High-stability hemodialysis internal fistula thrombus taking-out device

Abstract

The utility model provides a high-stability hemodialysis internal fistula thrombus taking-out device which comprises a catheter used for moving to the near end of a thrombus along a corresponding blood vessel; the thrombus taking piece is movably arranged on the inner side of the catheter in a penetrating mode, two groove clamping pieces with opposite groove openings are rotationally arranged at the far end of the thrombus taking piece, and the two groove clamping pieces are driven by a driving device to be oppositely clamped or oppositely opened; the two negative pressure pieces respectively comprise air bags arranged on the outer walls of the two groove clamping pieces, negative pressure holes communicated with the corresponding air bags are respectively formed in the groove bottoms of the inner grooves of the two groove clamping pieces in a penetrating mode, the two groove clamping pieces are oppositely clamped, and the two inner grooves and the air bags are arranged in a negative pressure mode; through cooperation of the negative pressure piece and the groove clamping piece, the thrombus removing mode that thrombus is adsorbed into the groove clamping piece through negative pressure and clamped and completely taken out is achieved, it is avoided that the thrombus is cut and broken in the thrombus taking process, and the stability and safety of hemodialysis internal fistula thrombus removing are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hemodialysis internal fistula thrombus removal device field, specifically point to a kind of high-stability hemodialysis internal fistula thrombus removal device. BACKGROUND

[0002] Arteriovenous fistula is the "lifeline" of hemodialysis patients, including autologous arteriovenous fistula (AVF) and artificial vascular arteriovenous fistula (AVG). Thrombosis leading to internal fistula vascular occlusion is the main reason for arteriovenous fistula failure, and is one of the common complications, so as to ensure the dialysis adequacy of patients, percutaneous transluminal angioplasty (PTA) combined with thrombectomy is usually used to achieve internal fistula recanalization, and thrombectomy can be divided into incision thrombectomy and thrombectomy catheter thrombectomy.

[0003] The existing thrombectomy catheter thrombectomy is completed by cooperating the catheter and the guide wire with the thrombectomy stent in the catheter, specifically, the catheter is inserted into the blood vessel to cross the thrombus to the distal end of the thrombus, the thrombectomy stent made of memory material is released by retracting the catheter, the thrombectomy stent is expanded, and the thrombectomy stent is dragged to separate the thrombus from the blood vessel to complete the thrombectomy. However, since the thrombus is a fragile tissue formed by blood stasis, it is easy to be cut and broken during the dragging process of the thrombectomy stent, resulting in incomplete thrombectomy, and the large pieces of thrombus tissue will move to the heart, brain, lung and other blood vessels with blood flow, which will have very serious consequences.

[0004] Aiming at the problems existing in the prior art, the utility model provides a high-stability hemodialysis internal fistula thrombus removal device, which can effectively solve the problems existing in the prior art. UTILITY MODEL CONTENTS

[0005] Aiming at the problems existing in the prior art, the utility model provides a high-stability hemodialysis internal fistula thrombus removal device, which can effectively solve the problems existing in the prior art.

[0006] The technical scheme of the utility model is:

[0007] A high-stability hemodialysis internal fistula thrombus removal device, comprising:

[0008] A catheter is used to move along the corresponding blood vessel to the proximal end of the thrombus;

[0009] A thrombectomy member is movably arranged in the catheter, and the distal end of the thrombectomy member is rotatably provided with two slot clamping members with opposite slots;

[0010] Two negative pressure pieces respectively include air bags arranged on the outer walls of the two groove clamping pieces, the inner groove bottoms of the two groove clamping pieces are respectively provided with negative pressure holes communicating with the corresponding air bags, the two groove clamping pieces are clamped towards each other, and the two inner grooves and the air bags are provided with negative pressure; after the thrombus extraction piece moves to the positions corresponding to the proximal ends of the thrombus, the two groove clamping pieces are opened away from each other, the air bags are inflated, and the thrombus is attracted to the space between the two inner grooves under the negative pressure and then the two groove clamping pieces are clamped towards each other.

