providing a track within the delivery device to reduce the frictional forces caused by elastic expansion of the delivery catheter during delivery and release of the valve prosthesis. However, the problem that the valve stent is suddenly and completely released due to overlarge elastic force in the release process still cannot be solved, and the valve stent after being released in place cannot be adjusted in position or is secondarily positioned, so that the requirement on the control precision during operation is extremely high, and a certain risk exists.

Moreover, the existing outer sheath tube for delivering the interventional heart valve is mostly made of high polymer materials, and the high polymer materials have poor elasticity and strength although good property. At present, a reinforcing material is also used in a polymer material, such as a woven mesh tube or an elastic tube is used for reinforcing, and the polymer material is coated inside and outside the reinforcing tube to form an outer sheath tube, however, the above measures only increase the folding resistance and the pressure resistance of the outer sheath tube, but do not obviously solve the problem that the interventional heart valve is difficult to recover and the sheath folds when the outer sheath is retracted into the interventional heart valve.

Disclosure of Invention

The invention provides a delivery device capable of repeatedly positioning an interventional heart valve, which can fasten the final release end part of a valve support in the release process of the interventional heart valve, prevent the interventional heart valve from suddenly separating from an installation position before confirming release or in the process of further retracting and adjusting the valve position, and simultaneously provide stable axial support and expansion force for an outer sheath tube when the interventional heart valve is recovered so as to realize stable and easy repeated positioning of the interventional heart valve.

The delivery device capable of positioning the interventional heart valve repeatedly comprises a core tube assembly, wherein a guide head and a fixing head are fixed on the core tube assembly, the guide head is fixed at the distal end of the core tube assembly, the fixing head extends out of the proximal end side of the core tube assembly, and an interventional heart valve installation position is arranged between the guide head and the fixing head; an outer sheath tube which can axially slide is arranged at the periphery of the insertion heart valve installation position,

The proximal end of the floating limit bar is a starting end fixedly arranged relative to the fixed head or the core tube assembly, and the floating limit bar floats between the intervention heart valve installation position and the outer sheath tube;

the outer wall of the fixed head is provided with a positioning part which is used for being matched with a connecting lug of an interventional heart valve, and the floating limiting strip is bound by the outer sheath tube to keep the matching between the connecting lug and the positioning part before the connecting lug is completely released out of the outer sheath tube;

the outer sheath tube comprises an inner layer, an intermediate layer and an outer layer from inside to outside, the intermediate layer comprises a first section, a second section and a third section from a far end to a near end, the first section is of a hollow structure, the hollow structure comprises at least two hollow units, and two adjacent hollow units are arranged at the far end of the first section in a circumferential direction in a mutually separated mode.

In the invention, the floating limiting strip is positioned between the outer sheath tube and the interventional heart valve, so that the gap between the outer sheath tube and the connecting lug of the interventional heart valve in the radial direction is effectively filled, the tightening force of the outer sheath tube on the connecting lug in the radial direction is enhanced and strengthened, the stability and firmness of the connection between the connecting lug of the interventional heart valve and the fixed head are enhanced, the connecting lug is prevented from being separated from the fixed head and cannot be controlled before the interventional heart valve is completely released, and in the case of unsatisfactory valve release, a powerful and stable pulling force is provided for the secondary positioning or withdrawal of the interventional valve in the outer sheath tube which can be pulled back again; meanwhile, the inner middle layer of the outer sheath tube not only enhances the axial supporting force of the outer sheath tube, but also can radially expand and reduce the radial contraction of the valve, and reduce the resistance in the retracting process, namely, on one hand, the stable back tension of the valve is ensured, on the other hand, the resistance of the released part of the valve to be recovered into the outer sheath tube is reduced, and the delivery release and the repeatable positioning of the interventional heart valve are effectively and safely realized.

The floating stop can swing freely or only rely on the material strength of itself to maintain the relative position and attitude with respect to the interventional heart valve or core tube assembly when the valve is not loaded or without the sheath being constrained.

Before the interventional heart valve is loaded into the outer sheath tube and is completely released from the outer sheath tube, the floating limiting strips are bound by the outer sheath tube to keep the cooperation between the connecting lugs and the positioning parts; the outer sheath tube is retracted, the floating limiting strip is also gradually released from the outer sheath tube in the process of gradually releasing the connecting lugs, the floating limiting strip can swing freely when the connecting lugs are completely released and are separated from the fixing heads, the released floating limiting strip does not apply radial pressing force to the connecting lugs any more, namely, after the intervention heart valve is determined to be in place well, the outer sheath tube is continuously retracted, the connecting lugs and the floating limiting strip are released, and at the moment, the floating limiting strip released from the outer sheath tube has infinite position effect on the connecting lugs, and secondary interference cannot be caused on the intervention heart valve to cause displacement of the intervention heart valve.

After the interventional heart valve is loaded into the outer sheath tube, the floating limiting strip also plays a role of a gasket, can compensate the fit tolerance between the outer sheath tube and the interventional heart valve connecting lug, fills the gap between the outer sheath tube and the interventional heart valve connecting lug in the radial direction, has a simple structure, and can not increase the radial size of the conveying system when the valve is implanted by filling the gap; the reinforcement of the connection and the coordination between the existing intervention valve and the fixed head is enhanced, and the connection performance is more stable; the radial pressure of the floating limit strips to the connecting lugs synchronously disappears along with the withdrawal of the outer sheath tube, so that no new interference is caused to the released good valve.

In the present invention, an interventional heart valve mounting location is used for mounting an interventional prosthetic heart valve, the length of the interventional heart valve mounting location being adapted to the length of the interventional prosthetic heart valve holder, the interventional heart valve mounting location comprising not only the entire section between the guide head and the fixation head, but also a portion extending from the distal end of the fixation head to the fixation head positioning portion.

Preferably, the starting end of the floating stop is fixed to at least one of the fixed head or the core tube assembly.

The fixed position of the initial end of the floating limit stop is close to the fixed head, for example, is positioned at the tail part of the proximal end (along the direction that the conveying device is close to an operator) of the fixed head or on a core tube assembly connected with the tail part, the interventional heart valve and the floating limit stop are bundled by the outer sheath before operation, so that the floating limit stop is radially and inwards converged to lean against the periphery of the interventional heart valve, and the floating limit stop is radially and outwards tilted along with the withdrawal of the outer sheath and the release of the valve support in the release process after the interventional heart valve reaches the body.

In order to control the axial position of the interventional heart valve, a connecting lug matched with the fixed head is generally arranged at the proximal end of the interventional heart valve, the connecting lug can be in a T shape, an L shape, an annular shape and the like, a positioning groove for receiving the T shape and the L shape can be adopted as a positioning part, or a lug clamped into the annular shape and the like, so that the axial position of the interventional heart valve after the valve is loaded is limited to the positioning part, and the shape of the connecting lug per se can be adopted as the prior art, which is not the important point of improvement of the invention.

Preferably, the positioning part is a positioning convex head, the connecting ear sleeve is arranged on the positioning convex head after the valve is loaded, and the floating limiting strip is overlapped on the connecting ear to keep the cooperation between the connecting ear and the positioning part before the connecting ear is completely released from the outer sheath tube.

Preferably, the positioning part is a positioning groove, the connecting lug is embedded in the corresponding positioning groove after the valve is loaded, and the floating limiting strip is overlapped on the connecting lug before the connecting lug is completely released from the outer sheath tube so as to keep the matching between the connecting lug and the positioning part.

For example, when the positioning groove is adopted, the connecting lug is clamped into the positioning groove when the valve is loaded so as to realize axial positioning, and after the outer sheath tube is withdrawn, the connecting lug is separated from the positioning groove along the radial direction of the bracket.

The positioning groove can be combined with a raised head structure, namely, the raised head is arranged at the bottom of the positioning groove, and the positioning effect can be enhanced by matching with the corresponding shape of the connecting lug.

Preferably, the number of the floating limiting strips is the same as that of the positioning grooves, and the circumferential positions are in one-to-one correspondence.

The locating groove can ensure that the floating limit strip can not deviate in the process of converging and releasing.

The proximal end of the floating limit bar is tightly buckled with the positioning groove and the connecting lug embedded in the positioning groove under the wrapping of the outer sheath tube after the valve is loaded. In the process of withdrawing the outer sheath tube to release the valve stent, the rapid release and falling of the valve stent are prevented through the extrusion fastening action of the floating limiting strips in the positioning grooves. When the positioning deviation is found in the valve stent releasing process, the outer sheath tube can be pushed forward to compress and recover the released valve stent, and at the moment, the connecting lugs are tightly wrapped by the floating limiting strips and the outer sheath tube, so that the safety control and secondary positioning of the valve stent are effectively ensured.

Preferably, the end of the floating limit bar extends at least to a position corresponding to the connecting lug. I.e. at least part of the connecting lug is covered to realize the restraint of the radial movement of the connecting lug, on the basis of which the end of the floating stop can extend further distally.

The end of the floating stop is relative to the beginning and is also understood to be the distal side of the floating stop.

Preferably, the most distal end of the floating stop bar is aligned with or does not exceed or slightly exceeds the most distal end of the fixed head.

