CN217090812U - Delivery guidewire - Google Patents

Abstract

A conveying guide wire is used for conveying a dense mesh support and comprises a conical wire, a hypotube, a proximal end constraint line, a distal end constraint line and a threading structure, wherein the proximal end of the conical wire is connected with the hypotube, a loading area for loading the dense mesh support is formed on the conical wire, the hypotube is positioned on the near side of the loading area, the threading structure is fixed on the conical wire and positioned on the far side of the loading area, the dense mesh support is sleeved in the loading area of the conical wire during loading, the distal end constraint line shuttles back and forth the distal end of the dense mesh support for one circle, and the end part of the distal end constraint line penetrates through the threading structure and then penetrates out along the hypotube to transmit pulling force to the far side to the dense mesh support; after the proximal end constraint line shuttles back and forth the near end of the dense mesh stent for a circle, the end part of the proximal end constraint line extends towards the near end and penetrates out along the hypotube so as to transmit the pulling force towards the near side to the dense mesh stent. The utility model discloses a carry seal wire can reduce the frictional force between dense net support and the little pipe.

Description

Delivery guidewire

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a carry seal wire.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Intracranial aneurysm is a fatal vascular disease, the incidence rate is not low, the early aneurysm operation is mainly treated by surgical operation, but the treatment method has the defects of great operation difficulty, large wound area and more postoperative complications. The difference between the interventional operation and the traditional operation is that the interventional operation does not need to open a larger operation window, corresponding treatment can be carried out by adopting a smaller operation window, the interventional operation of the hemangioma is just through vascular puncture, and then a dense mesh stent or a spring ring is implanted into target lesion through instruments such as a microcatheter and the like, so as to treat the aneurysm.

The intervention treatment of present intracranial vascular aneurysm mainly treats through adopting the close net support, and the principle of close net support treatment aneurysm is exactly through the close net characteristic of close net support self, can lead to the blood flow, covers the back with the tumor neck of aneurysm through the close net support, can reduce the blood flow and flow into aneurysm to make the internal blood pressure of tumor reduce, induce the internal thrombus that forms of tumor and then reach the effect of treatment.

The existing intracranial aneurysm interventional therapy is carried out by a dense net support, the conveying problem of the dense net support is usually considered, the dense net support is conveyed mainly by a conveying system, the principle of the dense net support is mainly that the dense net support is conveyed by means of friction force, the dense net support is sleeved on a friction pipe with a large friction coefficient on a conveying guide wire, then the dense net support and the conveying guide wire are arranged in a micro catheter with a diameter smaller than that of the dense net support, the friction force between the dense net support and the friction pipe is larger than that between the dense net support and the inner wall of the micro catheter, when the conveying guide wire is pushed by external force, the dense net support and a silica gel block are kept in a relatively static state, the dense net support and the micro catheter move relatively, and the conveying guide wire achieves the purpose of conveying the dense net support. However, in the process of conveying the dense mesh stent by the current conveying guide wire, because the dense mesh stent has the self-expansion characteristic, the dense mesh stent generates mutual extrusion force with the inner wall of the micro catheter in the conveying process, so that the friction force between the dense mesh stent and the inner wall of the micro catheter is increased, the conveying guide wire is possibly difficult to push, and when the pushing is difficult, the conveying guide wire is possibly bent if the pushing force is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem of excessive friction between a dense net support and the inner wall of a micro-catheter at least. The purpose is realized by the following technical scheme:

the embodiment of the application provides a conveying guide wire, which is used for conveying a dense mesh stent along a micro catheter, and comprises a conical wire, a hypotube, a proximal end constraint line, a distal end constraint line and a threading structure, wherein the proximal end of the conical wire is connected with the hypotube, a loading area for loading the dense mesh stent is formed on the conical wire, the hypotube is positioned at the near side of the loading area, the threading structure is fixed on the conical wire and positioned at the far side of the loading area, the dense mesh stent is sleeved in the loading area of the conical wire during loading, the distal end constraint line shuttles around the distal end of the dense mesh stent, and the end part of the distal end constraint line penetrates through the threading structure and then penetrates out along the hypotube to transmit pulling force to the far side to the dense mesh stent; after the proximal end constraint line shuttles back and forth the near end of the dense mesh stent for a circle, the end part of the proximal end constraint line extends towards the proximal end and penetrates out along the hypotube to transmit the near side pulling force to the dense mesh stent.

