Adjustable bend catheter

Abstract

The application provides an adjustable bending catheter, which comprises a catheter body and a traction member, the distal end of the catheter body is provided with an adjustable bending section; the traction member comprises a traction wire, a wire tube, a protective sleeve and a compression tube, the distal end of the traction wire is connected with the adjustable bending section, the proximal end of the traction wire is wrapped and fixed in the compression tube, and the remaining part of the traction wire is sequentially movably arranged in the wire tube and the protective sleeve from the distal end to the proximal end; the proximal end of the wire tube and the distal end of the protective sleeve are fixed oppositely, and the proximal end of the wire tube and the distal end of the protective sleeve are seamless in the axial direction of the wire tube and the protective sleeve, and the distal end of the compression tube is movably arranged in the protective sleeve; the compression tube moves in the protective sleeve to drive the traction wire to move in the protective sleeve and the wire tube, so that the adjustable bending section is bent or restored to be flat. The inner cavity of the protective sleeve limits the degree of bending deformation of the traction wire, can avoid the traction wire from being severely bent or broken near the proximal end of the wire tube, and ensures the smooth realization of the bending adjustment function of the adjustable bending catheter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an adjustable bending catheter. BACKGROUND

[0002] Due to less damage to human body and effective shortening of operation time, interventional surgery is a medical technology that has rapidly risen and been popularized in recent years. As an auxiliary device for interventional surgery, a catheter is mainly used to establish a channel between a human body vessel and the outside world to deliver a diagnostic and / or therapeutic device.

[0003] In order to adapt to individual differences in human body anatomical structure, an adjustable bending catheter has been widely used. The adjustable bending catheter is provided with an adjustable bending segment at a distal end of a catheter body. By controlling a handle of the catheter to drive a traction wire connected to the adjustable bending segment to move along an axial direction, the distal end of the catheter body is repeatedly bent between different angles until the bending angle meets specific physiological structure characteristics of a human body lumen, and then the bending angle is locked to align the distal end of the catheter body with an entrance of a target lumen (such as a blood vessel), and then a diagnostic and / or therapeutic device is delivered to the target lumen through the catheter body.

[0004] Referring to Figure 1 , the existing adjustable bending catheter generally sets the traction wire in a wire passing tube 320. The wire passing tube 320 is mostly embedded in a wall of the catheter body 1000, and a proximal end is out of the wall of the catheter body 1000. A proximal end of the traction wire 310 is out of the wire passing tube 320 and connected to a slider 2210 in the handle. By moving the slider 2210, the traction wire 310 is driven to move along the axial direction, thereby driving the adjustable bending segment at the distal end of the catheter body 1000 to bend. Since the traction wire 310 is generally very thin, when the traction wire 310 is pushed by the slider 2210 to move toward the distal end of the catheter body 1000, if the pushing force is large and the pushing speed is too fast, the process of the traction wire 310 entering the wire passing tube 320 will lag behind the moving process of the slider 2210, so that the traction wire 310 is easily bent severely or broken near the proximal end port of the wire passing tube 320 (such as the position A in Figure 1 , which hinders the realization of the bending function of the adjustable bending catheter. SUMMARY

[0005] The present application aims to provide an adjustable bending catheter, which can avoid the traction wire from being bent severely or broken near the proximal end of the wire passing tube, and ensure the smooth realization of the bending function of the adjustable bending catheter.

[0006] In order to achieve the above object, the present application provides an adjustable bending catheter, which comprises a catheter body and a traction member, the catheter body is provided with an adjustable bending section at the distal end; the traction member comprises a traction wire, a wire passing tube, a protective sleeve and a crimping tube, the distal end of the traction wire is connected to the adjustable bending section, the proximal end is wrapped and fixed in the crimping tube, and the remaining part is sequentially and movably arranged in the wire passing tube and the protective sleeve from the distal end to the proximal end; the proximal end of the wire passing tube and the distal end of the protective sleeve are fixed oppositely, and there is no gap between the proximal end of the wire passing tube and the distal end of the protective sleeve in the axial direction of the two, the distal end of the crimping tube is movably arranged in the protective sleeve, and the crimping tube moves in the protective sleeve to drive the traction wire to move in the protective sleeve and the wire passing tube, so that the adjustable bending section is bent or restored to be flat.