When the floating limit strip has the minimum length, the floating limit strip at least can cover the connecting lug. To further ensure the compression effect, the ends of the floating stop strips may extend further to the distal side of the fixation head or slightly beyond the distal side of the fixation head, for example by a length of less than or equal to 1cm. When the floating limiting strip has the maximum length, the whole floating limiting strip can ensure to be converged in the outer sheath tube, the tail end of the floating limiting strip is flush with the far end side of the valve support inside the outer sheath tube, the length of the floating limiting strip can wrap the whole valve support, the floating limiting strip plays a role of a sliding rail, and the outer sheath tube can be pushed forwards and retracted along the sliding rail without directly contacting the valve support.

After the interventional heart valve is loaded, the floating limiting strips are bound by the outer sheath tube bundles to limit the connecting lugs in the positioning grooves, the inner walls of the outer sheath tubes are in contact with the floating limiting strips and provide radial binding, and the connecting lugs can be blocked in the positioning grooves by the floating limiting strips to prevent the connecting lugs from falling out.

Preferably, the positioning groove is axially penetrated, and part or all of the position where the floating limiting strip is matched with the positioning groove is sunk into the positioning groove.

The floating limit bar extends distally through the locating groove, the locating groove is not only axially communicated, but also is open on the radial outer side, namely the floating limit bar is provided with a radial opening, the floating limit bar is not strictly limited to be completely positioned on the inner side of the radial opening, and is allowed to be positioned on the outer side of the radial opening, for example, the cross section of the floating limit bar is T-shaped, the bottom end of the T-shaped is extended into the locating groove for blocking the connecting lug, and the size of the top of the T-shaped is limited by the radial opening, so that the floating limit bar is positioned on the outer side of the radial opening, and only the fit with the inner wall of the outer sheath tube can be ensured, and the fit with the connecting lug can be considered.

Preferably, the axial through area of the positioning groove is closed by a floating limit bar.

In order to prevent the connecting lug from falling out, the width of the floating limit bar can be the same as or slightly wider than the radial opening of the axial through area, so that the radial opening is completely closed, even if the width is smaller than the width of the radial opening, the gap of the floating limit bar is at least not so far as to fall out of the connecting lug, and the width of the floating limit bar is preferably the same as the radial opening of the axial through area, so that the floating limit bar can be further prevented from shifting.

Preferably, the floating limiting strip is sunk into the part of the positioning groove and is contacted with or abutted against the connecting lug inwards in the radial direction.

The thickness (radial dimension) of the floating limit strip and the depth of the positioning groove can have different matching relations although the floating limit strip can block the connecting lug, under the condition that the outer sheath tube is coated and contacted with the periphery of the fixed head, the floating limit strip is overlapped on the outer wall of the connecting lug, if the sum of the thickness of the floating limit strip and the thickness of the connecting lug is larger than the depth of the positioning groove, the floating limit strip is contacted with the connecting lug in a radial inward manner, no obvious tightening force is generated, but the floating limit strip and the limit of the connecting lug can be ensured, and as further preferable, the abutting relation is adopted, the limit can be ensured to be still maintained when the axial force is overlarge or the outer sheath tube is locally deformed.

Preferably, after valve loading, the floating stop is radially at the same height as or higher than the outer wall of the fixed head.

The floating limit strip is not lower than the outer wall of the fixed head in the radial direction, so that unnecessary gaps can be avoided between the floating limit strip and the inner wall of the outer sheath tube, the inner wall of the outer sheath tube is tightly attached to the floating limit strip, and the connecting lugs are tightly pressed in the positioning part of the fixed head.

Optionally, the position where the floating limit bar is matched with the connecting lug extends along a straight line or a curve.

When the two sides of the floating limit bar are propped against the corresponding sides of the positioning groove, the width of the floating limit bar can be properly narrowed when the floating limit bar extends along a curve, and the floating limit bar is easier to bend and turn outwards to release the connecting lugs when the interventional heart valve is released, so that the hysteresis of the falling-out of the connecting lugs is avoided.

Optionally, the floating limit strips and the connecting lugs are extended at the same width or different widths at the matched positions.

Optionally, the floating limit strips and the connecting lugs are extended at the matched parts with equal thickness or unequal thickness. The part of the floating limit strip matched with the connecting lug extends along a straight line or a curve, the floating limit strip can be set to be unequal in width and/or unequal in thickness, and the local strength is adjusted through the change of the width and the thickness, so that both limit and release of the connecting lug are considered.

Preferably, the end of the floating limit bar has a smooth outer circumferential surface.

The floating limiting strips are radially unfolded along with the release of the valve stent in the use process, and in order to prevent the unfolded tail ends from stabbing the inner wall of the blood vessel, the tail ends adopt smooth outer contours, for example, the tail ends are similar to spherical crowns or edge rounding angles and the like.

Preferably, the floating limit strips are uniformly distributed with 2, 3 or 4 floating limit strips along the circumferential direction.

Preferably, the floating stop bars are equal or unequal in length.

When the lengths are different, the end positions of the floating limiting bars can be different, for example, the end of at least one floating limiting bar extends to be flush with the distal end side of the fixed head; at least one floating stop extends distally of the insertion heart valve mounting site.

Preferably, the floating limit bars are 3 bars with equal length and are all of strip structures.

Preferably, the floating limiting bar is of a hollow or solid structure.

Preferably, the floating limiting bar is in a solid flat bar shape.

The flat strip structure is adopted, so that the radial occupied space of the insertion heart valve installation position is small, and the compressed outer diameter is reduced.

Preferably, the size of the floating limit bar is as follows: the length is 10mm-80mm, the width is 1-2mm, and the thickness is 0.2-0.5mm.

Preferably, the floating limiting strips are fixed on the connected components in an adhesive, binding, locking, welding or integrated mode.

One end of the floating limiting strip is a starting end, the other end of the floating limiting strip is a tail end, the middle part of the floating limiting strip is an extension section, and the starting end is positioned at the tail part of the near end of the fixed head or the connection part of the tail part and the inner sheath tube and is fixed on the connected parts in an adhesive, binding, locking, welding or integrated mode. The floating limiting bar extends along the starting end to the far end, the starting end of the floating limiting bar is fixed in a natural state, and the extending section and the tail end are axially unfolded along the core tube assembly.

Optionally, after loading the interventional heart valve, the floating stop strip distal head axially at least partially overlies the connector lug.

Optionally, the distal end of the floating limiting bar axially overlaps the connecting lug and the fixed head.

Optionally, the floating limiting strip distal end head axially overlaps the connecting lug and the whole fixed head.

Optionally, the floating stop distal tip exceeds the distal end of the fixed head to a site of maximum diameter of the interventional heart valve.

Preferably, at least one of the position where the floating limiting bar is matched with the outer sheath tube and the position where the floating limiting bar is matched with the bracket is provided with a smooth surface and/or is provided with a lubricating coating.

Preferably, the floating limiting strips are made of polytetrafluoroethylene materials.

Preferably, a fixed guide strip is also arranged on the inner wall of the outer sheath tube and extends along the axial direction.

One surface of the fixed guide strip is fixed inside the tubular shell at the distal end of the outer sheath (along the direction of the conveying device away from an operator), and the fixed guide strip is arranged along the axial extension of the tubular shell. In the process of the outer sheath tube converging and releasing the valve stent, the valve stent is in direct contact with a fixed guide strip positioned in a tubular shell of the outer sheath tube, and the valve stent is rapidly and accurately regulated and controlled through a smooth track provided by the fixed guide strip.

The fixed guide strip and the inner wall of the outer sheath tube can be in contact part or all fixed connection, or a plurality of fixed points distributed at intervals are adopted, and as the fixed guide strip needs to reciprocate along with the outer sheath tube, the fixed guide strip is preferable that the two axial ends of the fixed guide strip are at least fixed with the inner wall of the outer sheath tube, so that the space interference caused by tilting is avoided.

The preoperative sheath tube bundles the valve bracket, and the fixed guide strip is tightly attached to the valve bracket. In a subsequent release of the valve stent, the fixation guide strip provides a smooth track between the outer sheath tubular housing and the valve stent (the side near the valve stent), reducing contact friction, facilitating release and control of the valve stent.

In the present invention, a "floating" guide bar is relatively to a "fixed" guide bar, and "floating" means that one end is fixed, and the other end can swing at least in the radial direction without external constraint, and circumferential deflection is generally allowed due to the limitation of the strength of the material of the guide bar.

Preferably, the floating limiting strips and the fixed guide strips are alternately arranged along the circumference.

The distribution of each fixed guide strip and the positioning groove on the fixed head are staggered, which means that the fixed guide strips and the floating limit strips are staggered.

Preferably, the ends of the floating limit bars are arranged at the same axial position or staggered with the axial position of the distal end side of the fixed guide bar.

Preferably, the fixed guide strips are uniformly distributed with 2, 3 or 4 fixed guide strips along the circumferential direction.

Preferably, the fixed guide bars are equal or unequal in length.

Preferably, the fixed guide strips are 3 equal in length and are all of strip-shaped structures.

Preferably, the fixed guide strip is of a hollow or solid structure.

Preferably, the fixing guide bar is a solid flat bar.

Preferably, the fixed guide bar has the following dimensions: the length is 10mm-80mm, the width is 1-2mm, and the thickness is 0.2-0.5mm.

Preferably, the length of the fixed guide strip is 60mm-80mm.

