CN217960935U - Controllable bent catheter and control handle thereof - Google Patents

Abstract

The utility model discloses a controllable curved catheter and brake valve lever thereof, be equipped with in the controllable curved catheter lumen and be on a parallel with the axial in seal wire and the wall thickness and be equipped with one pair of wire drawing chamber, a pair of wire drawing intracavity portion all is equipped with the traction wire, controllable curved catheter distal end has the compliance, and is a pair of the traction wire has different length, the brake valve lever outside is equipped with tip upper cover, tip lower cover, knob pipe, stalk portion upper cover, stalk portion lower cover and hemostasis valve by far and near in proper order, and inside is equipped with the core bar and connects a screw member, the utility model discloses well brake valve lever adopts a pair of traction wire to have different length in single thread screw rod and the controllable curved catheter, has realized the two-way controllable crooked of pipe, compares the two-way controllable curved catheter brake valve lever who adopts positive and negative double thread screw rod among the prior art, constitutes part small in quantity, low in manufacturing cost, and the transmission is more smooth, and the accuse is curved more laborsaving, easily production assembly.

Description

Controllable bent catheter and control handle thereof

Technical Field

The utility model relates to the technical field of medical equipment, in particular to controllable curved pipe and brake valve lever thereof.

Background

The catheter is used for human diaphragm puncture, cardiovascular intervention, peripheral vascular intervention, other human body lumen intervention or minimally invasive treatment, heart interatrial septum puncture, renal artery ablation, heart valve repair, tumor intervention embolization and other operations with bifurcated vessels and needing accurate positioning, and is an indispensable auxiliary tool in the operations of generally establishing a channel from the outside of a body to a target position in advance by using a pre-plastic catheter, so as to provide a channel for subsequent guide wires or other instruments to enter diagnosis and treatment. However, due to the difference in the personalized structure of the human body, the pre-plastic catheter cannot be completely adapted to all clinical requirements, and once the inserted catheter does not conform to the physiological structure of the patient, the catheter needs to be withdrawn and reinserted again, thereby increasing the operation time and possibly causing injury to the patient.

In order to adapt to individual differences of human physiological anatomical structures, the controllable bent catheter is produced and widely applied. The controllable bending catheter is characterized in that a controllable bending section is arranged at the far end of a catheter body of the catheter, a handle of the controllable bending catheter is used for driving a traction wire connected with the controllable bending section to move axially, so that the far end of the catheter body is bent into different angles, when the bending angle of the controllable bending section accords with the specific physiological structural characteristics of a human lumen, the handle is stopped being operated, the far end of the catheter body is aligned to the inlet of a target lumen, and then diagnosis and/or treatment instruments are conveyed into the target lumen through the catheter body.

The current steerable catheter is divided into one-way, two-way, three-way and four-way steerable catheters according to the number of internal traction wires, and among them, the two-way steerable catheter is used in many applications. Taking CN202011195322.8 and CN202022669517.3 as examples, in the prior art, a control handle of a bidirectional controllable bending catheter realizes bidirectional controllable bending of the catheter through a rotating device comprising a screw with positive and negative threads, the screw with positive and negative threads rotates in a single direction to drive a moving element connected with a traction wire to move in a reverse direction, so that a difference is generated between lengths of parts of a pair of traction wires left in the thickness of the wall of the catheter, and the distal end of the catheter with flexibility bends towards one side of the traction wire with a shorter length of the part left in the thickness of the wall of the catheter, wherein the pair of traction wires are symmetrically arranged with respect to the catheter and generally have the same length of a central axis.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of above-mentioned prior art, the utility model provides a controllable curved pipe and brake valve lever thereof, brake valve lever adopt single thread screw rod and controllable curved pipe in a pair of traction wire have different length, the succinct ingenious curved structural design of accuse of cooperation, realized the two-way controllable bending of pipe, have that the transmission is more smooth, accuse curved more laborsaving, easily production assembly, reduction in manufacturing cost, fault rate are low, stability advantage such as strong.

