Handle of bending-adjustable micro catheter and bending-adjustable micro catheter

Abstract

The utility model discloses a bending-adjustable microcatheter handle and a bending-adjustable microcatheter, and belongs to the technical field of medical instruments, the bending-adjustable microcatheter handle comprises a traction wire and a Y-shaped seat, the Y-shaped seat comprises a main branch tube and a side branch tube intersecting with the axis of the main branch tube, one end of the traction wire sequentially penetrates through the main branch tube and is fixedly connected with the end part of the side branch tube, and the other end of the traction wire is fixedly connected with the handle. The other end is fixedly connected with a component connected with the far end of the main branch pipe; a rotating handle rotating cap and a push-pull device are arranged on a bottom pipe of a side branch pipe to be matched with a traction wire, so that the push-pull device moves back and forth in the axial direction of the bottom pipe, and then a fixing buckle connected with the traction wire in a push-pull shell is pushed backwards to complete the bending adjustment action of the traction wire. The utility model further discloses an adjustable bending micro catheter. The handle avoids the situations of wire clamping, wire winding and difficult straightening of the far-end adjustable bent pipe body, and has the advantages of being simple in structure, convenient and fast to operate, low in cost, easy to assemble and high in utilization rate.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a handle and an adjustable bendable microcatheter. Background Technology

[0002] Adjustable curved sheaths are commonly used to establish a channel between the lesion site inside the patient and the external operating point, allowing for the introduction or removal of diagnostic or therapeutic instruments, drugs, body fluids, thrombi, etc., thus avoiding the need for surgery. These distally pre-shaped interventional sheaths typically require the assistance of guidewires and dilators to accurately reach the lesion site. Clinically, sheaths are often used as a channel for endoscopic biopsies, bacteriological examinations, and cytological procedures to facilitate access to the lesion. Adjusting the sheath's position is extremely difficult and demands a high level of skill from the surgeon; even after adjustment, it is challenging to maintain the sheath stably in its current position.

[0003] Due to its flexibility, the guidewire can easily enter the lesion site and establish a delivery channel. A pre-shaped dilator is inserted into the lumen of the catheter. As the sheath and dilator advance along the guidewire and reach the lesion, they are guided towards the target position by the guidewire. However, most adjustable-bend catheters have a wide range of bending angles, while certain anatomical structures require fine-tuning at specific angles. Therefore, when operating such adjustable-bend sheaths, a certain amount of time is needed to adjust the distal bending angle to a specific angle, and the markings on the adjustable-bend sheath must be constantly monitored to check if the distal end has been adjusted to the specific angle. The operator cannot quickly and accurately achieve a specific bending angle at the distal end of the sheath, prolonging the operation time and increasing the surgical risk for the patient. Furthermore, existing coaxial catheter devices with straight handles suffer from interference from the rotating mechanism, leading to jamming and reduced operability, while angled handle devices have limited compatibility.

[0004] Existing technologies disclose several patents for adjustable sheaths. Among them, utility model patent CN105251094A discloses an adjustable sheath, comprising a tubular body, a traction wire, and a handle connected to the tubular body. The handle includes a side branch intersecting the axis of the tubular body. A slider that can translate along the side branch is provided within the side branch. One end of the traction wire is fixed to the slider, and the other end is fixed to the distal end of the tubular body. A positioning element is also provided within the side branch, located further away from the tubular body than the slider. When the slider moves to contact the positioning element, the distal end of the tubular body bends to a predetermined angle. Although this solves the problem of precise sheath position adjustment, it still suffers from complex structure, high cost, complex assembly, cumbersome operation, and issues such as wire jamming, wire winding, and difficulty in springback.

[0005] In view of this, the inventors conducted in-depth research to address this need, which led to this case. Utility Model Content

[0006] To overcome the problems of complex structure, high cost, complicated assembly, cumbersome operation, wire jamming, wire winding, and difficulty in springback that still exist in the existing technology, this utility model provides a handle for an adjustable bendable microcatheter and an adjustable bendable microcatheter.