In the invention, the shapes and the sizes of the floating limiting strips and the fixed guide strips are mutually independent, and can be of a strip solid or hollow structure; the cross-sectional shape is preferably flat, and the thickness direction of the flat shape, i.e., the radial direction of the outer sheath, is used to reduce the radial dimension of the entire distal end of the outer sheath.

In order to facilitate the release and recovery of the control bracket and reduce the contact area with the outer sheath tube, thereby reducing the relative friction between the two, and the floating limiting strip and the fixed guide strip are correspondingly selected with proper sizes.

Preferably, the fixing guide strip fixes the inner wall of the outer sheath tube in an adhesive, binding, locking, welding or integrated mode.

Preferably, the parts of the fixing guide strips matched with the interventional heart valve are provided with smooth surfaces and/or lubrication coatings.

Preferably, the fixing guide strip is made of polytetrafluoroethylene material.

In the invention, the materials of the floating limiting strip and the fixed guide strip can be selected independently, and the floating limiting strip and the fixed guide strip are preferably made of biocompatible materials with better elasticity, and the specific materials can be selected by adopting the prior art.

To ensure proper elasticity and minimum dynamic friction factor of the floating limit bar and the fixed guide bar, the sliding rail material is preferably Polytetrafluoroethylene (PTFE). After the valve stent is released in a human body, the sliding rail is retracted along with the conveying system, the sliding rail is in contact friction with the completely released valve stent in the retraction process of the sliding rail, in order to prevent the elastic force between the sliding rail and the valve stent from moving the stent in the retraction process of the sliding rail, more preferably, the outer surface of the floating limiting strip or the fixed guide strip is as smooth as possible or is provided with a lubricating coating layer, and the lubricating coating layer material can be hydrophilic monomer or high molecular polymer with lubricating property, such as N, N-Dimethylacryloyl (DMAA), acrylamide (AAm), N-vinyl pyrrolidone (NVP), polyvinyl alcohol (PVA), polyacrylamide (PAAm), polyethylene glycol (PEG) and the like, and the coating layer material is attached to the outer surface of the floating limiting strip or the fixed guide strip through a coupling agent or a chemical method.

In the outer sheath, the inner layer, the middle layer and the outer layer are sequentially distributed from inside to outside along the radial direction of the outer sheath, and the first section, the second section and the third section are sequentially distributed from the distal end of the outer sheath to the proximal end of the outer sheath.

The hollowed-out units on the first section are separated from each other in the circumferential direction of the distal end of the first section. The first section can be expanded in compliance with the inner layer and the outer layer, so that the distal end of the outer sheath tube has better expandability and simultaneously has enough axial and radial supporting force, and the hollowed-out unit is in a furled state, so that enough axial and radial supporting force is further provided. Thereby providing sufficient axial and radial support force during the retrieval of the interventional heart valve to enable the rapid and safe retrieval of the interventional heart valve.

In one embodiment, two adjacent hollow units are provided with hollow gaps between the circumferential distal ends of the first sections, and the range of the hollow gaps L is between 0.5mm and 8 mm.

In one embodiment, an axially non-closed space is formed between two adjacent hollow units.

In one embodiment, the hollow units in the circumferential direction of the first section form a plurality of hollow unit groups, and two adjacent hollow unit groups are separated from each other in the circumferential direction of the first section.

In one embodiment, two adjacent hollow units are separated from each other at the distal end of the first section in the circumferential direction, are connected to each other at the proximal end of the first section in the circumferential direction or are independent from each other, and are connected to the second section.

In one embodiment, the hollow unit is provided with at least one hollow hole, and the hollow hole extends from the far end to the near end along the axial direction of the hollow unit.

In one embodiment, the hollow unit includes at least one hollow section, and at least one hollow hole is formed in the hollow section.

In one embodiment, the area of the hollowed-out hole accounts for 40-80% of the area of the hollowed-out unit.

In one embodiment, the area of the hollowed-out hole accounts for 60-70% of the area of the hollowed-out unit.

In one embodiment, the distal end of the hollow unit is provided with an arc section, and the arc direction of the arc section is convex to the distal end of the hollow unit.

In one embodiment, the radius of the arc segment ranges from 0.3mm to 16mm.

The invention also provides an outer sheath, which comprises a conveying catheter, a transition pipe and an outer sheath pipe, wherein the conveying catheter, the transition pipe and the outer sheath pipe are sequentially connected from the distal end to the proximal end of the outer sheath, and the axis of the conveying catheter, the axis of the transition pipe and the axis of the outer sheath pipe are overlapped.

The invention also provides an interventional heart valve conveying device which is used for conveying an interventional heart valve and comprises a core tube assembly, an outer sheath and an operating handle, wherein the core tube assembly is connected with the operating handle, the outer sheath is sleeved on the core tube assembly in a sliding mode, and the interventional heart valve is loaded on the core tube assembly and contained in an outer sheath tube of the outer sheath.

Compared with the prior art, the outer sheath tube, the outer sheath with the outer sheath tube and the interventional heart valve conveying device are mutually separated in the circumferential direction of the far end of the first section due to the hollow-out units on the first section. The first section can be expanded in compliance with the inner layer and the outer layer, so that the distal end of the outer sheath tube has better expandability and simultaneously has enough axial and radial supporting force, and the hollowed-out unit is in a furled state, so that enough axial and radial supporting force is further provided. Thereby providing sufficient axial and radial support force during the retrieval of the interventional heart valve to enable the rapid and safe retrieval of the interventional heart valve. The floating limit strips are adopted to reduce the contact area of the outer sheath tube and the interventional heart valve to a certain extent, the floating limit strips are also used as smooth tracks, the relative friction force during two-by-two contact is reduced, and the direct acting force during the operation of a doctor can be reduced through the contact with the floating limit strips in the forward pushing and retracting processes of the outer sheath tube, so that the release and recovery of the valve stent are accurately controlled. Further, the valve support can be combined with a fixed guide strip, and the fixed guide strip is clung to the valve support. In a subsequent release of the valve stent, the fixation guide strip provides a smooth track between the outer sheath tubular housing and the valve stent, reducing contact friction, facilitating release and control of the valve stent.

Drawings

FIG. 1 is a schematic diagram of a conveyor apparatus according to the present invention;

FIG. 2 is a schematic view of the distal portion of the delivery device of the present invention;

FIG. 3 is a schematic view of the latch portion;

FIG. 4 is a schematic view of the structure at the end of the floating stop;

FIG. 5a is a partial release state diagram of an interventional heart valve;

FIG. 5b is a state diagram of the interventional floating stop partially released during release of the heart valve;

FIG. 5c is a state diagram of the interventional heart valve when fully released;

FIG. 6 is a schematic view of a structure using a stop bar;

FIG. 7a is a schematic view of another interventional instrument prior to release;

FIG. 7b is a schematic view of the structure of the interventional instrument of FIG. 7a prior to release (with a portion of the outer sheath removed relative to FIG. 7 a);

FIG. 8 is a schematic view of a structure when a fixed guide bar is also assembled;

FIG. 9 is a schematic cross-sectional view of an outer sheath;

FIG. 10a is a state diagram before the interventional instrument is fully released when assembled with a floating stop and a fixed guide bar;

FIG. 10b is a view of the interventional instrument fully released prior to assembly with the floating stop and fixed guide strips (with portions of the outer sheath removed relative to FIG. 10 a);

FIG. 11a is a schematic view of the mating portion of the connecting ear and the fixing head;

FIG. 11b is a schematic view of the connecting ear of FIG. 11a after being pressed against the floating stop;

FIG. 12a is a schematic view of a mating portion of a connecting ear and a fixing head;

FIGS. 12 b-12 d are schematic views of the connecting ear of FIG. 12a being pressed against different shapes of floating stop;

fig. 13a to 13d are schematic views of another floating limit bar with connecting lugs pressed by different lengths;

fig. 14 is a schematic structural view of a conveying device provided by the present invention;

FIG. 15 is a schematic view of the distal end portion of the delivery device according to the present invention;

FIG. 16 is a schematic view of the structure of an outer sheath according to the present invention;

FIG. 17 is a schematic cross-sectional view of a delivery catheter provided by the present invention;

FIG. 18 is a schematic illustration of an interventional heart valve configuration provided by the present invention;

FIG. 19 is a schematic cross-sectional view of an outer sheath provided by the present invention;

FIG. 20 is a schematic view of a second intermediate layer according to the present invention;

FIG. 21 is a schematic view of a second interlayer according to another embodiment of the present invention;

FIG. 22 is a diagram showing the flare state structure of the second intermediate layer according to the present invention;

FIG. 23 is a schematic view of the distal structure of a second intermediate layer provided by the present invention;

FIG. 24 is an enlarged view of the structure at E in FIG. 21 according to the present invention;

FIG. 25 is an enlarged view of the structure shown at F in FIG. 24, in accordance with the present invention;

FIG. 26 is a schematic view of another embodiment of the present invention for providing a distal end of the second intermediate layer.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The proximal end is referred to herein as the end of the delivery device in the direction toward the operator and the distal end is the end of the delivery device in the direction away from the operator, and in the example embodiment the heart valve is exemplified by a valve stent.

Referring to fig. 1, the inventive delivery apparatus comprises a guide head 2, a core tube assembly 7, a floating stop 1, a fixed head 3, an inner sheath 4, an outer sheath 5 and an operating handle 6.