[0007] Wherein, the proximal end of the wire passing tube is connected to the distal end of the protective sleeve or the proximal end of the wire passing tube is arranged in the distal end of the protective sleeve.

[0008] Wherein, the protective sleeve comprises a tilt section, a transition section and a flat section connected in sequence, the transition section smoothly connects the tilt section and the flat section, the tilt section is fixed oppositely with the proximal end of the wire passing tube, and the proximal end of the crimping tube is movably arranged in the flat section.

[0009] Wherein, the inner diameter of the protective sleeve is 0.1mm-0.3mm larger than the outer diameter of the crimping tube, and the inner diameter of the protective sleeve is 0.3mm-0.6mm larger than the diameter of the traction wire.

[0010] Wherein, the length of the protective sleeve is greater than the distance that the traction wire needs to move when the adjustable bending section switches between flat and maximum bending angle.

[0011] Wherein, the proximal end of the wire passing tube is arranged outside the catheter body, and the remaining part is embedded in the wall of the catheter body.

[0012] Wherein, the adjustable bending catheter further comprises a bending handle, the bending handle is connected to the proximal end of the catheter body and connected to the proximal end of the crimping tube; the bending handle controls the movement of the crimping tube in the protective sleeve.

[0013] Wherein, the bending handle comprises a fixed base, a driving mechanism and a driving control mechanism; the proximal end of the catheter body is arranged and fixed in the fixed base, the protective sleeve is fixed relative to the fixed base, the crimping tube is connected to the driving mechanism, the driving control mechanism is connected to the driving mechanism and controls the movement of the driving mechanism relative to the fixed base, and the driving mechanism moves to drive the crimping tube to move in the protective sleeve.

[0014] The driving mechanism comprises a sliding block and a fixed block fixed with the sliding block, the crimping tube is fixed with the fixed block, the surface of the sliding block is provided with a screw groove, the driving control mechanism comprises a rotating cylinder, the rotating cylinder is provided with a screw thread engaged with the screw groove, and rotating the rotating cylinder drives the sliding block to move relative to the fixed base.

[0015] The length of the protective sleeve is greater than the maximum stroke of the sliding block.

[0016] The fixed base is provided with an axial groove arranged along the axial direction of the fixed base, and the sliding block is movably arranged in the axial groove, and the rotating cylinder is rotated to drive the sliding block to move along the axial groove.

[0017] The proximal end of the tube body is embedded in the fixed base, the central axis of the tube body coincides with the central axis of the fixed base, the fixed base is provided with an inclined groove, one end of the inclined groove extends to the tube body, and the other end of the inclined groove extends to the axial groove, and the protective sleeve is fixed in the inclined groove.

[0018] The adjustable bending catheter provided by the present application is provided with the crimping tube to wrap and fix the traction wire, the protective sleeve is arranged between the wire passing tube and the crimping tube, the proximal end of the wire passing tube and the distal end of the protective sleeve are seamless in the axial direction, the distal end of the crimping tube is movably arranged in the protective sleeve, and the part of the traction wire between the wire passing tube and the crimping tube is movably arranged in the protective sleeve. In the process of bending or restoring the straightness of the adjustable bending section of the tube body, the crimping tube drives the traction wire to move in the protective sleeve and the wire passing tube, so that the part of the traction wire between the wire passing tube and the crimping tube is always located in the protective sleeve. The inner cavity of the protective sleeve limits the degree of bending deformation of the traction wire, can avoid the traction wire from being severely bent or broken near the proximal end of the wire passing tube, and ensures the smooth realization of the bending function of the adjustable bending catheter. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the structural features and effects of the present application, the following will be combined with the specific embodiments and the drawings to be described in detail.

