CN214157448U

CN214157448U - Thrombus taking device

Info

Publication number: CN214157448U
Application number: CN202022946325.2U
Authority: CN
Inventors: 李涛; 田梦云; 叶丽珍
Original assignee: Shanghai Puhui Medical Equipment Co ltd
Current assignee: Shanghai Puhui Medical Equipment Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-09-10
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a get and tie device belongs to mechanical technical field. The utility model discloses a get and tie device. The utility model provides a thrombus taking device, which comprises a handle, a pushing device and a thrombus taking support, wherein the pushing device comprises a guide wire and a hypotube wrapped outside the guide wire, the far end of the guide wire is of a sharpening structure, and a spring ring is arranged at one end of the guide wire, which extends out of a shell from a handle head and extends to pass through the thrombus taking support, so that the part of the thrombus taking device, which is in contact with the inner wall of a blood vessel, has excellent flexibility and is not easy to damage the inner wall of the blood vessel; the hypotube is a four-way hypotube made of high-elasticity shape memory alloy, can smoothly pass through a tortuous blood vessel, and enables the thrombus removal device to reach a distal thrombus removal device of a diseased region without the assistance of a catheter.

Description

Thrombus taking device

Technical Field

The utility model relates to a get and tie device belongs to mechanical technical field.

Background

Acute stroke is the third leading cause of death today and is the leading cause of disability in adults, with ischemic stroke accounting for about 85% of acute stroke. Ischemic stroke is mainly caused by embolization of larger vessels (diameter >2mm), and the lethality of embolization of larger vessels is 53% -92%. It can be seen that ischemic stroke is a disease with high morbidity, disability rate and mortality.

At present, the methods which are proved to be effective in treating ischemic stroke by medicine mainly comprise medicinal thrombolysis and mechanical thrombus removal. The method mainly comprises the steps of placing the medicine at a pathological position by using a catheter and then releasing the medicine to form a high medicine concentration locally, wherein the rt-PA activates plasminogen to become plasmin-dissolving blood clots through plasminogen arginine-valine so as to achieve the purpose of thrombolysis. However, the actual thrombolysis rate of this method is low. The drug thrombolysis treatment rate of developed countries is only 4.1-6.3%, and the thrombolysis treatment rate of China is lower. Therefore, drug thrombolysis has not been able to fully meet clinical needs.

The mechanical thrombus removal is mainly realized by the steps of puncturing the femoral artery, enabling a thrombus removal device to reach a position of blood vessel occlusion through the blood vessel, then enabling the thrombus to pass through the occluded blood vessel, and removing the thrombus through the thrombus removal device or a thrombus removal catheter, so that the blood flow of the blood vessel is recovered, and the purpose of thrombus removal is achieved. Compared with the medicine thrombolysis, the mechanical thrombolysis obviously improves the blood vessel recanalization rate.

Mechanical thrombectomy devices can be divided into proximal thrombectomy devices (located proximal to the thrombus) and distal thrombectomy devices (located distal to the thrombus), depending on the location of placement. The proximal thrombus taking device mainly comprises a thrombus taking suction catheter, and the distal thrombus taking device mainly comprises a capturing thrombus taking device and a rotary cutting thrombus taking device. Currently, the commercially available distal embolectomy devices mainly include Merci embolectomy devices (Concentric, Mountain view. calif.), Catchdevice (Bah Extrusion, montmorency. france), InTime and attacter devices (Boston Scientific, nature, Mass.), and Phenox embolectomy devices (Phenox, bochmum, germann). However, the existing distal embolectomy devices are easy to damage the inner wall of the blood vessel, and the risk of reperfusion injury of the blood vessel during mechanical embolectomy is greatly increased. In addition, the existing distal thrombus removal device has many defects, for example, after the thrombus removal stent of the existing distal thrombus removal device expands at a lesion position, the expanded size of the thrombus removal stent cannot be controlled according to the size of a lesion blood vessel; the existing distal thrombus taking device can not judge the state of the thrombus taking bracket in the body; the distal end of a thrombus taking bracket of the existing distal end thrombus taking device is in an open state, so that thrombus is easy to escape and fall off; the thrombectomy stents of the prior distal thrombectomy devices require catheter assistance to reach the lesion site.

Therefore, it is urgently needed to design a far-end thrombus taking device which is not easy to damage the inner wall of a blood vessel, has controllable expansion size of the thrombus taking stent, can be developed, can effectively prevent thrombus from escaping, and can reach a diseased region without the assistance of a catheter so as to overcome the defects of the existing far-end thrombus taking device.

