CN114903557A - A suction device and method for making and using the same - Google Patents

Abstract

The invention provides an absorbing apparatus, a manufacturing method and a using method of the absorbing apparatus, wherein the absorbing apparatus comprises a conveying pipeline, a pushing device and a bell mouth with the size capable of being adjusted in a self-adaptive mode along the radial direction; the small-mouth end of the horn mouth is connected with the far end of the conveying pipeline; pusher passes through conveying pipeline's near-end stretches into conveying pipeline with inside the horn mouth, just pusher's distal end detachable with the macrostoma of horn mouth end is connected, pusher is configured to drive the horn mouth is followed conveying pipeline's axial displacement. The manufacturing method and the using method of the suction apparatus provided by the invention can increase the suction pressure when the thrombus is sucked and reduce the possibility of escape of the thrombus in the suction process.

Description

A kind of suction device and method of making and using the same

technical field

The invention relates to the technical field of medical devices, in particular to a suction device and a method for making and using the suction device.

Background technique

Stroke is an acute cerebrovascular disease, a disease that damages brain tissue due to sudden rupture of blood vessels in the brain or blockage of blood vessels that prevents blood from flowing into the brain, including ischemic and hemorrhagic strokes. Among them, the incidence of ischemic stroke is higher than that of hemorrhagic stroke, accounting for 60% to 70% of the total number of strokes. Severe stroke can cause permanent neurological damage, and if not diagnosed and treated in time in the acute phase, serious complications and even death can result. At the same time, stroke also has the characteristics of high morbidity, high mortality and high disability rate.

Modern medicine has different treatment methods according to different parts and types of stroke. Mainly divided into drug thrombolysis and surgical treatment. Among them, drug thrombolytic therapy is an effective treatment method, but there are strict time window requirements, and the best time for thrombolytic therapy is within 6 hours. Interventional therapy is a kind of surgical operation. With the advancement of technology and the characteristics of small trauma and quick recovery, interventional therapy has become a direction of rapid development. For ischemic stroke, intravascular mechanical thrombectomy is often used to deliver the thrombectomy device to the lesion site, and methods including thrombectomy, laser thrombectomy, thrombectomy net, and thrombectomy are used. However, during the operation of the suction thrombus, there is still the possibility of small fragments of thrombus escaping with the blood flow. And prolonged suction, will lead to excessive blood loss, causing life-threatening.

Therefore, how to provide a suction device to overcome the above-mentioned defects in the prior art has increasingly become one of the technical problems to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a suction device and a method for making and using the suction device, so as to solve the problem of the possibility of small thrombus escaping with the blood flow during the operation of the suction and suction thrombus method existing in the prior art, and Prolonged suction leads to problems with excessive blood loss.

In order to achieve the above object, the present invention provides a suction device, comprising a conveying pipeline, a pushing device and a bell mouth whose size can be adjusted adaptively along the radial direction;

Wherein, the small mouth end of the bell mouth is connected to the distal end of the conveying pipeline;

The pushing device extends into the conveying line and the inside of the bell mouth through the proximal end of the conveying line, and the distal end of the pushing device is detachably connected to the large end of the bell mouth, and the The pushing device is configured to drive the bell mouth to move in the axial direction of the conveying pipeline.

Optionally, the bell mouth includes an elastic body and a support structure disposed in the elastic body;

Wherein, the support structure is configured so that the elastic body can be trumpet-shaped when no external force acts.

Optionally, the support structure includes a set of distal support segments, a set of proximal support segments, and at least one set of intermediate support segments disposed between the distal support segments and the proximal support segments, each set of The support segment includes at least two circular arc segments with equal radius and arc length;

Wherein, the distal support section is located at the large mouth end of the bell mouth, and the proximal support section is located at the small mouth end of the bell mouth;

The radius and arc length of the circular arc segment of the distal support segment are greater than the radius and arc length of the circular arc segment of the intermediate support segment, and the radius and arc length of the circular arc segment of the intermediate support segment are greater than those of the proximal end The radius and arc length of the circular arc segment of the support segment decrease sequentially from the large mouth end to the small mouth end of the bell mouth;

The arc segments of any group of the support segments are dislocated and symmetrically arranged along the axial direction of the bell mouth, and form an open ring when there is no radially inward acting force.

