Controllable bending conduit and its control handle

Abstract

This invention discloses a controllable bending catheter and its control handle. The controllable bending catheter has a guidewire in its lumen and a pair of draw wire cavities parallel to the axial direction in its wall thickness. Each of the draw wire cavities contains a traction wire. The distal end of the controllable bending catheter is flexible, and the pair of traction wires have different lengths. The control handle has, from far to near, an end cap, an end cap, a knob tube, a handle cap, a handle cap, and a hemostatic valve. Internally, it contains a core rod and a wire-connecting screw. In this invention, the control handle uses a single-threaded screw, and the pair of traction wires in the controllable bending catheter have different lengths, realizing bidirectional controllable bending of the catheter. Compared with the existing bidirectional controllable bending catheter control handles that use positive and negative double-threaded screws, it has fewer components, lower manufacturing costs, smoother transmission, less effort in bending control, and is easier to produce and assemble.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a controllable bending catheter and its control handle. Background Technology

[0002] Catheters are indispensable tools in surgeries involving bifurcated vessels and requiring precise localization, such as septal puncture, cardiovascular intervention, peripheral vascular intervention, and other intraluminal or minimally invasive procedures, atrial septal puncture, renal artery ablation, heart valve repair, and tumor embolization. Pre-shaped catheters are typically used to establish an external pathway to the target location, providing a route for subsequent guidewires or other instruments to enter for diagnosis and treatment. However, due to individual differences in human anatomy, pre-shaped catheters cannot perfectly adapt to all clinical needs. If an inserted catheter does not fit the patient's physiological structure, it must be withdrawn and a new catheter inserted, increasing surgical time and potentially causing harm to the patient.

[0003] To accommodate individual differences in human anatomy and physiology, controllable bending catheters have been developed and widely used. A controllable bending catheter features a controllable bend at the distal end of the catheter body. By manipulating the catheter handle, a traction wire connected to the controllable bend moves axially, causing the distal end of the catheter to bend at different angles. When the bend angle conforms to the specific physiological characteristics of the human lumen, the handle is stopped, and the distal end of the catheter is aligned with the target lumen inlet. Diagnostic and / or therapeutic instruments are then delivered into the target lumen through the catheter.

[0004] Currently, controllable bending catheters are classified into unidirectional, bidirectional, tridirectional, and quadridirectional controllable bending catheters according to the number of internal traction wires, with bidirectional controllable bending catheters being the most widely used in production. Taking existing patents such as CN202011195322.8 and CN202022669517.3 as examples, the control handle of the existing bidirectional controllable bending catheter achieves bidirectional controllable bending of the catheter through a rotating device containing a double-threaded screw. The unidirectional rotation of the double-threaded screw drives the moving part connected to the traction wire to move in the opposite direction, causing a difference in the length of the pair of traction wires remaining in the middle of the catheter wall thickness. The flexible distal end of the catheter bends towards the side of the traction wire with the shorter length remaining in the middle of the catheter wall thickness. The pair of traction wires are symmetrically arranged about the central axis of the catheter and usually have the same length. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a controllable bending conduit and its control handle. The control handle adopts a single threaded screw and a pair of traction wires in the controllable bending conduit have different lengths. Combined with a simple and ingenious bending control structure design, the conduit achieves bidirectional controllable bending, which has the advantages of smoother transmission, more labor-saving bending control, easy production and assembly, reduced manufacturing costs, low failure rate, and strong stability.

[0006] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: a controllable bending conduit, wherein a guide wire is provided in the lumen of the controllable bending conduit and a pair of drawing cavities are provided parallel to the axial direction in the wall thickness, the pair of drawing cavities are symmetrical about the central axis of the controllable bending conduit and each contains a traction wire, the distal end of the controllable bending conduit is flexible and a wire-connecting ring is fixed in the wall thickness, the distal end of the traction wire is connected to the fixed wire-connecting ring, and the proximal end penetrates the outer wall of the controllable bending conduit, and the pair of traction wires have different lengths.

[0007] Preferably, the controllable bending conduit is provided with a polymer inner layer, a metal reinforcing layer and a polymer inner layer from the inside out.

[0008] Preferably, the pair of drawing cavities are located between the polymer inner layer and the metal reinforcing layer.

[0009] Preferably, the metal reinforcing layer is composed of alloy wire spring coils and / or alloy wire braided tubes.

