Controllable bending catheter for use in an intervention

Abstract

The application provides an intervention treatment controllable bending catheter, and relates to the technical field of medical catheters. The intervention treatment controllable bending catheter comprises a cannula, an adjusting assembly is installed on the cannula, a large fastening ring is threadedly connected to the front of the adjusting assembly, a stabilizing assembly is threadedly connected to the front of the large fastening ring, a rear section assembly is fixedly installed at the front of the stabilizing assembly, a plurality of middle section assemblies are installed at the front of the rear section assembly, and a connecting outer tube and a connecting inner tube are installed between adjacent middle section assemblies. In use, the front section assembly is inserted into a human body, the front section assembly, the middle section assemblies and the rear section assembly are in a non-forced connection state, the insertion into the human body is facilitated, after the insertion, the adjusting assembly and the large fastening ring are rotated to tighten the steel wire, the front section assembly, the middle section assemblies and the rear section assembly enter a forced connection state under the action of the steel wire, and the front section assembly, the middle section assemblies and the rear section assembly are integrated, thereby facilitating subsequent operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical catheter, in particular to a controllable bending catheter for interventional therapy. BACKGROUND

[0002] Interventional radiology, also known as interventional therapy, is a new discipline combining image diagnosis and clinical treatment, which has developed rapidly in recent years. It is a series of techniques that use puncture needles, catheters and other interventional devices to introduce specific instruments into the human body through natural orifices or small incisions for minimally invasive treatment under the guidance and monitoring of imaging equipment such as digital subtraction angiography, CT, ultrasound and magnetic resonance. It has become one of the three major clinical disciplines along with traditional internal medicine and surgery.

[0003] The existing interventional therapy needs to insert a catheter, and then insert a treatment cannula along the inside of the catheter. During the catheter insertion process, the insertion end of the catheter cannot be actively and flexibly bent, and the doctor needs to repeatedly try different insertion angles to find the correct direction. However, the human body is complex, and there are many branches in the organs, which makes it very inconvenient for interventional therapy. It often requires experienced doctors to operate carefully, which is difficult and the inserted catheter is not stable enough and is prone to misplacement in the complex human body. SUMMARY

[0004] (I) Technical problems solved

[0005] To solve the problems of the existing catheter that cannot be actively and flexibly bent, the inserted catheter is not stable enough and is prone to misplacement in the complex human body, the present application provides a controllable bending catheter for interventional therapy.

[0006] (II) Technical solutions

[0007] To achieve the above purpose, the present application realizes the following technical solutions: a controllable bending catheter for interventional therapy, comprising a cannula, an adjusting assembly is installed on the cannula, a large fastening ring is threadedly connected in front of the adjusting assembly, a stabilizing assembly is threadedly connected in front of the large fastening ring, a rear segment assembly is fixedly installed in front of the stabilizing assembly, a plurality of middle segment assemblies are installed in front of the rear segment assembly, a connecting outer tube and a connecting inner tube are installed between adjacent middle segment assemblies, and a front segment assembly is installed in front of the connecting outer tube and the connecting inner tube.

[0008] Preferably, the adjusting assembly comprises a rotating ball, an adjusting disc, a pipe hole, a front ring, a clamping groove, a rotating ring, an inner hole, an outer guide shaft and a clamping ring, the rear side wall of the rotating ball is fixedly connected with the adjusting disc, the inside of the rotating ball is provided with the pipe hole for inserting the pipe, the rotating ball is clamped with the front ring, the spherical surface of the rotating ball is provided with the clamping groove, the inside of the clamping groove is installed with the rotating ring, the circumference of the rotating ring is provided with a plurality of inner holes, the inside of the inner hole is rotatably connected with the outer guide shaft, and the inner side of the rotating ring is fixedly connected with the clamping ring.