Optionally, the radius of the arc segment included in the distal support segment is greater than the radius of the inner wall of the blood vessel.

Optionally, the material of the elastic body includes: polytetrafluoroethylene, polyamide, polyurethane, polyether block amide and/or silicone rubber; the material of the support structure includes: nickel-titanium alloy and/or stainless steel.

Optionally, the push device includes at least two push rods, the distal ends of the two push rods and the large mouth end of the bell mouth can be detachably connected, and the push rod is symmetrical about the central axis of the bell mouth. .

Optionally, it also includes an electrolytic decoupling device, where the distal ends of the two push rods are connected to the bell mouth with an electrolytic decoupling point, and the electrolytic decoupling device is used to remove the two push rods from the Detached at the point of electrolysis.

Optionally, a lubricating layer is further provided on the outer wall of the conveying pipeline and/or the bell mouth.

The present invention also provides a method for making a suction device, including making the above-mentioned suction device, and the specific fabrication steps are as follows:

Utilize a conical mold to process a layer of PTFE material as the inner layer of the bell mouth;

Along the direction of the tapered mold from small to large, at fixed distances in turn, fix the proximal support section at the small end of the tapered mold, and fix the distal support section at the large end of the tapered mold , at least one intermediate support segment is fixed between the small end and the large end of the conical die, and the arc segments included in each group of support segments are dislocated and symmetrically arranged;

Processing Pebax material as the outer layer of the flare;

Fixing the inner layer of the bell mouth, each group of support sections and the outer layer of the bell mouth;

The distal end of the pushing device is inserted into the conveying pipeline and the bell mouth and connected with the large mouth end of the bell mouth.

The present invention further provides a method for using a suction device, including using any of the suction devices described above, and the specific use steps are as follows:

using the guiding catheter to transport the suction device to the intravascular lesion;

Pushing the bell mouth toward the distal end of the pushing device, until the pushing device pushes the bell mouth out of the delivery pipeline and fits with the inner wall of the blood vessel;

separating the pushing device from the large mouth end of the bell mouth, and removing the pushing device;

Suction is performed by applying a suction force to the suction instrument through the proximal end of the delivery line.

Compared with the prior art, the invention provides a suction device and a method for making and using the suction device with the following beneficial effects:

The invention provides a suction device, comprising a conveying pipeline, a pushing device and a bell mouth whose size can be adaptively adjusted in a radial direction; wherein, the small mouth end of the bell mouth is connected to the distal end of the conveying pipeline; The pushing device extends into the conveying line and the inside of the bell mouth through the proximal end of the conveying line, and the distal end of the pushing device is detachably connected to the large mouth end of the bell mouth, and the pushing device The device is configured to drive the bell mouth to move in the axial direction of the conveying pipeline. In the present invention, by keeping the suction device in a force-contracted state during the delivery process, the overall size and delivery resistance of the suction device during the delivery process are reduced, so that the suction device can be easily transported to the lesion. When the suction device reaches the lesion, the bell mouth is pushed out of the force range by pushing the pushing device, so that the bell mouth gradually expands into a horn shape without radial force. During the expansion process, it can automatically adjust the size according to the size of the inner wall of the blood vessel, and finally achieve the effect of sticking to the inner wall of the blood vessel, thus ensuring that there is no other channel for blood and thrombus in the blood vessel during the subsequent suction process, and only through the delivery pipeline. outflow, thereby reducing the possibility of thrombus escaping from the lesion. At the same time, when the suction device is used for thrombus suction, since the bell mouth is close to the inner wall of the blood vessel, there is no gap between the bell mouth and the inner wall of the blood vessel, so the suction device is under the same suction pressure. There is no pressure loss, thereby increasing the suction pressure difference of the suction device, so that the suction device can completely suck all the large and small thrombi during the suction process, further reducing the possibility of other blood vessel embolism caused by the escape of the thrombus.

The use method of the suction device provided by the present invention is to use the above-mentioned suction device, and the above-mentioned suction device manufactured by using the method for manufacturing the suction device provided by the present invention all perform suction work through the suction device, so at least the same The technical effects will not be repeated here.