[0007] A handle for an adjustable bendable microcatheter includes a traction wire and a Y-shaped seat. The Y-shaped seat includes a main branch tube and a side branch tube intersecting the axis of the main branch tube. One end of the traction wire passes through the ends of the main branch tube and the side branch tube in sequence and is fixedly connected. The other end is fixedly connected to a component connected to the distal end of the main branch tube.

[0008] The side branch pipe includes a bottom pipe, a rotating cap, and a push-pull device. The rotating cap is sleeved on the bottom pipe near the side of the main branch pipe. The push-pull device is sleeved on the free end of the bottom pipe. The traction wire is connected to the end of the push-pull device away from the rotating cap. The rotating cap is used to adjust the push-pull device to move back and forth along the axial direction of the bottom pipe.

[0009] A Y-shaped seat is adopted, and a rotating cap and a push-pull device are set on the bottom pipe of the side branch pipe in conjunction with the traction wire. By rotating the rotating cap on the bottom pipe, the push-pull device moves back and forth along the bottom pipe axis to complete the bending action of the far end of the traction wire. The bending wire inside the bottom pipe can be adjusted by simply rotating the rotating cap, so that its far end can be bent. The structure is simple and easy to operate. The push-pull device is an independent structure that does not interfere with the traction wire during movement, avoiding wire jamming and tangling, which would make it difficult to straighten the adjustable bending pipe.

[0010] Furthermore, the push-pull device includes a cylindrical push-pull shell, a push-pull spring, a fixing buckle, and a bottom cap. The push-pull spring and the push-pull shell are sequentially sleeved on the outside of the bottom tube and abut against the end of the rotating cap. The bottom cap is threadedly connected to the inside of the free end of the push-pull shell. The fixing buckle is snapped into the push-pull shell near the bottom cap. The traction wire is fixedly connected to the middle of the fixing buckle.

[0011] Through the above technical solution, the push-pull device uses a spring mechanism, which keeps it in an elastic state under any condition, thus better ensuring its stability, preventing the rotation of the fixing buckle, and avoiding wire tangling or jamming. Secondly, there is a compressive force during the backward rotation of the rotating cap, which pushes the fixing buckle to achieve the purpose of pushing it, allowing the user to better control the degree and distance of bending.

[0012] Furthermore, a pair of arc-shaped positioning grooves are symmetrically provided on the near-end outer wall of the bottom tube, and two arc-shaped protrusions are integrally provided symmetrically inward at the end of the push-pull shell opposite to the bottom cap, and the arc-shaped protrusions match the positioning grooves.

[0013] Through the above technical solution, a positioning groove is opened on the outer side of the end of the bottom tube. The arc-shaped boss set on the push-pull shell in conjunction with the positioning groove can facilitate the relative fixation of the push-pull shell and the bottom tube by rotating. The matching setting of the positioning groove and the arc-shaped boss can ensure that the push-pull device can move on the bottom tube. During the movement of the fixing buckle, it does not interfere with the traction wire, avoiding the situation of wire jamming, wire winding and difficulty in straightening the adjustable bend at the far end.

[0014] Furthermore, a pair of mounting grooves are provided at the free end edge of the positioning groove, and a pair of fan-shaped retaining rings are provided in the mounting grooves. The mounting grooves are engaged with the fan-shaped retaining rings, and the fan-shaped retaining rings abut against the push-pull spring. The gap formed between the installed fan-shaped retaining rings and the inner wall of the push-pull shell is matched. An installation window for installing the fan-shaped retaining rings is provided on the outer wall of the push-pull shell, and an arc-shaped side cover is provided on the installation window.

[0015] Through the above technical solution, a fan-shaped retaining ring is set in the positioning groove near the free end of the bottom tube so that it abuts against the push-pull spring, ensuring the force-bearing surface of the push-pull spring end. To facilitate the installation of the fan-shaped retaining ring, an installation window is set at the corresponding position of the push-pull shell. When in use, after the fan-shaped retaining ring is installed from the installation window, the arc-shaped side cover can be installed.