[0011] Further, the negative pressure piece further comprises a fixing ring and a groove body part connected in sequence, the air bags of the two negative pressure pieces are respectively fixed on the outer walls of the two groove clamping pieces, the fixing ring is respectively fixed and penetrates into the corresponding negative pressure hole, and the groove body part is respectively adapted and fixed on the inner walls of the two inner grooves, the groove bottoms of the groove body parts and the inner sides of the fixing ring are provided with through communication between the inner grooves and the air bags, the groove openings of the two groove body parts are outwardly folded and extended to form sealing parts fixedly fitted on the groove opening end parts of the corresponding inner grooves, and the two groove clamping pieces are clamped and sealed towards each other through the two sealing parts.

[0012] Further, the sealing parts are made of elastic material, the distal end opposite sides of the two sealing parts are respectively provided with a plurality of shallow grooves and a plurality of convex columns, when the two groove clamping pieces are clamped towards each other and not clamped, the shallow grooves and the convex columns form a pressure gap communicating between the outside and the inner sides of the groove body parts, when the two groove clamping pieces are clamped and sealed towards each other, the shallow grooves and the convex columns are deformed and sealed under pressure, and when the two groove clamping pieces are opened away from each other, the two sealing parts are pulled away from each other, and the shallow grooves and the convex columns return to form the pressure gap.

[0013] Further, the inner wall of the air bag is embedded with an expansion frame made of shape memory material (not shown in the figure), when the air bag is provided with negative pressure, the expansion frame is contracted, and when the two groove clamping pieces are opened, the expansion frame is restored to expand and drive the air bag to inflate.

[0014] Further, the thrombus extraction piece is provided in a tubular structure adapted to be arranged in the catheter, the distal end part of the thrombus extraction piece is recessed to form a sliding groove with a groove bottom communicating with the inside, the proximal end parts of the two groove clamping pieces are fixedly provided with linkage rods extended and rotationally connected in the sliding groove, the driving device comprises an operation handle, a guide wire arranged in the thrombus extraction piece and driven by the operation handle to stretch and retract along the inner side of the thrombus extraction piece, and two driving rods arranged in the sliding groove and rotationally connected at one end to the distal end part of the guide wire, the other ends of the two driving rods are respectively rotationally connected to the proximal end parts of the two linkage rods.

[0015] Further, the two linkage rods are cross-lapped and coaxially connected to the chute slot in the middle, and the front side and the rear side of the distal end of the two linkage rods are respectively provided with a limiting part corresponding to the other linkage rod; when the two slot clamping pieces are oppositely opened to abut against the limiting parts of the corresponding linkage rods, the two slot clamping pieces are limited, and the distal end of the two slot clamping pieces is used to open the blood vessel to separate the thrombus proximal end from the blood vessel.

[0016] Further, the outer wall of the slot clamping piece is provided in an arc-shaped chamfer, and the two slot clamping pieces are provided in an elongated extension away from the thrombus taking piece, and the negative pressure hole is provided in a long hole shape extending along the length direction of the slot clamping piece.

[0017] Therefore, the utility model provides the following effects and / or advantages:

[0018] 1. First, the two slot clamping pieces are oppositely clamped, and the two inner grooves and the air bag negative pressure are set, at this time, the air bag is deflated and tightly attached to the outer wall of the slot clamping piece, so that the thrombus taking piece can be smoothly moved to the distal end of the two slot clamping pieces corresponding to the thrombus proximal end, then the two slot clamping pieces are oppositely opened, the air bag is inflated, at this time, the two inner grooves maintain a negative pressure state, the thrombus is attracted to the two inner grooves by negative pressure, then the two slot clamping pieces are oppositely clamped, finally the thrombus taking piece is withdrawn along the catheter, and then the catheter is withdrawn along the blood vessel, thereby completing the thrombus removal operation. Thus, through the cooperation between the negative pressure piece and the slot clamping piece, the thrombus is adsorbed to the slot clamping piece by negative pressure, and the complete thrombus removal mode is achieved, which avoids cutting and crushing the thrombus during thrombus taking, thereby avoiding the serious consequences caused by the scattered thrombus tissue moving to the heart, brain, lung and other blood vessels with blood flow, and improving the stability and safety of the hemodialysis internal fistula thrombus removal.

[0019] 2. Through the setting of the slot body part and the fixing ring, the connection strength between the air bag and the slot clamping piece is improved, and through the setting of the slot body part and the sealing part, the sealing property of the two slot clamping pieces after being oppositely clamped is improved, the negative pressure stability between the two slot clamping pieces when being moved to the thrombus proximal end is improved, and then it is ensured that the two slot clamping pieces can have sufficient negative pressure strength to attract the thrombus to move between the two inner grooves when being oppositely opened, thereby ensuring the thrombus taking stability.