[0010] Based on the control handle of the aforementioned controllable bending conduit:

[0011] The control handle has, from far to near, an upper end cover, a lower end cover, a knob tube, a handle upper cover, a handle lower cover, and a hemostatic valve. Internally, it contains a core rod and a connecting screw. The upper and lower end covers, and the upper and lower handle covers, are fixed together by interlocking clips, with both ends open. The proximal ends of the upper and lower end covers are interlocked and axially limited within the knob tube. The distal ends of the upper and lower handle covers are interlocked and axially limited within the knob tube. The core rod has, from far to near, a stress end, a distal limiting block, a slide rail, a proximal limiting block, and a rod. The seat has an internal axial through-hole. The screw rod has a screw portion at its distal end and a wire-connecting portion at its proximal end. The stress end is a hollow frustum shape with an extended end cap and a lower end cap. The inner hole of the screw rod and the outer edge of the slide rail rod are both regular polygonal cross-sections. The outer wall of the slide rail rod has a pair of internal wire-leading holes, which are symmetrical about the central axis of the slide rail rod. The screw rod fits perfectly into the slide rail rod, limiting its circumferential movement and allowing it to slide axially. The outer wall of the screw portion has threads. The distal end of the wire-connecting portion has a distal limiting ring. The middle outer wall has... It has an external lead wire hole and a proximal limiting ring. Both the distal limiting ring and the proximal limiting ring protrude from the outer wall of the screw. The distal end of the proximal limiting block protrudes from the outer wall of the slide rail, and a wire guide post and a protective wall are provided at the inner lead wire hole on the corresponding side of the proximal outer wall. The protective wall is semi-cylindrical and its opening faces the distal end of the proximal limiting block. The wire guide post and the protective wall are coaxial, and their central axis is perpendicular to the central axis of the slide rail. The inner walls of the upper and lower handle covers are provided with sealing plates. The end of the wire guide post is fixed in the sealing plate with a clip, and the protective wall abuts against the sealing plate. The proximal limiting ring... A pair of first wire-connecting holes are provided at the corresponding pair of inner wire-connecting holes. A second wire-connecting hole is provided at the first wire-connecting hole on the same side of the proximal limiting ring adjacent to the sealing plate. The inner wall of the knob tube is provided with threads that are precisely engaged with the screw part. The inner walls of the end cap and the end cap are provided with distal retaining rings. The inner walls of the handle cap and the handle cap are provided with proximal retaining rings. The distal limiting block is fixed in the distal retaining ring for circumferential limiting. The rod seat is fixed in the proximal retaining ring for circumferential limiting. The distal retaining ring of the hemostatic valve is fixed in the opening of the handle cap and the handle cap and seals the opening of the rod seat.

[0012] The controllable curved catheter passes through the hemostatic valve and the core rod in sequence. A pair of traction wires pass through the inner guide wire hole, the outer guide wire hole and the first wire connection hole in sequence. The traction wire with a larger length passes around the wire guide column and connects to and fixes the second wire connection hole, while the traction wire with a smaller length directly connects to and fixes the first wire connection hole.

[0013] Preferably, the hemostatic valve has a first rubber plug and a second rubber plug sealed in the proximal opening from far to near. The first rubber plug has a round hole in the middle, and the second rubber plug has a cross-shaped incision in the middle. The controllable curved catheter passes through the cross-shaped incision and the round hole in sequence.

[0014] Preferably, the slide rail is provided with several glue injection holes, and the core rod is glued and fixed to the controllable bending guide tube.

[0015] Preferably, when the proximal limiting ring abuts against the proximal limiting block, the distal end of the screw portion abuts against the proximal opening of the knob tube, and when the distal limiting ring abuts against the proximal opening of the knob tube, the distal end of the screw portion abuts against the distal limiting block.

[0016] Preferably, when a certain part of the screw section is located near the opening of the knob tube, the portions of the two traction wires remaining in the drawing chamber have the same length.

[0017] Preferably, the end cap and end cap, and the handle cap and handle cap are glued together when they are fastened together.

[0018] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] In this invention, the control handle uses a single-threaded screw and the pair of traction wires in the controllable bending conduit have different lengths, realizing bidirectional controllable bending of the conduit. The control handle has a simple and ingenious structural design, with well-designed and precisely matched internal components. A stable and sufficient limiting mechanism ensures smooth and accurate bending transmission. Compared with the existing bidirectional controllable bending conduit control handle that uses positive and negative double-threaded screws, it has fewer components, lower manufacturing cost, smoother transmission, less effort required for bending, and is easier to produce and assemble. Attached Figure Description

[0020] Figure 1 This is a perspective view of an embodiment of the controllable bending conduit and its control handle proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the structure of the controllable bending conduit, traction wire, and guide wire in one embodiment of the controllable bending conduit and its control handle proposed in the invention.

