Bending-adjustable intravascular tissue grasping forceps

Abstract

The utility model discloses a pair of bending-adjustable intravascular tissue grasping forceps, which relates to the technical field of medical apparatuses and instruments and particularly comprises an elastic tube; the clamping end is arranged at the front end of the elastic tube and comprises a clamping jaw; the operating end is arranged at the tail end of the elastic tube and comprises an actuating handle for driving the clamping end to act and a plurality of groups of control handles for controlling the direction adjustment of the front end of the elastic tube; the control handle comprises a second base body, a sliding block moving in the center line direction of the second base body and a traction line penetrating through the elastic pipe. According to the bending-adjustable intravascular tissue grasping forceps, the elastic tube is arranged, the traction line is connected to the front end of the inner wall of the elastic tube, and by means of the self-aligning effect of the elastic tube and the traction effect of the rear end of the traction line, the function that the direction of the clamping jaw at the front end can be adjusted in a tube cavity is achieved; therefore, the problem that long-distance operation point tissue is not easy to grab is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and more particularly to an adjustable curved intravascular tissue grasping forceps. Background Art

[0002] Biopsy forceps are commonly used to obtain tissue samples from the body. Specifically, they are used to obtain tissue samples from the walls or sides of biological lumens (such as the trachea, esophagus, and blood vessels). When taking a sample, the biopsy forceps must be aligned with the tissue to be sampled.

[0003] Intimal tissue hyperplasia is the main cause of arteriovenous fistula stenosis in hemodialysis patients. During intraluminal treatment such as balloon dilatation, intimal tissue floating in the lumen, intimal disorder, and unsatisfactory lumen acquisition often occur, affecting the actual lumen acquisition effect of balloon dilatation. In addition, if subsequent operations with devices such as drug-coated balloons are performed on this basis, the effect will be affected to a certain extent. For intraluminal treatment of arteriovenous fistula thrombosis, residual mural thrombus may still exist after balloon dilatation. Therefore, based on the concept of "lumen treatment", when clinicians perform intraluminal treatment of stenosis or thrombosis related to arteriovenous fistula in hemodialysis patients, in addition to balloon dilatation, they also use existing biopsy forceps and other tools to grab and remove these intimal hyperplasia tissues or residual mural thrombus to obtain a larger vascular lumen.

[0004] like Figure 1 As shown, the closer to the access point to blood vessel 1 and the straighter the blood vessel, that is, the closer the operation is to the operation point 101, the easier it is to use the biopsy forceps to remove the tissue in the blood vessel; on the contrary, at the distant operation point 102, the operation is more difficult; especially in the case of venous intimal hyperplasia near the anastomosis, which is more common in autologous arteriovenous fistulas, the bending angle here is large, and it is more difficult to use the biopsy forceps to remove the intimal.

[0005] If the tip of the biopsy forceps can be bent, it will be easier to grasp the tissue inside the blood vessel. Currently, the tip of the biopsy forceps is usually pre-bent manually, but the bending angle is completely dependent on experience. The bending angle of the biopsy forceps does not match the bending angle of the blood vessel. Sometimes the biopsy forceps needs to be pulled out and bent multiple times, which is time-consuming and labor-intensive and can easily damage the biopsy forceps structure.

[0006] At present, there are no dedicated intravascular tissue grasping forceps in China. In summary, how to provide an adjustable curved intravascular tissue grasping forceps that can solve problems such as long internal distance of the lumen, large curvature, and inconvenient operation is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0007] In view of this, the purpose of the present invention is to provide an adjustable curved intravascular tissue grasping forceps. By setting an elastic tube and connecting a traction line at the front end of the inner wall of the elastic tube, the self-righting effect of the elastic tube and the traction effect of the rear end of the traction line are used to achieve the function of adjusting the direction of the front end clamp in the lumen, thereby solving the problem that tissue is difficult to grasp at a remote operation point.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] An adjustable curved intravascular tissue grasping forceps, comprising:

[0010] elastic tube;

[0011] A clamping end, provided at the front end of the elastic tube, comprising a clamping claw;

[0012] The operating end is arranged at the tail end of the elastic tube, and includes an actuating handle for driving the clamping end to move, and several groups of control handles for controlling the direction adjustment of the front end of the elastic tube; the control handle includes a second base, a slider moving along the center line direction of the second base, and a traction line passing through the elastic tube; the front end of the traction line is fixedly connected to the front end of the inner wall of the elastic tube, and the rear end is fixedly connected to the slider; and the connection points of several groups of the traction lines and the elastic tube are arranged in a circular array about the center line of the elastic tube.

