CN219251340U - Traction wire locking device and adjustable bent sheath tube - Google Patents

Abstract

The utility model provides a traction wire locking device and an adjustable bent sheath tube, and relates to the field of interventional therapy conveying appliances. The traction wire locking device is used for locking the traction wire and comprises a first end and a second end which are opposite to each other, the traction wire locking device comprises a shell and a locking assembly, a locking cavity is formed in the shell in a surrounding mode, and the cross section area of at least part of the locking cavity is decreased in the direction that the first end points to the second end; the locking assembly is arranged in the locking cavity, the traction wire is positioned between the cavity wall of the locking cavity and the locking assembly, and the cavity wall of the locking cavity and the locking assembly extrude the traction wire; the locking assembly is movable toward the second end when the traction wire applies a moment to the locking assembly. The traction wire locking device can solve the problems that when the screw is matched with the locking assembly to lock the traction wire, the screw needs to apply a large pretightening force to the traction wire, and the traction wire is easy to damage.

Description

Traction wire locking device and adjustable bent sheath tube

Technical Field

The application relates to the field of interventional therapy conveying apparatuses, in particular to a traction wire locking device and an adjustable bent sheath tube.

Background

Interventional therapy is an important diagnosis and treatment means in the field of cardiovascular diseases at present. In interventional procedures, prior to delivery of therapeutic devices such as stents, occluders, etc. to a target site, it is generally necessary to establish a protective passageway within the patient's blood vessel using a catheter to protect the inner wall of the blood vessel or tissue during delivery. Delivery sheath is an essential guide catheter in interventional procedures. Because of the space characteristics of human tissue structures, in order to more accurately convey the apparatus to the diagnosis and treatment position, the sheath tube, especially the distal end of the sheath tube, must be bent as required in the use process, and the currently feasible scheme has two types of fixed bending and adjustable bending, and as the name implies, the fixed bending is preformed into various bending shapes before entering the blood vessel, and because of individual differences, the adjustable bending sheath tube is difficult to adapt to diversified physiological anatomy structures, and compared with the fixed bending sheath tube, the adjustable bending sheath tube can be appropriately bent in due time according to the actual use condition, can better meet the actual requirement of operation, and is a new technology developed in recent years.

The prior art adjustable bent sheath tube generally comprises a handle and a sheath tube, wherein the handle is arranged at the proximal end of the sheath tube, one or more slender channels are circumferentially distributed in the wall of the sheath tube and extend from the proximal end to the distal end along the axial direction, metal traction wires are arranged in the channels, the proximal end of each traction wire is connected with an adjusting mechanism in the handle such as a sliding block, and the distal end of each traction wire is connected with a pull ring at the distal end of the sheath tube. During the use, the sliding block in the handle is moved to tighten or loosen the traction wire, so that the bending and recovery of the distal end of the sheath tube are realized. The traction wire is generally fixedly connected with the pull ring at the distal end of the sheath tube in a welding or hanging buckle mode, when the sheath tube is bent, the traction wire is in a tensed state, and the proximal end of the traction wire is required not to slip off the sliding block at the moment, namely the traction wire needs to be locked.

In the existing locking device, locking of the traction wire is generally achieved through cooperation of a screw and a threaded hole, for example, the locking device disclosed in patent CN113349845a comprises a locking piece, the locking piece is provided with a threaded hole, the traction wire penetrates through the bottom of the threaded hole, then the screw is screwed into the threaded hole, the traction wire is extruded through the lower end of the screw and the bottom of the threaded hole to achieve locking of the traction wire, however, when the locking device is used for locking, in order to avoid falling off when the traction wire is subjected to a large pulling force, the screw needs to apply a large pretightening force on the traction wire, and therefore the traction wire is easy to be damaged by the screw.

Disclosure of Invention

In view of this, this application provides a traction wire locking device and adjustable curved sheath to solve when using screw and locking subassembly cooperation to realize traction wire locking, the screw needs to exert great pretightning force to traction wire, causes the problem that the traction wire appears damaging easily.