[0009] By adopting the above technical scheme, the adjusting disc can operate the rotating direction and angle of the rotating ball in the inside of the front ring, the spherical surface of the rotating ball is rotatably connected with the rotating ring, and the clamping ring can make the rotating ring rotate on the rotating ball and rotate together with the rotating ball, so that the flexibility is high.

[0010] Preferably, the stabilizing assembly comprises a stabilizing ring, a limiting ring, a front hole, a rear pipe, an outer mounting seat, a winding shaft and an outer fastening ring, a plurality of limiting rings are fixedly connected to the inside of the front side wall of the stabilizing ring, the front side wall of the stabilizing ring is provided with the front hole, the rear side wall of the stabilizing ring is fixedly connected with the rear pipe, a plurality of outer mounting seats are fixedly connected to the rear side wall of the stabilizing ring, the inside of the outer mounting seat is rotatably connected with the winding shaft, and the left and right ends of the winding shaft are threadedly connected with the outer fastening ring, and the outer fastening ring is located outside the outer mounting seat.

[0011] By adopting the above technical scheme, the limiting ring is used for limiting the rotating ball, the front end of the winding shaft is connected with the steel wire, and the winding shaft is used for winding the steel wire. By screwing the outer fastening rings on both sides, the winding shaft can be limited and fixed in the inside of the outer mounting seat, and the winding shaft is used for locking.

[0012] Preferably, the front of the large fastening ring is threadedly connected with the front ring, and the rear of the large fastening ring is threadedly connected with the rear pipe.

[0013] By adopting the above technical scheme, the rotating front ring can move the adjusting assembly forward and backward along the large fastening ring. When the adjusting assembly moves to the appropriate position, the large fastening ring can be used to lock the front ring and the rear pipe, so as to fix the position of the front ring.

[0014] Preferably, the rear segment assembly comprises a rear segment outer pipe, a rear segment inner pipe, a rear segment support ring, a rear segment inner seat, a rear segment guide shaft and a rear segment ball cover, the inner side of the rear segment outer pipe is installed with the rear segment inner pipe, the rear segment outer pipe and the rear segment inner pipe are fixedly connected with the stabilizing ring, the rear segment support ring is fixedly connected between the rear segment outer pipe and the rear segment inner pipe, a plurality of rear segment inner seats are fixedly connected to the circumference of the rear segment inner pipe, the inside of the rear segment inner seat is rotatably connected with the rear segment guide shaft, and a plurality of rear segment ball covers are fixedly connected to the front of the rear segment support ring.

[0015] By adopting the technical scheme, the rear segment assembly is fixedly connected with the stabilizing assembly at the last end, and is connected with the middle segment assembly through the rear segment ball cover, and the steel wire is wound on the rear segment guide shaft.

[0016] Preferably, the middle segment assembly comprises a middle segment outer tube, a middle segment inner tube, a middle segment support ring, a middle segment inner seat, a middle segment guide shaft, a middle segment ball cover and a middle segment ball rod, the inner side of the middle segment outer tube is provided with the middle segment inner tube, two middle segment support rings are fixedly connected between the middle segment outer tube and the middle segment inner tube, a plurality of middle segment inner seats are fixedly connected on the circumferential surface of the middle segment inner tube, the middle segment guide shaft is rotatably connected in the middle segment inner seat, a plurality of middle segment ball covers are fixedly connected in front of the front middle segment support ring, and a plurality of middle segment ball rods are fixedly connected behind the rear middle segment support ring.

[0017] By adopting the technical scheme, the catheter main body is composed of a plurality of middle segment assemblies to form a plurality of movement segments, and adjacent middle segment assemblies are connected through the middle segment ball cover and the middle segment ball rod, so that the device can form a fixed whole when being tightened and can be bent and deformed when being loosened, and the device has flexibility and connection rigidity, and the middle segment assembly is limited in bending in the body and is not easy to bend when being inserted into the human body.