SUMMERY OF THE UTILITY MODEL

[ problem ] to

The to-be-solved technical problem of the utility model is to provide a difficult damage blood vessel inner wall, it is controllable to embolia getting support expansion size, can develop, can effectively prevent the thrombus escape to, can arrive the distal end thrombi taking device at pathological change position under the supplementary condition of pipe need not.

[ solution ]

In order to solve the problems, the utility model provides a thrombus taking device, which comprises a handle 1, a pushing device 2 and a thrombus taking bracket 3;

the handle 1 comprises a shell 4, a moving block 5, a core rod 6 and an adjuster 7; the housing 4 comprises a crown 8 and a tang 9; the crown 8 and the tail 9 are connected through a plurality of tracks 10; the moving block 5 is positioned between the crown 8 and the shank tail 9, and a plurality of first bulges 11 and a plurality of second bulges 12 are arranged on the moving block 5; the first protrusion 11 is engaged with the track 10, so that the moving block 5 can slide on the track 10; the second bulge 12 is provided with threads; one end of the core rod 6 is inserted into the crown 8, and the other end of the core rod is inserted into the moving block 5, so that the moving block 5 can slide on the track 10 along the core rod 6; the adjuster 7 is in a cylindrical shape with openings at two ends, the adjuster 7 is wrapped on the outer sides of the track 10 and the moving block 5, and the inner wall of the adjuster 7 is provided with threads matched with the second protrusions 12, so that the moving block 5 can slide on the track 10 along the core rod 6 along with the rotation of the adjuster 7;

the pushing device 2 comprises a guide wire 13 and a hypotube 14; one end of the guide wire 13 is fixed on the core rod 6, and the other end of the guide wire extends out of the shell 4 from the crown 8 and extends to penetrate through the thrombus taking support 3; the hypotube 14 is wrapped outside the guide wire 13, so that the guide wire 13 can move in the hypotube 14, one end of the hypotube 14 is fixed on the moving block 5, and the other end of the hypotube 14 extends out of the shell 4 from the handle head 8 and extends to the embolectomy support 3;

the proximal end of the thrombus removal support 3 is fixed on the hypotube 14, and the distal end of the thrombus removal support 3 is fixed on the guide wire 13, so that the thrombus removal support 3 can expand and contract along with the sliding of the moving block 5.

In one embodiment of the present invention, the guide wire 13 extends from the crown 8 out of the housing 4 and extends to an end through the thrombectomy support 3 where it is provided with a spring ring 15.

In an embodiment of the present invention, both ends of the spring ring 15 are respectively welded or optically fixed on the guide wire 13 by using an optically fixed adhesive, and the welded or optically fixed part is smooth and burr-free, and the maximum outer diameter of the welded or optically fixed part does not exceed the outer diameter of the spring ring 15.

In one embodiment of the present invention, the spring ring 15 has a conical bottom at the proximal end and a circular arc at the distal end.

In one embodiment of the present invention, the spring ring 15 is made of platinum-nickel alloy.

In one embodiment of the present invention, the spring ring 15 has a length of 12mm, an outer diameter of 0.25mm and an inner diameter of 0.16 mm.

In one embodiment of the present invention, the guide wire 13 is provided with a first developing ring 16 and a second developing ring 17; the first developing ring 16 is positioned at the joint of the distal end of the embolectomy bracket 3 and the guide wire 13; the second developer ring 17 is located at the junction of the proximal end 3 of the thrombectomy stent and the distal end 14 of the hypotube.

In one embodiment of the present invention, the first developing ring 16 and the second developing ring 17 are made of a platinum-iridium alloy material; the first developing ring 16 is welded or optically fixed on the distal end of the thrombus removal support 3 and the guide wire 13 by using an optical fixing glue; the second developing ring 17 is welded or optically fixed on the proximal end of the bolt taking bracket 3 by using an optical fixing glue.

In one embodiment of the present invention, the maximum outer diameter of the first and second developing

rings

16 and 17 is not more than 0.64 mm.

In one embodiment of the present invention, the thrombus removal device comprises a scale ring 18; the scale ring 18 is wrapped around the track 10 and the moving block 5, and the scale ring 18 is located between the shank tail 9 and the adjuster 7.

In an embodiment of the present invention, the number of the rails 10 is two, and the two rails 10 are disposed 180 ° opposite to each other.