[0013] Preferably, a rotating ring is coaxially rotated outside the second base, and the inner wall of the rotating ring is connected to the outer peripheral wall of the slider through a thread. When the rotating ring rotates, the slider can be driven to move along the center line direction of the second base through the thread.

[0014] Preferably, two groups of pulling lines are connected inside the slider, one group of pulling lines is directly connected to the slider, and the other group of pulling lines bypasses the second rotating shaft at the tail end of the second base, turns back and is connected to the slider; the connection points of the two groups of pulling lines and the elastic tube are coplanar with the center line of the elastic tube.

[0015] Preferably, the second base bodies in the plurality of groups of the control handles are coaxially fixedly connected, and the traction line passes through the second base bodies.

[0016] Preferably, a channel tube is provided outside the pulling line, and the channel tube is arranged to fit the inner wall of the elastic tube, or the channel tube is arranged inside the tube wall of the elastic tube.

[0017] Preferably, the actuating handle includes a first base, a movable handle that moves axially along the first base, and two actuating wires that pass through the elastic tube; the front end of the actuating wire is connected to the extension arm of the clamping jaw, and the tail end is connected to the movable handle; pulling the actuating wire can drive the clamping jaw to close, and releasing the actuating wire can cause the clamping jaw to open.

[0018] Preferably, the rear ends of the two actuating wires are connected and pass around the first rotating shaft inside the movable handle.

[0019] Preferably, the first base is a hollow tube and is provided with a long groove in the radial direction. The length direction of the long groove is consistent with the center line direction of the first base, and the first rotating shaft passes through the long groove.

[0020] Preferably, a thumb ring is fixedly provided at the tail end of the first base, and an annular groove is provided on the outer periphery of the movable handle.

[0021] Preferably, the first base and the second base are relatively fixedly arranged, and the actuating wire passes through the hollow cavity of the second base; or the first base and the second base are relatively independently arranged, and the first base and the second base are respectively relatively fixedly connected to the tail end of the elastic tube.

[0022] Preferably, the clamping end further comprises a U-shaped clip, the intersection of the clamping jaws is connected to the open end of the U-shaped clip via a rotating shaft, and the other end of the U-shaped clip is fixedly mounted to the front end of the elastic tube.

[0023] Compared with the prior art, the adjustable curved intravascular tissue grasping forceps provided by the present invention has at least the following beneficial effects:

[0024] 1. A traction wire is added to the elastic tube, and a control handle is added to the operating end. The control handle pulls the traction wire to move the front end of the elastic tube to adjust the direction, so that the front end of the elastic tube drives the clamping end to pass through the lumen smoothly and align the clamping end with the internal tissue to be clamped, with flexible adjustment methods.

[0025] 2. Use elastic tubes instead of traditional hoses. The elastic tubes have the ability to automatically straighten, that is, when the force of the traction wire is eliminated, they can automatically restore to a straight line, making it easier to adjust the direction of the front end of the elastic tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the clamping method of internal tissue in the prior art;

[0028] Figure 2 This is a schematic structural diagram of the specific adjustable curved intravascular tissue grasping forceps provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the bent front end of the adjustable curved intravascular tissue grasping forceps provided by the present invention;

[0030] Figure 4 This is a schematic cross-sectional view of the elastic tube provided by the present utility model;

[0031] Figure 5 Provided by the utility model Figure 2 Enlarged view of point A in the middle.

[0032] In the picture:

[0033] 1. Blood vessels; 101. Close-range operation points; 102. Long-range operation points;

[0034] 2. Elastic tube; 201. Lubricating layer;

[0035] 3. Clamping end; 301. U-shaped clamp; 302. Clamping claw;

[0036] 4. Operating end; 41. Actuating handle; 411. First base; 412. Thumb ring; 413. Movable handle; 414. First rotating shaft; 415. Long slot; 416. Actuating wire; 42. Control handle; 421. Rotating ring; 422. Slider; 423. Second rotating shaft; 424. Pull wire; 425. Second base; 426. Guide rail; 427. Stop block;

[0037] 5. Sheath. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] The core of the utility model is to provide an adjustable curved intravascular tissue grasping forceps. By setting an elastic tube and connecting a traction line to the front end of the inner wall of the elastic tube, the self-righting effect of the elastic tube and the traction effect of the rear end of the traction line are used to achieve the function of adjusting the direction of the front end clamp in the lumen, thereby solving the problem that tissue is difficult to grasp at a remote operation point.