[0016] Furthermore, spring coils are fixedly connected to both ends of the push-pull spring. The outer diameter of the push-pull spring and the spring coils are both smaller than the inner diameter of the push-pull shell. The inner diameter of the push-pull spring and the spring coils are both larger than the maximum outer diameter of the bottom tube. The spring coils at both ends of the push-pull spring abut against the arc-shaped boss and the fan-shaped retaining ring, respectively.

[0017] By using the above technical solution, setting spring coils at both ends of the push-pull spring can increase the force-bearing area at both ends of the push-pull spring, and at the same time make the force on the push-pull spring more uniform. It can also facilitate fixed assembly. Setting the inner diameter of the push-pull spring to be slightly larger than the outer diameter of the bottom tube and slightly smaller than the inner diameter of the push-pull device can ensure that the spring coil can extend and retract freely.

[0018] Furthermore, the angle between the axis of the main branch pipe lumen and the axis of the side branch pipe lumen is an acute angle.

[0019] By using the above technical solution, the angle between the side branch pipe and the main branch pipe is set to an acute angle, which can reduce the pulling force of the traction wire, making pushing and pulling easier and operation more convenient.

[0020] Furthermore, the bottom pipe has several scale markings on its outer wall near the main branch pipe, and a rotating thread is formed on the outer wall of the bottom pipe near the scale markings. The rotating cap is threadedly connected to the bottom pipe, and the length of the rotating thread is less than the length of the rotating cap.

[0021] Through the above technical solution, a spiral marking line is set at the bottom of the side branch pipe near the edge of the main branch pipe, so that the backward movement distance of the rotating cap can be clearly seen, and the backward rotation distance of the rotating cap and the curvature of the far end of the handle can be adjusted.

[0022] Furthermore, the fixing buckle is hemispherical and has a fixing hole in the middle. The end of the push-pull shell opposite to the rotating cap is provided with a limit sill. The limit sill abuts against the arc-shaped surface of the fixing buckle, and the plane of the fixing buckle abuts against the bottom cap.

[0023] Through the above technical solution, the fixing buckle connecting the traction wire is a metal hemispherical design that abuts against the limiting step inside the push-pull shell. The flat surface of the fixing buckle provides a better fixing surface and is not easy to fall off after fixing. Even if the traction wire is rotated by external torque, the hemispherical structure can easily rotate with the wire to ensure that the wire does not deform and its rigidity is not damaged.

[0024] Furthermore, the proximal end of the main branch pipe is provided with a conical locking joint for adapting to other structures.

[0025] The above technical solution involves setting a locking connector at the proximal end of the main branch tube, which facilitates the assembly of the main branch tube with other instruments and increases the variety of instruments that can be adapted.

[0026] This utility model also provides an adjustable bendable microcatheter, including a handle as described above and a sheath body fixedly connected to the distal end of the main branch tube, wherein the traction wire is connected to the distal end of the sheath body.

[0027] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0028] (1) A Y-shaped seat is adopted. A rotating cap and a push-pull device are set on the bottom pipe of the side branch pipe in conjunction with the traction wire. By rotating the rotating cap on the bottom pipe, the push-pull device moves back and forth along the bottom pipe axis, thereby pushing the fixing buckle of the traction wire in the push-pull shell backward, completing the bending action of the far end of the traction wire. The bending wire inside the bottom pipe can be adjusted by simply rotating the rotating cap, so that the far end can be bent. The structure is simple and the operation is convenient.

[0029] (2) The push-pull device uses a spring mechanism, which keeps it in an elastic state under any conditions, thus better ensuring its stability. Secondly, there is a compressive force during the rotation of the rotating cap to achieve the purpose of rotating the fixed buckle, allowing the user to better control the degree and distance of the bend.

[0030] (3) A positioning groove is opened on the outside of the free end of the bottom tube. An arc-shaped boss is set on the push-pull shell in conjunction with the positioning groove to facilitate the relative fixation of the push-pull shell and the bottom tube by rotating. The matching of the positioning groove and the arc-shaped boss can ensure that the push-pull device can move on the bottom tube. During the movement of the fixing buckle, it does not interfere with the traction wire, avoiding the situation of wire jamming, wire winding and difficulty in straightening the adjustable bend at the far end. The device components can be made of high polymer material by injection molding, which is low in cost, easy to assemble and has a high utilization rate. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the handle of an adjustable bendable microcatheter according to this utility model;

[0033] Figure 2 This is a schematic diagram of the handle of an adjustable bendable microcatheter according to this utility model;

[0034] Figure 3 This is a schematic diagram of the push-pull spring installation of the handle of an adjustable bendable microcatheter according to this utility model;

[0035] Figure 4 This is a schematic diagram of the push-pull shell structure of the handle of an adjustable bendable microcatheter according to this utility model.