When the conveying guide wire is used, the dense mesh support is sleeved in the loading area of the conical wire, then the part of the conveying guide wire loaded with the dense mesh support is conveyed into the micro-catheter to be conveyed, in the conveying process, pulling force can be applied to two ends of the dense mesh support through the far-end constraint line and the near-end constraint line, so that the axial size of the dense mesh support is elongated and the radial size of the dense mesh support is reduced, the pressure applied to the inner wall of the micro-catheter by the dense mesh support can be reduced, the friction force between the dense mesh support and the micro-catheter is reduced, the difficulty in pushing the conveying guide wire in the micro-catheter is reduced, and the conveying guide wire is prevented from being bent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a diagram illustrating the delivery of a dense mesh stent and a delivery guidewire through a microcatheter according to one embodiment of the present invention;

fig. 2 is a schematic structural view of a microcatheter according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a dense mesh support in an embodiment of the present invention;

fig. 4 is a diagram illustrating a state in which the dense mesh stent is loaded on the delivery guidewire and the proximal end of the dense mesh stent is bound by the proximal binding line according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a dense mesh stent (not including proximal and distal binding wires) according to an embodiment of the present invention;

fig. 6 is a diagram illustrating the state of the distal and proximal lashing lines shuttling along the tight mesh stent in an embodiment of the present invention;

fig. 7 is an enlarged view of the state of the distal constraint line shuttling along the dense mesh stent in an embodiment of the present invention;

FIG. 8 is a prior art state diagram of a delivery guidewire releasing a dense mesh stent;

fig. 9 is a state diagram of a delivery guidewire releasing a dense mesh stent in an embodiment of the present invention;

fig. 10 is a schematic structural view of a threading structure according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an up and down orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present application, the end closer to the operator during use is referred to as the "proximal end", and the end farther from the operator is referred to as the "distal end".

As shown in figure 1, a delivery guide wire 12 is matched with a micro-catheter 11 for delivering a dense-mesh stent 30, and the dense-mesh stent 30 is loaded on the delivery guide wire 12 and is delivered to a diseased blood vessel along the micro-catheter 11.

As shown in fig. 2, the micro-catheter 11 is a tube structure with a catheter lumen, and during the operation, the distal end of the micro-catheter 11 is placed at the diseased blood vessel, and the proximal end of the micro-catheter 11 is left outside the body, so as to establish a delivery channel from the outside to the inside of the body.

As shown in fig. 3, the dense mesh stent 30 is a mesh tube structure formed by interweaving a plurality of strands of knitting wires, the dense mesh stent 30 of this embodiment uses each left-direction knitting wire and two right-direction knitting wires to alternately press against each other (commonly referred to as "one-to-two"), and the material of the knitting wires may include a metal material (such as nickel-titanium wire, platinum wire, etc.) with shape memory and developing property. The braided wire can be a single wire or a multi-strand wire. The number of the weaving threads is 48 or 64, wherein one part of the weaving threads is made of metal materials with shape memory, and the other part of the weaving threads is made of metal materials with developing property. The dense mesh stent 30 is loaded over the delivery guidewire 12 and delivered along the microcatheter 11. After the dense mesh stent 30 is delivered to the target site, the dense mesh stent 30 self-expands to the deployed configuration by removing the radial constraint on the dense mesh stent 30, thereby performing the treatment.

Referring to fig. 4 and 5 together, the delivery guidewire 12 includes a tapered wire 13, a hypotube 14, a proximal tether line 15, a distal tether line 16, and a threading structure 17. The proximal end of the conical wire 13 is connected with the hypotube 14, and a loading area (not shown) for loading the dense mesh stent 30 is formed on the conical wire 13. The hypotube 14 is located proximal to the loading zone, and the hypotube 14 is located outside of the loading zone. Threading structure 17 is fixed on conical wire 13 and threading structure 17 is located distal to the loading zone, threading structure 17 is located outside the loading zone. Referring to fig. 4, 6 and 7, when the dense mesh stent 30 is loaded, the dense mesh stent 30 is sleeved in the loading area of the tapered wire 13, the distal constraint line 16 shuttles back and forth the distal end of the dense mesh stent 30 for a circle, and the end of the distal constraint line 16 passes through the threading structure 17 and then passes out along the hypotube 14 to transmit the pulling force to the dense mesh stent 30 in the distal direction; after the proximal lashing line 15 has shuttled back and forth the proximal end of the dense mesh stent 30 a week, the end of the proximal lashing line 15 extends proximally and exits along the hypotube 14 to transmit a proximal pulling force to the dense mesh stent 30.