[0020] Figure 1 It is a schematic view of the traction wire in the existing adjustable bending catheter when the traction wire is severely bent.

[0021] Figure 2 It is a schematic view of the adjustable bending catheter of the embodiment of the present application;

[0022] Figure 3 It is a schematic view of the adjustable bending catheter of the embodiment of the present application;

[0023] Figure 4is a cross-sectional view of the adjustable bending catheter of the embodiment of the present application;

[0024] Figure 5 is Figure 4 is a local enlarged view of II in FIG. 1;

[0025] Figure 6 is a structural view of the structure of the pulling member and the distal end of the tube body in the adjustable bending catheter of the embodiment of the present application;

[0026] Figure 7 is a position state view of the pulling wire, the wire tube, the protective sleeve and the crimping tube in the adjustable bending section of the adjustable bending catheter of the embodiment of the present application at the maximum bending angle;

[0027] Figure 8 is a position state view of the pulling wire, the wire tube, the protective sleeve and the crimping tube in the adjustable bending section of the adjustable bending catheter of the embodiment of the present application at the maximum bending angle;

[0028] Figure 9 is a structural view of the structure of the pulling member and the distal end of the tube body in the adjustable bending catheter of the embodiment of the present application;

[0029] Figure 10 is a structural view of the structure of the pulling member and the distal end of the tube body in the adjustable bending catheter of the embodiment of the present application; DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The drawings are only used for illustrative description and are schematic views, and cannot be understood as limitation to the present application.

[0031] In order to describe the structure of the adjustable bending catheter more clearly, the terms "proximal end" and "distal end" are defined as the terms commonly used in the field of interventional medicine. Specifically, the "distal end" refers to the end far away from the operator during the operation, and the "proximal end" refers to the end close to the operator during the operation.

[0032] Unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by the person skilled in the art. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0033] Please refer to Figures 2 to 5The application provides a bend-adjustable catheter 100. The bend-adjustable catheter 100 comprises a catheter body 10, a bend-adjusting handle 20 and a traction member 30. The bend-adjusting handle 20 is connected to the proximal end of the catheter body 10. The catheter body 10 is provided with a bend-adjustable section 11 at the distal end, and the bending angle of the bend-adjustable section 11 can be adjusted according to actual needs. In the embodiment, the catheter body 10 is provided with a bend-adjustable section 11. It can be understood that in other embodiments of the application, the catheter body 10 can also be provided with a plurality of bend-adjustable sections 11.

[0034] In combination Figure 2 With Figure 6 , the catheter body 10 comprises an inner film 10a, a reinforcing tube 10b sleeved on the inner film 10a and an outer tube 10c sleeved on the reinforcing tube 10b. In the embodiment, the inner film 10a is a flexible tube made of a flexible material such as PTFE, which is easy to bend; the reinforcing tube 10b is a metal woven mesh structure, which has a certain rigidity and can bend in the axial direction, thereby providing support for the catheter body 10 to avoid torsional deformation of the catheter body 10 along the radial direction, while not affecting the bending of the bend-adjustable section 11 of the catheter body 10; the outer tube 10c is made of a material with a certain hardness such as PEBAX to protect the catheter body 10. Moreover, the hardness of the outer tube 10c corresponding to the bend-adjustable section 11 is less than the hardness of other parts of the outer tube 10c, thereby achieving protection of the catheter body 10 while avoiding affecting the bending of the bend-adjustable section 11. Specifically, in the embodiment, the hardness of the PEBAX material adopted by the part of the outer tube 10c corresponding to the bend-adjustable section 11 is less than the hardness of other parts of the outer tube 10c. Further, in the embodiment, the inner film 10a, the reinforcing tube 10b and the outer tube 10c are formed together by hot melt compounding, forming at least one delivery cavity that completely penetrates from the proximal end to the distal end. It can be understood that in other embodiments of the application, the catheter body 10 can only comprise the inner film 10a and / or the outer tube 10c under the condition of meeting the use requirements, and the inner film 10a, the reinforcing tube 10b and the outer tube 10c can also be made of other materials except for the embodiment.