In order to achieve the above object, the technical solution of the present invention is: the controllable curved catheter is characterized in that a guide wire is arranged in a lumen of the controllable curved catheter, a pair of wire drawing cavities are arranged in the wall thickness in parallel to the axial direction, the pair of wire drawing cavities are symmetrical about a central axis of the controllable curved catheter, traction wires are arranged in the wire drawing cavities, the far end of the controllable curved catheter has flexibility, a wire receiving ring is fixed in the wall thickness, the far end of each traction wire is connected with the fixed wire receiving ring, the near end of each traction wire penetrates through the outer wall of the controllable curved catheter, and the pair of traction wires have different lengths.

Preferably, the controllable bending catheter is provided with a polymer inner layer, a metal reinforcing layer and a polymer inner layer from inside to outside.

Preferably, a pair of said drawing cavities is located between the polymer inner layer and the metal reinforcing layer.

Preferably, the metal reinforcing layer is composed of alloy wire spring rings and/or alloy wire braided tubes.

The control handle based on the controllable bent catheter comprises:

the external part of the control handle is sequentially provided with an end part upper cover, an end part lower cover, a knob tube, a handle part upper cover, a handle part lower cover and a hemostatic valve from far to near, the internal part is provided with a core rod and a screw rod piece, the end part upper cover, the end part lower cover, the handle part upper cover and the handle part lower cover are fixed in a plug-in manner in pairs, the upper cover and the lower cover are closed and have two open ends, the near ends of the end part upper cover and the end part lower cover are fixed in the knob tube in a plug-in manner and are axially limited, the far ends of the handle part upper cover and the handle part lower cover are fixed in the knob tube in a plug-in manner, the core rod is sequentially provided with a stress end, a far end limiting block, a slide rail rod, a near end limiting block and a rod seat from far to near, the internal part is provided with a through hole, the far end of the screw rod piece is provided with a screw part, the near end is provided with a screw part, the internal part is axially through hole, the stress end is in a hollow round platform shape and extends out of the end upper cover and the end part lower cover, the inner hole of the screw rod piece and the outer edge section of the slide rail rod are regular polygons, the outer wall of the slide rail rod is provided with a pair of inner guide wire holes, the pair of inner guide wire holes are symmetrical about the middle shaft of the slide rail rod, the screw rod piece just sleeves the slide rail rod and is limited in circumferential direction and slides axially, the outer wall of the screw rod part is provided with threads, the far end of the screw rod part is provided with a far end limit ring piece, the outer wall of the middle part is provided with an outer guide wire hole, the near end of the screw rod part is provided with a near end limit ring piece, the far end limit ring piece and the near end limit ring piece are both protruded out of the outer wall of the screw rod part, the far end of the near end limit block is protruded out of the outer wall of the slide rail rod and is provided with a wire moving column and a protection wall at the inner guide wire hole at the side corresponding to the outer wall of the near end, the protection wall is in a semi-cylindrical shape and has an opening facing to the far end of the near end block column and the protection wall are coaxial and the middle shaft is perpendicular to the slide rail rod middle shaft, the inner walls of the upper cover and the lower cover of the handle part are provided with plugging pieces, the wire moving column end is fixed in the plugging piece in a plug-in card mode, the protection wall abuts against the plugging piece, a pair of first wire connecting holes are formed in the position, corresponding to a pair of inner leading wire holes, of the near-end limiting ring piece, second wire connecting holes are formed in the position, adjacent to the plugging piece, of the first wire connecting holes on the same side of the plugging piece, of the near-end limiting ring piece, threads are arranged on the inner wall of the knob pipe and are just screwed with screw parts, far-end clamping rings are arranged on the inner walls of the end part upper cover and the end part lower cover, near-end clamping rings are arranged on the inner walls of the handle part upper cover and the handle part lower cover, the far-end limiting block is fixed in the far-end clamping rings in a circumferential limiting mode, the rod seat is fixed in the near-end clamping rings in a circumferential limiting mode, and the far-end clamping card of the hemostatic valve is fixed in openings of the handle part upper cover and the handle part lower cover and blocks the rod seat opening;

the controllable bent catheter sequentially penetrates through the hemostatic valve and the core rod, the pair of traction wires sequentially penetrates through the inner wire guiding hole, the outer wire guiding hole and the first wire receiving hole respectively, the traction wire with larger length bypasses the wire guiding column to be connected and fixed with the second wire receiving hole, and the traction wire with smaller length is directly connected and fixed with the first wire receiving hole.