[0020] 3. Through the setting of the plurality of shallow grooves and the plurality of convex columns, under the premise of ensuring the sealing property of the two slot clamping pieces when being oppositely clamped, when the two slot clamping pieces are oppositely opened, the distal end of the two sealing parts can be subjected to a certain negative pressure damage through the pressure damage gap formed between the shallow grooves and the convex columns, so as to ensure that the two slot clamping pieces can be stably opened without excessive damage to the negative pressure attraction strength. When the two slot clamping pieces are opened, the thrombus can still be subjected to negative pressure attraction through the negative pressure effect of the air bag inflation. Therefore, through the setting of the pressure damage gap, the defect that the two slot clamping pieces are difficult to open due to the addition of the sealing part is solved, and the stability and practicability of the slot clamping piece are further improved.

[0021] 4、Through the setting of the expansion frame, the inflation degree and speed of the air bag when the two-groove clamping pieces are opened are improved, and then the negative pressure suction strength between the two-groove clamping pieces is improved, so that the thrombus can be smoothly sucked and clamped between the two-groove clamping pieces, and the thrombus taking effect and stability are improved.

[0022] It should be understood that the above summary and the following detailed description of the present application are exemplary and explanatory, and are intended to provide further explanation of the present application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structure schematic view of a high-stability hemodialysis internal fistula thrombus taking-out device provided by the present application.

[0024] Figure 2 A sectional structure schematic view of a high-stability hemodialysis internal fistula thrombus taking-out device provided by the present application.

[0025] Figure 3 A sectional structure schematic view of a groove clamping piece.

[0026] Figure 4 A structure schematic view of the groove clamping piece and the driving rod when the groove clamping piece is clamped towards the driving rod.

[0027] Figure 5 A structure schematic view of the groove clamping piece and the driving rod when the groove clamping piece is opened away from the driving rod.

[0028] Figure 6 A structure schematic view of a unilateral groove clamping piece and a negative pressure piece.

[0029] Figure 7 A structure schematic view of a groove clamping piece of the second embodiment.

[0030] Figure 8 A sectional structure schematic view of a groove clamping piece of the second embodiment. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of those skilled in the art, the structure of the present application will be further described in detail in combination with the drawings:

[0032] Embodiment I

[0033] Reference Figures 1-6 A high-stability hemodialysis internal fistula thrombus taking-out device, comprising:

[0034] A catheter (not shown in the figure) is used to move along the corresponding blood vessels to the proximal end of the thrombus;

[0035] The bolt taking member 1 moves the two slot clamping members 2 provided with notches on the distal end and the driving device (not shown in the figure) drives the two slot clamping members 2 to be clamped or opened, specifically, the driving device can be a micro motor, in order to save costs, it can also be a common device in the field of bolt taking surgery including operating handle and other structures;

[0036] The two negative pressure members 3 respectively include air bags 31 provided on the outer wall of the two slot clamping members 2, the inner slots 21 of the two slot clamping members 2 are respectively provided with negative pressure holes 211 communicating with the corresponding air bags 31, and the two slot clamping members 2 are clamped and the two inner slots 21 and air bags 31 are provided with negative pressure, at this time the air bag 31 is deflated and tightly attached to the outer wall of the slot clamping member 2; after the bolt taking member 1 moves to the distal end of the two slot clamping members 2 corresponding to the proximal end of the thrombus, the two slot clamping members 2 are opened, the air bag 31 is inflated, at this time the two inner slots 21 maintain a negative pressure state, the thrombus is attracted to the two inner slots 21 by negative pressure, and then the two slot clamping members 2 are clamped, finally the bolt taking member 1 is withdrawn along the catheter, and then the catheter is withdrawn along the blood vessel, that is, the thrombus removal surgery is completed, specifically, during the withdrawal of the catheter along the blood vessel, the air bag 31 is no longer under negative pressure, and the air bag 31 will deform with the change of the inner diameter of the blood vessel.