[0035] Further, in some embodiments of the application, the end of the catheter body 10 is an arc-shaped tip head with a smooth surface, i.e. a Tip head, and a radiopaque developing ring (not shown in the figure) such as a tantalum ring is arranged at the proximal side of the Tip head, so that whether the distal end of the catheter body 10 reaches the designated position can be accurately known under the developing equipment.

[0036] Please refer to Figures 3 to 9The traction member 30 comprises a traction wire 31, a wire tube 32, a protective sleeve 33 and a crimping tube 34. The distal end of the traction wire 31 is connected to the adjustable bending section 11, and the proximal end is wrapped and fixed in the crimping tube 34, and the remaining part is sequentially arranged in the wire tube 32 and the protective sleeve 33 from distal to proximal.

[0037] The traction wire 31 is used to pull the adjustable bending section 11 to bend or restore straightness, and has a certain strength. In the embodiment, the traction wire 31 is a single structure, and can also adopt a multi-strand structure. The cross-sectional shape of the traction wire 31 can be circular or various shapes, which is not specifically limited here. The traction wire 31 should be as thin as possible in radial cross-section on the basis of having a certain strength to realize the traction function, so the diameter of the traction wire 31 is preferably 0.05-0.25 mm. The traction wire 31 can be made of metal materials such as stainless steel, tungsten alloy, cobalt-chromium alloy or nickel-titanium alloy, or high polymer with certain strength, which is not specifically limited here. In the embodiment, the traction wire 31 is preferably a stainless steel wire with a diameter of 0.25 mm.

[0038] The traction wire 31 is provided with an anchoring ring 35 at the end connected to the adjustable bending section 11. The anchoring ring 35 is a ring-shaped member, which is sleeved on the adjustable bending section 11, that is, the distal end of the traction wire 31 is connected to the adjustable bending section 11 through the anchoring ring 35. In the embodiment, the anchoring ring 35 is sleeved on the inner membrane 10a at a position corresponding to the adjustable bending section 11. The anchoring ring 35 increases the contact area between the traction member 30 and the adjustable bending section 11 of the pipe body 10, so that the bending of the adjustable bending section 11 can be better pulled. The anchoring ring 35 can be made of metal materials or high polymer materials, and in the embodiment, the anchoring ring 35 is made of metal such as SUS304 stainless steel. The connection mode of the traction wire 31 and the anchoring ring 35 includes but is not limited to adhesion, welding, hot melting, knotting and the like.

[0039] The pulling wire 31 is movably arranged in the wire passing tube 32 to define the pulling direction of the pulling wire 31 through the wire passing tube 32 and protect the pulling wire 31 through the wire passing tube 32. The wire passing tube 32 is embedded in the wall of the tube body 10 and extends along the axial direction of the tube body 10, so that the pulling wire 31 movably arranged in the wire passing tube 32 moves along the axial direction of the tube body 10. The proximal end of the wire passing tube 32 extends out of the wall of the tube body 10 at a specific angle, so that the pulling wire 31 movably arranged in the wire passing tube 32 can extend out of the wire passing tube 32 at a specific angle. In the embodiment, the wire passing tube 32 is embedded between the inner membrane 10a and the reinforcing tube 10b. By embedding the wire passing tube 32 in the tube body 10, the diameter of the tube body 10 can be reduced to ensure that the tube body 10 can easily move in the target lumen of the human body. The material of the wire passing tube 32 can be metal or polymer and other materials suitable for medical devices. The inner diameter of the wire passing tube 32 and the diameter of the pulling wire 31 have a proper gap to ensure that the pulling wire 31 can move smoothly in the wire passing tube 32. In the embodiment, the difference between the inner diameter of the wire passing tube 32 and the diameter of the pulling wire 31 is greater than 0 and less than 0.1 mm.