When the delivery guide wire 12 is used, the dense mesh stent 30 is sleeved in the loading area of the tapered wire 13, then the part of the delivery guide wire 12 loaded with the dense mesh stent 30 is sent into the microcatheter 11 for delivery, in the delivery process, tension can be applied to two ends of the dense mesh stent 30 through the distal end constraint line 16 and the proximal end constraint line 15, so that the axial dimension of the dense mesh stent 30 is lengthened, and the radial dimension is shortened, thus the pressure applied to the inner wall of the microcatheter 11 by the dense mesh stent 30 can be reduced, the friction force between the dense mesh stent 30 and the microcatheter 11 is reduced, the difficulty in pushing the delivery guide wire 12 in the microcatheter 11 is reduced, and the delivery guide wire 12 is prevented from being bent.

In the process of applying the pulling force to the distal and proximal tether lines 16 and 15, since the distal and proximal tether lines 16 and 15 are shuttled on the dense mesh stent 30 for one turn, the entire circumferential surface of the dense mesh stent 30 is subjected to the pulling force, and if only a part of the mesh is shuttled, a part of the dense mesh stent 30 is not stretched.

The hypotube 14 is made of nitinol or stainless steel and has an outer diameter ranging from 0.4mm to 0.6 mm. As shown in fig. 4, the hypotube 14 has a lumen through which a distal tether line 15 and a proximal tether line 16 extend. The hypotube 14 is further provided with an inlet hole 141 and an outlet hole 142 which are communicated with the lumen, the ends of the distal tether line 16 and the proximal tether line 15 are both penetrated through the inlet hole 141 and penetrated out through the outlet hole 142, and a pulling force is applied to the end of the distal tether line 16 and the end of the proximal tether line 15 which are penetrated out through the outlet hole 142, so that the dense mesh stent 30 can be axially elongated and radially contracted.

Referring again to fig. 4, the inlet hole 141 penetrates opposite sides of the tube wall of the hypotube 14, and the outlet hole 142 penetrates opposite sides of the tube wall of the hypotube 14, so that different tether lines can pass out along different sides of the outlet hole 142, thereby preventing malfunction caused by mutual crossing of the distal tether line 16 and the proximal tether line 15.

Referring to fig. 5 again, the distal portion of the hypotube 14 is provided with hollowed-out exit holes 143 by laser engraving, and the distance between the exit holes 143 gradually increases from the distal end to the proximal end, so that the distal end of the hypotube 14 has sufficient flexibility to facilitate passing through a curved blood vessel, and the proximal end of the hypotube 14 has better transferability of pushing force.

Referring again to fig. 5, the hypotube 14 is further covered with a PTFE heat shrink film 144, so as to protect the exit hole 143 of the hypotube 14 and prevent the hypotube 14 from being straightened when the pulling force is too large.

The tapered wire 13 is an elongated rod-shaped structure, and the outer diameter of the distal end of the tapered wire 13 is thinner than that of the proximal end of the tapered wire, so that the distal end of the tapered wire 13 has better flexibility and the proximal end of the push guide wire 13 has good push performance. The outer diameter of the tapered wire 13 gradually increases from the distal end to the proximal end, and the proximal end of the tapered wire 13 is inserted into the hypotube 14 and connected to the hypotube 14.

The conveying guide wire 12 further comprises a friction pipe 18 located in the loading area, the friction pipe 18 is rotatably sleeved on the conical wire 13, the friction pipe 18 is axially matched with the conical wire 13 in a limiting mode, when the dense net support 30 is conveyed, the dense net support 30 is sleeved in the loading area of the conical wire 13, the friction pipe 18 is abutted to the inner wall of the near end of the dense net support 30 and provides friction force, and the friction force between the friction pipe 18 and the inner wall of the dense net support 30 is larger than the friction force between the outer wall of the dense net support 30 and the micro catheter 11, so that the conveying guide wire 12 can be pushed in the micro catheter 11. In an embodiment of the present invention, the friction tube 18 can cooperate with the distal constraint line 16 to stretch the mesh-dense support 30, that is, the proximal constraint line 15 can be omitted in this embodiment, and the mesh-dense support 30 can also be stretched. Specifically, the dense mesh stent 30 is sleeved in the loading area of the tapered wire 13, the friction tube 18 abuts against the inner wall of the proximal end of the dense mesh stent 30 and provides friction, and the dense mesh stent 30, the distal constraint line 16 and the friction tube 18 are loaded in the microcatheter 11. Under the compression of the microcatheter 11, the inner wall of the proximal end of the dense mesh stent 30 abuts the friction tube 18, so that the friction tube 18 can anchor the proximal end of the dense mesh stent 30. When the distal tether line 16 is pulled, the proximal end of the dense mesh stent 30 is anchored with the friction tube 18, while the distal end of the dense mesh stent 30 is stretched by the distal tether line 16, thereby causing the overall length of the dense mesh stent 30 to increase while the radial dimension to decrease.