[0040] Please refer to Figure 2-Figure 5 , an adjustable curved intravascular tissue grasping forceps, comprising:

[0041] The elastic tube 2 is preferably a polymer tube, a metal braided tube, or a colloid tube with a spring integrally molded inside;

[0042] The clamping end 3 is provided at the front end of the elastic tube 2 and includes a clamping claw 302;

[0043] The operating end 4 is arranged at the tail end of the elastic tube 2, and includes an actuating handle 41 for driving the clamping end 3 to move, and several groups of control handles 42 for controlling the direction adjustment of the front end of the elastic tube 2; the control handle 42 includes a second base 425, a slider 422 that moves along the center line direction of the second base 425, and a traction line 424 that passes through the elastic tube 2; the front end of the traction line 424 is fixedly connected to the front end of the inner wall of the elastic tube 2, and the rear end is fixedly connected to the slider 422; and the connection points of the several groups of traction lines 424 and the elastic tube 2 are arranged in a circular array about the center line of the elastic tube 2.

[0044] When grasping tissue in the blood vessel 1, an instrument is often used to intervene in the blood vessel 1 to reach the lesion location and grasp the lesion tissue. In this process, the sheath 5 is first inserted into the blood vessel, and the tissue grasping forceps are inserted into the blood vessel 1 along the sheath 5. It takes a certain amount of time for the forceps to pass through the blood vessel 1 before reaching the lesion. Figure 1 As shown, if the tissue to be grasped is at the close-range operation point 101, that is, the intervention point is close to the lesion position, and the blood vessel 1 between the intervention point and the tissue to be grasped is a straight tube, then the instrument is more convenient to penetrate and the operation is simpler; but if the lesion position is at the far-range operation point 102, that is, the intervention point is far from the lesion position, and the blood vessel 1 between the intervention point and the tissue to be grasped is curved, or has a large curvature, then after the instrument intervenes, it is more difficult to pass through, and after reaching the position of the tissue to be grasped, since the clamping end 3 cannot face the tissue to be grasped, the clamping effect of the tissue to be grasped is not ideal, and multiple clampings are required to ensure that the tissue to be grasped is cleanly cleared.

[0045] Therefore, the elastic tube 2 and the traction line 424 provided in the elastic tube 2 work together. By pulling the rear end of the traction line 424, the front end of the elastic tube 2 changes its direction. When the traction line 424 is released, the elastic tube 2 can return to its straight state under its own action, facilitating the next direction adjustment.

[0046] In the present application, a control handle 42 is added to the operating end 4, which is specifically used for pulling and releasing the traction wire 424, thereby facilitating the direction adjustment of the front end of the elastic tube 2. In the present application, a plurality of traction wires 424 are connected to the front end of the elastic tube 2, and the connection points are arranged in a circular array about the center line of the elastic tube 2. This allows the elastic tube 2 to be bent in the corresponding direction by pulling different traction wires 424, thereby obtaining more adjustment directions for the elastic tube 2 and the clamping end 3.

[0047] The number of traction lines 424 is preferably 1, 2, 3, 4, 5, 6, 7, or 8. For example, in some embodiments, only one traction line 424 is provided, which is suitable for biological lumens with smaller bends or that bend only to one side. In other embodiments, two or more traction lines 424 are provided, and the connection points between the traction lines 424 and the front end of the elastic tube 2 are arranged in a circular array with respect to the center line of the elastic tube 2. By pulling different traction lines 424, the elastic tube 2 is bent in the corresponding direction. By increasing the number of traction lines 424, the elastic tube 2 can obtain more adjustable directions, thereby being suitable for biological lumens with more bends and more complex directions.

[0048] In some embodiments, such as Figure 2 As shown, a rotating ring 421 is coaxially rotatably provided on the outside of the second base 425. The inner wall of the rotating ring 421 is connected to the outer peripheral wall of the slider 422 by a thread. When the rotating ring 421 rotates, the slider 422 can be driven by the thread to move along the center line direction of the second base 425.

[0049] Specifically, the inner ring of the rotating ring 421 is provided with threads, the outer surface of the slider 422 is provided with threads, and a guide rail 426 is provided on the outer periphery of the second base 425. The length direction of the guide rail 426 is consistent with the center line direction of the second base 425. The slider 422 is slidably installed on the guide rail 426 to ensure the stability of the movement of the slider 422. In addition, limit blocks 427 are provided at both ends of the guide rail 426 to limit the maximum displacement of the slider 422.