[0040] The proximal end of the crimping tube 34 is connected to the bending handle 20, so that the proximal end of the pulling wire 31 is connected to the bending handle 20 through the crimping tube 34. In this way, the risk of breaking the pulling wire 31 when the pulling wire 31 is directly connected to the bending handle 20 can be avoided, and the connection strength between the pulling wire 31 and the bending handle 20 can be increased. In addition, the distal end of the crimping tube 34 is movably arranged in the protective sleeve tube 33, that is, when the bending handle 20 drives the crimping tube 34 and the pulling wire 31 to move to adjust the bending state of the adjustable bending section 11, the distal end of the crimping tube 34 is always located in the protective sleeve tube 33. It is worth noting that the proximal end of the wire passing tube 32 is fixed relative to the distal end of the protective sleeve tube 33, and there is no gap between the proximal end of the wire passing tube 32 and the distal end of the protective sleeve tube 33 in the axial direction of the two. The "relative fixation" means that the proximal end of the wire passing tube 32 and the distal end of the protective sleeve tube 33 are fixed by welding, bonding or other methods, or the wire passing tube 32 and the protective sleeve tube 33 are fixed respectively to keep the proximal end of the wire passing tube 32 and the distal end of the protective sleeve tube 33 from moving relative to each other.

[0041] In the embodiment, the proximal end of the wire passing tube 32 is covered in the distal end of the protective sleeve 33 and fixed together. It can be understood that the proximal end of the wire passing tube 32 can also be butted with the distal end of the protective sleeve 33, that is, the distal end of the protective sleeve 33 is butted with the proximal end of the wire passing tube 31 and fixed together; or, the protective sleeve 33 can be extended from the proximal end of the wire passing tube 32, that is, the protective sleeve 33 and the wire passing tube 32 are integrated.

[0042] Since the distal end of the crimping tube 34 is movably arranged in the protective sleeve 33, the inner diameter of the protective sleeve 33 cannot hinder the smooth movement of the crimping tube in the protective sleeve 33, and needs to have a small gap with the traction wire 31 to reduce the radial movement space of the traction wire 31, limit the degree of bending of the traction wire 31, and prevent the traction wire from being excessively bent. Preferably, the inner diameter of the protective sleeve 33 is 0.1mm-0.3mm larger than the outer diameter of the crimping tube 34, and the inner diameter of the protective sleeve 33 is 0.3mm-0.6mm larger than the diameter of the traction wire 31.

[0043] Please refer to Figure 7 and Figure 8 , the length of the protective sleeve 33 needs to be greater than the movement length of the traction wire 31 in the process of adjusting the bendable section 11 of the tube body 10 from the initial straight state to the maximum bending angle, so that the proximal end of the crimping tube 34 is always located in the protective sleeve 33, so that the traction wire 31 exposed between the wire passing tube 32 and the crimping tube 34 is always wrapped by the protective sleeve 33, the inner cavity of the protective sleeve 33 always limits the degree of bending deformation of the traction wire 31, and once the traction wire 31 contacts the inner cavity of the protective sleeve 33 due to bending, the inner cavity of the protective sleeve 33 will immediately generate a pushing force on the bent traction wire 31 to make the traction wire 31 enter the wire passing tube 32, so that the traction wire 31 returns to a relatively straight state, thereby reducing or even avoiding the risk of serious bending or breaking of the traction wire 31 near the proximal end of the wire passing tube 32, and ensuring that the bendable section 11 of the tube body 10 can be smoothly adjusted or restored to be straight. In the embodiment, the cross-sectional shape of the protective sleeve 33 is consistent with the cross-sectional shape of the traction wire 31, and the protective sleeve 33 is preferably made of metal, such as stainless steel, red copper, aluminum alloy, etc. It can be understood that in other embodiments, the protective sleeve 33 can also be made of high polymer with certain strength. Preferably, in the embodiment, the protective sleeve 33 is a stainless steel tube with an inner diameter of 0.7mm and an outer diameter of 1.0mm.