In one embodiment of the present invention, the thrombus removal support 3 is a mesh structure.

In one embodiment of the present invention, the thrombectomy stent 3 is woven from 48 ingots of nickel-titanium shape memory alloy round wire with a wire diameter of 0.04mm, and the weaving density is 45PPI at the head end and 57PPI at the middle section.

In one embodiment of the present invention, the thrombectomy support 3 is woven with 2 pieces of 48 ingots of nickel-titanium shape memory alloy round wire with a wire diameter of 0.04 mm.

In an embodiment of the present invention, the thrombectomy support 3 is formed by weaving 48 ingots of nickel-titanium shape memory alloy round wire with a wire diameter of 0.04mm with 2 pieces, and 2-3 pieces of the 48 ingots of nickel-titanium shape memory alloy round wire are replaced with platinum tungsten wire.

In one embodiment of the present invention, the platinum tungsten wire is a developable platinum tungsten wire.

In one embodiment of the present invention, the platinum tungsten wire is PtW 8% platinum tungsten wire.

In an embodiment of the present invention, the length of the thrombus removal support 3 in the contracted state is 4cm, and the length in the expanded state is 3 cm.

In one embodiment of the present invention, the radial support force of the thrombectomy stent 3 remains constant during expansion.

In one embodiment of the present invention, the thrombectomy stent 3 has heparin coatings on both the inner and outer surfaces.

In one embodiment of the present invention, the hypotube 14 is a four-way hypotube formed by laser cutting a high elastic shape memory alloy tube.

In one embodiment of the present invention, the high elasticity shape memory alloy tube is a high elasticity nickel titanium shape memory alloy tube.

In one embodiment of the present invention, the hypotube 14 has an outer diameter of 0.38mm and an inner diameter of 0.15 mm.

In one embodiment of the present invention, the length of the hypotube 14 is 200 cm.

In an embodiment of the present invention, the cutting length of the hypotube 14 is 45cm, the outer diameter is 0.38mm, the inner diameter is 0.15mm, and the outer tube length is 200 cm.

In an embodiment of the present invention, the distal end of the guide wire 13 is a sharpened structure.

In one embodiment of the present invention, the guide wire 13 is made of SS304 stainless steel.

In an embodiment of the present invention, the maximum wire diameter of the guide wire 13 is 0.14mm, and the minimum wire diameter is 0.08 mm.

In one embodiment of the present invention, the length of the guide wire 13 is 210 cm.

In one embodiment of the present invention, the 200cm surface of the proximal end of the guide wire 13 has a hydrophobic coating.

In an embodiment of the present invention, the thickness of the hydrophobic coating is 0.004-0.010 mm.

In one embodiment of the invention, the hydrophobic coating is a green PTFE hydrophobic coating.

In one embodiment of the present invention, a portion of the surface of the non-sharpened structure within 10cm of the distal end of the guidewire 13 has a hydrophilic coating.

In an embodiment of the present invention, the thickness of the hydrophilic coating is 0.004-0.010 mm.

In one embodiment of the present invention, the hydrophilic coating is a PVP polyvinylpyrrolidone hydrophilic coating.

In one embodiment of the present invention, the surface of the spring ring 15 has a hydrophilic coating.

In an embodiment of the present invention, the moving distance of the moving block 5 is 0-10 mm.

[ advantageous effects ]

(1) The utility model provides a thrombus taking device, which comprises a handle, a pushing device and a thrombus taking support, wherein the pushing device comprises a guide wire and a hypotube wrapped outside the guide wire, the far end of the guide wire is of a sharpening structure, and the guide wire extends out of a shell from a handle head and is provided with a spring ring at one end extending through the thrombus taking support, so that the part of the thrombus taking device contacting with the inner wall of a blood vessel has excellent flexibility and is not easy to damage the inner wall of the blood vessel; the hypotube is a four-way hypotube made of high-elasticity shape memory alloy, can smoothly pass through a tortuous blood vessel, and enables the thrombus removal device to reach a distal thrombus removal device of a diseased region without the assistance of a catheter.