Description of drawings

1 is a schematic structural diagram of a suction device provided by an embodiment of the present invention when the bell mouth is in a contracted state;

2 is a schematic structural diagram of the bell mouth of the suction device provided in an embodiment of the present invention when it is in a semi-expanded state;

3 is a schematic structural diagram of the bell mouth of the suction device provided in an embodiment of the present invention when the bell mouth is in an expanded state;

4 is a schematic diagram of a process of sucking a thrombus with a suction device according to an embodiment of the present invention;

Among them, the reference numerals are as follows:

100-delivery pipeline, 200-flare mouth, 201-support structure, 400-pushing device, 401-electrolysis point, 500-vascular, 600-thrombus.

Detailed ways

The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. The advantages and features of the present invention will become more apparent from the following description. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. It should be understood that the drawings in the specification do not necessarily show specific structures of the invention to scale and that the illustrative features in the drawings for illustrating certain principles of the invention may also be shown in somewhat simplified representation. The specific design features of the invention disclosed herein, including, for example, the specific dimensions, orientations, locations, and profiles will be determined in part by the specific intended application and use environment. In addition, in the embodiment described below, the same reference numerals are used in common between different drawings to denote the same parts or parts having the same function, and repeated description thereof may be omitted. In this specification, like numerals and letters are used to refer to like items, so once an item is defined in one figure, it need not be discussed further in subsequent figures.

Example 1

This embodiment provides a suction device. Specifically, please refer to Figures 1 to 3, wherein Figure 1 is a schematic structural diagram of the suction device provided by an embodiment of the present invention when the bell mouth is in a contracted state; Figure 2 is a Figure 3 is a schematic structural diagram of the bell mouth of the suction device provided by an embodiment of the present invention when the bell mouth is in a semi-expanded state; It is obvious that the suction device includes a delivery pipeline 100 , a pushing device 400 and a bell mouth 200 whose size can be adaptively adjusted in the radial direction; wherein, the small mouth end of the bell mouth 200 is connected to the The distal end; the pusher 400 extends into the delivery line 100 and the inside of the bell mouth 200 through the proximal end of the delivery line 100, and the distal end of the pusher 400 is detachable with the horn The large mouth end of the mouth 200 is connected, and the pushing device 400 is configured to drive the bell mouth 200 to move along the axial direction of the conveying pipeline 300 .

In this way, the present invention maintains the suction device in a force-contracted state during the delivery process, so that the overall size and delivery resistance of the suction device during the delivery process are reduced, which facilitates the delivery of the suction device to the lesion. After the suction device reaches the lesion, the bell mouth 200 is pushed out of the force range by pushing the pushing device 400, so that the bell mouth 200 gradually expands into a horn shape without radial force. During the expansion process, the bell mouth 200 can automatically adjust the size according to the size of the inner wall of the blood vessel 500 and finally achieve the effect of being close to the inner wall of the blood vessel 500, thus ensuring that there is no other channel for the blood and the thrombus 600 in the blood vessel 500 to go during the subsequent suction process. It can only flow out through the suction device, thereby reducing the possibility of the thrombus 600 at the lesion escaping. At the same time, when the thrombus 600 is sucked by the suction device, since the bell mouth 200 is close to the inner wall of the blood vessel 500, there is no space between the bell mouth 200 and the inner wall of the blood vessel 500, so the suction device is in the There is no pressure loss under the same suction pressure, thereby increasing the suction pressure difference of the suction device, so that the suction device can completely suck all the large and small thrombi during the suction process, further reducing the escape of the thrombus 600 and causing other blood vessels. 500 chance of embolism.

Preferably, the bell mouth 200 includes an elastic body and a support structure 201 disposed in the elastic body; wherein, the support structure 201 is configured to make the elastic body trumpet-shaped when no external force acts. Therefore, when the bell mouth 200 is expanded into a horn shape, and the suction device starts to absorb the thrombus 600, the support structure 201 can provide a supporting force for the bell mouth 200 to ensure that the bell mouth 200 is in the The thrombus 600 suction process can maintain a stable state. In one of the preferred embodiments, the material of the elastic body includes: polytetrafluoroethylene, polyamide, polyurethane, polyether block amide and/or silicone rubber and other elastic materials, so that the bell mouth 200 is only The shape can be adaptively adjusted in the radial direction.

