Thrombectomy device

Abstract

The thrombus extraction device comprises a catheter, a suction assembly, a traction assembly and a plurality of thrombus capturing flexible strips, a plurality of through holes are formed in the far end of the catheter in the circumferential direction of the catheter at intervals, the outer ends of the thrombus capturing flexible strips are located outside the catheter, and the inner ends of the thrombus capturing flexible strips penetrate through the through holes to stretch into the catheter to be connected with the traction assembly in the catheter. The thrombus capturing device has the advantages that the thrombus capturing device is simple in structure, thrombus can be effectively removed, catheter blockage can be remarkably reduced or eliminated, blood vessels cannot be damaged, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of thrombus removal, in particular to a thrombus removal device. Background Art

[0002] Thrombi, also known as blood clots, can attach to blood vessel walls and prevent blood from flowing through healthy blood vessels. Removing thrombi generated within blood vessels and reopening blocked blood vessels is the key to restoring blood vessels blocked by thrombi.

[0003] The existing technology can remove thrombi by using suction catheter devices, stent thrombectomy devices, and suction + stent thrombectomy. The existing suction catheter device uses a negative pressure suction device to allow the thrombus in the blood vessel to enter the catheter from the distal opening of the catheter and finally be extracted. The shortcomings of this method are: when the thrombus is large, the thrombus is easy to block at the distal end of the catheter, and high-viscosity thrombus is also easy to block in the catheter, which increases the risk of thrombectomy surgery and easily causes major medical accidents;

[0004] The existing stent thrombectomy device is connected to the guide wire through the stent, and the stent is brought to the thrombus through the catheter. The stent passes through the thrombus, the stent is released at the thrombus, and the guide wire is pulled back toward the proximal end, so that the thrombus is brought into the catheter by the stent and finally pulled out. The shortcomings of this method are: small thrombi are easy to escape and block the distal blood vessels during the thrombus removal process, and there is also a risk that the stent is exposed in the blood vessel during the thrombus removal, causing endothelial damage, etc. At the same time, when the stent is pulled into the catheter, the clot and the stent may be overall biased, and there is a risk of difficulty in pulling it into the catheter, which increases the operation time and operation risk;

[0005] There is also a method of using suction catheter in conjunction with stent thrombectomy, which can solve some problems with suction thrombectomy alone and stent thrombectomy alone. However, there is still a risk that the clot is too large or the overall direction of the clot and the stent is off, making it difficult to pull the stent into the catheter. Summary of the invention

[0006] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a thrombus removal device which has a simple structure, can effectively remove thrombi, significantly reduce or eliminate catheter obstruction, and does not cause damage to blood vessels.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A thrombus removal device, characterized in that it comprises a catheter, a suction assembly, a traction assembly and a plurality of thrombus capture flexible strips, wherein the distal end of the catheter is provided with a plurality of perforations spaced apart along the circumference of the catheter, the outer end of the thrombus capture flexible strip is located outside the catheter, and the inner end thereof extends through the perforations into the catheter and is connected to the traction assembly in the catheter, the traction assembly pulls the thrombus capture flexible strip to move, and the suction assembly suctions the catheter;

[0009] The suction component can be used to suck the thrombus in the blood vessel and make it enter the catheter. The traction component can pull several thrombus capture flexible strips to move and pull the thrombus into the catheter. The thrombus will not be blocked at the distal end of the catheter, small thrombi will not escape, and will not cause damage to the vascular endothelium. At the same time, it can also solve the problem that the thrombus is too large or the direction of the stent and the thrombus is biased during stent removal, making it difficult to pull the thrombus into the catheter. It has a simple structure, good thrombus removal effect, and reduced surgical risks.

[0010] The traction assembly of the utility model comprises a traction rod, which is a flexible rod. The distal end of the traction rod is connected to the inner end of the thrombus capture flexible strip, and the proximal end extends out of the catheter. The thrombus capture flexible strip is pulled to move by the traction rod.

[0011] The suction assembly of the utility model adopts a piston, and the piston is arranged in the catheter. The size of the piston matches the inner diameter of the catheter. The distal end of the traction rod is connected to the piston, and the inner end of the thrombus capture flexible strip is connected to the piston; the traction rod and the piston cooperate, which can not only pull the thrombus capture flexible strip, but also achieve the effect of thrombus removal. The structure is simple, the cost is low, and the thrombus removal effect is good.

[0012] The inner ends of a plurality of thrombus capturing flexible strips of the utility model are arranged along the outer periphery of the upper surface of the piston, so as to ensure that there is enough space to bring the thrombus into the catheter.

[0013] The piston of the utility model is provided with a guide wire perforation arranged along the axial direction of the piston, so that when removing the thrombus, the guide wire is first used to guide the catheter to the thrombus.