The guide head 2 and the fixing head 3 are both fixed on the core tube assembly 7, wherein the guide head 2 is positioned at the most distal end of the core tube assembly 7, the fixing head 3 is sleeved on the distal side of the core tube assembly 7, and an intervention heart valve installation position is arranged between the guide head 2 and the fixing head 3; the outer sheath tube 5 is arranged at the periphery of the intervention heart valve installation position and can axially slide, the core tube assembly 7 and the proximal end of the outer sheath tube 5 are connected with the operating handle 6, the axial sliding of the outer sheath tube 5 relative to the core tube assembly 7 can be realized through the operating handle 6, in addition, the inner sheath tube 4 can be arranged according to the requirement and can be omitted, the inner sheath tube 4 is sleeved on the core tube assembly 7 and is positioned at the proximal end side of the fixed head 3, the inner sheath tube 4 does not generally axially move along with the outer sheath tube 5, and when the core tube assembly is made of stainless steel, the inner sheath tube can also be regarded as a film coating layer of a film coating on the outer surface of the core tube assembly 7.

The core tube assembly 7 can be a single part or can be formed by fixedly connecting two sections in a plugging manner, and the plugging position is preferably positioned in the fixing head 3 so as to ensure the connection strength and the smoothness of the appearance.

In fig. 1, three floating limiting strips 1 are equal in length, are sequentially distributed in the circumferential direction, and are naturally stretched in a released state without being bound by an outer sheath 5.

Referring to fig. 2, the floating stop 1 may be divided into a start 103, an extension 102 and a tail 101 according to the location, where the start 103 is fixed to the core tube assembly 7 and located on the proximal side of the fixed head tail 32, which is shown between the inner sheath 4 and the fixed head tail 32. It is of course also possible to provide the start end 103 on the core tube assembly 7, such as on the core tube assembly 7 between the proximal side of the stationary head-tail 32 and the distal side of the inner sheath 4. The periphery of the fixing head 3 is provided with positioning grooves, and as the positioning grooves are matched with the connecting lugs of the interventional heart valve, the positions and the shapes of the positioning grooves can be matched with the connecting lugs, three positioning grooves are arranged in an axial position staggered mode in the figure, for example, the positioning grooves 31 and the positioning grooves 33 in the figure, in order not to block the extension of the floating limiting strip 1, the positioning grooves adopt an axial through structure, and when the valve support is released, the connecting lugs are radially expanded outwards to be separated from the positioning grooves, so that the radial outer sides of the positioning grooves are open, namely, the positioning grooves are provided with radial openings.

In the figure, the positioning groove is axially penetrated, the two sides of the positioning groove are provided with extended wing parts to be matched with T-shaped connecting lugs, the floating limiting strip 1 passes through the axial penetration part of the corresponding positioning groove when extending distally, and the floating limiting strip 1 in the figure 2 is in a loading state.

The starting end 103 of the floating limit bar can be fixed in an integrated manner by adopting bonding, binding, locking and welding. The adhesive material is selected from biocompatible anti-corrosion adhesive. Binding materials are binding wires with strong flexibility and corrosion resistance.

The welding may be performed by attaching a latch made of an alloy material to the stationary head-tail or core tube assembly and then by latching the beginning end, for example, see fig. 3, the beginning end 103 of the floating stop 1 is latched in a latch 14 made of stainless steel (306), only a part of the extension 102 is illustrated, and the latch 14 is attached to the stationary head 3 or core tube assembly 7 by welding.

The floating limiting bar 1 is a strip-shaped solid or hollow structure, in this embodiment, a solid flat bar is used, and the end 101 may have an arc-shaped outer edge structure to avoid edges (see fig. 4).

Each floating limit bar 1 has a length of 10mm-80mm, a width of 1-2mm and a thickness of 0.2-0.5mm. When the floating limit bar 1 has the maximum length, the whole floating limit bar 1 can ensure the constriction in the outer sheath tube 5.

In combination with fig. 5a and 5b, in order to ensure that the floating limit bar 1 has a small dynamic friction factor, the floating limit bar 1 is made of polytetrafluoroethylene material; in the figure, each floating limit bar 1 is 15mm long, the width is adaptive to the width of a positioning groove of the fixed head 3, the thickness is 0.5mm, when the floating limit bars 1 are in a converging state, three floating limit bars 1 penetrate through the corresponding positioning groove at the corresponding axial penetrating position and extend towards the far end, the valve support 8 is provided with three T-shaped connecting lugs 81, in order to adapt to the shape of the connecting lugs, the positioning groove is penetrated axially on the basis of the T shape, namely in a cross shape, in order to ensure the limiting effect, the axial penetrating area of the positioning groove is completely closed by the corresponding floating limit bars 1, namely the width of the floating limit bars 1 is adaptive to the width of the axial penetrating area, if the penetrating area does not extend along the same width of the axis, the width of the floating limit bars 1 is at least corresponding to the narrowest part of the penetrating area, so as to ensure that the floating limit bars partially or completely sink into the positioning groove, and the outer side of the floating limit bars 1 can be slightly higher than the outer circumferential surface of the fixed head 3, so as to reduce friction between the outer circumferential surface of the fixed head 3 and the inner wall of the outer sheath tube 5.

When the valve bracket 8 is loaded on the conveying device, the floating limiting strip 1 wraps the valve bracket 8 and is converged in the outer sheath 5 together; during the release of the valve holder 8, as shown in fig. 5a, along the arrow M direction, the outer sheath 5 is retracted along the floating stop 1 (the floating stop is in the outer sheath 5 and is not shown in the figure), and the floating stop 1 is in the working state: when the bracket connecting lug 81 is positioned in the outer sheath tube 5, the floating limiting strip 1 acts on the bracket connecting lug 81 due to the constraint of the outer sheath tube 5, so that the bracket connecting lug 81 is prevented from being ejected. Then, as shown in fig. 5b, as the outer sheath 5 is further retracted along arrow M, the end 101 of the floating limit bar 1 is separated from the constraint of the outer sheath 5, the extension 102 and the stent connecting lugs are still in the outer sheath 5, and at this time, the extension 102 acts on the stent connecting lugs 81, giving radial pressure to the connecting lugs 81 of the valve stent, so that the connecting lugs of the valve stent are firmly grasped, overcoming the huge expansion force generated in the self-expansion release process of the stent, and firmly clamped in the positioning groove 33 of the stent fixing head 3, so as to avoid the risk of complete release of the stent from the positioning part of the fixing head. If the valve release position is found to be inaccurate, the outer sheath tube 5 can be advanced, so that the valve support 8 is pulled back into the outer sheath tube 5 again for recovery and secondary release. The invention herein can realize recovery and positioning rapidly compared with the prior art, on the one hand, because the outer sheath 5 (regarding the structure of the outer sheath 5, see the description below) has enhanced axial supporting force, the radial expansion and the reduction promote the radial contraction of the valve stent, and on the other hand, because the floating limiting strip 1 plays the role of a gasket, the resistance when the outer sheath slides forward can be greatly reduced, so that the outer sheath 5 rapidly moves forward to compress the valve stent.

Finally, when the current release position is determined to be accurate, as shown in fig. 5c, the outer sheath 5 is continuously retracted along arrow M, the tail end 101 and the extension section 102 of the floating limit bar 1 are not limited by the outer sheath 5, the tail end 101 and the extension section 102 of the floating limit bar 1 are unfolded along with the unfolding of the valve stent 8, at this time, the floating limit bar 1 is in a non-working state, that is, no acting force is applied to the connecting lugs 81, so that the release of the valve stent 8 is completed, and when the valve stent is completely released, the radial pressure of the floating limit bar to the connecting lugs synchronously disappears along with the retraction of the outer sheath 5, new interference is not caused to the released good valve stent, and the displacement of the valve stent can be effectively prevented.

The floating limit strip 1 applies a force to the connecting lugs of the support, on one hand, the binding force is from the outer sheath tube, on the other hand, the initial end 103 of the floating limit strip 1 is fixed close to the fixing head 3, the extension section 102 close to the initial end 101 is subjected to the binding force of the initial end 103, when the connecting lugs of the valve support 8 are embedded into the positioning grooves 33 of the fixing head 3, the proximal extension section of the floating limit strip 1 clings to the positioning grooves 33, and radial inward pressure is given to the connecting lugs of the valve support 8, so that the valve support 8 can be prevented from being suddenly released due to the fact that the connecting lugs of the valve support 8 are separated from the positioning grooves 33 prematurely in the release process, and meanwhile, in the release process of the valve support 8, if the problem of positioning deviation and the like is found to be needed to be replaced, the binding force given to the connecting lugs of the positioning grooves 33 by the proximal end of the floating limit strip 1 can ensure that the outer sheath tube 5 is pushed forwards along the floating limit strip 1, the released partial valve support 8 is contracted, and the valve support 8 is recovered.

Referring to fig. 6, in other embodiments, the floating stop bar 1 is of a short axial length and terminates flush with the distal end of the fixed head 3.

The floating limit bar 1 provides smooth tracks between the connecting lugs of the valve support 8 and the outer sheath tube 5 and between the outer sheath tube 5 and the fixed head 3, relative friction force is reduced when the outer sheath tube 5 is in contact with each other, direct acting force during operation of a doctor can be reduced through contact with the floating limit bar 1 in the forward pushing and retracting processes of the outer sheath tube 5, and accordingly accurate control on release and recovery of the valve support 8 is achieved.