[0018] Preferably, the front segment assembly comprises a front segment outer tube, a front segment inner tube, a front segment support ring, a front segment inner seat, a front segment guide shaft, a front segment ball rod and a catheter head, the inner side of the front segment outer tube is provided with the front segment inner tube, the front segment support ring is fixedly connected between the front segment outer tube and the front segment inner tube, a plurality of front segment inner seats are fixedly connected on the circumferential surface of the front segment inner tube, the front segment guide shaft is rotatably connected in the front segment inner seat, a plurality of front segment ball rods are fixedly connected behind the rear front segment support ring, and the catheter head is fixedly connected in front of the front front segment support ring.

[0019] By adopting the technical scheme, the front segment assembly is convenient for the catheter to extend out from the inside, and when the front segment assembly is turned, the catheter head faces different directions, so that the catheter can be guided to different positions and directions, and the catheter can be conveniently extended out of the catheter head to facilitate interventional treatment.

[0020] Preferably, a connecting outer tube is fixedly connected between adjacent rear segment outer tubes, middle segment outer tubes and front segment outer tubes, a connecting inner tube is fixedly connected between adjacent rear segment inner tubes, middle segment inner tubes and front segment inner tubes, the rear segment ball cover, the middle segment ball cover, the middle segment ball rod and the front segment ball rod are located between the connecting outer tube and the connecting inner tube, the rear segment ball cover and the middle segment ball rod are front and rear clamped, the middle segment ball cover and the middle segment ball rod in adjacent middle segment assemblies are front and rear clamped and matched, and the front segment ball rod and the middle segment ball cover are front and rear clamped.

[0021] Preferably, the connecting outer tube and the connecting inner tube are made of TPU material.

[0022] By adopting the technical scheme, the connecting outer pipe and the connecting inner pipe connect the rear segment assembly, the middle segment assembly and the front segment assembly together, complete pipe surfaces are formed inside and outside, and the middle segment ball cover and the middle segment ball rod inside are protected, the catheter is conveniently inserted to the target position when the catheter is inserted.

[0023] Preferably, a steel wire is arranged inside the rear segment assembly, the middle segment assembly and the front segment assembly, a front end of the steel wire is fixedly connected with the front segment support ring at the front end, and is wound on the front segment guide shaft, the middle segment guide shaft and the rear segment guide shaft in sequence, and the front end of the steel wire penetrates through the limiting ring and is fixed on the winding shaft after winding around the outer guide shaft.

[0024] By adopting the technical scheme, the steel wire is wound on the front segment guide shaft, the middle segment guide shaft, the rear segment guide shaft and the outer guide shaft in sequence from the front to the back, and the corresponding steel wire is wound when the winding shaft is rotated, and the front end of the front segment assembly is correspondingly bent, so that the device is conveniently inserted into the complex human body.

[0025] (Three) beneficial effects

[0026] The application provides a controllable bending catheter for interventional therapy.

[0027] 1) In use, the front segment assembly is inserted into the human body, the front segment assembly, the middle segment assembly and the rear segment assembly are in a non-forced connection state, the device is conveniently inserted according to the human body structure, after insertion, the steel wire is tensioned by rotating the adjusting assembly and the large fastening ring, the front segment assembly, the middle segment assembly and the rear segment assembly are in a forced connection state under the action of the steel wire, and the device is integrated, so that subsequent operation is facilitated.

[0028] 2) When the device is in the forced connection state, the rotating ball is rotated inside the stabilizing ring by rotating the adjusting assembly, and the steel wire connected to the rotating ring is adjusted in rotation, the steel wire has different tension degrees at different points, and the front segment assembly, the middle segment assembly and the rear segment assembly are bent in different degrees by the steel wire through the winding shaft outside, so that the controllable bending of the catheter is realized.