[0014] The traction rod of the utility model is coaxially arranged with the piston, and a guide wire through-hole penetrating the traction rod and the piston is provided at the axis of the traction rod and the piston.

[0015] The distal opening of the catheter of the utility model is arranged as an expandable soft section; when the thrombus is removed, when the thrombus reaches the distal opening of the catheter through suction, if the thrombus is large, the distal end of the catheter can be expanded to ensure that the thrombus can be sucked into the catheter.

[0016] The utility model provides a soft section at the position of the perforation to the distal opening of the catheter.

[0017] The catheter of the utility model is covered with an intermediate catheter, and the distal end of the intermediate catheter is connected to the outer end of the thrombus capture flexible strip; the thrombus capture flexible strip can be pulled toward the proximal end so that the piston can be located at the distal end of the catheter before thrombus removal, and the thrombus capture flexible strip can be kept in a tensioned state to facilitate the capture of thrombi.

[0018] The intermediate catheter of the utility model is covered with an outer sheath tube.

[0019] The beneficial effects of the utility model are as follows: the thrombus in the blood vessel can be sucked out through the suction component to make the thrombus enter the catheter, and the thrombus can be pulled into the catheter by pulling a number of thrombus capture flexible strips through the traction component. The thrombus will not be blocked at the distal end of the catheter, and small thrombi will not escape, nor will they cause damage to the vascular endothelium. At the same time, it can also solve the problem of difficulty in pulling the thrombus into the catheter due to the thrombus being too large or the direction of the stent and the thrombus being offset during stent removal. The utility model has a simple structure, good thrombus removal effect, and reduced surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is the main view of the overall structure of the utility model.

[0022] Figure 3 yes Figure 2 Middle AA section view.

[0023] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0024] Figure 5 This is a schematic diagram of the structure of the soft section of the catheter during thrombectomy.

[0025] Figure numerals: catheter-1, perforation-101, soft section-102, thrombus capture flexible strip-2, piston-301, traction rod-302, guidewire perforation-303. DETAILED DESCRIPTION

[0026] The utility model is described below in conjunction with the accompanying drawings and embodiments.

[0027] As shown in the accompanying drawings, a thrombus removal device comprises a catheter 1, a suction assembly, a traction assembly and a plurality of thrombus capture flexible strips 2. The distal end of the catheter 1 is provided with a plurality of perforations 101 spaced apart along the circumference of the catheter. The outer end of the thrombus capture flexible strip 2 is located outside the catheter, and the inner end thereof passes through the perforations 101 and extends into the catheter 1 to be connected with the traction assembly in the catheter 1. The traction assembly pulls the thrombus capture flexible strip 2 to move, and the suction assembly suctions the catheter 1.

[0028] The suction component can be used to suck the thrombus in the blood vessel so that the thrombus enters the catheter 1. The traction component can pull a number of thrombus capture flexible strips 2 to move and pull the thrombus into the catheter 1. The thrombus will not be blocked at the distal end of the catheter 1, and small thrombi will not escape, nor will they cause damage to the vascular endothelium. At the same time, it can also solve the problem that the thrombus is too large or the direction of the stent and the thrombus is offset during thrombectomy, making it difficult to pull the thrombus into the catheter. The structure is simple, the thrombus removal effect is good, and the surgical risk is reduced.

[0029] The traction assembly includes a traction rod 302 , which is a flexible rod. The distal end of the traction rod 302 is connected to the inner end of the thrombus capture flexible strip 2 , and the proximal end extends out of the catheter 1 . The thrombus capture flexible strip 2 is pulled to move by the traction rod 302 .

[0030] The suction assembly adopts a piston 301, and the piston 301 is arranged in the catheter 1. The size of the piston 301 matches the inner diameter of the catheter 1. The piston 301 slides along the inner wall of the catheter 1. The distal end of the traction rod 302 is connected to the lower surface of the piston 301, and the inner end of the thrombus capture flexible strip 2 is connected to the upper surface of the piston 301; the traction rod 302 cooperates with the piston 301, which can not only pull the thrombus capture flexible strip 2, but also achieve the effect of thrombus removal by suction, with a simple structure, low cost and good thrombus removal effect.

[0031] The inner ends of a plurality of thrombus capturing flexible strips 2 are arranged along the outer periphery of the upper surface of the piston 301 to ensure that there is enough space to bring the thrombus into the catheter.

[0032] In this embodiment, at least one thrombus capturing flexible strip 2 can be inserted into each through-hole 101 on the catheter 1, and the number can be selected according to specific usage requirements.

[0033] The piston 301 is provided with a guide wire hole 303 that penetrates the piston 301 axially, so that the guide wire can be used to guide the catheter 1 to the thrombus when removing the thrombus.