In fig. 6, the floating limiting strip 1 is three solid long strips and made of polytetrafluoroethylene materials, the initial end of the floating limiting strip 1 is fixed at the tail part of the proximal end of the fixed head 3 in an adhesive manner, the tail end of the floating limiting strip 1 is flush with the distal end of the fixed head 3, namely, at least the connecting lug part can be completely covered and limited in the positioning groove, the width of the floating limiting strip 1 is consistent with the width of the axial through region of the positioning groove 33, and the thickness is 0.5mm.

In connection with fig. 7a,7b, fig. 7a shows a schematic view of the valve holder before complete release, in fig. 7b, the connection lugs 81 of the valve holder 8 and the floating stop 1 are shown for clarity, and in fig. 7b, parts of the outer sheath 5 outside the floating stop 1 and the fixation head 3 are omitted. In this embodiment, the valve holder 8 has a connecting lug 81, and when the valve holder 8 is loaded onto the delivery device, the floating stop 1 extends a length comparable to the distal position of the fixed head 3, and its end can only press against the connecting lug embedded inside the fixed head positioning groove 33. When the valve stent 8 is delivered to the human body and released, the outer sheath 5 is withdrawn and the valve stent 8 is gradually released. At this time, the connecting lugs 81 of the valve support 8 are embedded into the positioning grooves 33 of the fixed head, and the connecting lugs are firmly restrained in the positioning grooves 33 under the action of the restraining force of the starting end of the floating limiting strip 1, so that the premature complete release of the support due to the outward expansion force applied to the connecting lug ends by the released valve support 8 is avoided.

The use of a floating stop 1 of a shorter dimension avoids the influence and unnecessary binding of the normal release of the stent, and the length of the floating stop 1 can also extend to a central region in the axial direction of the valve stent 8, for example not beyond the maximum axial dimension of the valve when fully released, for example point a in fig. 5 c.

Referring to fig. 8 and 9, in other embodiments, the distal inner wall of the outer sheath 5 is further provided with a fixed guide strip 51.

In the figure, except for the floating limiting bar 1, the guide head 2, the fixing head 3, the inner sheath tube 4, the outer sheath tube 5 and the valve support 8, the inner wall of the outer sheath tube 5 is also provided with fixing guide bars 51, the fixing guide bars 51 are three equal-length bars, are uniformly distributed along the circumferential direction and are fixed on the inner surface of the tubular shell at the far end of the outer sheath tube 5, and a smooth track is provided between the valve support 8 and the outer sheath tube 5.

The circumferential positions of the fixing guide strips 51 are staggered with the positioning grooves (namely, the circumferential distribution of the floating limit strips 1) on the fixing head 3, and when the outer sheath 5 bundles the valve support 8, the proximal ends of the fixing guide strips are abutted against the fixing head 3, and the positions of the fixing guide strips are staggered with the positioning grooves one by one.

The fixing guide strip 51 is a solid flat strip with a length of 10mm-80mm, a width of 1-2mm and a thickness of 0.2-0.5mm, and in this embodiment the length of the fixing guide strip 51 corresponds to about 60mm of the axial length of the valve holder 8.

The fixing guide strip 51 fixes the inner wall of the outer sheath tube 5 in an adhesive, binding, locking, welding or integrated mode, the fixing guide strip 51 is made of polytetrafluoroethylene material, and the part matched with the interventional heart valve 8 is provided with a smooth surface and/or a lubricating coating. In the most preferred embodiment, the fixing guide strip 51 is integrally formed with the inner wall of the outer sheath 5, and the fixing guide strip 51 is a convex rib protruding into the outer sheath 5, has a smooth surface and/or has a lubricating coating.

Referring to fig. 10a, 10b, fig. 10a shows a released state of the interventional instrument when the floating stop and the fixed guide are assembled, and a portion of the outer sheath 5 outside the floating stop 1 and the fixed head 3 is omitted in fig. 10b for clarity of illustration between the connecting lugs 81 of the valve holder 8 and the floating stop 1. When the valve stent 8 is released, the outer sheath tube 5 is contacted and slid with the valve stent 8 through the fixed guide strip 51, and the outer sheath tube 5 can be retracted under the condition of small friction force to realize gradual release of the stent.

When the outer sheath 5 is retracted to the position of the fixed head 3, only the connecting lugs of the valve holder 8 are retracted within the outer sheath 5. At this time, the fixing guide strip 51 is completely separated from the valve support 8, and the floating limit strip 1 is tightly pressed on the connecting lugs through the constriction of the outer sheath tube 5. And the outer sheath tube 5 is continuously retracted, the binding force of the floating limit strip 1 to the connecting lugs is gradually reduced, and the connecting lugs are gradually released. In summary, the valve stent 8 is released gradually by the smooth track and radially inward compressive force provided by the fixed guide strips 51, the floating stop strips 1.

In other embodiments, one part of the floating limiting strip is arranged on/in the positioning groove of the fixing head to limit the radial outward expansion of the fixing lug of the bracket to be separated from the positioning groove, and the other part of the floating limiting strip is arranged on the peripheral wall of the fixing head to act as a sliding rail, so that the sheath tube slides along the floating limiting strip. In the best mode, the most distal end of the floating limiting bar corresponding to the positioning groove is aligned with the most distal end of the fixed head or not more than the most distal end of the fixed head or slightly more than the most distal end of the fixed head.

The following embodiments are mainly directed to the length and shape of the floating stop and the matching manner of the connecting lug and the fixed head, and at least one of the foregoing embodiments may be adopted or combined with other components.

Referring to fig. 11a and 11b, the connection lug 81 is T-shaped, the positioning portion on the fixing head 3 is a positioning groove 33, after the valve is loaded, the connection lug 81 is embedded in the positioning groove 33 with a corresponding shape, the floating limit bar 1 is pressed on the connection lug 81 under the constraint of the outer sheath tube, so as to prevent the connection lug 81 from falling out of the positioning groove 33, and in the stent releasing process, the limit of the connection lug 81 is released when the outer sheath tube is completely separated from the floating limit bar 1.

Referring to fig. 12a to 12d, the connection lug 81 is U-shaped, one side of the U-shaped opening is connected with the bracket, the U-shaped opening is closed, the positioning part on the fixing head 3 is the positioning raised head 34, the connection lug 81 is hung on the positioning raised head 34 by using a U-shaped structure, axial positioning can be realized, in order to avoid the connection lug 81 from protruding too radially, a settling tank 35 is arranged on the outer periphery of the positioning raised head 34, namely the outer wall of the fixing head 3, the connection lug 81 is overlapped in the settling tank 35, and the same height as the outer wall of the fixing head 3 in the radial direction can be realized.

In fig. 12b, the floating stop 1 has a bifurcated structure, i.e. a U-shape, and the non-bifurcated portion is fixed to the outside of the fixing head 3, and the bifurcated portion extends distally until it is overlapped on the outside of the connecting lug 81.

In fig. 12c, the floating stop 1 is a single strip-like structure, and likewise extends distally until it overlaps the outside of the connecting lug 81.

In fig. 12d, the floating limiting bar 1 is a bifurcation mechanism, but adopts a V shape or a Y shape, an unfurled part is fixed outside the fixing head 3, and the bifurcation part extends distally until being overlapped outside the connecting lug 81.

Referring to fig. 13a to 13d, there are shown schematic structural diagrams of the floating stop 1 with the connecting lugs compressed to different lengths. When the heart valve is in the loading state, the outer sheath tube 5 restrains the floating limit bar 1, the connecting lug 81 is positioned outside the fixing head, the positioning part on the fixing head takes the mode of positioning the convex head 34 as an example, and the distal end side of the floating limit bar 1 is at least partially overlapped on the connecting lug 81.

Fig. 13a shows that the distal side of the floating distance limiter 1 is pressed onto the connecting lug 81, the distal side of the floating distance limiter 1 not yet extending to the positioning projection 34, only a small area of the connecting lug 81 being pressed.

Fig. 13b shows that the distal end side of the floating stop bar 1 is folded over the connecting lug 81, and that the distal end side of the floating stop bar 1 axially covers at least the positioning portion of the fixing head completely, i.e. over the positioning projection 34, to the distal end side of the fixing head 3, and that the connecting lug 81 and the entire fixing head 3 are folded axially towards the distal end side.

Fig. 13c shows the distal side of the floating stop 1 overlying the connecting lug 81, the distal side of the floating stop 1 axially passing over the fixed head.

Fig. 13d shows that the distal side of the floating stop bar 1 is folded over the connecting lug 81, the distal side of the floating stop bar 1 axially passes over the fixing head to reach the position of maximum diameter of the interventional heart valve, and after the valve is loaded, the outer diameter of the interventional heart valve is basically consistent due to the binding of the outer sheath tube, so the position of maximum diameter can be understood as the position of maximum diameter in the released state.

The embodiments below are described primarily with respect to improvements to the outer sheath, and the floating stop or other components may be employed with or in combination with at least one of the foregoing embodiments.

Referring to fig. 14 and 18, the delivery device 100 is used to deliver the interventional heart valve 82 to a corresponding location in the human body. The interventional heart valve 82 may be a valve stent or a stent of the type.