[0036] Figure 5 This is a schematic diagram of the fixing buckle structure of the handle of an adjustable bendable microcatheter according to this utility model;

[0037] Figure 6 This is a top view of the push-pull shell of the handle of an adjustable bendable microcatheter according to this utility model;

[0038] Figure 7 This is a schematic diagram of the fan-shaped retaining ring structure of the handle of an adjustable bendable microcatheter according to this utility model.

[0039] Figure 8 This is a schematic diagram of the structure of an adjustable bendable microcatheter according to this utility model;

[0040] In the diagram, 1. Traction wire; 2. Y-shaped seat; 3. Main branch pipe; 4. Side branch pipe; 5. Bottom pipe; 6. Rotating cap; 7. Push-pull device; 8. Push-pull shell; 9. Push-pull spring; 10. Fixing buckle; 11. Bottom cap; 12. Positioning groove; 13. Mounting groove; 14. Arc-shaped boss; 15. Fan-shaped retaining ring; 16. Mounting window; 17. Arc-shaped side cover; 18. Spring ring; 19. Scale marking line; 20. Rotary thread; 21. Fixing hole; 22. Limiting stop; 23. Locking joint; 24. Sheath tube body. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0042] This embodiment uses a Y-shaped seat. A rotating cap and a push-pull device are installed on the bottom tube of the side branch pipe in conjunction with a traction wire. The rotation of the rotating cap on the bottom tube causes the push-pull device to move back and forth along the axial direction of the bottom tube. This pushes the fixing buckle of the traction wire inside the push-pull housing backward, completing the bending action at the distal end of the traction wire. The bending wire inside the bottom tube can be adjusted simply by rotating the rotating cap, making its distal end bendable. The structure is simple and the operation is convenient. Specific implementation details are as follows:

[0043] like Figure 1-7 As shown, a handle for an adjustable bendable microcatheter includes a traction wire 1 and a Y-shaped seat 2. The Y-shaped seat 2 includes a main branch tube 3 and a side branch tube 4 intersecting the axis of the main branch tube 3. One end of the traction wire 1 passes through the ends of the main branch tube 3 and the side branch tube 4 in sequence and is fixedly connected. The other end is fixedly connected to a component connected to the distal end of the main branch tube 3.

[0044] The side branch pipe 4 includes a bottom pipe 5, a rotating cap 6, and a push-pull device 7. The rotating cap 6 is sleeved on the bottom pipe 5 on the side close to the main branch pipe 3. The push-pull device 7 is sleeved on the free end of the bottom pipe 5. The traction wire 1 is connected to the end of the push-pull device 7 away from the rotating cap 6. The rotating cap 6 is used to adjust the push-pull device 7 to move back and forth along the pipe axis of the bottom pipe 5.

[0045] Here, a Y-shaped seat 2 is used, and a rotating cap 6 and a push-pull device 7 are set on the bottom pipe 5 of the side branch pipe 4 in conjunction with the traction wire 1. By rotating the rotating cap 6 on the bottom pipe 5, the push-pull device 7 moves back and forth along the pipe axis of the bottom pipe 5 to complete the bending action of the far end of the traction wire 1. The bending wire inside the bottom pipe 5 can be adjusted by simply rotating the rotating cap 6, so that its far end can be bent. The structure is simple and the operation is convenient. The push-pull device 7 is an independent structure and does not interfere with the traction wire 1 during the movement, avoiding the situation of wire jamming and wire tangling, which makes it difficult for the adjustable bending pipe to straighten.