[0029] 3) The front segment assembly, the middle segment assembly and the rear segment assembly are connected by the ball rod and the ball cover, and are turned in different directions under the pulling of the steel wire, and have high flexibility, and the state is fixed under the action of the outer fastening ring after the controllable bending is completed, and the stability is high. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a front view of the application;

[0031] Figure 2 It is a cross-sectional structure schematic view of the adjusting assembly of the application;

[0032] Figure 3 For Figure 2 Enlarged view of the middle A;

[0033] Figure 4 For the cross-sectional structure of the stable assembly of the application;

[0034] Figure 5 For the cross-sectional structure of the rear assembly of the application;

[0035] Figure 6 For the cross-sectional structure of the middle assembly of the application;

[0036] Figure 7 For the cross-sectional structure of the front assembly of the application;

[0037] Figure 8 For the three-dimensional Figure 1 of the application;

[0038] Figure 9 For the three-dimensional Figure 2 of the application;

[0039] Figure 10 For the cross-sectional structure of the stable assembly of the application;

[0040] 1, cannula; 2, adjusting assembly; 3, large fastening ring; 4, stable assembly; 5, rear assembly; 6, middle assembly; 7, connecting outer tube; 8, connecting inner tube; 9, front assembly; 10, steel wire;

[0041] 201, rotating ball; 202, adjusting disc; 203, tube hole; 204, front ring; 205, clamping groove; 206, rotating ring; 207, inner hole; 208, outer guide shaft; 209, clamping ring;

[0042] 401, stable ring; 402, limiting ring; 403, front hole; 404, rear tube; 405, outer mounting seat; 406, winding shaft; 407, outer fastening ring;

[0043] 501, rear outer tube; 502, rear inner tube; 503, rear support ring; 504, rear inner seat; 505, rear guide shaft; 506, rear ball cover;

[0044] 601, middle outer tube; 602, middle inner tube; 603, middle support ring; 604, middle inner seat; 605, middle guide shaft; 606, middle ball cover; 607, middle ball rod;

[0045] 901, front outer tube; 902, front inner tube; 903, front support ring; 904, front inner seat; 905, front guide shaft; 906, front ball rod; 907, catheter head. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0047] Please refer to Figures 1 to 10 The present application provides a technical solution: a controllable bending catheter for interventional therapy, comprising a cannula 1, an adjusting assembly 2 is installed on the cannula 1, a large fastening ring 3 is threadedly connected to the front of the adjusting assembly 2, a stabilizing assembly 4 is threadedly connected to the front of the large fastening ring 3, a rear segment assembly 5 is fixedly installed at the front of the stabilizing assembly 4, a plurality of middle segment assemblies 6 are installed at the front of the rear segment assembly 5, a connecting outer tube 7 and a connecting inner tube 8 are installed between adjacent middle segment assemblies 6, and a front segment assembly 9 is installed at the front of the connecting outer tube 7 and the connecting inner tube 8.

[0048] The adjusting assembly 2 comprises a rotating ball 201, an adjusting disc 202, a tube hole 203, a front ring 204, a clamping groove 205, a rotating ring 206, an inner hole 207, an outer guide shaft 208 and a clamping ring 209, the adjusting disc 202 is fixedly connected to the rear side wall of the rotating ball 201, the tube hole 203 is formed in the interior of the rotating ball 201 to facilitate insertion of the cannula 1, the front ring 204 is clamped to the rotating ball 201, the clamping groove 205 is formed in the spherical surface of the rotating ball 201, the rotating ring 206 is installed in the interior of the clamping groove 205, the inner hole 207 is formed in the circumferential surface of the rotating ring 206, the outer guide shaft 208 is rotatably connected to the interior of the inner hole 207, and the clamping ring 209 is fixedly connected to the inner side of the rotating ring 206.

[0049] The adjusting disc 202 can operate the rotating ball 201 to rotate in the interior of the front ring 204 in a direction and at an angle, the rotating ring 206 is rotatably connected to the spherical surface of the rotating ball 201, and the clamping ring 209 enables the rotating ring 206 to rotate on the rotating ball 201 and also to rotate together with the rotating ball 201, so that the flexibility is high.