[0044] Further, please refer to Figure 9 and Figure 10In the embodiment, the protective sleeve 33 comprises a straight section 331 axially parallel to the tube body 10, an inclined section 332 having the same inclination angle as the portion of the wire tube 31 penetrating the tube wall of the tube body 10, and a transition section 333 connected between the straight section 331 and the inclined section 332. The transition section 333 is arc-shaped and smoothly connects the inclined section 332 and the straight section 331 to ensure smooth movement of the traction wire 31 in the protective sleeve 33. The inclined section 332 is fixedly connected to the proximal end of the portion of the wire tube 31 penetrating the tube wall of the tube body 10 and has the same inclination angle, so as to avoid blocking the movement of the traction wire 31 in the protective sleeve 33. The crimping tube 34 is movably arranged in the straight section 331, and the length of the straight section 331 is greater than the movement length of the traction wire 31 during the process of adjusting the bendable section 11 from the initial straight state to the maximum bending angle, so that the proximal end of the crimping tube 34 is always located in the protective sleeve 33.

[0045] Please refer to Figures 2 to 5The adjustable handle 20 comprises a fixed base 21, a driving mechanism 22 and a driving control mechanism 23. The proximal end of the tube body 10 is fixed to the fixed base 21, the protective sleeve 33 is preferably fixed to the fixed base 21, the crimping tube 34 is connected to the driving mechanism 22, the driving control mechanism 23 is connected to the driving mechanism 22 to control the movement of the driving mechanism 22 relative to the fixed base 21, and the driving mechanism 22 moves to drive the crimping tube 34 to move in the protective sleeve 33, thereby driving the pull wire 31 to move to adjust the bending state of the adjustable bending section 11. The fixed base 21 is generally cylindrical, and the tube body 10 is arranged in the center of the fixed base 21 and fixed to the fixed base 21. In this embodiment, the fixed base 21 is divided into a first part 211 and a second part 212 that are buckled to each other, and corresponding grooves are arranged on the first part 211 and the second part 212. The grooves on the first part 211 and the second part 212 together form a central hole for arranging the tube body 10, thereby facilitating the arrangement of the tube body 10 in the fixed base 21 and the fixation of the tube body 10 to the fixed base 21. Further, the fixed base 21 is provided with an axial groove 213 arranged axially along the fixed base 21, and an inclined groove 214 extending from the tube body 10 to the axial groove 213. Specifically, the inclined groove 214 comprises an inclined section and a flat section connected to the inclined section, one end of the inclined section is connected to the flat section, and the other end of the inclined section extends to the tube body 10, so that the wire passing tube 32 extending out of the tube wall of the tube body 10 extends into the inclined section; one end of the flat section is connected to the inclined section, and the other end of the flat section extends to the axial groove 213. In this embodiment, the inclination angle of the inclined section is the same as the inclination angle of the inclined section 332 of the protective sleeve 33, and the inclined section 332 and the part of the wire passing tube 32 extending out of the tube wall of the tube body 10 are preferably fixed in the inclined section by gluing, and the flat section 331 of the protective sleeve 33 is preferably fixed in the flat section by gluing, so that the protective sleeve 33 can be stably fixed in the adjustable bending catheter 100.