[0050] Through the threaded connection between the rotating ring 421 and the slider 422, when the rotating ring 421 rotates, it can drive the slider 422 to slide along the guide rail 426, thereby dragging the traction line 424, and then completing the direction adjustment of the front end of the elastic tube 2. In addition, with the help of the self-locking feature of the threaded connection, when the traction line 424 drags the slider 422 in the reverse direction, it will not drive the rotating ring 421 to rotate in the reverse direction, that is, it prevents the traction line 424 from automatically resetting, thereby ensuring that the angle of the front end of the elastic tube 2 is stable.

[0051] In some embodiments, two sets of pulling wires 424 are connected to the slider 422. One set of pulling wires 424 is directly connected to the slider 422, and the other set of pulling wires 424 passes around the second rotating shaft 423 at the rear end of the second base 425, then returns to connect to the slider 422. The connection points of the two sets of pulling wires 424 with the elastic tube 2 are coplanar with the centerline of the elastic tube 2.

[0052] That is, when the slider 422 moves, one set of pulling wires 424 is in a dragging state, while the other set of pulling wires 424 is in a released state. Furthermore, the connection positions between the front ends of the two sets of pulling wires 424 and the inner wall of the elastic tube 2 are arranged in a circular array about the center line of the elastic tube 2. That is, the pulling wires 424 in the dragging state drive the elastic tube 2 to bend, while the pulling wires 424 on the symmetrical side are in a released state, which does not affect the aforementioned bending.

[0053] In this embodiment, part of the design divides the slider 422 into two groups of separate individuals that move synchronously, and correspondingly sets two groups of guide rails 426. The two groups of traction lines 424 are respectively connected to different separate individuals, which helps to reduce the volume of a single slider 422 and then reduce the volume of the entire device, thereby improving the flexibility of the device.

[0054] In some embodiments, if an even number of pull lines 424 are used, two pull lines 424 share the same slider 422. For example, if four groups of pull lines 424 are used, Figure 4 As shown, four groups of pulling wires 424 are arranged in a circular array, and two groups of pulling wires 424 symmetrical about the center line of the elastic tube 2 share the same slider 422;

[0055] If an odd number of pulling wires 424 is used, preferably a single pulling wire 424 is connected to a slider 422, or one of the pulling wires 424 is connected to a slider 422, and the remaining pulling wires 424 are grouped in pairs and share a slider 422. It is worth noting that the connection points between the two groups of pulling wires 424 using the same slider 422 and the elastic tube 2 must be coplanar with the center line of the elastic tube 2.

[0056] In practical applications, since the traction line 424 is passed through the elastic tube 2, and the slider 422 needs to contact the rotating ring 421, the slider 422 can be optionally built into the central cavity of the second base 425, and a long groove is provided on the surface of the second base 425 along the axial direction, and an extension arm is provided on the side wall of the slider 422 to pass through the long groove. The side of the extension arm is provided with a thread that contacts the rotating ring 421, and the slider 422 is also provided with a through hole along the center line direction for the other traction line 424 or the actuating line 416 to pass through.

[0057] Similarly, in some embodiments, the slider 422 is directly slidably mounted on the outer peripheral surface of the second base 425 , and the pulling wire 424 passes through the radial through hole of the second base 425 and is connected to the slider 422 .

[0058] like Figure 2 As shown, the second bases 425 in several groups of control handles 42 are coaxially fixedly connected, and the traction line 424 passes through the second base 425, that is, all the control handles 42 are arranged in series, specifically, all the rotating rings 421 share the same second base 425, and the axes of all the rotating rings 421 overlap;

[0059] In some embodiments, all control handles 42 are arranged in parallel, that is, all second bases 425 are arranged divergently and converge at one point in the middle, and only one rotating ring 421 is set in each second base 425. The above two methods both fall within the scope of protection of this application.

[0060] In some embodiments, a channel tube is provided on the outside of the pulling line 424, and the channel tube is provided in contact with the inner wall of the elastic tube 2, or the channel tube is provided inside the wall of the elastic tube 2;

[0061] Each set of traction wires 424 is independently provided with a channel tube outside thereof for the traction wires 424 to move inside thereof, thereby avoiding interference between different traction wires 424 during movement, and avoiding interference between the traction wires 424 and the actuation wire 416;

[0062] At the same time, by arranging the channel tube in the wall of the elastic tube 2, the occupancy of the inner cavity of the elastic tube 2 can be reduced, thereby facilitating reduction of the tube diameter.