(2) The utility model provides a thrombectomy device, thrombectomy device contains handle, pusher and thrombectomy support, the handle includes the regulator, the core bar, the track to and, can be along with the rotation of regulator, along the gliding movable block of core bar on the track, pusher's seal wire's one end is fixed on the core bar, and the other end stretches out the shell from the crown and extends to passing thrombectomy support, pusher's hypotube one end is fixed on the movable block, and the other end stretches out the shell from the crown and extends to thrombectomy support, thrombectomy support near-end is fixed on the hypotube, the distal end is fixed on the seal wire for thrombectomy device can be through the regulator of rotatory handle, the size of control thrombectomy support to agree with the blood vessel inner wall size to and, the radial holding power of regulation and control thrombectomy support to the blood vessel inner wall.

(3) The utility model provides a thrombectomy device, thrombectomy device contains handle, pusher and thrombectomy support, thrombectomy support is worked out by the 46 ~ 47 spindle nickel titanium shape memory alloy round wires that the silk footpath is 0.04mm and the platinum tungsten round wires that 2 ~ 3 can develop and forms, be equipped with first development ring and second development ring on pusher's the seal wire for thrombectomy device is whole to be developed, can judge and embolise the state and the position of support in the blood vessel.

(4) The utility model provides a thrombectomy device, thrombectomy device contains handle, pusher and thrombectomy support, thrombectomy support is for being 46 ~ 47 spindle nickel titanium shape memory alloy round wire and the platinum tungsten round wire that 2 ~ 3 can develop by the silk footpath 45PPI of head end that the support was worked out, interlude 57 PPI's network structure for thrombectomy device is difficult to cut up the thrombus and is little to vascular damage, thrombectomy support's both ends also are the closure state, make thrombectomy device can effectively avoid the thrombus to escape in the art and drop.

(5) The utility model provides a thrombectomy device, thrombectomy support two sides of thrombectomy device all have the heparin coating, and the setting of heparin coating can prevent effectively that blood from taking the thrombus support surface formation clot, stopping up thrombectomy support, consequently, the utility model discloses thrombectomy support of thrombectomy device is difficult for taking place to block up at the in-process of thrombectomy.

(6) The utility model provides a thrombectomy device, thrombectomy device's the surface of seal wire distal end and the surface of spring coil all have hydrophilic coating, and hydrophilic coating's setting can reduce the utility model discloses to vascular frictional force when thrombectomy device's seal wire passes through the blood vessel, consequently, the utility model discloses thrombectomy device's seal wire is difficult for damaging the blood vessel.

(7) The utility model provides a thrombectomy device, there is hydrophobic coating on the surface of thrombectomy device's seal wire near-end, and hydrophobic coating's setting can effectively reduce the utility model discloses thrombectomy device's seal wire and the frictional force of hypotube outside pipe inner wall, therefore, the utility model discloses thrombectomy device's thrombectomy support is more smooth and easy at the in-process of contraction and expansion.

Drawings

FIG. 1: the utility model discloses get overall structure schematic diagram of an embodiment of bolt device.

FIG. 2: the utility model discloses get partial structure schematic diagram of an embodiment of bolt device.

FIG. 3: the utility model discloses get section structure sketch map of an embodiment of bolt device.

FIG. 4: the utility model discloses get overall structure schematic diagram of an embodiment of movable block of bolt device.

In fig. 1-4, a handle 1, a pushing device 2, a thrombus removal support 3, a housing 4, a moving block 5, a core bar 6, an adjuster 7, a handle head 8, a handle tail 9, a track 10, a first protrusion 11, a second protrusion 12, a guide wire 13, a hypotube 14, a spring ring 15, a first developing ring 16, a second developing ring 17 and a scale ring 18.

Detailed Description

The invention will be further elucidated with reference to a specific embodiment and a drawing.

Example 1: thrombus taking device

As shown in fig. 1-4, the thrombus removal device of the present invention comprises a handle 1, a pushing device 2 and a thrombus removal support 3;

Preferably, the guide wire 13 extends from the crown 8 out of the housing 4 and is provided with a spring ring 15 at one end extending through the thrombectomy stent 3.

Preferably, both ends of the spring ring 15 are respectively welded or light-cured on the guide wire 13, and the welded or light-cured part is smooth and burr-free, and the maximum outer diameter of the welded or light-cured part does not exceed the outer diameter of the spring ring 15.

Preferably, the proximal bottom of the spring ring 15 is conical, and the distal top is arc-shaped.

Preferably, the spring ring 15 is a platinum-nickel alloy material.

Preferably, the spring ring 15 has a length of 12mm, an outer diameter of 0.25mm and an inner diameter of 0.16 mm.