[0046] The driving mechanism 22 comprises a sliding block 221 and a fixed block 222 fixed with the sliding block 221. In the embodiment, the sliding block 221 is provided with a groove, and the fixed block 222 is embedded and fixed in the groove. The proximal end of the crimping tube 34 is fixed with the fixed block 222. In the embodiment, the crimping tube 34 is preferably fixed with the fixed block 222 by welding. It can be understood that in other embodiments of the application, the crimping tube 34 can also be fixed with the fixed block 222 by bonding or the like. The sliding block 221 is movably arranged in the axial groove 213. The surface of the sliding block 221 is provided with a screw groove 2211. The driving control mechanism 23 comprises a rotating cylinder 231, and the rotating cylinder 231 is provided with a screw thread 2311 engaged with the screw groove 2211. Through the engagement of the screw thread 2311 and the screw groove 2211, rotating the rotating cylinder 231 can drive the sliding block 221 to move in the axial groove 213 along the axial direction of the fixed base body 21. In the application, the crimping tube 34 is fixed with the fixed block 222, and the movement of the sliding block 221 in the axial groove 213 can drive the crimping tube 34 to move in the protective sleeve 33. The traction wire 31 fixed with the crimping tube 34 can then pull the adjustable bending section 11 to adjust the bending or restore the flatness. Further, the driving control mechanism 23 further comprises a rotating handle 232 arranged on the proximal end of the rotating cylinder 231. The outer surface of the rotating handle 232 is provided with an anti-slip structure, so that the rotating cylinder 231 can be more easily rotated by rotating the rotating handle 232.

[0047] Further, the proximal end of the rotating cylinder 231 is fixed with a luer connector 40. The tube body 10 passes through the fixed base body 21 and is connected to the luer connector 40, so that the diagnostic and / or therapeutic instrument passes through the luer connector 40 and the tube body 10 in sequence to reach the target lumen in the human body.

[0048] Further, the bending handle 20 further comprises a shell 50 for protecting the structures arranged therein. The fixed base body 21 and the driving mechanism 22 are accommodated in the shell 50. The distal end of the rotating cylinder 231 is accommodated in the shell 50 and is rotationally connected with the shell 50. The rotating handle 232 is arranged outside the shell 50 for rotation operation. Specifically, the inner wall of the proximal end of the shell 50 is provided with a snap ring 51, and the outer periphery of the rotating cylinder 231 is provided with a clamping groove 2312. The snap ring 51 is clamped in the clamping groove 2312 to realize the rotational connection between the rotating cylinder 231 and the shell 50. Further, in the embodiment, the shell 50 comprises two parts which are detachably connected, so that the fixed base body 21, the driving mechanism 22 and the like can be more easily fixed in the shell 50.

[0049] Further, in the present application, the bending-adjustable handle 20 further comprises an end cap 60 fixed to the distal end of the outer shell 50, and the tube body 10 penetrates the end cap 60 and enters the fixed base 21.

[0050] In the bending-adjustable catheter 100 of the present application, the crimping tube 34 is arranged to wrap and fix the traction wire 31, the protective sleeve 33 is arranged between the wire penetrating tube 32 and the crimping tube 34, and the proximal end of the wire penetrating tube 32 and the distal end of the protective sleeve 33 are in seamless connection in the axial direction of the two, and the distal end of the crimping tube 34 is movably arranged in the protective sleeve 33, so that the part of the traction wire 31 between the wire penetrating tube 32 and the crimping tube 34 is arranged in the protective sleeve 33. In the process of bending or restoring the straightness of the bending-adjustable section 11 of the tube body 10, the crimping tube 34 drives the traction wire 31 to move in the protective sleeve 33 and the wire penetrating tube 32, so that the part of the traction wire 31 between the wire penetrating tube 32 and the crimping tube 34 is always arranged in the protective sleeve 33. The inner cavity of the protective sleeve 33 limits the degree of bending deformation of the traction wire 31, which can avoid the traction wire 31 from being severely bent or broken near the proximal end of the wire penetrating tube 32, and ensures the smooth realization of the bending-adjustable function of the bending-adjustable catheter 100.

[0051] The above is the preferred embodiment of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the protection scope of the present application.