[0063] In some embodiments, as Figure 2 and Figure 3 As shown, the actuating handle 41 includes a first base 411, a movable handle 413 that moves axially along the first base 411, and two actuating wires 416 that pass through the elastic tube 2. The front ends of the actuating wires 416 are connected to the extension arms of the clamping jaws 302, and the rear ends are connected to the movable handle 413. Pulling the actuating wires 416 can drive the clamping jaws 302 to close, and releasing the actuating wires 416 can open the clamping jaws 302.

[0064] The clamping jaw 302 has two claw bodies, which are connected by a torsion spring. The lever principle is adopted. When the actuating wire 416 is dragged toward the rear end, the angle of the extension arm is reduced, that is, the two claw bodies are clamped. When the actuating wire 416 is released, the two claw bodies open under the action of the torsion spring. In the actuating handle 41, the dragging and release of the actuating wire 416 are realized through the relative movement of the movable handle 413 and the first base 411.

[0065] In some embodiments, the rear ends of the two actuating wires 416 are connected and pass around the first rotating shaft 414 inside the movable handle 413;

[0066] That is, the two actuating wires 416 form one actuating wire 416, and after the actuating wire 416 passes around the first rotating shaft 414, the two ends are respectively connected to the extension arms of the two claws. When the spring steel is in a bent state, the actuating wire 416 is dragged, and the actuating wire 416 can move around the first rotating shaft 414, so that the forces acting on the two claws are consistent, that is, the clamping of the clamping jaws 302 is ensured to be stable when the elastic tube 2 is in a bent state.

[0067] The first base 411 is a hollow tube and is provided with a long slot 415 in the radial direction. The length direction of the long slot 415 is consistent with the center line direction of the first base 411. The first rotating shaft 414 passes through the long slot 415.

[0068] That is, the actuating wire 416 is passed through the inside of the first base 411, so that when operating the actuating handle 41, the actuating wire 416 will not be gripped, ensuring that the clamping end 3 works smoothly and stably, and after the first rotating shaft 414 passes through the long groove 415, it can limit the movable handle 413 from rotating around the first base 411, avoiding excessive entanglement of the two actuating wires 416.

[0069] In some embodiments, as Figure 2 As shown, a thumb ring 412 is fixedly provided at the tail end of the first base 411, and an annular groove is provided on the outer periphery of the movable handle 413. During operation, the thumb is inserted into the thumb ring 412 to complete the grip of the first base 411, and the index finger and middle finger are clamped in the annular groove of the movable handle 413 from both sides to complete the clamping of the movable handle 413. By controlling the angle between the thumb, the middle finger and the index finger, the relative displacement of the movable handle 413 and the first base 411 is controlled.

[0070] In some embodiments, the first base 411 and the second base 425 are relatively fixedly arranged, and the actuating wire 416 passes through the hollow cavity of the second base 425; or the first base 411 and the second base 425 are relatively independently arranged, and the first base 411 and the second base 425 are respectively relatively fixedly connected to the tail end of the elastic tube 2.

[0071] That is, in some implementations, such as Figure 2 As shown, the actuating handle 41 and the control handle 42 are integrated as a whole. In some embodiments, the actuating handle 41 and the control handle 42 are independently provided, so that two persons can operate them separately to clamp the tissue in the biological lumen.

[0072] In some embodiments, the clamping end 3 further includes a U-shaped clip 301, the intersection of the clamping jaws 302 and the open end of the U-shaped clip 301 are connected via a rotating shaft, and the other end of the U-shaped clip 301 is fixedly mounted to the front end of the elastic tube 2;

[0073] That is, two sets of claws are placed in the opening of the U-shaped clamp 301. The claw body is a lever structure. The clamping part and the extension arm are located at both ends of the rotating shaft. Pulling the extension arm to reduce the angle of the clamping part can complete the clamping of the clamping part.

[0074] At the same time, the other end of the U-shaped clip 301 is connected to the front end of the elastic tube 2 through a bushing. When the installation is completed, the U-shaped clip 301 cannot rotate around the elastic tube 2. However, before installation, it can rotate relatively to ensure the relative angle between the clamping end 3 and the operating end 4 for easy operation.