The conveying device 100 comprises a core tube assembly 10, an outer sheath 20 and an operating handle 30, wherein the core tube assembly 10 is connected with the operating handle 30, the outer sheath 20 is slidably sleeved on the core tube assembly 10, and the outer sheath 20 is positioned between the core tube assembly 10 and the operating handle 30. The interventional heart valve 82 is carried on the core tube assembly 10 and is housed within the outer sheath 20. The operating handle 30 is used to control the axial advancement or retraction of the core tube assembly 10 relative to the outer sheath 20 to release or retract the interventional heart valve 82.

The core tube assembly 10 comprises a core tube 11, a guide head 12. The proximal end of the core tube 11 is connected to the operating handle 30, and the distal end of the core tube 11 is penetrated from the outer sheath 20 and connected to the guide head 12. Here, it should be construed that the proximal end is opposite to the distal end, specifically, the proximal end refers to an end in a direction of the delivery device 100 close to an operator, and the distal end refers to an end in a direction of the delivery device 100 away from the operator.

Referring to fig. 15, the core tube 11 includes a middle tube 111 and a loading section 112. The proximal end of the middle tube 111 is connected to the operating handle 30, and a fixed head 1111 and a floating limit 1112 are provided on the distal end of the middle tube 111. The fixation head 1111 is used for the intervention heart valve 82 to mate to fix the intervention heart valve 82. The loading section 112 is located between the fixation head 1111 and the guide head 12, the proximal end of the loading section 112 is fixed on the fixation head 1111, the distal end of the loading section 112 is connected to the guide head 12, the loading section 112 is located in the outer sheath 20, and the loading section 112 is used for loading the interventional heart valve 82.

Further, the length of the floating limiting bar in the axial direction of the core tube 11 is greater than the length of the fixing head 1111 in the axial direction of the core tube 11.

The floating stop 1112 may be integrally secured to the middle tube 111 by bonding, binding, locking, welding. The floating limit bars 1112 reduce the contact area between the sheath 20 and the interventional heart valve 82 to a certain extent, and also serve as smooth rails to reduce the relative friction force between the sheath 20 and the interventional heart valve 82, and the direct acting force during the operation of a doctor can be reduced through the contact with the floating limit bars 1112 in the axial forward or retracting process of the core tube 11 relative to the sheath 20, so that the release and recovery of the interventional heart valve 82 can be accurately controlled.

Referring to fig. 16, the outer sheath 20 is generally formed in a tubular structure, and the outer sheath 20 has a certain flexibility, axial supporting force, and radial supporting force. Comprises a delivery catheter 21, a transition tube 22 and an outer sheath tube 23, wherein the proximal end of the delivery catheter 21 is connected with the operating handle 30, and the distal end of the delivery catheter 21 is connected with the outer sheath tube 23. The interior of the delivery catheter 21 is disposed in communication with the interior of the outer sheath 23. The transition pipe 22 is arranged between the delivery catheter 21 and the outer sheath pipe 23, and the delivery catheter 21 and the outer sheath pipe 23 are connected with each other through the transition pipe 22. The core tube 11 passes through the delivery catheter 21, the transition tube 22 and the outer sheath tube 23 in sequence.

The strength of the distal end of the delivery catheter 21 increases in the direction from the delivery catheter 21 to the outer sheath 23. Thereby the conveying conduit 21 has certain flexibility and axial supporting force, and the conveying conduit 21 can meet different implantation points. The diameter of the delivery catheter 21 is smaller than the diameter of the outer sheath 23.

Referring to fig. 17, the delivery catheter 21 includes a three-layer structure. Specifically, the delivery catheter 21 includes a first inner layer 211, a first intermediate layer 212, and a first outer layer 213, which are sequentially disposed from inside to outside in the radial direction of the delivery catheter 21. Various bonding means may be used among the first inner layer 211, the first outer layer 213, and the first intermediate layer 212. For example, the first inner layer 211, the first outer layer 213 and the first intermediate layer 212 are connected by thermal fusion or adhesive; or the first inner layer 211 and the first outer layer 213 are connected with the first middle layer 212 through a dipping or spraying coating mode. The first inner layer 211 and the first outer layer 213 may be made of the same or different polymer materials, so that the conveying pipe 21 has a certain flexibility, a sufficient axial supporting force, and a sliding property. Thus, even during implantation of the interventional heart valve 82, a tortuous implantation site exists (e.g., when bending along the aortic arch of an animal) to enable accurate implantation. The first inner layer 211 may be made of a polymer material such as PTFE (Polytetrafluoroethylene), PEBAX (Polyeher block amide, polyether block amide), and the first outer layer 213 may be made of a material such as PTFE, PU (Polyurethane), PEBAX (alcanide elastomer), or PE (polyethylene). In this embodiment, the first inner layer 211 and the first outer layer 213 are made of a lubricating elastomer made of the same polymer material, including PTFE (Polytetrafluoroethylene) or PEBAX (Polyeher block amide, polyether block amide).

The first intermediate layer 212 is made of metal braid or cut from metal tube, so that the delivery catheter 21 can maintain a certain axial supporting force while having a certain flexibility. Preferably, the first intermediate layer 212 is cut from a metal tube.

A transition tube 22 is used to connect the delivery catheter 21 to the outer sheath 23. Further, the cross section of the transition pipe 22 is trapezoidal. The structure of the transition tube 22 is the same as that of the outer sheath tube 23.

After valve loading, the loading section 112 is received within the outer sheath 23, the outer sheath 23 being configured to receive the interventional instrument 82. Prior to releasing the interventional instrument 82, the interventional instrument 82 is compressed in an ice-water mixture to be received within the outer sheath 23. Here, it should be explained that, referring to fig. 18, the interventional instrument 82 includes a stent 83 and a valve that is artificially sewn to the stent 83. The bracket 83 is a nickel-titanium alloy bracket, and the valve is made of biological materials such as pig pericardium, bovine pericardium and the like. The nitinol stent has a shape memory function, is soft in an ice-water mixture, is easily compressed and folded inside the outer sheath 23, and can expand and recover its expanded shape when released in blood.

During the release process, the operating handle 30 is operated to enable the outer sheath 23 to axially move relative to the core tube 11, the interventional instrument 82 is released, during the process, once the release position of the interventional instrument 82 is found to be incorrect, the operating handle 30 is operated to enable the outer sheath 23 to advance relative to the mandrel, the portion of the distal end of the outer sheath 23 gradually wraps the interventional instrument 82, and under the action of the binding force (circumferential expansion resistance) of the outer sheath 23, the interventional instrument 82 is compressed and recovered into the outer sheath 23.

Referring to fig. 19, the axis of the sheath tube 23 is coincident with the axis of the delivery catheter 21 and the axis of the transition tube 22. The outer sheath 23 includes a three-layer structure. Specifically, the outer sheath 23 includes a second inner layer 23a, a second intermediate layer 23b, and a second outer layer 23c, which are disposed in this order from inside to outside in the radial direction of the outer sheath 23. Various bonding methods may be used among the second inner layer 23a, the second intermediate layer 23b, and the second outer layer 23c. For example, the second inner layer 23a and the second outer layer 23c are connected to the second intermediate layer 23b by thermal fusion or adhesive. The second inner layer 23a and the second outer layer 23c may be made of the same or different polymer materials, so that the sheath tube 23 has a certain flexibility, a sufficient axial supporting force, and a sliding property. The second inner layer 23a may be made of a polymer material such as PTFE (Polytetrafluoroethylene), and the second outer layer 23c may be made of a material such as PTFE, PU (Polyurethane), pebax (alchemy nylon elastomer), or PE (polyethylene). In the present embodiment, the second inner layer 23a and the second outer layer 23c are made of a lubricating elastomer made of the same polymer material, including PTFE (Polytetrafluoroethylene).

Referring to fig. 20 and 21, the second intermediate layer 23b is a reinforcing layer, and may be formed by cutting a stainless steel tube or a nickel-titanium alloy tube, or may be formed by cutting a nickel-titanium alloy tube in the first section, and stainless steel tube in the rest. The second intermediate layer 23b is used to enhance the axial support force, radial support force, binding force (circumferential expansion resistance) and flexibility of the outer sheath 23, and provides sufficient binding force to compressively house the interventional heart valve 82 in the outer sheath 23 during the retraction of the interventional heart valve 82. Second, the axial supporting force and flexibility provided by the second intermediate layer 23b can enable the outer sheath 23 to have good bending performance, so that different implantation sites of a human body can be satisfied, and implantation of the interventional heart valve 82 is realized.

Specifically, the second intermediate layer 23b includes a first section 231, a second section 232, and a third section 233. The first section 231, the second section 232 and the third section 233 are sequentially connected, the first section 231 is disposed near the distal end of the outer sheath 23, the third section 233 is disposed near the proximal end of the outer sheath 23, and the second section 232 is located in the middle of the first section 231 and the third section 233.

Referring to fig. 20-25, the first section 231 includes a hollowed-out structure, so that the distal end of the outer sheath 23 has sufficient radial elastic force and axial supporting force. The hollow structure is in a furled state along the radial direction of the outer sheath 23. The hollowed-out part of the hollowed-out structure can comprise a diamond shape, a square shape, a water drop shape and the like.