[0050] The stabilizing assembly 4 comprises a stabilizing ring 401, a limiting ring 402, a front hole 403, a rear tube 404, an outer mounting seat 405, a winding shaft 406 and an outer fastening ring 407, the limiting ring 402 is fixedly connected to the interior of the front side wall of the stabilizing ring 401, the front hole 403 is formed in the front side wall of the stabilizing ring 401, the rear tube 404 is fixedly connected to the rear side wall of the stabilizing ring 401, the outer mounting seat 405 is fixedly connected to the rear side wall of the stabilizing ring 401, the winding shaft 406 is rotatably connected to the interior of the outer mounting seat 405, the outer fastening ring 407 is threadedly connected to the left and right ends of the winding shaft 406, and the outer fastening ring 407 is located on the outer side of the outer mounting seat 405.

[0051] The limiting ring 402 is used to limit the rotation of the ball 201. The winding shaft 406 is connected to the front end of the steel wire 10 and is used to wind the steel wire 10. The outer fastening ring 407 on both sides is twisted to limit and fix the winding shaft 406 in the inner part of the outer mounting seat 405, so as to lock the winding shaft 406.

[0052] The front of the large fastening ring 3 is screwed with the front ring 204, and the rear of the large fastening ring 3 is screwed with the rear tube 404.

[0053] The front ring 204 can be moved forward and backward along the large fastening ring 3 to adjust the assembly 2. When the assembly 2 is moved to the appropriate position, the large fastening ring 3 can be used to lock the front ring 204 and the rear tube 404, so as to fix the position of the front ring 204.

[0054] The rear segment assembly 5 includes a rear segment outer tube 501, a rear segment inner tube 502, a rear segment support ring 503, a rear segment inner seat 504, a rear segment guide shaft 505, and a rear segment ball cover 506. The inner side of the rear segment outer tube 501 is installed with the rear segment inner tube 502. The rear segment outer tube 501 and the rear segment inner tube 502 are fixedly connected with the stabilizing ring 401. The rear segment support ring 503 is fixedly connected between the rear segment outer tube 501 and the rear segment inner tube 502. A plurality of rear segment inner seats 504 are fixedly connected on the circumferential surface of the rear segment inner tube 502. The rear segment guide shaft 505 is rotatably connected in the inner part of the rear segment inner seat 504. A plurality of rear segment ball covers 506 are fixedly connected in front of the front of the rear segment support ring 503.

[0055] The rear segment assembly 5 is fixedly connected with the stabilizing assembly 4 at the last end, and is connected with the middle segment assembly 6 through the rear segment ball cover 506 at the front end. The steel wire 10 is wound on the rear segment guide shaft 505.

[0056] The middle segment assembly 6 includes a middle segment outer tube 601, a middle segment inner tube 602, a middle segment support ring 603, a middle segment inner seat 604, a middle segment guide shaft 605, a middle segment ball cover 606, and a middle segment ball rod 607. The inner side of the middle segment outer tube 601 is installed with the middle segment inner tube 602. Two middle segment support rings 603 are fixedly connected between the middle segment outer tube 601 and the middle segment inner tube 602. A plurality of middle segment inner seats 604 are fixedly connected on the circumferential surface of the middle segment inner tube 602. The middle segment guide shaft 605 is rotatably connected in the inner part of the middle segment inner seat 604. A plurality of middle segment ball covers 606 are fixedly connected in front of the front of the middle segment support ring 603. A plurality of middle segment ball rods 607 are fixedly connected in the rear of the rear of the middle segment support ring 603.

[0057] A plurality of middle segment assemblies 6 are used to form the main body of the catheter, forming a plurality of movement segments. Adjacent middle segment assemblies 6 are connected by the middle segment ball cover 606 and the middle segment ball rod 607. When the device is tightened, a fixed whole body can be formed. When it is loosened, it can be bent and deformed, and has flexibility and connection rigidity. When it is inserted into the human body, the middle segment assembly 6 is limited in bending in the body and is not easy to bend.