[0046] In a preferred embodiment, the push-pull device 7 includes a cylindrical push-pull shell 8, a push-pull spring 9, a fixing buckle 10, and a bottom cap 11. The push-pull spring 9 and the push-pull shell 8 are sequentially sleeved on the outside of the bottom tube 5 and abut against the end of the rotating cap 6. The bottom cap 11 is threadedly connected to the inside of the free end of the push-pull shell 8. The fixing buckle 10 is snapped into the push-pull shell 8 at one end near the bottom cap 11. The traction wire 1 is fixedly connected to the middle of the fixing buckle 10.

[0047] Here, the push-pull device 7 uses a spring mechanism, which keeps it in an elastic state under any conditions, thus better ensuring its stability. Secondly, there is a compressive force during the backward rotation of the rotating cap 6, which achieves the purpose of moving the fixed buckle 10, allowing the user to better control the degree and distance of the adjustment.

[0048] In a preferred embodiment, a pair of arc-shaped positioning grooves 12 are symmetrically provided on the near-end outer wall of the bottom tube 5, and two arc-shaped protrusions 14 are integrally provided symmetrically inward at the end of the push-pull shell 8 away from the bottom cap 11, and the two arc-shaped protrusions 14 match the positioning grooves 12.

[0049] Here, a positioning groove 12 is provided on the outer side of the end of the bottom tube 5. An arc-shaped boss 14 is provided on the push-pull shell 8 in conjunction with the positioning groove 12. This facilitates the relative fixation of the push-pull shell 8 and the bottom tube 5 by rotating the push-pull shell 8. The matching arrangement of the positioning groove 12 and the arc-shaped boss 14 ensures that the push-pull device 7 can move on the bottom tube 5. During the movement of the fixing buckle 10, it does not interfere with the traction wire 1, thus avoiding the problems of wire jamming, wire winding, and difficulty in straightening the adjustable bend at the far end.

[0050] In a preferred embodiment, a pair of mounting grooves 13 are provided at the free end edge of the positioning groove 12. A pair of sector-shaped retaining rings 15 are provided in the mounting grooves 13. The mounting grooves 13 and the sector-shaped retaining rings 15 are engaged. The sector-shaped retaining rings 15 abut against the push-pull spring 9. The gap formed between the installed sector-shaped retaining rings 15 and the inner wall of the push-pull shell 8 is matched. An installation window 16 for installing the sector-shaped retaining rings 15 is provided on the outer wall of the push-pull shell 8. An arc-shaped side cover 17 is provided on the installation window 16.

[0051] Here, the spring coil 18 has a tightly wound structure at both ends. A fan-shaped retaining ring 15 is set in the positioning groove 12 near the free end of the bottom tube 5 so that it abuts against the push-pull spring 9, ensuring the force-bearing surface at the end of the push-pull spring 9. To facilitate the installation of the fan-shaped retaining ring 15, an installation window 16 is set at the corresponding position of the push-pull shell 8. When in use, after the fan-shaped retaining ring 15 is installed from the installation window 16, the arc-shaped side cover 17 is installed. The side cover is assembled on the push-pull shell 8 to form a sealed body.

[0052] In a preferred embodiment, spring coils 18 are fixedly connected to both ends of the push-pull spring 9. The outer diameter of the push-pull spring 9 and the spring coils 18 are both smaller than the inner diameter of the push-pull shell 8, and the inner diameter of the push-pull spring 9 and the spring coils 18 are both larger than the maximum outer diameter of the bottom tube 5. The spring coils 18 at both ends of the push-pull spring 9 abut against the arc-shaped boss 14 and the fan-shaped retaining ring 15, respectively.

[0053] Here, the spring coil 18 is made of shape memory steel. Setting the spring coil 18 at both ends of the push-pull spring 9 can increase the force-bearing area at both ends of the push-pull spring 9, and at the same time make the force on the push-pull spring 9 more uniform. It can also be convenient to fix and assemble simply. The setting of the inner diameter of the push-pull spring 9 being slightly larger than the outer diameter of the bottom tube 5 and slightly smaller than the inner diameter of the push-pull device 7 can ensure that the spring coil 18 can extend and retract freely.