The first segment 231 includes a plurality of hollow units 2311. The plurality of hollow units 2311 are arranged along the circumferential direction of the first segment 231, and two adjacent hollow units 2311 are separated from each other at the distal end of the circumferential direction of the first segment 231. That is, it can be understood that a hollowed-out gap L exists between adjacent hollowed-out units 2311 in the circumferential direction of the first section 231, and the hollowed-out gap L ranges from 0.5mm to 8 mm. And because the first section 231 is located between the second inner layer 23a and the second outer layer 23c, the first section 231 can expand in compliance with the second inner layer 23a and the second outer layer 23c, and the second intermediate layer 23b of the nitinol tube has a shape memory function to promote the resetting after expansion, thereby greatly increasing the toughness of the radial supporting force of the distal end of the outer sheath tube 23; meanwhile, the hollowed-out part of the hollowed-out structure is in a furled state, so that enough axial supporting force is provided, and the occurrence of the condition of far-end folds of the outer sheath 23 when the interventional heart valve 82 is retracted is effectively prevented; secondly, the hollow units 2311 are circumferentially separated from each other, so that the distal end of the outer sheath 23 has a flaring which expands circumferentially towards the outer sheath, and thus, a buffer effect is provided when the interventional heart valve 82 is recovered, so that the release and recovery of the interventional heart valve 82 are smoother, and the wrinkles of the interventional heart valve 82 are avoided.

In this embodiment, the first section 231 includes 4-6 hollow units 2311. The hollow units 2311 are disposed apart from each other in the circumferential direction of the first segment 231. The hollow units 2311 are uniformly distributed along the circumferential circumference of the first section 231. And spaces of diamond, rectangle and the like which are not closed in the axial direction and the circumferential direction of the distal ends are formed between two adjacent hollowed-out units 2311.

Referring to fig. 26, in other embodiments, a group of hollow units 2311 may be formed between two adjacent hollow units 2311 of the hollow units 2311 in the circumferential direction of the first segment 231. And two adjacent hollow units 2311 are spaced apart from each other in the circumferential direction of the first segment 231. Of course, a group of hollow units 2311 may be formed among the 3 hollow units 2311 sequentially arranged, and two adjacent groups of hollow units 2311 are separated from each other in the circumferential direction of the first segment 231.

Adjacent two of the hollow units 2311 are separated from each other at the distal end of the first segment 231 in the circumferential direction. Adjacent two of the hollow units 2311 may be connected to the second segment 232 while the circumferential proximal ends of the first segment 231 may be connected to each other or partially connected.

In other embodiments, two adjacent hollow units 2311 are disposed at the proximal ends of the first segment 231 in the circumferential direction, and are connected to the second segment 232, that is: it can be understood that, in the present embodiment, two adjacent hollow units 2311 are disposed independently of each other.

At least one hollow hole 2311b is formed in the hollow unit 2311, and the hollow hole 2311b extends from the distal end to the proximal end along the axial direction of the hollow unit 2311.

Further, 2-4 hollow holes 2311b may be formed in the hollow unit 2311. The two adjacent hollow holes 2311b are mutually communicated or not communicated, that is, the two adjacent hollow holes 2311b are arranged at intervals, so that the structural strength of the hollow unit 2311 is enhanced, and the hollow unit 2311 has enough axial and radial supporting force.

In other embodiments, two hollow holes 2311b are formed in the hollow unit 2311, and the two hollow holes 2311b are arranged from the distal end to the proximal end along the axial direction of the hollow unit 2311; or, two hollow holes 2311b are arranged along the circumferential direction of the hollow unit 2311. In other embodiments, three hollow holes 2311b are formed in the hollow unit 2311, and the three hollow holes 2311b may be arranged in a "one" shape, a triangular shape, or the like on the hollow unit 2311. It will be appreciated that the arrangement of the hollow holes 2311b and the hollow holes 2311b is designed to improve the overall structural strength of the outer sheath, as well as flexibility, radial and axial support. However, the arrangement of the hollow holes 2311b is not limited in the present invention, as long as the arrangement can improve the overall structural strength of the outer sheath.

The hollow unit 2311 includes at least one hollow section 2311a. At least one hollowed-out hole 2311b is formed in the hollowed-out section 2311a. Adjacent hollow elements 2311 are separated from each other between the hollow sections 2311a at the distal ends thereof. The hollowed-out gap L extends along the hollowed-out section 2311a axially to divide the hollowed-out hole 2311.

Further, the arrangement of the hollow holes 2311b on the hollow section 2311a may refer to the arrangement of the hollow holes 2311b on the hollow unit 2311, which will not be described herein.

The area of the hollow hole 2311b is 40% -80% of the area of the hollow unit 2311. Preferably, the area of the hollow hole 2311b is 60% -70% of the area of the hollow unit 2311. Therefore, when the second inner layer 23a, the second middle layer 23b and the second outer layer 23c are bonded by hot melting, the adhesion between the second middle layer 23b and the second inner layer 23a and the second outer layer 23c is better, the bonding force between the three layers is greater, the bonding property is better, the axial supporting force and the radial supporting force of the outer sheath tube 23 are further improved, and the outer sheath tube has enough flexibility; secondly, the area of the hollow hole 2311b occupies the area of the hollow unit 2311 to be large enough, which is favorable for exhausting the gas in the hollow hole 2311b in the thermal fusion bonding process, so as to further improve the bonding force among the second inner layer 23a, the second middle layer 23b and the second outer layer 23c, thereby enhancing the overall structural strength of the outer sheath 23.

The hollow hole 2311b is substantially in a shape of a "drop". When two hollow holes 2311b are formed in the hollow unit 2311, the two hollow holes are approximately in an 8-shaped structure.

Referring to fig. 20 and 23, the distal end of the hollow unit 2311 is further provided with a circular arc segment 2311a ₁ . The arc segment 2311a ₁ Is protruded toward the distal end of the hollow unit 2311. The arc segment 2311a ₁ And the hollow unit 2311 encloses the hollow hole 2311b. Arc segment 2311a ₁ The device is provided with an inner circular arc section and an outer circular arc section, wherein the radius of the inner circular arc section ranges from 0.3mm to 1mm, and preferably, the radius of the inner circular arc section ranges from 0.5 mm to 0.8mm; the radius of the outer arc section is in the range of 1mm-16mm, preferably the radius of the outer arc section is in the range of preferably 0.6-3mm, more preferably 0.7-2mm. The distal end of the grating body 2311a adopts a circular arc segment 2311a ₁ Not only effectively prevents the insertion heart valve 82 from being pierced, torn, etc. by the distal end of the first section 231 during the retraction of the insertion heart valve 82; next, arc segment 2311a is used ₁ Can provide greater radial support to the distal end of the outer sheath 23, thereby further facilitating compression of the interventional heart valve 82 during retraction of the valve 82.

Of course, in other embodiments, the hollow units 2311 may not have hollow holes, and two adjacent hollow units 2311 are disposed at the distal end of the first segment 231 in the circumferential direction and separated from each other.

The second section 232 is intended to include an increase in the overall structural strength and flexibility provided by the outer sheath 23. The axial and radial support forces of the second segment 232 may be greater than the axial and radial support forces of the first segment 231, thereby providing a greater restraining force to load the interventional heart valve 82.

The second section 232 includes a first transition section 2321, a curved section 2322, and a second transition section 2323. The first transition 2321, the curved 2322, and the second transition 2323 are distributed sequentially from the distal end to the proximal end of the second intermediate layer 22. The second section 232 is connected to the first section 231 by the first transition section 2321. The first transition section 2321 is provided with a plurality of connection holes 2321a. The total area of the connecting holes 2321a accounts for 60-70% of the area of the first transition section 2321, so that the bonding area between the second section 232 and the second inner layer 21a and the second outer layer 23c during the thermal fusion bonding is maximized, the overall structural strength of the outer sheath tube 23 is improved, and meanwhile, the outer sheath tube 23 has flexibility and sufficient axial and radial supporting force.

Preferably, the connection hole 2321a includes a circular connection hole 2321a, an elliptical connection hole 2321a, a square connection hole 2321a, and the like. In this embodiment, a plurality of circular connection holes 2321a are formed in the first transition section 2321. The plurality of circular connecting holes 2321a are uniformly distributed at intervals in the circumferential direction of the first transition section 2321.

The curved segments 2322 serve to provide increased circumferential support, proper axial and radial support of the outer sheath 23 to prevent buckling or kinking of the outer sheath 23 and overall flexibility, allowing the outer sheath 23 to meet different implantation points for release of the interventional heart valve 82.

Further, the curved segment 2322 includes helical segments 2322a axially distributed along the curved segment 2322. The curved segment 2322 is cut by a spiral. The pitch between adjacent helical segments 2322a is t1, the total of the pitch t1 on the curved segments 2322 is t, the t accounts for 30-60% of the total height (length) of the curved segments 2322, and preferably the t accounts for 40-50% of the total height (length) of the curved segments 2322. Thereby maximizing the bonding area between the curved segment 2322 and the second inner and outer layers 21a, 23c during thermal fusion bonding, and thus providing the outer sheath 23 with both flexibility and sufficient axial and radial support.