[0058] The front section assembly 9 comprises a front section outer tube 901, a front section inner tube 902, a front section support ring 903, a front section inner seat 904, a front section guide shaft 905, a front section ball rod 906 and a catheter head 907, the inner side of the front section outer tube 901 is provided with the front section inner tube 902, the front section support ring 903 is fixedly connected between the front section outer tube 901 and the front section inner tube 902, a plurality of front section inner seats 904 are fixedly connected on the circumferential surface of the front section inner tube 902, the front section guide shaft 905 is rotatably connected inside the front section inner seat 904, a plurality of front section ball rods 906 are fixedly connected at the rear of the rear front section support ring 903, and the catheter head 907 is fixedly connected at the front of the front front section support ring 903.

[0059] The front section assembly 9 facilitates the extension of the catheter 1 from the inside, when the front section assembly 9 is turned, the catheter head 907 faces different directions, facilitating the guidance of the catheter 1 to different positions and directions, the catheter 1 extends from the catheter head 907, facilitating the interventional treatment.

[0060] The adjacent rear section outer tube 501, the middle section outer tube 601 and the front section outer tube 901 are fixedly connected with a connecting outer tube 7, the adjacent rear section inner tube 502, the middle section inner tube 602 and the front section inner tube 902 are fixedly connected with a connecting inner tube 8, the connecting outer tube 7 and the connecting inner tube 8 are made of TPU material, the rear section ball cover 506, the middle section ball cover 606, the middle section ball rod 607 and the front section ball rod 906 are located between the connecting outer tube 7 and the connecting inner tube 8, the rear section ball cover 506 is forwardly and rearwardly connected with the middle section ball rod 607, the middle section ball cover 606 and the middle section ball rod 607 in the adjacent middle section assembly 6 are forwardly and rearwardly connected and matched, and the front section ball rod 906 is forwardly and rearwardly connected with the middle section ball cover 606.

[0061] The connecting outer tube 7 and the connecting inner tube 8 connect the rear section assembly 5, the middle section assembly 6 and the front section assembly 9 together, and form complete pipeline surfaces inside and outside, which can be bent and deformed according to the adjustment, and protect the middle section ball cover 606 and the middle section ball rod 607 inside, facilitating the direct insertion of the catheter 1 to the target position.

[0062] The steel wire 10 is installed inside the rear section assembly 5, the middle section assembly 6 and the front section assembly 9, the front end of the steel wire 10 is fixedly connected with the frontmost front section support ring 903, and is wound on the front section guide shaft 905, the middle section guide shaft 605 and the rear section guide shaft 505 in sequence, and the front end of the steel wire 10 penetrates through the limiting ring 402 and is fixed on the winding shaft 406 after winding around the outer guide shaft 208.

[0063] The steel wire 10 is wound on the front guide shaft 905, the middle guide shaft 605, the rear guide shaft 505 and the outer guide shaft 208 from front to back, and when the winding shaft 406 is rotated, the corresponding steel wire 10 can be wound, and the front end of the front assembly 9 will be bent correspondingly, so that the device is convenient to insert into the complex human body.