Please continue to refer to FIG. 1 to FIG. 3 , it can be seen from the figures that the support structure 201 includes a set of distal support sections, a set of proximal support sections, and a set of support sections disposed on the distal support section and the proximal support section At least one set of intermediate support segments between the segments, each set of support segments includes at least two arc segments with equal radii and arc lengths; wherein, the distal support segment is located at the large mouth end of the bell mouth 200, and the proximal support segment The end support segment is located at the small mouth end of the bell mouth 200; the radius and arc length of the circular arc segment of the distal support segment are greater than the radius and arc length of the circular arc segment of the intermediate support segment, and the The radius and arc length of the circular arc segment are greater than the radius and arc length of the circular arc segment of the proximal support segment. From the large mouth end to the small mouth end of the bell mouth 200, the radius and The arc lengths decrease in turn; the arc segments of any group of the support segments are dislocated and symmetrically arranged along the axial direction of the bell mouth 200 , and form an unclosed ring when there is no radially inward force. . In one of the preferred embodiments, the material of the support structure 201 includes: nickel-titanium alloy and/or stainless steel, wherein the metal wire made of nickel-titanium alloy can be formed into different arc radii by laser cutting, Preferably, the metal wire is cut into semi-circular arc segments, and then subjected to high temperature heat setting treatment to maintain its shape memory performance. Since the two wire arc segments in any of the supporting segments form a non-complete circle and have certain elasticity, when the suction device reaches the lesion, the bell mouth 200 is pushed along the axis by the pushing device 400 . Pushing forward, the bell mouth 200 is turned over and opened step by step, and the shape of the bell mouth 200 is changed from FIG. 1 to FIG. 2 and finally transformed into the horn shape of FIG. 3 . And when the radius of the inner wall of the blood vessel 500 is greater than the radius of the arc segment of the metal wire, the arc segment of the metal wire reaches the given radian, which is its maximum opening angle. At this time, there is no tension on the arc segment of the metal wire, and its The function is to gradually open the bell mouth 200 to realize the gradual transition from small to large of the bell mouth 200; when the radius of the inner wall of the blood vessel 500 is smaller than the radius of the arc of the wire, the wire is compressed and an outward tension is generated. To make the metal wire close to the inner wall of the blood vessel 500, the tension of the fit can be adjusted by adjusting the size of the arc radius. Therefore, in this embodiment, by changing the arc radius of the metal wire, it can flexibly expand and contract in accordance with the size of the inner wall of the blood vessel 500 , so as to be close to the inner wall of the blood vessel 500 .

Preferably, the radius of the arc segment included in the distal support segment is greater than the radius of the inner wall of the blood vessel 500 . According to the Hagen-Poiseuille Law, the volume flow is proportional to the specific pressure drop and the fourth power of the tube radius, Q=π×r^4×Δp/(8ηL), so when the bell mouth 200 is opened from the inner wall of the compliant blood vessel 500, The radius of the large mouth end of the bell mouth 200 reaches the maximum value. The distal support segment made of metal wire includes two arc segments, which conform to the radius size of the inner wall of the blood vessel 500 and are close to the inner wall of the blood vessel 500 due to tension, so that during negative pressure suction, there is no pressure loss, and suction is possible. The pressure difference is maximized, thereby facilitating thrombus 600 aspiration. In one of the preferred embodiments, the radius of the circular arc segment included in the proximal support segment is the same as the radius of the delivery pipeline 100 . In this way, a smooth transition from the inner wall of the delivery pipeline 100 to the inner wall of the bell mouth 200 is achieved, and the smooth removal of the thrombus 600 is ensured.

Preferably, the pushing device 400 includes at least two pushing rods, the distal ends of the two pushing rods and the large mouth end of the bell mouth 200 are detachably connected, and the pushing rods are about the middle of the bell mouth 200 . Axial symmetry. This arrangement ensures that when the bell mouth 200 is pushed out of the conveying pipeline 100 by the push rod, the bell mouth 200 is evenly stressed, and at the same time, it is turned outward to expand into a horn shape. It should be further noted that the push rod is made of nickel-titanium alloy, stainless steel, nylon and other materials. Each of the shrinking rods may be composed of monofilament or multifilament, preferably monofilament.