[0054] In a preferred embodiment, the angle between the axis of the lumen of the main branch pipe 3 and the axis of the lumen of the side branch pipe 4 is an acute angle.

[0055] Here, setting the angle between the side branch pipe 4 and the main branch pipe 3 to an acute angle can reduce the pulling force of the traction wire 1, making pushing and pulling easier and operation more convenient.

[0056] In a preferred embodiment, the bottom pipe 5 has several scale marking lines 19 on its outer wall near the main branch pipe 3, and a rotating thread 20 is provided on the outer wall of the bottom pipe 5 near the scale marking lines 19. The rotating cap 6 is threadedly connected to the bottom pipe 5, and the length of the rotating thread 20 is less than the length of the rotating cap 6.

[0057] Here, a scale marking line 19 is set outward from the bottom of the side branch pipe 4 near the edge of the main branch pipe. The scale marking line 19 can be a spiral marking line, so that the backward distance of the rotating cap 6 can be clearly seen, and the backward rotation distance of the rotating cap 6 and the curvature of the far end of the handle can be adjusted.

[0058] In a preferred embodiment, the fixing buckle 10 is hemispherical and has a fixing hole 21 in the middle. The end of the push-pull shell 8 away from the rotating cap 6 is provided with a limiting step 22. The limiting step 22 abuts against the arc surface of the fixing buckle 10, and the plane of the fixing buckle 10 abuts against the bottom cap 11.

[0059] Here, the fixing buckle 10 connecting the traction wire is a metal hemispherical design and abuts against the limiting step 22 inside the push-pull shell 8. The flat surface of the fixing buckle 10 provides a better fixing surface and is not easy to fall off after fixing. Even if the traction wire 1 is rotated by external torque, the hemispherical structure can easily rotate with the wire to ensure that the wire is not deformed and its rigidity is not damaged. In addition, the traction wire 1 and the fixing hole 21 can be fixed inside the fixing hole 21 by welding, or the traction wire 1 can be fixed inside the fixing hole 21 by using a fixing pin.

[0060] As a preferred embodiment, the proximal end of the main branch pipe 3 is provided with a conical locking joint 23 for adapting to other structures.

[0061] Here, a locking connector 23 is provided at the proximal end of the main branch tube 3, and the top end of the main branch tube 3 is an inner conical locking connector, which facilitates the assembly of the main branch tube 3 with other instruments and increases the types of instruments that can be adapted.

[0062] Reference Figure 8 As shown, this embodiment also provides an adjustable microcatheter, including a handle as described above and a sheath body 24 fixedly connected to the distal end of the main branch tube 3. The traction wire 1 is connected to the distal end of the sheath body 24. The rotation of the rotating cap on the bottom tube causes the push-pull device to move back and forth along the bottom tube axis, thereby pushing the fixing buckle of the traction wire inside the push-pull shell backward, completing the adjustment of the distal end of the sheath body 24. The adjustment of the sheath body 24 can be completed simply by rotating the rotating cap, making the structure simple and convenient to operate. It is understood that the handle described above can also be used for adjusting the embolization protection device.

[0063] Here, all components on the main branch pipe 3 and the side branch pipe 4, except for the push-pull spring 9, can be made of polymer materials by injection molding. In addition, an injection hole is provided in the middle of the outer side of the main branch pipe 3. The diameter of the injection hole decreases from the outside to the inside, which facilitates the injection of adhesive when other instruments are connected to the outside of the main branch pipe 3.

[0064] The term "proximal end" usually refers to the end of the corresponding component that is closer to the operator, while "distal end" refers to the end of the corresponding component that is farther away from the operator.

[0065] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handle for an adjustable bendable microcatheter, characterized in that, It includes a traction wire (1) and a Y-shaped seat (2). The Y-shaped seat (2) includes a main branch pipe (3) and a side branch pipe (4) intersecting the axis of the main branch pipe (3). One end of the traction wire (1) passes through the main branch pipe (3) and is fixedly connected to the end of the side branch pipe (4). The other end is fixedly connected to a component connected to the far end of the main branch pipe (3). The side branch pipe (4) includes a bottom pipe (5), a rotating cap (6), and a push-pull device (7). The rotating cap (6) is sleeved on the bottom pipe (5) on the side close to the main branch pipe (3). The push-pull device (7) is sleeved on the free end of the bottom pipe (5). The traction wire (1) is connected to the end of the push-pull device (7) away from the rotating cap (6). The rotating cap (6) is used to adjust the push-pull device (7) to move back and forth along the pipe axis of the bottom pipe (5).