As preferred, the shutoff has first rubber buffer and second rubber buffer in proper order by far away and nearly in the hemostasis valve near-end opening, first rubber buffer middle part is equipped with the round hole, second rubber buffer middle part is equipped with the cross incision, controllable curved pipe runs through cross incision and round hole in proper order.

Preferably, the slide rail rod is provided with a plurality of glue injection holes, and the core rod is fixed with the controllable bent guide pipe in a gluing mode.

Preferably, the far end of the screw part abuts against the near end opening of the knob tube when the near end limiting ring piece abuts against the near end limiting block, and the far end of the screw part abuts against the far end limiting block when the far end limiting ring piece abuts against the near end opening of the knob tube.

Preferably, when the middle part of the screw rod part is positioned at the opening of the proximal end of the knob tube, the part of the pair of traction wires left in the wire drawing cavity has consistent length.

Preferably, the end upper cover and the end lower cover, and the handle upper cover and the handle lower cover are glued and reinforced when being combined in a two-by-two card-inserting manner.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model has the following beneficial effect:

the utility model discloses well brake valve lever adopts single thread screw rod and controllable curved pipe in a pair of traction wire have different length, the two-way controllable bending of pipe has been realized, brake valve lever structural design is succinct ingenious, the perfect and accurate cooperation of inside part detail, the curved transmission of smooth accurate accuse has been ensured through stabilizing abundant spacing mechanism, compare the two-way controllable curved pipe brake valve lever who adopts positive and negative double thread screw rod among the prior art, it is few to constitute part quantity, low in manufacturing cost, the transmission is more smooth, the curved more laborsaving of accuse, easily the production assembly.

Drawings

Fig. 1 is a perspective view of an embodiment of a steerable catheter and a control handle thereof according to the present invention.

Fig. 2 is a schematic structural view of the steerable catheter, the traction wire and the guide wire in an embodiment of the steerable catheter and the control handle thereof according to the present invention.

Fig. 3 is a schematic structural diagram of the steerable catheter, the traction wire, the guide wire and the wire-drawing ring according to an embodiment of the steerable catheter and the control handle thereof of the present invention.

Fig. 4 is a schematic structural diagram of a polymer outer layer, a metal reinforcing layer and a polymer inner layer in an embodiment of the steerable catheter and its control handle of the present invention.

Fig. 5 is a perspective view of an embodiment of a steerable catheter and its control handle of the present invention with the end cap and handle cap removed.

Fig. 6 is an exploded view of an embodiment of the steerable catheter and its control handle of the present invention.

Fig. 7 is a perspective view of a core rod of an embodiment of the steerable catheter and its control handle of the present invention.

In the figure: 1. a controllably bendable catheter; 2. a guide wire; 3. a wire drawing cavity; 4. drawing wires; 5. connecting a wire ring; 6. an inner polymer layer; 7. a metal reinforcing layer; 8. an outer polymer layer; 9. an alloy wire spring ring; 10. weaving a tube by using alloy wires; 11. a control handle; 12. an end upper cover; 13. an end lower cover; 14. a knob tube; 15. a handle upper cover; 16. a handle lower cover; 17. a hemostatic valve; 18. a core bar; 19. connecting a screw rod piece; 20. a stress end; 21. a distal stop block; 22. a slide rail rod; 23. a proximal end limiting block; 24. a rod seat; 25. a screw section; 26. a wire connecting part; 27. an inner threading hole; 28. a distal stop ring tab; 29. an external guide wire hole; 30. a proximal end stop ring; 31. a wire feeding column; 32. a protective wall; 33. a plugging sheet; 34. a first wire connecting hole; 35. a second wire connecting hole; 36. a distal collar; 37. a proximal collar; 38. a first rubber plug; 39. a second rubber plug; 40. a circular hole; 41. a cross-shaped cut; 42. injecting glue holes; 43. and (5) rubbing the texture.