[0064] Working principle: in use, the front assembly 9 is inserted into the human body, and the front assembly 9, the middle assembly 6 and the rear assembly 5 are in a non-forced connection state, and can be inserted into the human body structure, after insertion, rotate the front ring 204, make the front ring 204 away from the rear tube 404, until the front assembly 9, the middle assembly 6 and the rear assembly 5 are in a forced connection state under the action of the steel wire 10, and form an integral body between each other, then rotate the large fastening ring 3, lock the front ring 204 and the rear tube 404, at this time, the rotating ball 201 can be rotated by adjusting the disc 202, when the rotating ball 201 is rotated, the steel wire 10 around it will be pulled to different degrees, the front end of the front assembly 9 will be bent in the opposite direction when the adjusting disc 202 is turned to one side, so that the front assembly 9 can be actively steered, realizing controllable bending, facilitating the device to continue to penetrate into the human body, the middle section of the device is not easy to deform under the restriction of the human body, and the front assembly 9 is more easy to bend under operation, when it is needed to penetrate in different directions, only the adjusting disc 202 needs to be operated, until it is stretched into the target position, then rotate the outer fastening ring 407 around it, lock the winding shaft 406 to fix the last orientation of the front assembly 9, then insert the cannula 1 into the pipe hole 203 in the rotating ball 201, and continuously penetrate along the rear assembly 5, the middle assembly 6, the connecting inner tube 8 and the front assembly 9, and finally stretch out of the catheter head 907, which can directly reach the target position for interventional therapy, the device has high flexibility and low operation difficulty, and is not easy to bend after being fixed, and has strong stability.

[0065] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A steerable catheter for use in an intervention, comprising a cannula (1), characterized in that: The cannula (1) is provided with an adjusting assembly (2), the front of the adjusting assembly (2) is threadedly connected with a large fastening ring (3), the front of the large fastening ring (3) is threadedly connected with a stabilizing assembly (4), the front of the stabilizing assembly (4) is fixedly provided with a rear segment assembly (5), the front of the rear segment assembly (5) is provided with a plurality of middle segment assemblies (6), the adjacent middle segment assemblies (6) are provided with connecting outer pipes (7) and connecting inner pipes (8), and the front of the frontmost connecting outer pipe (7) and connecting inner pipe (8) is provided with a front segment assembly (9). The adjusting assembly (2) comprises a rotating ball (201), an adjusting disc (202), a pipe hole (203), a front ring (204), a clamping groove (205), a rotating ring (206), an inner hole (207), an outer guide shaft (208) and a clamping ring (209), the rear side wall of the rotating ball (201) is fixedly connected with the adjusting disc (202), the inner part of the rotating ball (201) is provided with the pipe hole (203) for facilitating the insertion of the cannula (1), the rotating ball (201) is clamped with the front ring (204), the spherical surface of the rotating ball (201) is provided with the clamping groove (205), the clamping groove (205) is provided with the rotating ring (206), the circumferential surface of the rotating ring (206) is provided with a plurality of inner holes (207), the inner part of the inner hole (207) is rotatably connected with the outer guide shaft (208), and the inner side of the rotating ring (206) is fixedly connected with the clamping ring (209). The stabilizing assembly (4) comprises a stabilizing ring (401), a limiting ring (402), a front hole (403), a rear pipe (404), an outer mounting seat (405), a winding shaft (406) and an outer fastening ring (407), the inner front side wall of the stabilizing ring (401) is fixedly connected with a plurality of limiting rings (402), the front side wall of the stabilizing ring (401) is provided with the front hole (403), the rear side wall of the stabilizing ring (401) is fixedly connected with the rear pipe (404), the rear side wall of the stabilizing ring (401) is fixedly connected with a plurality of outer mounting seats (405), the inner part of the outer mounting seat (405) is rotatably connected with the winding shaft (406), the left and right ends of the winding shaft (406) are threadedly connected with the outer fastening ring (407), and the outer fastening ring (407) is located on the outer side of the outer mounting seat (405). The inner parts of the rear segment assembly (5), the middle segment assembly (6) and the front segment assembly (9) are provided with steel wires (10), the front ends of the steel wires (10) pass through the limiting ring (402), bypass the outer guide shaft (208) and are fixed on the winding shaft (406).

2. The steerable catheter for use in an interventional procedure according to claim 1, characterized in that: The front of the large fastening ring (3) is threadedly connected with the front ring (204), and the rear of the large fastening ring (3) is threadedly connected with the rear pipe (404).