[0075] At the same time, in some embodiments, the elastic tube 2 is covered with a lubricating layer 201. The lubricating layer 201 is mainly a polymer material covering the elastic tube 2, such as PTFE, FEP, etc., to reduce the resistance of the elastic tube 2 passing through the biological lumen.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The above describes in detail the adjustable curved intravascular tissue grasping forceps provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An adjustable curved intravascular tissue grasping forceps, characterized in that: include: elastic tube (2); A clamping end (3) is provided at the front end of the elastic tube (2) and includes a clamping claw (302); An operating end (4) is arranged at the tail end of the elastic tube (2), comprising an actuating handle (41) for driving the clamping end (3) to move, and several groups of control handles (42) for controlling the adjustment of the front end direction of the elastic tube (2); the control handle (42) comprises a second base (425), a slider (422) moving along the center line direction of the second base (425), and a traction line (424) passing through the elastic tube (2); the front end of the traction line (424) is fixedly connected to the front end of the inner wall of the elastic tube (2), and the rear end is fixedly connected to the slider (422); and the connection points of the several groups of traction lines (424) and the elastic tube (2) are arranged in a circular array about the center line of the elastic tube (2).

2. The adjustable curved intravascular tissue grasping forceps according to claim 1, characterized in that: A rotating ring (421) is coaxially rotated on the outside of the second base (425), and the inner wall of the rotating ring (421) is connected to the outer peripheral wall of the slider (422) via a thread. When the rotating ring (421) rotates, the slider (422) can be driven by the thread to move along the center line direction of the second base (425).

3. The adjustable curved intravascular tissue grasping forceps according to claim 2, characterized in that: Two groups of traction lines (424) are connected to the slider (422), one group of traction lines (424) is directly connected to the slider (422), and the other group of traction lines (424) bypasses the second rotating shaft (423) at the tail end of the second base (425) and is connected to the slider (422) after being turned back; the connection points of the two groups of traction lines (424) and the elastic tube (2) are coplanar with the center line of the elastic tube (2).

4. The adjustable curved intravascular tissue grasping forceps according to claim 2, characterized in that: The second base bodies (425) in the plurality of groups of control handles (42) are coaxially fixedly connected, and the traction line (424) passes through the second base bodies (425).

5. The adjustable curved intravascular tissue grasping forceps according to claim 2, characterized in that: A channel tube is provided outside the pulling line (424), and the channel tube is arranged to fit the inner wall of the elastic tube (2), or the channel tube is arranged inside the tube wall of the elastic tube (2).

6. The adjustable curved intravascular tissue grasping forceps according to claim 1, characterized in that: The actuating handle (41) comprises a first base (411), a movable handle (413) that moves axially along the first base (411), and two actuating wires (416) that pass through the elastic tube (2); the front end of the actuating wire (416) is connected to the extension arm of the clamping jaw (302), and the rear end is connected to the movable handle (413); pulling the actuating wire (416) can drive the clamping jaw (302) to close, and releasing the actuating wire (416) can cause the clamping jaw (302) to open.

7. The adjustable curved intravascular tissue grasping forceps according to claim 6, characterized in that: The rear ends of the two actuating wires (416) are connected and pass around the first rotating shaft (414) inside the movable handle (413).

8. The adjustable curved intravascular tissue grasping forceps according to claim 7, characterized in that: The first base (411) is a hollow tube and is provided with a long groove (415) running through it in a radial direction. The length direction of the long groove (415) is consistent with the center line direction of the first base (411). The first rotating shaft (414) passes through the long groove (415).

9. The adjustable curved intravascular tissue grasping forceps according to claim 6, characterized in that: A thumb ring (412) is fixedly provided at the tail end of the first base (411), and an annular groove is provided on the outer periphery of the movable handle (413).

10. The adjustable curved intravascular tissue grasping forceps according to claim 6, characterized in that: The first base (411) and the second base (425) are relatively fixedly arranged, and the actuating line (416) passes through the hollow cavity of the second base (425); or the first base (411) and the second base (425) are relatively independently arranged, and the first base (411) and the second base (425) are respectively relatively fixedly connected to the tail end of the elastic tube (2).

11. The adjustable curved intravascular tissue grasping forceps according to any one of claims 1 to 10, characterized in that: The clamping end (3) further comprises a U-shaped clamp (301), the intersection of the clamping jaws (302) and the open end of the U-shaped clamp (301) are connected via a rotating shaft, and the other end of the U-shaped clamp (301) is fixedly mounted to the front end of the elastic tube (2).

Images