Detailed Description

The following detailed description of the present invention will be made with reference to specific embodiments (in the field of medical devices, the distal end refers to one end of the medical device controlled by an operator or outside the human body, and the proximal end refers to the other end of the medical device exerting a diagnosis/treatment effect or inside the human body, thereby extending and defining the distal and proximal directions, and accordingly naming the distal and proximal convenient detailed description of the individual parts):

referring to fig. 1 to 7, the present embodiment is a controllable curved catheter and a control handle which are matched with each other, and is used for interventional therapy operations, such as interventional embolization operations, etc., wherein:

the controllable bending catheter comprises a controllable bending catheter 1, wherein a guide wire 2 is arranged in a lumen of the controllable bending catheter 1, a pair of wire drawing cavities 3 are arranged in the wall thickness in parallel to the axial direction, the pair of wire drawing cavities 3 are symmetrical about the central axis of the controllable bending catheter 1, traction wires 4 are arranged inside the pair of wire drawing cavities 3, the far end of the controllable bending catheter 1 is flexible, a wire connecting ring 5 is fixed in the wall thickness, the far end of each traction wire 4 is connected with and fixed to the wire connecting ring 5, the near end of each traction wire penetrates through the outer wall of the controllable bending catheter 1, the pair of traction wires 4 are different in length, the controllable bending catheter 1 is provided with a polymer inner layer 6, a metal reinforcing layer 7 and a polymer inner layer 6 from inside to outside, and the pair of wire drawing cavities 3 are positioned between the polymer inner layer 6 and the metal reinforcing layer 7;

the control handle 11, the exterior of the control handle 11 is provided with an end upper cover 12, an end lower 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, the interior is provided with a core rod 18 and a thread-connecting screw rod piece 19, the end upper cover 12, the end lower cover 13, the handle upper cover 15 and the handle lower cover 16 are fixed in a two-by-two inserting manner, the upper cover and the lower cover are closed and have two open ends, the proximal ends of the end upper cover 12 and the end lower cover 13 are fixed in the knob tube 14 in an inserting manner, the axial limiting is realized, the handle upper cover 15 and the distal end of the handle lower cover 16 are fixed in the knob tube 14 in an inserting manner, the middle part of the knob tube 14 is in an annular protrusion, the outer wall of the knob tube is provided with friction textures 43, the friction textures 43 are changed into a strip-shaped protrusion parallel to the central axis of the knob tube, the core rod 18 is provided with a stress end 20, a distal limit block 21, a slide rail rod 22, a proximal limit block 23 and a rod seat 24 in sequence from far to near, the interior is perforated in an axial direction, the far end of the screw rod piece 19 is provided with a screw rod part 25, the near end is provided with a screw rod part 26, the inner part of the screw rod piece 19 is axially penetrated and opened, the stress end 20 is in a hollow round table shape and extends out of the upper end cover 12 and the lower end cover 13, the inner hole of the screw rod piece 19 and the outer edge section of the slide rail rod 22 are in regular hexagon, the outer wall of the slide rail rod 22 is provided with a pair of inner lead screw holes 27 and a plurality of glue injection holes 42, the pair of inner lead screw holes 27 are symmetrical about the central axis of the slide rail rod 22, the screw rod piece 19 just sleeves the slide rail rod 22 and circumferentially limits axial sliding, the outer wall of the screw rod part 25 is provided with threads, the far end of the screw rod part 26 is provided with a far end limit ring piece 28, the outer wall of the middle part is provided with an outer lead screw hole 29, the near end is provided with a near end limit ring piece 30, the far end limit ring piece 28 and the near end limit ring piece 30 are both protruded out of the outer wall of the screw rod part 25, the near end limit piece 23 is protruded out of the outer wall of the slide rail rod 22, and the inner lead screw rod hole 27 at the corresponding side of the near end outer wall is provided with a lead post 31 and a protection wall 32, the protection wall 32 is semi-cylindrical and has an opening facing the far end of the near end limiting block 23, the wire feeding column 31 and the protection wall 32 are coaxial and have a central axis perpendicular to the central axis of the slide rail rod 22, the inner walls of the handle upper cover 15 and the handle lower cover 16 are provided with plugging pieces 33, the end of the wire feeding column 31 is inserted and fixed in the plugging pieces 33, the protection wall 32 abuts against the plugging pieces 33, the near end limiting ring piece 30 is provided with a pair of first wire connecting holes 34 corresponding to the pair of inner wire connecting holes 27, the near end limiting ring piece 30 is provided with a second wire connecting hole 35 adjacent to the first wire connecting hole 34 on the same side as the plugging pieces 33, the inner wall of the knob tube 14 is provided with threads and is just screwed with the screw rod part 25, the inner walls of the end upper cover 12 and the end lower cover 13 are provided with a far end retainer ring 36, the inner walls of the handle upper cover 15 and the handle lower cover 16 are provided with a near end retainer ring 37, the far end limiting block 21 is fixed in the far end retainer ring 36, the rod seat 24 is fixed in the near end retainer ring 37, and the stop the hemostatic valve 17 is fixed in the opening of the handle upper cover 15 and blocks the rod seat 24;