[0037] The above structure is provided by the cooperation between the negative pressure member 3 and the slot clamping member 2, which realizes the thrombus removal method of negative pressure adsorption of thrombus to the slot clamping member 2 and clamping complete removal, avoids cutting and crushing the thrombus during the thrombus removal process, and further avoids the scattered thrombus tissue moving to the heart, brain, lung and other blood vessels with blood flow, causing serious consequences, and improves the stability and safety of the hemodialysis internal fistula thrombus removal.

[0038] In order to improve the sealing performance of the two groove clamps 2 after clamping, and ensure that they move stably to the proximal end of the thrombus in a negative pressure state, the negative pressure device 3 further comprises a fixed ring 32 and a groove body 33 connected in sequence to the air bag 31. The air bags 31 of the two negative pressure devices 3 are respectively fixed to the distal outer walls of the two groove clamps 2, the fixed rings 32 are respectively fixed and penetrated into the corresponding negative pressure holes 211, and the groove bodies 33 are respectively adapted and fixed to the inner walls of the two inner grooves 21. The groove bottoms of the groove bodies 33 and the inner sides of the fixed rings 32 are penetrated and communicated with the inner grooves 21 and the air bags 31. The groove openings of the two groove bodies 33 are outwardly folded and extended to form sealing parts 34 fixedly attached to the groove opening end portions of the corresponding inner grooves 21. The two groove clamps 2 are clamped and sealed by the two sealing parts 34. Specifically, the two groove clamps 2 and the negative pressure device 3 are the same in structure and symmetrically arranged. The negative pressure device 3 is made of a material such as silicone, which is elastic, sealing, harmless, and the like. The groove body 33 and the fixed ring 32 are shaped by high temperature, high pressure, and the like, so as to retain elasticity and sealing performance while being adapted and fixedly attached to the corresponding inner grooves 21 and negative pressure holes 211. Thus, by arranging the groove body 33 and the fixed ring 32, the connection strength between the air bag 31 and the groove clamp 2 is improved. By arranging the groove body 33 and the sealing part 34, the sealing performance of the two groove clamps 2 after clamping is improved, the negative pressure stability between the two groove clamps 2 when moving to the proximal end of the thrombus is improved, and thus the two groove clamps 2 can have sufficient negative pressure strength to attract the thrombus to move between the two inner grooves 21 when opened in opposite directions, thereby ensuring the stability of thrombectomy.

[0039] In order to improve the negative pressure attraction strength of the two groove clamps 2, the inner wall of the air bag 31 is embedded with an expansion frame (not shown in the figure) made of a shape memory material. When the air bag 31 is in a negative pressure state, the expansion frame is contracted. When the two groove clamps 2 are opened, the expansion frame restores and expands to drive the air bag 31 to bulge. Specifically, the expansion frame can be woven into a mesh structure by a wire-shaped shape memory alloy and embedded into the air bag 31. Its specific shape can be adaptively adjusted, and the whole shape is adapted to the shape of the air bag 31 after bulging. Here, no specific limitation is made. Thus, by arranging the expansion frame, the bulging degree and speed of the air bag 31 when the two groove clamps 2 are opened are improved, thereby improving the negative pressure attraction strength between the two groove clamps 2, ensuring that the thrombus can be smoothly attracted to the two groove clamps 2 after clamping and captured, and improving the thrombectomy effect and stability.

[0040] Specifically, the plug member 1 is provided as a tubular structure adapted to be arranged in the catheter, the distal end of the plug member 1 is recessed with a groove bottom communicating with the inside of the slide groove 11, the proximal end of the two groove clamping members 2 is fixedly provided with a linkage rod 22 extending and rotatably connected in the slide groove 11, the driving device includes an operating handle, a guide wire 4 arranged in the plug member 1 and driven by the operating handle to extend and retract along the inside of the plug member 1, two driving rods 5 arranged in the slide groove 11 and rotatably connected at one end to the distal end of the guide wire 4, the other end of the two driving rods 5 is rotatably connected to the proximal end of the two linkage rods 22 respectively, when the guide wire 4 is retracted towards the proximal end, the two driving rods 5 and the two linkage rods 22 are pulled in turn to swing towards each other to drive the two groove clamping members 2 to clamp towards each other, when the guide wire 4 is extended towards the distal end, the two driving rods 5 and the two linkage rods 22 are pushed in turn to swing away from each other to drive the two groove clamping members 2 to open away from each other, the operating handle can control the extension and retraction of the guide wire 4 and the catheter by screw connection or other means, the catheter can also be driven by the operating handle to extend and retract along the blood vessel, the specific structure of the operating handle is prior art and not the point of the present application, which will not be described here.