[0034] The traction rod 302 is coaxially arranged with the piston 301 , and a guide wire through hole 303 penetrating the traction rod 302 and the piston 301 is opened at the axis of the traction rod 302 and the piston 301 .

[0035] The distal opening of the catheter 1 is provided with an expandable soft section 102 so that when removing the thrombus, when the thrombus reaches the distal opening of the catheter through suction, if the thrombus is large, the distal end of the catheter can be expanded to ensure that the thrombus can be sucked into the catheter.

[0036] The position from the perforation 101 to the distal opening of the catheter is configured as a soft section 102 .

[0037] The catheter 1 is covered with an intermediate catheter, and the distal end of the intermediate catheter is connected to the outer end of the thrombus capture flexible strip 2; the thrombus capture flexible strip 2 can be pulled proximally so that the piston 301 can be located at the distal end of the catheter 1 before thrombus removal, and the thrombus capture flexible strip 2 can be kept in a tensioned state to facilitate the capture of thrombi.

[0038] In this embodiment, the thrombus capturing flexible strip 2 can be made of thin wires or thin tubes.

[0039] The intermediate catheter is covered with an outer sheath tube.

[0040] During thrombectomy:

[0041] 1. Puncture the femoral artery, use the guide wire to guide the outer sheath into the blood vessel to the proximal position of the thrombus, and then withdraw the guide wire;

[0042] 2. The catheter 1 and the intermediate catheter are inserted into the outer sheath, and the catheter 1, the intermediate catheter and the traction rod 302 etc. are moved in the outer sheath to reach the proximal end of the thrombus;

[0043] 3. Pull the intermediate catheter outward at the femoral artery. At this time, the intermediate catheter drives the thrombus capture flexible strip 2 to move proximally, drives the piston 301 and the traction rod 302 to move distally, and the piston 301 reaches the opening position of the catheter 1;

[0044] 4. The outer sheath is withdrawn outward for a distance, and the traction rod 302 is pulled toward the proximal end. The traction rod 302 drives the piston 301 and the inner end of the thrombus capture flexible strip 2 to move toward the proximal end. Under the suction action of the piston 301, the thrombus is sucked into the distal opening of the catheter. When the thrombus is large, the soft section 102 of the catheter expands into a trumpet shape. After the thrombus reaches the distal opening of the catheter, the thrombus can be completely entered into the catheter 1 under the action of the inward pulling of the thrombus capture flexible strip 2 and the suction action of the movement of the piston 301, and small thrombi will not escape to the distal end.

[0045] 5. Withdraw catheter 1, the intermediate catheter, and the outer sheath.

Claims

1. A thrombus removal device, characterized in that: It includes a catheter, a suction component, a traction component and a plurality of thrombus capture flexible strips. The distal end of the catheter is provided with a plurality of perforations spaced apart along the circumference of the catheter. The outer end of the thrombus capture flexible strip is located outside the catheter, and the inner end passes through the perforations and extends into the catheter to be connected with the traction component in the catheter. The traction component pulls the thrombus capture flexible strip to move, and the suction component suctions the catheter.

2. The thrombus removal device according to claim 1, characterized in that: The traction assembly comprises a traction rod, which is a flexible rod. The distal end of the traction rod is connected to the inner end of the thrombus capturing flexible strip, and the proximal end extends out of the catheter.

3. The thrombus removal device according to claim 2, characterized in that: The suction assembly adopts a piston, which is arranged in the catheter. The size of the piston matches the inner diameter of the catheter. The distal end of the traction rod is connected to the piston, and the inner end of the thrombus capture flexible strip is connected to the piston.

4. The thrombus removal device according to claim 3, characterized in that: The inner ends of a plurality of thrombus capturing flexible strips are arranged along the outer circumference of the upper surface of the piston.

5. The thrombus removal device according to claim 3 or 4, characterized in that: The piston is provided with a guide wire through hole which penetrates the piston axially.

6. The thrombus removal device according to claim 5, characterized in that: The traction rod is coaxially arranged with the piston, and a guide wire through-hole penetrating the traction rod and the piston is provided at the axis of the traction rod and the piston.

7. The thrombus removal device according to claim 1, 2, 3, 4 or 6, characterized in that: The distal opening of the catheter is arranged as an expandable soft section.

8. The thrombus removal device according to claim 7, characterized in that: The perforation to the distal opening of the catheter is configured as a soft section.

9. The thrombus removal device according to claim 1 or 2 or 3 or 4 or 6 or 8, characterized in that: The catheter is covered with an intermediate catheter, and the distal end of the intermediate catheter is connected to the outer end of the thrombus capturing flexible strip.

10. The thrombus removal device according to claim 9, characterized in that: The intermediate catheter is covered with an outer sheath tube.

Images