the controllable bent catheter 1 sequentially penetrates through the hemostatic valve 17 and the core rod 18, the pair of traction wires 4 sequentially penetrates through the inner guide wire hole 27, the outer guide wire hole 29 and the first wire receiving hole 34 respectively, the traction wire 4 with larger length bypasses the wire moving column 31 to be connected and fixed with the second wire receiving hole 35, the traction wire 4 with smaller length is directly connected and fixed with the first wire receiving hole 34, a first rubber plug 38 and a second rubber plug 39 are sequentially plugged in a near-end opening of the hemostatic valve 17 from far to near, a round hole 40 is arranged in the middle of the first rubber plug 38, a cross cut 41 is arranged in the middle of the second rubber plug 39, and the controllable bent catheter 1 sequentially penetrates through the cross cut 41 and the round hole 40;

in the above embodiments and other embodiments of the present invention:

the metal reinforcing layer 7 is composed of an alloy wire spring ring 9 and/or an alloy wire knitted tube 10, as shown in fig. 4, the metal reinforcing layer 7 may be a single layer alloy wire knitted tube 10 (a), a single layer alloy wire spring ring 9 (b), a single layer structure (c) formed by splicing the alloy wire spring ring 9 with the alloy wire knitted tube 10, a two-layer structure (d) formed by internally and externally sleeving the single layer alloy wire knitted tube 10 and the single layer alloy wire spring ring 9, or a multi-layer structure formed by randomly combining four conditions of a, b, c and d;

the core rod 18 is fixed with the controllable bent guide tube 1 through glue injection of the glue injection hole 42, the controllable bent guide tube 1 is prevented from being separated from the core rod 18 to affect the operation when entering the human body to work, the end upper cover 12, the end lower cover 13, the handle upper cover 15 and the handle lower cover 16 are glued and reinforced when being clamped and covered in pairs, and the shell structure of the control handle 11 is firmer;

the traction wire 4 is one of tungsten wires, nickel-titanium wires or stainless steel wires and other alloy wires, and has excellent strength and toughness;