Preferably, a first developing ring 16 and a second developing ring 17 are arranged on the guide wire 13; the first developing ring 16 is positioned at the joint of the distal end of the embolectomy bracket 3 and the guide wire 13; the second developing ring 17 is positioned at the joint of the embolectomy stent 3 and the hypotube 14.

Preferably, the first developing ring 16 and the second developing ring 17 are made of platinum-iridium alloy material; the first developing ring 16 is welded or optically fixed on the distal end of the thrombus removal support 3 and the guide wire 13 by using an optical fixing glue; the second developing ring 17 is welded or optically fixed on the proximal end of the bolt taking bracket 3 by using an optical fixing glue.

Preferably, the maximum outer diameter of the first and second developing rings 16 and 17 is not more than 0.64 mm.

Preferably, the embolectomy device comprises a graduated ring 18; the scale ring 18 is wrapped around the track 10 and the moving block 5, and the scale ring 18 is located between the shank tail 9 and the adjuster 7.

Preferably, the number of the rails 10 is two, and the two rails 10 are arranged opposite to each other at 180 °.

Preferably, the thrombus removal support 3 is of a net structure.

Preferably, the embolectomy stent 3 is formed by weaving 48 ingots of nickel-titanium shape memory alloy round wires with the wire diameter of 0.04mm, and the weaving density is 45PPI at the head end and 57PPI at the middle section.

Preferably, the embolectomy support 3 is formed by weaving 48 ingots of nickel-titanium shape memory alloy round wires with the wire diameter of 0.04mm in a 2-lap mode.

Preferably, the embolectomy support 3 is formed by weaving 48 ingots of nickel-titanium shape memory alloy round wires with the wire diameter of 0.04mm in a 2-lap mode, and 2-3 of the 48 ingots of nickel-titanium shape memory alloy wires are replaced by platinum tungsten wires.

Preferably, the platinum tungsten wire is a developable platinum tungsten wire.

Preferably, the platinum tungsten wire is PtW 8% platinum tungsten wire.

Preferably, the length of the thrombectomy stent 3 in the contraction state is 4cm, and the length of the thrombectomy stent 3 in the expansion state is 3 cm.

Preferably, the radial support force of the embolic stent 3 remains constant during expansion.

Preferably, the inner surface and the outer surface of the thrombus removal support 3 are both provided with heparin coatings.

Preferably, the hypotube 14 is a four-way hypotube formed by laser cutting a high elastic shape memory alloy tube.

Preferably, the high-elasticity shape memory alloy tube is a high-elasticity nickel-titanium shape memory alloy tube.

Preferably, the hypotube 14 has an outer diameter of 0.38mm and an inner diameter of 0.15 mm.

Preferably, the hypotube 14 has a length of 200 cm.

Preferably, the cutting length of the hypotube 14 is 45cm, the outer diameter is 0.38mm, the inner diameter is 0.15mm, and the length of the outer tube is 200 cm.

Preferably, the distal end of the guide wire 13 is a sharpened structure.

Preferably, the guide wire 13 is made of SS304 stainless steel material.

Preferably, the guide wire 13 has a maximum wire diameter of 0.14mm and a minimum wire diameter of 0.08 mm.

Preferably, the length of the guide wire 13 is 210 cm.

Preferably, the 200cm surface of the proximal end of the guide wire 13 is provided with a hydrophobic coating.

Preferably, the thickness of the hydrophobic coating is 0.004-0.010 mm.

Preferably, the hydrophobic coating is a green PTFE hydrophobic coating.

Preferably, a part of the surface of the non-sharpened structure within 10cm of the distal end of the guide wire 13 is provided with a hydrophilic coating.

Preferably, the thickness of the hydrophilic coating is 0.004-0.010 mm.

Preferably, the hydrophilic coating is a PVP polyvinylpyrrolidone hydrophilic coating.

Preferably, the surface of the spring ring 15 has a hydrophilic coating.

Preferably, the thickness of the hydrophilic coating is 0.004-0.010 mm.

Preferably, the moving distance of the moving block 5 is 0 to 10 mm.

The utility model discloses the tolerance of each part size of thrombectomy device is 0 ~ 5%.