Preferably, it also includes an electrolytic decoupling and separation device, and an electrolytic decoupling point 401 is provided where the distal ends of the two push rods are connected to the bell mouth 200, and the electrolytic decoupling and separation device is used to separate the two push rods from the bell mouth 200. The bell mouth 200 is disengaged at the electrolytic disengagement point 401 . Therefore, after the bell mouth 200 is expanded into a trumpet shape, before the suction instrument starts to perform the thrombectomy operation, by removing the push rod, the influence of the push rod volume on the inner cavity volume can be reduced, so that the delivery tube can be removed. The lumen of the road 100 reaches the maximum value and the lumen is smooth, which reduces the resistance during the delivery of the blood clot. It should be further noted that, the method of removing the push rod from the bell mouth 200 by the electrolytic separation device is not unique, and the present invention can also remove the push rod by mechanical release.

Preferably, the outer wall of the conveying pipeline 100 and/or the bell mouth 200 further includes a lubricating layer. Thus, the frictional force generated when the delivery line 100 is pushed out of the guide catheter or the suction instrument is withdrawn from the blood vessel 500 can be reduced. Wherein, the lubricating layer includes: water-soluble macromolecules, water-based surfactants, water-based binders and deionized water. The water-soluble macromolecules are polyacrylamide, polyvinylpyrrolidone, polyethylene glycol, and polyvinylpyrrolidone solution is preferred. The lubricating layer can be applied by spraying, dipping, brushing or the like.

Embodiment 2

The present embodiment provides a method for making a suction device, including making the above-mentioned suction device, and the specific fabrication steps are as follows:

Utilize a tapered mold to process a layer of PTFE material as the inner layer of the bell mouth 200;

Along the direction of the tapered mold from small to large, at fixed distances in turn, fix the proximal support section at the small end of the tapered mold, and fix the distal support section at the large end of the tapered mold , at least one intermediate support segment is fixed between the small end and the large end of the conical die, and the arc segments included in each group of support segments are dislocated and symmetrically arranged;

Process the Pebax material as the outer layer of the bell mouth 200;

Fixing the inner layer of the bell mouth 200, each group of support sections and the outer layer of the bell mouth 200;

The distal end of the pushing device 400 is inserted into the delivery pipeline 100 and the bell mouth 200 and connected with the large mouth end of the bell mouth 200 .

Since the manufacturing method provided by the present invention is used to manufacture the suction device, the manufactured suction device has at least the same technical effect, and details are not repeated here.

In one of the preferred embodiments, 5 groups of support sections with different lengths and radii will be used. Specifically, please refer to Figure 3 and the following table:

Table 1: Length and arc radius values of each group of support segments

Specification number Length(mm) Arc radius (mm) Fifth support section 5 1.5 Fourth support section 6 2 third support section 7 2.5 second support section 8 3 first support section 9 3.5

In this embodiment, each support segment includes 2 wire arc segments with the same length and arc radius, and a total of 10 wire arc segments. The manufacturing method of the suction device includes: using a tapered mold to process a layer of PTFE material as the inner layer of the bell mouth 200, and then along the direction of the tapered mold from small to large, the two sides are spaced a fixed distance in turn, and the dislocation is symmetrically fixed. 5mm, 6mm, 7mm, 8mm, 9mm Nitinol wire. After completion, the Pebax material is processed as the outer layer of the bell mouth 200, and then the three-layer structure is fixed by a thermoplastic method using a heat drying gun. Then, 1 ml of polyvinylpyrrolidone (PVP) lubricating solution is evenly coated on the outer layer of the delivery pipeline 100 and the bell mouth 200 by using a micropipette, and placed in a fume hood for drying, that is, Complete outer coating. The fifth support section is the proximal support section, and the radius of the fifth support section is associated with the radius of the delivery pipeline 100 , so that a smooth transition from the inner wall of the delivery pipeline 100 to the bell mouth 200 is achieved. Then take two nickel-titanium alloy filaments with a diameter of 0.2 mm as the pushing device 400, the two pushing wires are distributed symmetrically, and the distal ends of the two pushing wires are fixed on the large mouth end of the bell mouth 200, and have Electrolytic de-separation device. When the finished suction device is transported to the lesion site in the blood vessel 500 , the push wire is used to push the large mouth end of the bell mouth 200 to complete the opening of the bell mouth 200 , as shown in FIG. 3 . After the bell mouth 200 is completely placed at the designated position, the push wire and the large mouth end of the bell mouth 200 are detached and separated by electrolysis, and the push wire is removed, thereby increasing the inner cavity volume of the conveying part and reducing the conveying process. resistance in. And a suction pump is connected to the proximal end of the conveying pipeline 100, and the suction negative pressure value is given. At this time, the suction port area and pressure drop are both larger, so that the suction flow and suction force are both larger. It is larger and facilitates the smooth extraction of the blood clot in the blood vessel 500 . After the suction is completed, the suction device is retracted. Since the bell mouth 200 can adapt to the size of the blood vessel 500 and the radius of the blood vessel 500 in the retraction path is gradually increased, the suction device can be easily retracted.