3. The steerable catheter for use in an interventional procedure according to claim 1, characterized in that: The rear segment assembly (5) comprises a rear segment outer tube (501), a rear segment inner tube (502), a rear segment support ring (503), a rear segment inner seat (504), a rear segment guide shaft (505) and a rear segment ball cover (506), the inner side of the rear segment outer tube (501) is provided with the rear segment inner tube (502), the rear segment outer tube (501) and the rear segment inner tube (502) are fixedly connected with the stabilizing ring (401), the rear segment outer tube (501) and the rear segment inner tube (502) are fixedly connected with the rear segment support ring (503), the circumferential surface of the rear segment inner tube (502) is fixedly connected with a plurality of rear segment inner seats (504), the inside of the rear segment inner seat (504) is rotatably connected with the rear segment guide shaft (505), and the front of the rear segment support ring (503) is fixedly connected with a plurality of rear segment ball covers (506).

4. The steerable catheter for use in an interventional procedure according to claim 3, characterized in that: The middle segment assembly (6) comprises a middle segment outer tube (601), a middle segment inner tube (602), a middle segment support ring (603), a middle segment inner seat (604), a middle segment guide shaft (605), a middle segment ball cover (606) and a middle segment ball rod (607), the inner side of the middle segment outer tube (601) is provided with the middle segment inner tube (602), the middle segment outer tube (601) and the middle segment inner tube (602) are fixedly connected with two middle segment support rings (603), the circumferential surface of the middle segment inner tube (602) is fixedly connected with a plurality of middle segment inner seats (604), the inside of the middle segment inner seat (604) is rotatably connected with the middle segment guide shaft (605), the front of the front middle segment support ring (603) is fixedly connected with a plurality of middle segment ball covers (606), and the rear of the rear middle segment support ring (603) is fixedly connected with a plurality of middle segment ball rods (607).

5. A steerable catheter for use in interventional therapy according to claim 4, characterized in that: The front segment assembly (9) comprises a front segment outer tube (901), a front segment inner tube (902), a front segment support ring (903), a front segment inner seat (904), a front segment guide shaft (905), a front segment ball rod (906) and a catheter head (907), the inner side of the front segment outer tube (901) is provided with the front segment inner tube (902), the front segment outer tube (901) and the front segment inner tube (902) are fixedly connected with the front segment support ring (903), the circumferential surface of the front segment inner tube (902) is fixedly connected with a plurality of front segment inner seats (904), the inside of the front segment inner seat (904) is rotatably connected with the front segment guide shaft (905), the rear of the rear front segment support ring (903) is fixedly connected with a plurality of front segment ball rods (906), and the front of the front front segment support ring (903) is fixedly connected with the catheter head (907).

6. A steerable catheter for use in interventional therapy according to claim 5, wherein: The connecting outer tube (7) is fixedly connected between the adjacent rear section outer tube (501), middle section outer tube (601) and front section outer tube (901), the connecting inner tube (8) is fixedly connected between the adjacent rear section inner tube (502), middle section inner tube (602) and front section inner tube (902), the rear section ball cover (506), middle section ball cover (606), middle section ball rod (607) and front section ball rod (906) are located between the connecting outer tube (7) and the connecting inner tube (8), the rear section ball cover (506) is forwardly and rearwardly clamped with the middle section ball rod (607), the middle section ball cover (606) and the middle section ball rod (607) in the adjacent middle section assembly (6) are forwardly and rearwardly clamped and matched, and the front section ball rod (906) is forwardly and rearwardly clamped with the middle section ball cover (606).

7. The steerable catheter for use in an interventional procedure according to claim 5, characterized in that: The connecting outer tube (7) and the connecting inner tube (8) are made of TPU material.

8. The steerable catheter for use in an interventional procedure according to claim 5, characterized in that: The front end and the frontmost end of the steel wire (10) are fixedly connected with the front section support ring (903), and are sequentially wound on the front section guide shaft (905), the middle section guide shaft (605) and the rear section guide shaft (505).

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