[0022] Figure 3 This is a schematic diagram of the structure of the controllable bending conduit and its control handle in one embodiment of the invention, including the controllable bending conduit, traction wire, guide wire, and pull ring.

[0023] Figure 4 This is a schematic diagram of the structure of the polymer outer layer, the metal reinforcing layer, and the polymer inner layer in one embodiment of the controllable bending conduit and its control handle proposed in the invention.

[0024] Figure 5 This is a perspective view of an embodiment of the controllable bending conduit and its control handle proposed in this invention, after removing the end cap and the handle cap.

[0025] Figure 6 This is an exploded view of an embodiment of the controllable bending conduit and its control handle proposed in this invention.

[0026] Figure 7 This is a perspective view of the core rod in one embodiment of the controllable bending conduit and its control handle proposed in this invention.

[0027] In the diagram: 1. Controllable bending catheter; 2. Guidewire; 3. Pulling chamber; 4. Traction wire; 5. Connecting ring; 6. Polymer inner layer; 7. Metal reinforcing layer; 8. Polymer outer layer; 9. Alloy wire spring coil; 10. Alloy wire braided tubing; 11. Control handle; 12. End cap; 13. End cap; 14. Knob tube; 15. Handle cap; 16. Handle cap; 17. Hemostatic valve; 18. Core rod; 19. Connecting screw; 20. Stress end; 21. Distal limiting block; 22. Slide rail. ; 23. Proximal limiting block; 24. Rod seat; 25. Screw part; 26. Wire connecting part; 27. Inner wire lead hole; 28. Distal limiting ring; 29. ​​Outer wire lead hole; 30. Proximal limiting ring; 31. Wire guide post; 32. Protective wall; 33. Sealing plate; 34. First wire connecting hole; 35. Second wire connecting hole; 36. Distal retaining ring; 37. Proximal retaining ring; 38. First rubber plug; 39. Second rubber plug; 40. Round hole; 41. Cross cut; 42. Glue injection hole; 43. Friction texture. Detailed Implementation

[0028] The following detailed description of the invention, in conjunction with specific embodiments, further illustrates the invention (in the field of medical devices, "distal" refers to the end of the medical device controlled by the surgeon or located outside the human body, while "proximal" refers to the other end of the medical device that performs diagnostic / therapeutic functions or is located inside the human body; this definition extends to the distal and proximal directions, and the distal and proximal ends of individual components are named accordingly for ease of detailed explanation):

[0029] Combination Figures 1 to 7 This embodiment features a controllable bending catheter and a control handle that work together for interventional procedures, such as interventional embolization procedures, wherein:

[0030] A controllable bendable conduit 1 has a guide wire 2 in its lumen and a pair of wire-drawing cavities 3 parallel to the axial direction in its wall thickness. The pair of wire-drawing cavities 3 are symmetrical about the central axis of the controllable bendable conduit 1 and each has a traction wire 4 inside. The distal end of the controllable bendable conduit 1 is flexible and has a wire-connecting ring 5 fixed in its wall thickness. The distal end of the traction wire 4 is connected to the fixed wire-connecting ring 5, and the proximal end penetrates the outer wall of the controllable bendable conduit 1. The pair of traction wires 4 have different lengths. The controllable bendable conduit 1 has a polymer inner layer 6, a metal reinforcing layer 7 and a polymer inner layer 6 from the inside out. The pair of wire-drawing cavities 3 are located between the polymer inner layer 6 and the metal reinforcing layer 7.