Embodiment 3

The present embodiment provides a method of using a suction device, and the specific use steps are as follows:

using the guiding catheter to transport the suction device to the intravascular lesion;

Pushing the bell mouth 200 toward the distal end of the pushing device 400 until the pushing device 400 pushes the bell mouth 200 out of the delivery pipeline 100 and fits with the inner wall of the blood vessel;

Separate the pushing device 400 from the large mouth end of the bell mouth 200, and remove the pushing device 400;

A suction force is applied to the suction instrument through the proximal end of the delivery line 100 for suction.

Since the use method provided by the present invention uses the above-mentioned suction device to perform the suction work, it has at least the same technical effect, and will not be repeated here.

Please refer to FIG. 4 . FIG. 4 is a schematic diagram of the process of sucking a thrombus by a suction device according to an embodiment of the present invention; in one of the preferred embodiments, the test will be performed in the internal carotid artery vessel 500 model, and the simulated artery diameter is 5mm. First, use the guiding catheter to establish a passage, and transport the suction device for the clot in the blood vessel 500 to the lesion site containing the clot, leaving a distance of 3-5mm (such as 4A) from the lesion site. Push the push rod made of nickel-titanium alloy wire in the end direction, so that the bell mouth 200 is completely opened, and the large mouth end of the bell mouth 200 is adaptively attached to the internal carotid artery. Because the radius of the arc segment included in the third support segment is equal to the radius of the inner wall of the blood vessel 500, from the first support segment to the third support segment, the maximum radius of the bell mouth 200 is equal to the radius of the blood vessel 500 (eg, 4B). . Then, connect the electrolysis device to the push rod, and wait for 1 to 2 minutes until the bell mouth 200 is successfully separated from the push rod, and then withdraw the push rod (eg, 4C). The proximal end of the delivery pipeline 100 is connected to a suction pump, and under negative pressure, the blood clot passes through the bell mouth 200 with the blood flow, enters the delivery pipeline 100, and is drawn out of the body (eg, 4D). The delivery catheter is then withdrawn from the body. In this embodiment, the thrombus 600 can be completely sucked out from the lesion, avoiding the escape of the broken thrombus.

The use method of the suction device provided by the present invention is to use the above-mentioned suction device, and the above-mentioned suction device manufactured by using the method for manufacturing the suction device provided by the present invention all perform suction work through the suction device, so at least the same The technical effects will not be repeated here.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example.

To sum up, in the present invention, by maintaining the suction device in a force-contracted state during the delivery process, the overall size and delivery resistance of the suction device during the delivery process are reduced, which facilitates the delivery of the suction device to the lesion. After the suction device reaches the lesion, the bell mouth 200 is pushed out of the force range by pushing the pushing device 400, so that the bell mouth 200 gradually expands into a horn shape without radial force. During the expansion process, the bell mouth 200 can automatically adjust the size according to the size of the inner wall of the blood vessel 500 and finally achieve the effect of being close to the inner wall of the blood vessel 500, thus ensuring that there is no other channel for the blood and the thrombus 600 in the blood vessel 500 to go during the subsequent suction process. It can only flow out through the suction device, thereby reducing the possibility of the thrombus 600 at the lesion escaping. At the same time, when the thrombus 600 is sucked by the suction device, since the bell mouth 200 is close to the inner wall of the blood vessel 500, there is no space between the bell mouth 200 and the inner wall of the blood vessel 500, so the suction device is in the There is no pressure loss under the same suction pressure, thereby increasing the suction pressure difference of the suction device, so that the suction device can completely suck all the large and small thrombi during the suction process, further reducing the escape of the thrombus 600 and causing other blood vessels. 500 chance of embolism.

The use method of the suction device provided by the present invention is to use the above-mentioned suction device, and the above-mentioned suction device manufactured by using the method for manufacturing the suction device provided by the present invention all perform suction work through the suction device, so at least the same The technical effects will not be repeated here.