Referring to fig. 5 again, the transporting guide wire 12 further includes a first developing sleeve 19 and a second developing sleeve 21, the first developing sleeve 19 is located at a proximal side of the friction tube 18 and relatively fixedly sleeved on the tapered wire 13, the second developing sleeve 21 is located at a distal side of the friction tube 18 and relatively fixedly sleeved outside the tapered wire 13, the first developing sleeve 19 and the second developing sleeve 21 cooperate to axially limit the friction tube 18, so as to prevent the friction tube 18 from being driven by the dense mesh support 30 to move axially, and meanwhile, the first developing sleeve 19 and the second developing sleeve 21 can also be used to display whether the position of the proximal end of the dense mesh support 30 is located on the friction tube 18 under DSA.

As shown in FIG. 5, the delivery guidewire 12 further includes a visualization spring 22, the distal end of the tapered wire 13 is inserted into the visualization spring 22 and is fixedly attached to the visualization spring 22, the proximal end of the visualization spring 22 is fixedly attached to the threading structure 17, and the visualization spring 22 can be used to visualize the location of the distal end of the delivery guidewire 12 within the patient.

Referring to fig. 6, the distance between the grid shuttled by the distal-end constraint line 16 and the grid at the distal end of the dense mesh stent 30 is two grids, so that the grid lines are bound on both the front and rear sides of the grid shuttled by the distal-end constraint line 16, when the distal-end constraint line 16 applies a pulling force to the grid shuttled by the distal-end constraint line 16, the grid lines are not dispersed because both the front and rear sides of the grid shuttled by the distal-end constraint line 16 are bound by the grid lines, and if a pulling force is applied to the grid at the end of the dense mesh stent 30, the grid lines at the end are pulled apart because of lack of the binding of the grid lines. The distance between the grid shuttled by the near-end constraint line 15 and the grid at the near end of the dense-mesh stent 30 is two grids, because the grid lines are bound on the front and back sides of the grid shuttled by the near-end constraint line 15 when the far-end constraint line 16 and the near-end constraint line 15 exert pulling force on the grid shuttled by the near-end constraint line 15, and because the grid lines are bound on the front and back sides of the grid shuttled by the near-end constraint line 15 when the near-end constraint line 15 exerts pulling force on the grid shuttled by the near-end constraint line, the grid lines are not scattered.

As shown in fig. 8, the threading structure 17 includes a first sleeve 171, the first sleeve 171 is relatively fixedly sleeved on the conical wire 13 and connected with the developing spring 22, the first sleeve 171 is provided with a threading hole 172 for the distal-end constraint line 16 to pass through, and the first sleeve 171 can provide a fulcrum for the distal-end constraint line 16, so that the distal-end constraint line 16 can convert the force acting on the free end of the distal-end constraint line 16 and toward the proximal end into the force acting on the distal end of the dense-mesh stent 30 by taking the first sleeve 171 as the fulcrum, thereby cooperating with the proximal-end constraint line 15 to jointly stretch the dense-mesh stent 30.

As shown in fig. 8, the threading structure 17 further includes a second cannula 173, the second cannula 173 being located proximal to the first cannula 171 and fixedly attached to the first cannula 171. The outer diameter of the second sleeve 173 is gradually reduced along the direction from the distal end of the second sleeve 173 to the proximal end thereof, when the dense mesh stent 30 is released, the proximal constraint line 15 and the distal constraint line 16 are firstly withdrawn to the outside of the body, then the delivery guide wire 12 is pushed to release the distal end of the dense mesh stent 30 at the distal side of the tumor cavity, then the dense mesh stent 30 and the microcatheter 11 are integrally moved to the proximal side of the tumor cavity, and then the delivery guide wire 12 is pushed to release the dense mesh stent 30. When the stent 30 is completely released and the delivery guidewire 12 needs to be retracted back into the microcatheter 11, the outer diameter of the second sleeve 173 is gradually reduced, so that the end of the second sleeve 173 is prevented from hooking the stent 30, thereby preventing the stent 30 from being pulled to be displaced.