In other embodiments, the curved segment 2322 may be a C-shaped loop, the curved segment 2322 being cut into a C-shaped loop by a C-shape. The two adjacent C-shaped rings are arranged at intervals, but are not disconnected, namely: adjacent two C-shaped rings are connected with each other. The C-shaped rings are connected in series through a reinforcing rib 2322 a. Further, the two adjacent C-shaped rings may be equally spaced or not equally spaced, which is not limited in this embodiment.

The second transition 2323 serves as a connection between the curved section 2322 and the third section 233. The second transition section 2323 is provided with a plurality of connection holes 2321a. The plurality of connection holes 2321a are provided, so that the bonding area between the second transition section 2323 and the second inner layer 21a and the second outer layer 23c during the thermal fusion bonding is maximized, and further, the overall structural strength of the outer sheath tube 23 is improved, and meanwhile, the outer sheath tube 23 has flexibility and sufficient axial and radial supporting force.

Preferably, in the present embodiment, the second transition section 2323 is provided with a plurality of square connection holes 2321a. The square connecting holes 2321a are uniformly distributed at intervals in the circumferential direction of the second transition section 2323. Of course, it is understood that the square-shaped connection holes 2321a may be distributed at intervals in the circumferential direction of the second transition section 2323.

The third section 233 extends into the transition duct 22. The third section 233 includes a plurality of floating plates 2331, the plurality of floating plates 2331 are circumferentially spaced apart from the third section 233, and each floating plate 2331 is provided with a plurality of connection holes 2321a. Here, the plurality of floating plates 2331 are circumferentially spaced to facilitate the folding of the third section 233 in the transition pipe 22, and at the same time, the plurality of connecting holes 2321a are provided on the floating plates 2331, so that the bonding area between the third section 233 and the second inner layer 21a and the second outer layer 23c during the thermal fusion bonding is maximized, and further, the overall structural strength of the outer sheath pipe 23 is improved.

In the present invention, since the interventional heart valve 82 is compressed by utilizing the characteristic that the nitinol alloy becomes soft when cooled when loaded, the interventional heart valve 82 is compressed and loaded in the outer sheath 23 in an ice-water mixture. The interventional heart valve 82 is gradually deployed from the distal end of the outer sheath 23 during the release of the interventional heart valve 82 in the human body. It is conceivable that the temperature of the human body is far higher than the temperature of the ice-water mixture Yu Bing-water mixture, and that the interventional heart valve 82 is heated in the human body during the release process, and that the expansion force of the interventional heart valve 82 at the distal end of the outer sheath 23 is very large. When an inaccurate release position of the interventional heart valve 82 is found, the outer sheath 23 needs to provide a sufficient axial, radial support force to compress the interventional heart valve 82 in order to recompress the interventional heart valve 82 back into the outer sheath 23.

In the present invention, the second intermediate layer 23b is disposed in the outer sheath 23, so that the bonding property among the second inner layer 23a, the second intermediate layer 23b and the second outer layer 23c of the outer sheath 23 is better, the axial and radial supporting forces of the whole outer sheath 23 are improved, and the outer sheath has certain flexibility, so that sufficient axial and radial supporting forces are provided in the recovery process of the interventional heart valve 82.

Specifically, the hollow hole 2311b is formed by arranging the first section 231 at the distal end of the second middle layer 23b, and the hollow units 2311 on the first section 231 are separated from each other in the circumferential direction of the distal end of the first section 231, so that the distal end of the outer sheath 23 has better expansibility, and simultaneously has sufficient axial and radial supporting forces, and further, from the fact that the total area of the hollow holes 2311b on the hollow unit 2311 occupies 40-80% of the area of the hollow unit 2311, it can be seen that when the second inner layer 23a, the second middle layer 23b and the second outer layer 23c are thermally fused, the adhesion between the second middle layer 23b and the second inner layer 23a and the second outer layer 23c is better, the adhesion between the three layers is larger, the bonding is better, and further, the axial supporting force and the radial supporting force of the outer sheath 23 are improved, and the outer sheath has sufficient flexibility.

The operation of the conveyor is described below.

The interventional heart valve 82 is first compressed in an ice-water mixture, loaded onto the loading section 112 of the core tube assembly 10 and received within the outer sheath 20. After delivery of the interventional heart valve 82 to the lesion site of the human body, advancement of the core tube assembly 10 relative to the portion of the sheath 20 is controlled by operation of the handle 30 to self-expand the interventional heart valve 82 within the sheath 20.

When the accurate release position of the interventional heart valve 82 is ensured, the core tube assembly 10 continues to advance, the interventional heart valve 82 is released and deployed at the lesion position, and the interventional heart valve 82 is separated from the fixing head 1111, and the release of the interventional heart valve 82 is completed.

If during the release, the release position of the interventional heart valve 82 is found to be incorrect, the core tube assembly 10 is controlled to retract by operating the handle 30, the sheath 20 provides sufficient axial and radial support force during the retraction, and the interventional heart valve 82 is compressed under the guidance of the floating stop 1112 to accommodate the interventional machine 82 within the sheath 20, thus completing the retraction of the interventional heart valve 82.

The embodiments of the present invention are described using a heart valve stent as an implant, and those skilled in the art will appreciate that the delivery device disclosed in the present invention may also be used to place other implants in addition to a heart valve stent as a carrier in a corresponding location on the body. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. It is apparent that such modifications and variations are intended to be within the scope of the invention as claimed. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not constitute any particular limitation on the present invention.

Claims

1. The delivery device of the interventional heart valve comprises a core tube assembly, wherein a guide head and a fixing head are fixed on the core tube assembly, the guide head is fixed at the distal end of the core tube assembly, the fixing head extends out of the proximal end side of the core tube assembly, and an interventional heart valve installation position is arranged between the guide head and the fixing head; an outer sheath tube which can axially slide is arranged at the periphery of the insertion heart valve installation position, which is characterized in that,

the outer wall of the fixed head is provided with a positioning part matched with the connecting lug of the interventional heart valve;

when the interventional heart valve is in a loading state, the distal end head of the floating limiting strip is axially overlapped on at least the connecting lug, and when the interventional heart valve is released, the floating limiting strip can swing freely and release radial pressure on the connecting lug along with the withdrawal of the outer sheath tube.

2. The delivery device of an interventional heart valve of claim 1, further comprising an outer sheath comprising a delivery catheter, a transition tube, and the outer sheath, the delivery catheter, the transition tube, and the outer sheath being connected in sequence from a distal end to a proximal end of the outer sheath.

3. The delivery device of an interventional heart valve of claim 2, wherein the distal end of the delivery catheter increases in strength sequentially from the delivery catheter to the outer sheath.

4. The delivery device of an interventional heart valve of claim 2, wherein the delivery catheter comprises a three-layer structure of a first inner layer, a first middle layer, and a first outer layer disposed sequentially from inside to outside in a radial direction of the delivery catheter.

5. The delivery device of an interventional heart valve of claim 4, wherein the first inner layer and the first outer layer are both of the same or different polymeric materials.

6. The delivery device of an interventional heart valve of claim 4, wherein the first intermediate layer is a metal braid or cut from a metal tube.

7. The delivery device of an interventional heart valve of claim 2, wherein the outer sheath comprises a three-layer structure of a second inner layer, a second middle layer, and a second outer layer disposed sequentially from inside to outside in a radial direction of the outer sheath.

8. The delivery device of an interventional heart valve of claim 7,

The second middle layer is a reinforcing layer and is formed by cutting a stainless steel pipe or a nickel-titanium alloy pipe;

the second intermediate layer comprises a first section, a second section and a third section;

the first section, the second section and the third section are distributed in sequence from the distal end of the outer sheath to the proximal end of the outer sheath.

9. The delivery device of an interventional heart valve of claim 8, wherein the first segment comprises a hollowed out structure that is in a collapsed state along a radial direction of the outer sheath.

10. The delivery device of an interventional heart valve of claim 8, wherein the first segment comprises a plurality of hollowed out elements circumferentially arranged along the first segment, adjacent two hollowed out elements being separated from each other at a circumferentially distal end of the first segment.

11. The delivery device of an interventional heart valve of claim 8, wherein the second segment comprises a first transition segment, a curved segment, and a second transition segment that are sequentially distributed from a distal end to a proximal end of the second intermediate layer, the second segment being connected to the first segment by the first transition segment.

12. The interventional heart valve delivery device of claim 11, wherein the first transition section is provided with a plurality of connection holes, the total area of the connection holes comprising 60-70% of the area of the first transition section.

13. The delivery device of an interventional heart valve of claim 11, wherein the curved segment comprises helical segments axially distributed along the curved segment, the curved segment being cut by a helix.

14. The interventional heart valve delivery device of claim 11, wherein the curved segments are C-shaped loops cut in a C-shape, adjacent C-shaped loops being spaced apart and interconnected.

15. The delivery device of an interventional heart valve of claim 1, wherein the positioning portions are positioning slots, wherein the connector lugs are received in corresponding positioning slots after the interventional heart valve is loaded, and wherein the floating stop strips are folded over the connector lugs to maintain engagement between the connector lugs and the positioning portions before the connector lugs are fully released from the outer sheath.

16. The delivery device of an interventional heart valve of claim 1, wherein the positioning portion is a positioning boss, the connector tab is disposed on the positioning boss after the interventional heart valve is loaded, and the floating retainer is folded over the connector tab to maintain engagement between the connector tab and the positioning portion before the connector tab is fully released from the outer sheath.