[0031] The control handle 11 has, from far to near, an upper end cover 12, a lower end cover 13, a knob tube 14, a handle upper cover 15, a handle lower cover 16, and a hemostatic valve 17. Internally, it has a core rod 18 and a connecting screw 19. The upper end cover 12 and the lower end cover 13, as well as the upper handle cover 15 and the lower handle cover 16, are fixed together by interlocking clips, with open ends. The proximal ends of the upper end cover 12 and the lower end cover 13 are interlocked and fixed to the central axis of the knob tube 14, while the distal ends of the upper handle cover 15 and the lower handle cover 16 are interlocked and fixed to the central axis of the knob tube 14. The knob tube 14 has a ring-shaped protrusion in the middle and friction texture 43 on its outer wall, which is parallel to its central axis. The core rod 18 has a strip-shaped protrusion, and from far to near, it is provided with a stress end 20, a far-end limiting block 21, a slide rail 22, a near-end limiting block 23, and a rod seat 24. An axially penetrating opening is present inside. The threaded screw 19 has a screw part 25 at its far end and a threaded part 26 at its near end, with an axially penetrating opening inside. The stress end 20 is a hollow frustum shape and extends beyond the end cap 12 and end cap 13. The inner hole of the threaded screw 19 and the outer cross-section of the slide rail 22 are both regular hexagonal. The outer wall of the slide rail 22 has a pair of inner thread-leading holes 27 and several glue injection holes 42. The pair of inner thread-leading holes 27 are symmetrical about the central axis of the slide rail 22. The threaded screw 19 fits perfectly into the slide rail 22, limiting its circumferential movement and allowing it to slide axially. The screw part 25... The screw rod 25 has a threaded wall. The screw section 26 has a distal limiting ring 28 at its distal end, an external threading hole 29 on its middle outer wall, and a proximal limiting ring 30 at its proximal end. Both the distal limiting ring 28 and the proximal limiting ring 30 protrude from the outer wall of the screw section 25. The proximal limiting block 23 protrudes from the outer wall of the slide rail 22 at its distal end, and a threading post 31 and a protective wall 32 are located at the corresponding inner threading hole 27 on one side of the proximal outer wall. The protective wall 32 is semi-cylindrical with its opening facing the distal end of the proximal limiting block 23. The threading post 31 and the protective wall 32 are coaxial, and their central axis is perpendicular to the central axis of the slide rail 22. The upper cover 15 and the lower cover 16 of the handle have sealing plates 33 on their inner walls. The end of the threading post 31 is fixed in the sealing plate 33, and the protective wall 32... The sealing plate 33 is abutted, and a pair of first wire connecting holes 34 are provided on the proximal limiting ring plate 30 corresponding to a pair of inner wire connecting holes 27. A second wire connecting hole 35 is provided on the proximal limiting ring plate 30 adjacent to the first wire connecting hole 34 on the same side as the sealing plate 33. The inner wall of the knob tube 14 is provided with threads that are just screwed into the screw part 25. The inner walls of the end cap 12 and the end cap 13 are provided with distal retaining rings 36. The inner walls of the handle cap 15 and the handle cap 16 are provided with proximal retaining rings 37. The distal limiting block 21 is inserted and fixed in the circumferential limiting of the distal retaining ring 36. The rod seat 24 is inserted and fixed in the circumferential limiting of the proximal retaining ring 37. The distal insert of the hemostatic valve 17 is fixed in the opening of the handle cap 15 and the handle cap 16 and seals the opening of the rod seat 24.

[0032] The controllable bendable catheter 1 passes through the hemostatic valve 17 and the core rod 18 in sequence. A pair of traction wires 4 pass through the inner guide wire hole 27, the outer guide wire hole 29 and the first wire connection hole 34 in sequence. The traction wire 4 with a longer length passes around the wire guide column 31 and is connected and fixed to the second wire connection hole 35. The traction wire 4 with a shorter length is directly connected and fixed to the first wire connection hole 34. The proximal opening of the hemostatic valve 17 is sealed with a first rubber plug 38 and a second rubber plug 39 in sequence from far to near. The first rubber plug 38 has a round hole 40 in the middle. The second rubber plug 39 has a cross incision 41 in the middle. The controllable bendable catheter 1 passes through the cross incision 41 and the round hole 40 in sequence.

[0033] In the above embodiments and other embodiments of the present invention:

[0034] The metal reinforcing layer 7 is composed of alloy wire spring coils 9 and / or alloy wire braided tubes 10, such as Figure 4 The metal reinforcing layer 7 can be a single-layer alloy wire braided tube 10 (a), a single-layer alloy wire spring coil 9 (b), a single-layer structure formed by splicing alloy wire braided tube 10 with alloy wire spring coil 9 (c), a two-layer structure formed by inner and outer bonding of single-layer alloy wire braided tube 10 and single-layer alloy wire spring coil 9 (d), or a multi-layer structure formed by arbitrarily combining the four cases a, b, c and d.