[0041] In order to avoid the two groove clamping members 2 from being excessively opened to damage the side wall of the blood vessel, the two linkage rods 22 are crossed and superimposed at the front and rear and coaxially rotatably connected to the slot of the slide groove 11, the front side and the rear side of the distal end of the two linkage rods 22 are respectively provided with a limiting portion 221 corresponding to the other linkage rod 22; when the two groove clamping members 2 are opened away from each other to the limiting portion 221 respectively abuts against the corresponding linkage rod 22, the two groove clamping members 2 are limited, the distal end of the two groove clamping members 2 is opened to separate the thrombus proximal end from the blood vessel, specifically, the opening angle of the two groove clamping members 2 is set to slightly open the distal end of the blood vessel, and the specific angle can be adjusted adaptively. Therefore, by limiting the limiting portion 221, the two groove clamping members 2 can be prevented from being excessively opened to damage the side wall of the blood vessel, and the safety of the thrombus removal device is improved.

[0042] In order to improve the accommodation space of the two groove clamping members 2, the outer wall of the groove clamping member 2 is provided as an arc-shaped chamfer, the two groove clamping members 2 are provided as long and elongated in the direction away from the plug member 1, thereby expanding and lengthening the groove depth and groove length of the inner groove 21 of the two groove clamping members 2, improving the accommodation space between the two groove clamping members 2, to ensure that the thrombus can be completely removed as a whole, the negative pressure hole 211 is provided as a long hole extending along the length direction of the groove clamping member 2, thereby improving the uniformity of the negative pressure between the two groove clamping members 2, and improving the negative pressure effect of the air bag 31 on the inner groove 21 of the two groove clamping members 2.

[0043] Embodiment two

[0044] Reference Figures 7-8, in order to avoid the risk of the two slot clamps 2 being difficult to open and thus unable to remove the thrombus when the two slot clamps 2 need to be opened, after the two slot clamps 2 are clamped and sealed by the two sealing parts 34 and the inner slot 21 and the air bag 31 are provided with negative pressure, the embodiment differs from the first embodiment in that:

[0045] The sealing part 34 is made of an elastic material, and the distal ends of the two sealing parts 34 are respectively recessed and protruded with a plurality of corresponding shallow grooves 341 and a plurality of protruding columns 342. When the two slot clamps 2 are clamped together and not clamped, the shallow grooves 341 and the protruding columns 342 form a pressure breaking gap 35 that connects the outside and the inside of the slot body part 33. When the two slot clamps 2 are clamped together and sealed, the shallow grooves 341 and the protruding columns 342 are deformed and sealed under pressure. When the two slot clamps 2 are opened in opposite directions, the two sealing parts 34 are pulled in opposite directions, and the shallow grooves 341 and the protruding columns 342 return to form the pressure breaking gap 35 between them. Thus, by providing the shallow grooves 341 and the protruding columns 342, the distal ends of the two sealing parts 34 can be broken by the pressure breaking gap 35 formed between the shallow grooves 341 and the protruding columns 342 when the two slot clamps 2 are opened in opposite directions, to ensure that the two slot clamps 2 can be stably opened without excessive damage to the negative pressure suction strength. When the two slot clamps 2 are opened, the negative pressure effect of the air bag 31 can still attract the thrombus, so that the pressure breaking gap 35 solves the problem of the two slot clamps 2 being difficult to open due to the addition of the sealing part 34, and further improves the stability and practicality of the slot clamps 2.

[0046] It should be noted that the implementation principle and technical effects of the present embodiment are the same as those of the first embodiment. For brevity, the present embodiment is not mentioned in the first embodiment.