when the middle part of the screw rod part 25 is positioned at the opening of the near end of the knob tube 14, a pair of traction wires 4 are left in the wire drawing cavity 3 and have a consistent length, and at the moment, the far end of the catheter is not bent, when the knob tube 14 is rotated to drive the screw rod part 25 to move towards the far end of the core rod 18, the near end limit ring sheet 30 drives the far ends of the pair of traction wires 4 to synchronously move towards the far end of the core rod 18, so that the part of the traction wires 4 which have a longer total length and are connected and fixed with the second wire receiving holes 35 at the near end is enlarged in length and the other part of the traction wires 4 which have a longer total length and are connected and fixed with the second wire receiving holes 35 at the near end by bypassing the wire removing column 31 on the wire receiving holes 34 is reduced in length, therefore, the length of the traction wires 4 which are left in the wire drawing cavity 3 is shorter than the total length and the length of the traction wires 4 which are connected and fixed with the first wire receiving holes 34 at the near end is left in the wire drawing cavity 3 is small in length, so that the far end of the controllable bent catheter 1 is bent towards the side of the traction wire 4 which has a flexible flexibility and the longer total length, and when the screw rod part is rotated to drive the far end of the screw rod part 25 to move towards the near end 18, the proximal limit ring piece 30 drives the distal ends of a pair of traction wires 4 to synchronously move towards the proximal end of the core rod 18, so that the part of the traction wires 4 with longer total length and the proximal ends connected and fixed with the second wire receiving holes 35 is shortened while the other part of the traction wires 4 with longer total length bypasses the wire moving column 31 and is connected and fixed with the second wire receiving holes 35, therefore, the length of the traction wires 4 left in the wire drawing cavity 3 is shorter than the total length and the length of the traction wires 4 with the proximal ends connected and fixed with the first wire receiving holes 34 is longer than the length of the traction wires 4 left in the wire drawing cavity 3, so that the distal end of the flexible controllable bending catheter 1 bends towards one side of the traction wires 4 with shorter total length, thereby realizing the controllable bidirectional bending of the catheter, wherein, when the proximal limit ring piece 30 abuts against the proximal limit block 23, the distal end of the screw rod part 25 abuts against the proximal end opening of the knob tube 14, when the distal limit ring piece 28 abuts against the proximal end opening of the knob tube 14, the stroke length of the proximal stop ring 30 is defined as the length of the screw portion 25. Furthermore, the method is simple. The utility model discloses a can adjust factors such as a pair of traction wire 4 length and the 30 stroke length of near-end spacing ring piece according to reality application requirement and acquire the angle and the shape of expected bilateral bending in actual design production.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. Controllable curved pipe, be equipped with in controllable curved pipe (1) lumen and be on a parallel with the axial in seal wire (2) and the wall thickness and be equipped with one pair of wire drawing chamber (3), it is a pair of wire drawing chamber (3) all are equipped with traction wire (4) about controllable curved pipe (1) axis symmetry and inside, controllable curved pipe (1) distal end has compliance and is fixed with in the wall thickness and connects wire ring (5), fixed wire ring (5) that connect is connected to traction wire (4) distal end, and the near-end runs through controllable curved pipe (1) outer wall, its characterized in that: a pair of said pull wires (4) having different lengths.

2. The steerable catheter of claim 1, wherein: the controllable bent catheter (1) is provided with a polymer inner layer (6), a metal reinforcing layer (7) and a polymer outer layer (8) from inside to outside.

3. The steerable catheter of claim 2, wherein: the pair of wire drawing cavities (3) is positioned between the polymer inner layer (6) and the metal reinforcing layer (7).

4. The steerable catheter of claim 2, wherein: the metal reinforcing layer (7) is composed of an alloy wire spring ring (9) and/or an alloy wire braided tube (10).