2. The handle of an adjustable bendable microcatheter according to claim 1, characterized in that, The push-pull device (7) includes a cylindrical push-pull shell (8), a push-pull spring (9), a fixing buckle (10), and a bottom cap (11). The push-pull spring (9) and the push-pull shell (8) are sequentially sleeved on the outside of the bottom tube (5) and abut against the end of the rotating cap (6). The bottom cap (11) is threaded to the inside of the free end of the push-pull shell (8). The fixing buckle (10) is snapped into the push-pull shell (8) at one end near the bottom cap (11). The traction wire (1) is fixedly connected to the middle of the fixing buckle (10).

3. The handle of an adjustable bendable microcatheter according to claim 2, characterized in that, A pair of arc-shaped positioning grooves (12) are symmetrically provided on the near-end outer wall of the bottom tube (5). Two arc-shaped bosses (14) are integrally provided symmetrically inward at the end of the push-pull shell (8) away from the bottom cap (11). The arc-shaped bosses (14) match the positioning grooves (12).

4. The handle of an adjustable bendable microcatheter according to claim 3, characterized in that, A pair of mounting grooves (13) are provided at the end edge of the positioning groove (12). A pair of fan-shaped retaining rings (15) are provided in the mounting grooves (13). The mounting grooves (13) are engaged with the fan-shaped retaining rings (15). The fan-shaped retaining rings (15) abut against the push-pull spring (9). The gap formed between the installed fan-shaped retaining rings (15) and the inner wall of the push-pull shell (8) is matched. An installation window (16) for installing the fan-shaped retaining rings (15) is provided on the outer wall of the push-pull shell (8). An arc-shaped side cover (17) is provided on the installation window (16).

5. The handle of an adjustable bendable microcatheter according to claim 4, characterized in that, Both ends of the push-pull spring (9) are fixedly connected with spring coils (18). The outer diameter of the push-pull spring (9) and the spring coils (18) are smaller than the inner diameter of the push-pull shell (8). The inner diameter of the push-pull spring (9) and the spring coils (18) are larger than the maximum outer diameter of the bottom tube (5). The spring coils (18) at both ends of the push-pull spring (9) abut against the arc-shaped boss (14) and the fan-shaped retaining ring (15), respectively.

6. The handle of an adjustable bendable microcatheter according to claim 3, characterized in that, The angle between the axis of the main branch pipe (3) and the axis of the side branch pipe (4) is an acute angle.

7. The handle of an adjustable bendable microcatheter according to claim 1, characterized in that, The bottom pipe (5) has several scale marking lines (19) on its outer wall near the main branch pipe (3). A rotating thread (20) is provided on the outer wall of the bottom pipe (5) near the scale marking lines (19). The rotating cap (6) is threadedly connected to the bottom pipe (5). The length of the rotating thread (20) is less than the length of the rotating cap (6).

8. The handle of an adjustable bendable microcatheter according to claim 3, characterized in that, The fixing buckle (10) is hemispherical and has a fixing hole (21) in the middle. The push-pull shell (8) has a limit stop (22) at the end away from the rotating cap (6). The limit stop (22) abuts against the arc surface of the fixing buckle (10), and the plane of the fixing buckle (10) abuts against the bottom cap (11).

9. The handle of an adjustable bendable microcatheter according to claim 1, characterized in that, The proximal end of the main branch pipe (3) is provided with a conical locking joint (23) for adapting to other structures.

10. An adjustable-bend microcatheter, characterized in that, Includes a handle as described in any one of claims 1-9 and a sheath tube body (24) fixedly connected to the distal end of the main branch tube (3), wherein the traction wire (1) is connected to the distal end of the sheath tube body (24).

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