The above are only preferred embodiments of the present invention, and do not have any limiting effect on the present invention. Any person skilled in the art, within the scope of not departing from the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, all belong to the technical solution of the present invention. content still falls within the protection scope of the present invention.

Claims (10)

1. An absorbing apparatus is characterized by comprising a conveying pipeline, a pushing device and a bell mouth with the size capable of being adaptively adjusted along the radial direction;

the small-mouth end of the horn mouth is connected with the far end of the conveying pipeline;

pusher passes through conveying pipeline's near-end stretches into conveying pipeline with inside the horn mouth, just pusher's distal end detachable with the macrostoma of horn mouth end is connected, pusher is configured to drive the horn mouth is followed conveying pipeline's axial displacement.

2. The suction instrument of claim 1, wherein the flare includes an elastomeric body and a support structure disposed within the elastomeric body;

wherein the supporting structure is configured to enable the elastic body to be horn-shaped when no external force acts on the elastic body.

3. The suction device of claim 2, wherein the support structure comprises a set of distal support segments, a set of proximal support segments, and at least one set of intermediate support segments disposed between the distal support segments and the proximal support segments, each set of support segments comprising at least two arc segments of equal radius and arc length;

the far-end supporting section is positioned at the large-opening end of the bell mouth, and the near-end supporting section is positioned at the small-opening end of the bell mouth;

the radius and the arc length of the arc section of the far-end support section are greater than those of the arc section of the middle support section, the radius and the arc length of the arc section of the middle support section are greater than those of the arc section of the near-end support section, and the radius and the arc length of the arc section of the middle support section are sequentially reduced from the large-opening end to the small-opening end of the horn mouth;

the circular arc sections of any group of the supporting sections are symmetrically arranged along the axial direction of the bell mouth in a staggered mode, and an unclosed circular ring is formed when no radially inward acting force exists.

4. The suction device as claimed in claim 3, wherein said distal support section comprises a circular arc section having a radius greater than a radius of an inner wall of the blood vessel.

5. The suction device as claimed in claim 2, wherein said elastic body is made of a material comprising: polytetrafluoroethylene, polyamide, polyurethane, polyether block amide and/or silicone rubber; the material of bearing structure includes: nickel titanium alloy and/or stainless steel.

6. The suction instrument as claimed in claim 1, wherein said pushing means comprises at least two pushing rods, distal ends of said two pushing rods are detachably connected to a major-mouth end of said flared mouth, and said pushing rods are symmetrical about a central axis of said flared mouth.

7. The suction apparatus as claimed in claim 6, further comprising an electrolytic detachment means, wherein an electrolytic detachment point is provided at a connection between the distal ends of the two pushing rods and the bell mouth, and the electrolytic detachment means is configured to detach the two pushing rods from the electrolytic detachment point.

8. The suction device as claimed in claim 1, wherein the outer wall of the delivery line and/or the bell mouth is further provided with a lubricating layer.

9. A method for manufacturing an absorbing device, which is characterized by comprising the following steps of manufacturing the absorbing device according to any one of claims 3 to 5:

processing a layer of PTFE material by using a conical die to serve as an inner layer of the bell mouth;

sequentially spacing fixed distances along the direction from small to large of the conical mould, fixing the near-end supporting section at the small end of the conical mould, fixing the far-end supporting section at the large end of the conical mould, fixing at least one middle supporting section between the small end and the large end of the conical mould, and arranging the arc sections of each group of supporting sections in a staggered and symmetrical manner;

processing a Pebax material as an outer layer of the bell mouth;

fixing the inner layer of the bell mouth, each group of support sections and the outer layer of the bell mouth;

and extending the far end of the pushing device into the conveying pipeline and the bell mouth and connecting the far end of the pushing device with the large opening end of the bell mouth.

10. A method of using an aspiration device, comprising using the aspiration device of any one of claims 1-8, comprising the steps of:

delivering the aspiration device to an intravascular lesion using a guide catheter;

pushing the bell mouth towards the far end direction of the pushing device until the pushing device pushes the bell mouth out of the conveying pipeline and is attached to the inner wall of the blood vessel;

separating the pushing device from the large-opening end of the bell mouth, and removing the pushing device;

suction is applied to the suction instrument through the proximal end of the delivery tube.

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