5. The control handle for a steerable catheter according to any of claims 1-4, wherein:

the external part of the control handle (11) is sequentially provided with an upper end cover (12), a lower end cover (13), a knob tube (14), an upper handle cover (15), a lower handle cover (16) and a hemostatic valve (17) from far to near, the internal part is provided with a core rod (18) and a thread-connecting screw rod piece (19), the upper end cover (12), the lower end cover (13), the upper handle cover (15) and the lower handle cover (16) are fixed in a pairwise inserting manner, the upper and lower covers are closed and are open at two ends, the proximal ends of the upper end cover (12) and the lower end cover (13) are fixed in the knob tube (14) in an inserting manner and are axially limited, the upper handle cover (15) and the lower handle cover (16) are sequentially provided with a stress end (20), a distal end limit block (21), a slide rail rod (22), a proximal end limit block (23) and a rod seat (24), the internal shaft upwards penetrates through a hole, the thread-connecting screw rod piece (19) is provided with a screw rod part (25), the proximal end part is provided with a thread-connecting screw rod (26), the external wall of the hollow slide rail rod (19) and the thread-connecting screw rod (22) and the outer wall of the hollow slide rail rod (13) and the hollow slide rail rod (27), the pair of inner lead screw holes (27) are symmetrical about the center shaft of the slide rail rod (22), the lead screw rod piece (19) is just sleeved with the slide rail rod (22) to circumferentially limit and axially slide, the outer wall of the screw rod part (25) is provided with threads, the far end of the lead screw part (26) is provided with a far end limit ring piece (28), the outer wall of the middle part is provided with an outer lead screw hole (29), the near end is provided with a near end limit ring piece (30), the far end limit ring piece (28) and the near end limit ring piece (30) are both protruded out of the outer wall of the screw rod part (25), the far end of the near end limit block (23) is protruded out of the outer wall of the slide rail rod (22), and a lead screw column (31) and a protective wall (32) are arranged at the inner lead screw hole (27) at one side corresponding to the near end outer wall, protection wall (32) are the half cylinder face and the opening is towards near-end stopper (23) distal end, it is coaxial and axis perpendicular to slide rail pole (22) axis to walk silk post (31) and protection wall (32), stalk portion upper cover (15) and stalk portion lower cover (16) inner wall are equipped with shutoff piece (33), it is fixed in shutoff piece (33) and protection wall (32) butt shutoff piece (33) to walk silk post (31) end plug-in card, corresponding a pair of internal threading hole (27) department is equipped with a pair of first silk receiving hole (34) on near-end spacing ring piece (30), it locates to establish to be close on near-end spacing ring piece (30) and connect silk hole (34) of plug piece (33) homonymy first silk receiving hole (34) department The inner wall of the knob tube (14) is provided with threads and is just screwed with a screw rod part (25), the inner walls of the end part upper cover (12) and the end part lower cover (13) are provided with a far end clamping ring (36), the inner walls of the handle part upper cover (15) and the handle part lower cover (16) are provided with a near end clamping ring (37), the far end limiting block (21) is fixed in a clamping manner in the far end clamping ring (36) for circumferential limiting, the rod seat (24) is fixed in a clamping manner in the near end clamping ring (37) for circumferential limiting, and the far end of the hemostatic valve (17) is fixed in openings of the handle part upper cover (15) and the handle part lower cover (16) in a clamping manner and blocks the opening of the rod seat (24);

the controllable bent catheter (1) sequentially penetrates through the hemostatic valve (17) and the core rod (18), the pair of traction wires (4) sequentially penetrates through the inner wire guiding hole (27), the outer wire guiding hole (29) and the first wire receiving hole (34) respectively, the traction wire (4) with larger length bypasses the wire guiding column (31) to be connected and fixed with the second wire receiving hole (35), and the traction wire (4) with smaller length is directly connected and fixed with the first wire receiving hole (34).

6. The control handle of claim 5, wherein: hemostatic valve (17) near-end opening is middle to be equipped with round hole (40) by far and near shutoff in proper order first rubber buffer (38) and second rubber buffer (39), second rubber buffer (39) middle part is equipped with cross incision (41), controllable curved pipe (1) runs through cross incision (41) and round hole (40) in proper order.

7. The control handle according to claim 6, wherein: the slide rail rod (22) is provided with a plurality of glue injection holes (42), and the core rod (18) is fixed with the controllable bent guide pipe (1) in a gluing mode.

8. The control handle of claim 7, wherein: the utility model discloses a knob pipe, including proximal end stopper piece (23), screw portion (25) distal end butt knob pipe (14) proximal end opening when proximal end stopper ring piece (30) butt proximal end stopper (23), screw portion (25) distal end butt distal end stopper (21) when distal end stopper ring piece (28) butt knob pipe (14) proximal end opening.

9. The control handle according to claim 8, wherein: when the middle part of the screw rod part (25) is positioned at the opening of the near end of the knob tube (14), the part of the pair of traction wires (4) left in the wire drawing cavity (3) has consistent length.

10. The control handle of claim 9, wherein: and the end part upper cover (12), the end part lower cover (13), the handle part upper cover (15) and the handle part lower cover (16) are glued and reinforced when being clamped and covered in pairs.

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