[0035] The core rod 18 is glued to the controllable curved catheter 1 through the glue injection hole 42 to prevent the controllable curved catheter 1 from detaching from the core rod 18 during operation and affecting the surgery. When the end cap 12 and end cap 13, and the handle cap 15 and handle cap 16 are inserted and closed in pairs, they are glued and reinforced to make the outer shell structure of the control handle 11 more reliable.

[0036] The traction wire 4 is one of the alloy wires such as tungsten wire, nickel-titanium wire or stainless steel wire, which has excellent strength and toughness;

[0037] When a certain part of the screw section 25 is located near the opening of the knob tube 14, the portion of the pair of traction wires 4 remaining in the drawing chamber 3 has the same length. At this time, the distal end of the guide tube does not bend. When the knob tube 14 is rotated, causing the screw section 25 to move towards the distal end of the core rod 18, the proximal limiting ring 30 causes the distal ends of the pair of traction wires 4 to move synchronously towards the distal end of the core rod 18. This causes the portion of the traction wire 4 with the longer total length and the proximal end connected to and fixed to the second wire connection hole 35 to become longer, while the other portion becomes shorter. Therefore, the length of this traction wire 4 remaining in the drawing chamber 3 is shorter than the length of the traction wire 4 with the shorter total length and the proximal end connected to and fixed to the first wire connection hole 34. This causes the distal end of the flexible, controllable bending guide tube 1 to bend towards the side with the longer total length of the traction wire 4. When the knob tube 14 is rotated, causing the distal end of the screw section 25 to move towards the proximal end of the core rod 18, the proximal end... The limiting ring 30 drives the distal ends of a pair of traction wires 4 to move synchronously towards the proximal end of the core rod 18. This causes the portion of the traction wire 4 with a longer total length and a proximal end connected to and fixed to the second wire connection hole 35 that passes through the first wire connection hole 34 and around the wire guide post 31 to connect and fix the second wire connection hole 35 to become shorter, while the length of the other portion becomes longer. Therefore, the length of this traction wire 4 remaining in the drawing cavity 3 is greater than that of the traction wire 4 with a shorter total length and a proximal end connected to and fixed to the first wire connection hole 34. This results in the distal end of the flexible, controllable bending conduit 1 bending towards the side with the shorter total length of the traction wire 4, achieving controllable bidirectional bending of the conduit. Specifically, when the proximal limiting ring 30 abuts against the proximal limiting block 23, the distal end of the screw portion 25 abuts against the proximal opening of the knob tube 14. When the distal limiting ring 28 abuts against the proximal opening of the knob tube 14, the distal end of the screw portion 25 abuts against the distal limiting block 21, limiting the stroke length of the proximal limiting ring 30 to the length of the screw portion 25. Furthermore... In the actual design and production of this invention, the desired bidirectional bending angle and shape can be obtained by adjusting factors such as the length of a pair of traction wires 4 and the stroke length of the proximal limiting ring 30 according to the requirements of actual applications.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A control handle, characterized in that, include: The control handle (11) is provided with an upper end cover (12), a lower end cover (13), a knob tube (14), a handle upper cover (15), a handle lower cover (16), and a hemostatic valve (17) in sequence from far to near on the outside. Inside, it is provided with a core rod (18) and a connecting screw (19). The upper end cover (12) and the lower end cover (13), the upper handle cover (15) and the lower handle cover (16) are fixed together by inserting clips, with the upper and lower covers closed and both ends open. The proximal ends of the upper end cover (12) and the lower end cover (13) are both inserted and fixed to the axial limit in the knob tube (14). The distal ends of the upper handle cover (15) and the lower handle cover (16) are inserted and fixed to the axial limit in the knob tube (14). The core rod (18) is provided with a... The force end (20), the far end limiting block (21), the slide rail rod (22), the near end limiting block (23), and the rod seat (24) have an axial through hole inside. The screw rod (19) has a screw part (25) at the far end and a screw part (26) at the near end, with an axial through hole inside. The stress end (20) is a hollow frustum shape with an end cap (12) and an end cap (13) extending outward. The inner hole of the screw rod (19) and the outer cross section of the slide rail rod (22) are both regular polygons. The outer wall of the slide rail rod (22) has a pair of inner lead holes (27). The pair of inner lead holes (27) are symmetrical about the central axis of the slide rail rod (22). The screw rod (19) fits perfectly into the circumferentially limiting and axially sliding slide rail rod (22). The screw part (25) has a threaded outer wall, the wire receiving part (26) has a distal limiting ring (28) at its distal end, an external wire guide hole (29) at its middle outer wall, and a proximal limiting ring (30) at its proximal end. Both the distal limiting ring (28) and the proximal limiting ring (30) protrude from the outer wall of the screw part (25). The proximal limiting block (23) protrudes from the outer wall of the slide rail rod (22) at its distal end, and a wire guide post (31) and a protective wall (32) are provided at the inner wire guide hole (27) on the corresponding side of the proximal outer wall. The protective wall (32) is semi-cylindrical and its opening faces the distal end of the proximal limiting block (23). The wire guide post (31) and the protective wall (32) are coaxial and their central axis is perpendicular to the central axis of the slide rail rod (22). The handle cover ( 15) and the inner wall of the lower cover (16) of the handle are provided with a sealing plate (33). The end of the wire feed column (31) is fixed in the sealing plate (33) and the protective wall (32) abuts against the sealing plate (33). The proximal limiting ring (30) is provided with a pair of first wire connecting holes (34) corresponding to a pair of inner wire guide holes (27). The proximal limiting ring (30) is provided with a second wire connecting hole (35) on the same side as the first wire connecting hole (34) of the sealing plate (33). The inner wall of the knob tube (14) is provided with a thread and is just screwed into the screw part (25). The inner walls of the upper end cover (12) and the lower end cover (13) are provided with a distal retaining ring (36). The inner walls of the upper cover (15) and the lower cover (16) of the handle are provided with a proximal retaining ring (37).The distal limiting block (21) is fixed in the distal retaining ring (36) for circumferential limiting, the rod seat (24) is fixed in the proximal retaining ring (37) for circumferential limiting, and the distal end of the hemostatic valve (17) is fixed in the openings of the upper cover (15) and lower cover (16) of the handle and seals the opening of the rod seat (24). It also includes a controllable bending conduit (1), in which a guide wire (2) is provided in the lumen and a pair of drawing cavities (3) are provided parallel to the axial direction in the wall thickness. The pair of drawing cavities (3) are symmetrical about the central axis of the controllable bending conduit (1) and each is provided with a traction wire (4). The distal end of the controllable bending conduit (1) is flexible and a wire-connecting ring (5) is fixed in the wall thickness. The distal end of the traction wire (4) is connected to the fixed wire-connecting ring (5), and the proximal end penetrates the outer wall of the controllable bending conduit (1). The pair of traction wires (4) have different lengths. The controllable bending conduit (1) is provided with a polymer inner layer (6), a metal reinforcing layer (7) and a polymer outer layer (8) from the inside to the outside. The pair of drawing cavities (3) are located between the polymer inner layer (6) and the metal reinforcing layer (7). The metal reinforcing layer (7) is composed of an alloy wire spring coil (9) and / or an alloy wire braided tube (10). The controllable curved catheter (1) passes through the hemostatic valve (17) and the core rod (18) in sequence. A pair of traction wires (4) pass through the inner guide wire hole (27), the outer guide wire hole (29) and the first wire connection hole (34) in sequence. The traction wire (4) with a larger length passes around the wire guide column (31) and is connected to and fixed in the second wire connection hole (35). The traction wire (4) with a smaller length is directly connected to and fixed in the first wire connection hole (34). The hemostatic valve (17) has a first rubber plug (38) and a second rubber plug (39) sealed from the distal end to the proximal end. The first rubber plug (38) has a round hole (40) in the middle, and the second rubber plug (39) has a cross-shaped incision (41) in the middle. The controllable curved catheter (1) passes through the cross-shaped incision (41) and the round hole (40) in sequence. The slide rail rod (22) is provided with several glue injection holes (42), and the core rod (18) is glued and fixed to the controllable bending guide tube (1); When the proximal limiting ring (30) abuts against the proximal limiting block (23), the distal end of the screw part (25) abuts against the proximal opening of the knob tube (14), and when the distal limiting ring (28) abuts against the proximal opening of the knob tube (14), the distal end of the screw part (25) abuts against the distal limiting block (21). When the screw section (25) is located at a certain point in the middle near the opening of the knob tube (14), a pair of traction wires (4) remain in the drawing cavity (3) with a consistent length; When the end cap (12) and end cap (13), and the handle cap (15) and handle cap (16) are inserted and closed, they are glued together for reinforcement.

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