[0047] The above only describes preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly stable hemodialysis internal fistula thrombus extraction device, characterized by, The utility model provides a kind of thrombus removal device, including: Catheter, for moving to thrombus proximal along corresponding blood vessel; Thrombus removal device (1), moving and being provided with two slot clamps (2) of notch facing each other in distal end portion inside the catheter, two slot clamps (2) are driven by driving device and are closed or are opened in opposite direction; Two negative pressure devices (3), respectively including air bag (31) being provided on the outer wall of two slot clamps (2), the inner slot (21) of two slot clamps (2) is respectively provided with negative pressure hole (211) being communicated with corresponding air bag (31), two slot clamps (2) are closed and the negative pressure of two inner slots (21) and air bag (31) is arranged;After the thrombus removal device (1) moves to the distal end portion of two slot clamps (2) corresponding to the thrombus proximal, two slot clamps (2) are opened in opposite direction, air bag (31) is inflated, and the thrombus is attracted to the inner slot (21) between two slot clamps (2) by negative pressure and then two slot clamps (2) are closed; The inner wall of the air bag (31) is embedded with an expansion frame made of shape memory material. When the air bag (31) is under negative pressure, the expansion frame is contracted, and when the two slot clamps (2) are opened, the expansion frame expands to inflate the air bag (31).

2. A highly stable thrombus removal device for internal fistula for hemodialysis as claimed in claim 1, wherein, The negative pressure device (3) further includes a fixing ring (32) and a groove body (33) connected in sequence, the air bag (31) of the two negative pressure devices (3) is respectively fixed on the outer wall of the two slot clamps (2), the fixing ring (32) is respectively fixed and penetrates into the corresponding negative pressure hole (211), and the groove body (33) is respectively adapted and fixed on the inner wall of the two inner slots (21), the groove bottom of the groove body (33) and the inner side of the fixing ring (32) penetrate and communicate the inner slot (21) and the air bag (31), and the groove opening of the two groove bodies (33) is outwardly folded and extended to form a sealing part (34) fixedly attached to the groove opening end of the corresponding inner slot (21), and the two slot clamps (2) are tightly sealed by the two sealing parts (34) facing each other.

3. A highly stable thrombus removal device for internal fistula for hemodialysis as claimed in claim 2, wherein, The sealing part (34) is made of elastic material, and the distal end opposite sides of the two sealing parts (34) are respectively recessed and protruded with a plurality of corresponding shallow grooves (341) and a plurality of protruding columns (342), when the two slot clamps (2) are closed and not tightly clamped, the shallow grooves (341) and the protruding columns (342) form a pressure gap (35) communicating the outside and the inner side of the groove body (33), when the two slot clamps (2) are tightly sealed, the shallow grooves (341) and the protruding columns (342) are deformed and sealed by pressure, and when the two slot clamps (2) are opened in opposite direction, the two sealing parts (34) are pulled in opposite direction, and the shallow grooves (341) and the protruding columns (342) are restored to form the pressure gap (35) between them.

4. A highly stable hemodialysis internal fistula thrombus extraction device as claimed in claim 1, characterized in that, The thrombus removing member (1) is provided as a tubular structure adapted to be arranged in the catheter, and a chute (11) is arranged in the distal end of the thrombus removing member (1) and communicates with the interior of the chute (11). The proximal end of the two groove clamping members (2) is fixedly provided with a linkage rod (22) extending and rotatably connected in the chute (11). The driving device comprises an operating handle, a guide wire (4) arranged in the thrombus removing member (1) and driven by the operating handle to extend and retract along the inner side of the thrombus removing member (1), and two driving rods (5) arranged in the chute (11) and rotatably connected at one end to the distal end of the guide wire (4). The other end of the two driving rods (5) is rotatably connected to the proximal end of the two linkage rods (22), respectively.

5. A highly stable thrombus removal device for internal fistula for hemodialysis as claimed in claim 4, wherein, The two linkage rods (22) are arranged in front of and behind each other, and the middle part is coaxially rotatably connected to the slot of the chute (11). The front side and the rear side of the distal end of the two linkage rods (22) are respectively provided with a limiting portion (221) corresponding to the other linkage rod (22). When the two groove clamping members (2) are oppositely opened to abut against the limiting portions (221) of the corresponding linkage rods (22), the two groove clamping members (2) are limited. The distal end of the two groove clamping members (2) is used to open the blood vessel to separate the proximal end of the thrombus from the blood vessel.

6. A highly stable hemodialysis internal fistula thrombus extraction device as claimed in claim 1, characterized in that, The outer wall of the groove clamping member (2) is provided as an arc-shaped chamfer. The two groove clamping members (2) are provided as long and elongated in the direction away from the thrombus removing member (1). The negative pressure hole (211) is provided as a long hole extending along the length direction of the groove clamping member (2).

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