Because the microcatheter 11a and the delivery guidewire 12a both have a degree of resiliency. As shown in fig. 9, when the dense mesh stent 30 according to the related art is released in a tortuous blood vessel 50, the nozzle of the microcatheter 11a collides with the side of the blood vessel 50, which is a large bend, and thus the stress reaction of the blood vessel 50 is easily induced. In this embodiment, as shown in fig. 10, the delivery guidewire 12 and the microcatheter 11 are shaped by pulling on the distal tether line 16 and/or the proximal tether line 15 so that the microcatheter 11 is positioned at the axis of the curved vessel 50 and the orifice of the microcatheter 11 is away from the vessel wall, thereby avoiding irritation of the vessel. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A delivery guide wire for delivering a dense mesh stent along a microcatheter is characterized in that the delivery guide wire comprises a tapered wire, a hypotube, a proximal end constraint line, a distal end constraint line and a threading structure, wherein the proximal end of the tapered wire is connected with the hypotube, a loading area for loading the dense mesh stent is formed on the tapered wire, the hypotube is positioned at the near side of the loading area, the threading structure is fixed on the tapered wire and positioned at the far side of the loading area, the dense mesh stent is sleeved in the loading area of the tapered wire during loading, the distal end constraint line shuttles around the distal end of the dense mesh stent, and the end part of the distal end constraint line penetrates through the threading structure and then penetrates out along the hypotube to transmit the pulling force to the far side; after the proximal end constraint line shuttles back the proximal end of the dense mesh stent for a circle, the end part of the proximal end constraint line extends towards the proximal end and penetrates out along the hypotube to transmit the pulling force towards the proximal side to the dense mesh stent.

2. The delivery guidewire of claim 1, wherein the hypotube has a lumen, and the hypotube further defines an entry hole and an exit hole communicating with the lumen, and the distal tether line and the proximal tether line both have ends that pass through the entry hole and pass out of the exit hole.

3. The delivery guidewire of claim 2, wherein the inlet aperture extends through opposing sides of a wall of the hypotube and the outlet aperture extends through opposing sides of the wall of the hypotube.

4. The pushwire of claim 1, wherein the lattice traversed by the distal lashing line is two lattices away from the lattice at the distal end of the dense mesh stent; the distance between the grid shuttled by the near-end constraint line and the grid at the near end of the dense-net stent is two grids.

5. The pushwire of claim 1, further comprising a friction tube disposed in the loading region, wherein the friction tube is rotatably disposed over the tapered wire, and axially limits the friction tube from the tapered wire, and frictionally engages an inner wall of the dense mesh stent during delivery of the dense mesh stent.

6. The pushwire of claim 5, further comprising a first visualization sleeve and a second visualization sleeve, wherein the first visualization sleeve is located at a proximal side of the friction tube and relatively fixedly sleeved on the tapered wire, the second visualization sleeve is located at a distal side of the friction tube and relatively fixedly sleeved outside the tapered wire, and the first visualization sleeve and the second visualization sleeve cooperate to axially limit the friction tube.

7. The pushwire of claim 6 further comprising a visualization spring, wherein a distal end of said tapered wire is inserted into and fixedly attached to said visualization spring, and wherein a proximal end of said visualization spring is fixedly attached to said threading structure.

8. The pushwire of claim 7, wherein said threading structure comprises a first sleeve portion, said first sleeve portion is relatively fixedly disposed on said conical wire and connected to said visualization spring, said first sleeve portion is provided with a threading hole for passing said distal lashing wire therethrough.

9. The pushwire of claim 8, wherein said threading structure further comprises a second sleeve positioned proximal to and fixedly attached to said first sleeve, said second sleeve having an outer diameter that decreases in a direction from a distal end of said second sleeve to a proximal end thereof.

10. The pushwire of claim 1, wherein said hypotube has slots therein, said slots being spaced at progressively increasing distances from said distal end to said proximal end.

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