Example 2: embolectomy method

The thrombus removal device of example 1 was used, and the specific procedure was as follows:

when the thrombus is taken, an operator uses the microcatheter to convey the thrombus taking support to a position 2-3 cm away from the near end of a lesion position, the thrombus taking support 3 is continuously pushed to be conveyed to the lesion position, the thrombus taking support 3 penetrates through the thrombus through the spring ring 15, and the distance between the second developing ring 17 of the thrombus taking support 3 and the far end of the thrombus is 2-3 cm (the operator can adjust the position according to actual needs); an operator holds the handle tail 9 with the left hand, the right hand holds the operation adjuster 7 to rotate slowly to push the moving block 5, the moving block 5 drives the hypotube 14 to slide axially towards a pathological change direction, the hypotube 14 is fixed with the second developing ring 17, the embolectomy stent 3 can be expanded when the hypotube 14 slides axially, the operator can adjust the expanded size of the embolectomy stent 3 according to the size of a pathological change blood vessel, the embolectomy stent 3 is slowly withdrawn after the embolectomy stent 3 is adjusted to a proper size, the embolectomy stent 3 is embedded into thrombus, the thrombus is cut, thrombus fragments enter an inner cavity gap of the embolectomy stent 3 through the woven meshes of the embolectomy stent 3, and the thrombus fragments cannot flow to the far-end blood vessel through the meshes due to the fact that the woven density of the far end of the embolectomy stent 3 is only 45PPI, and therefore the far-end protection effect is achieved. The operator uses the handle 1 to move the thrombus removal support 3 out of the body, and thrombus removal is completed.

The protection scope of the present invention is not limited to the above embodiments, and any modifications, equivalent replacements, and improvements that can be made by a person skilled in the art within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The thrombus taking device is characterized by comprising a handle, a pushing device and a thrombus taking support;

the handle comprises a shell, a moving block, a core rod and an adjuster; the shell comprises a crown and a tail; the handle head and the handle tail are connected through a plurality of tracks; the moving block is positioned between the crown and the tail, and a plurality of first bulges and a plurality of second bulges are arranged on the moving block; the first bulges are matched with the track, so that the moving block can slide on the track; the second bulge is provided with threads; one end of the core rod is inserted into the crown, and the other end of the core rod is inserted into the moving block, so that the moving block can slide on the track along the core rod; the adjuster is in a cylindrical shape with openings at two ends, the adjuster is wrapped on the outer sides of the track and the moving block, and the inner wall of the adjuster is provided with threads matched with the second bulges, so that the moving block can slide on the track along the core rod along with the rotation of the adjuster;

the pushing device comprises a guide wire and a hypotube; one end of the guide wire is fixed on the core rod, and the other end of the guide wire extends out of the shell from the crown and extends to penetrate through the thrombus taking support; the hypotube is wrapped outside the guide wire, so that the guide wire can move in the hypotube, one end of the hypotube is fixed on the moving block, and the other end of the hypotube extends out of the shell from the handle head and extends to the thrombus removal support;

the proximal end of the thrombus removal support is fixed at the distal end of the hypotube, and the distal end of the thrombus removal support is fixed on the guide wire, so that the thrombus removal support can expand and contract along with the sliding of the moving block.

2. The embolectomy device of claim 1, wherein the end of the guidewire extending from the crown out of the housing and through the embolectomy stent is provided with a coil spring.

3. The embolectomy device of claim 1, wherein the guidewire is provided with a first visualization ring and a second visualization ring; the first developing ring is positioned at the joint of the distal end of the thrombus taking support and the guide wire; the second developing ring is positioned at the joint of the proximal end of the thrombus taking support and the distal end of the hypotube.

4. The embolectomy device of claim 1, wherein the embolectomy device comprises a graduated ring; the scale ring is wrapped on the outer sides of the track and the moving block and is located between the handle tail and the adjuster.

5. The embolectomy device of claim 1 wherein the number of tracks is two, and the two tracks are disposed 180 ° opposite each other.

6. The embolectomy device of claim 1, wherein the embolectomy support is a mesh structure.

7. The embolectomy device of claim 6, wherein the embolectomy stent is woven from 48 pieces of nitinol round wire with a wire diameter of 0.04mm, and has a weaving density of 45PPI at the head end and 57PPI at the middle section.

8. The embolectomy device of claim 1, wherein the hypotube is a four-way hypotube formed by laser cutting a tube of high elastic shape memory alloy.

9. The embolectomy device of claim 1 wherein the distal end of the guidewire is sharpened.

10. The embolectomy device of claim 2 wherein the ends of the coil are welded or cemented to the guidewire, and wherein the weld or cement is smooth and burr-free and the maximum outside diameter of the weld or cement does not exceed the outside diameter of the coil.