Claims

1. An adjustable bend catheter, comprising: The adjustable bending catheter comprises a tube body and a traction member. The tube body is provided with an adjustable bending section at the distal end. The traction member comprises a traction wire, a wire passing tube, a protective sleeve and a pressure contact tube. The distal end of the traction wire is connected to the adjustable bending section, and the proximal end is wrapped and fixed in the pressure contact tube. The rest of the traction wire is sequentially and movably arranged in the wire passing tube and the protective sleeve from the distal end to the proximal end. The proximal end of the wire passing tube is obliquely extended out of the tube wall of the tube body, and the rest of the wire passing tube is embedded in the tube wall of the tube body. The proximal end of the wire passing tube is fixed opposite to the distal end of the protective sleeve, and there is no gap between the proximal end of the wire passing tube and the distal end of the protective sleeve in the axial direction. The distal end of the pressure contact tube is movably arranged in the protective sleeve. The pressure contact tube moves in the protective sleeve to drive the traction wire to move in the protective sleeve and the wire passing tube, so that the adjustable bending section is bent or restored to be flat. The inner cavity of the protective sleeve generates a pushing force on the bent traction wire to drive the traction wire into the wire passing tube, so that the traction wire is restored to be relatively flat.

2. The steerable catheter of claim 1, wherein, The proximal end of the wire passing tube is connected to the distal end of the protective sleeve, or the proximal end of the wire passing tube is arranged in the distal end of the protective sleeve.

3. The steerable catheter of claim 1 or 2, wherein, The protective sleeve comprises an inclined section, a transition section and a flat section which are sequentially connected. The transition section smoothly connects the inclined section and the flat section. The inclined section is fixed opposite to the proximal end of the wire passing tube. The proximal end of the pressure contact tube is movably arranged in the flat section.

4. The steerable catheter of claim 1, wherein, The inner diameter of the protective sleeve is 0.1-0.3 mm larger than the outer diameter of the pressure contact tube, and the inner diameter of the protective sleeve is 0.3-0.6 mm larger than the diameter of the traction wire.

5. The steerable catheter of claim 1, wherein, The length of the protective sleeve is greater than the distance that the traction wire needs to move when the adjustable bending section switches between flat and maximum bending angle.

6. The steerable catheter of claim 1, wherein, The adjustable bending catheter further comprises a bending handle which is connected to the proximal end of the tube body and connected to the proximal end of the pressure contact tube. The bending handle controls the movement of the pressure contact tube in the protective sleeve.

7. The steerable catheter of claim 6, wherein, The bending handle comprises a fixed base, a driving mechanism and a driving control mechanism. The proximal end of the tube body is arranged and fixed in the fixed base. The protective sleeve is fixed relative to the fixed base. The pressure contact tube is connected to the driving mechanism. The driving control mechanism is connected to the driving mechanism and controls the movement of the driving mechanism relative to the fixed base. The driving mechanism moves to drive the pressure contact tube to move in the protective sleeve.

8. The steerable catheter of claim 7, wherein, The driving mechanism comprises a sliding block and a fixed block which is fixed to the sliding block. The pressure contact tube is fixed to the fixed block. The surface of the sliding block is provided with a screw groove. The driving control mechanism comprises a rotating cylinder which is provided with a screw thread which is engaged with the screw groove. Rotating the rotating cylinder drives the sliding block to move relative to the fixed base.

9. The steerable catheter of claim 8, wherein, The length of the protective sleeve is greater than the maximum stroke of the sliding block.

10. The steerable catheter of claim 8, wherein, The fixed base is provided with an axial groove which is arranged in the axial direction of the fixed base. The sliding block is movably arranged in the axial groove. Rotating the rotating cylinder drives the sliding block to move along the axial groove.

11. The steerable catheter of claim 10, wherein, The pipe body proximal end is embedded in the fixed base body, and the central axis of the pipe body coincides with the central axis of the fixed base body, the fixed base body is provided with an inclined groove, one end of the inclined groove extends to the pipe body, and the other end extends to the axial groove, and the protective sleeve is fixed in the inclined groove.

12. The steerable catheter of claim 8, wherein, The tuning handle further comprises a shell, the driving mechanism is accommodated in the shell, and the distal end of the rotating cylinder is accommodated in the shell and rotationally connected with the shell.

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