According to an aspect of the present application, there is provided a traction wire locking device for locking a traction wire, the traction wire locking device comprising a first end and a second end opposite to each other, the traction wire locking device comprising a housing enclosing a locking cavity, at least part of the locking cavity decreasing in cross-sectional area in a direction of the first end towards the second end;

the locking assembly is arranged in the locking cavity, the traction wire is positioned between the cavity wall of the locking cavity and the locking assembly, and the cavity wall of the locking cavity and the locking assembly squeeze the traction wire;

the locking assembly is movable toward the second end when the traction wire applies a moment to the locking assembly.

Preferably, the traction wire locking device further comprises an end cap connected with an end of the housing facing the first end, the locking assembly being in contact with the end cap.

Preferably, the locking assembly comprises a locking member and an elastic member, the elastic member is arranged between the locking member and the end cover, the elastic member is compressed, and the locking member and the cavity wall of the locking cavity press the traction wire.

Preferably, a first hole is formed in the shell, a second hole is formed in the end cover, the first hole and the second hole are communicated with the locking cavity, and the traction wire sequentially passes through the first hole, the locking cavity and the second hole.

Preferably, a first thread is arranged on the inner side wall of the shell, a second thread is arranged on the end cover, and the first thread is matched with the second thread.

Preferably, the shell comprises a first shell part and a second shell part, a first locking channel is formed in the first shell part in a surrounding mode, a second locking channel is formed in the second shell part in a surrounding mode, the first locking channel and the second locking channel form the locking cavity, the first end points to the second end, the diameter of the second locking channel is gradually reduced, the locking piece is a steel ball, and the diameter of the steel ball is larger than the minimum diameter of the second locking channel.

Preferably, the first shell portion is cut along a plane where an axis of the shell portion is located, so as to obtain a trapezoid cross section, and an included angle between two waists of the trapezoid cross section is 5 degrees to 15 degrees.

Preferably, the diameter of the first shell portion is a predetermined value, the outer diameter of the second shell portion is tapered in a direction in which the first end is directed toward the second end, and the maximum value of the outer diameter of the second shell portion is equal to the predetermined value.

Preferably, the outer diameter of the end cap is equal to the outer diameter of the first shell portion.

According to another aspect of the present application, there is provided an adjustable bend sheath comprising a slider and the above-mentioned pulling wire locking device, the slider being disposed on one side of the pulling wire locking device, the pulling wire passing through the inside of the slider.

In the use of the traction wire locking device of the application, the sliding block pulls the traction wire, so that the traction wire moves towards the second end, and the traction wire can apply torque to the locking assembly, so that the locking assembly moves towards the second end. Because the cross section area of the locking cavity is decreased in the direction that the first end points to the second end, when the locking component moves to the second end, the distance between the locking component and the cavity wall of the locking cavity is decreased, and the locking component and the cavity wall of the locking cavity can further squeeze the traction wire, so that the locking of the traction wire is realized. In the process that the sliding block pulls the traction wire to move to the far end, the larger the pulling force applied by the sliding block to the traction wire is, the larger the moment applied by the traction wire to the locking component is, the larger the distance that the locking component moves to the second end is, the larger the extrusion force of the locking component to the traction wire is, namely the extrusion force of the locking component to the traction wire is positively correlated with the pulling force applied by the traction wire. Therefore, the extrusion force of the locking component to the traction wire is increased along with the increase of the tensile force of the traction wire, the locking component does not need to apply great pretightening force to the traction wire in the initial stage, the pretightening force received by the traction wire is great when the screw is used for locking in the prior art is effectively avoided, the traction wire is easy to damage, and the integrity of the traction wire is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic view of the relative positions of a traction wire locking device and a slider;

FIG. 2 shows a cross-sectional view of the traction wire locking device taken in a plane of the axis;

fig. 3 shows a schematic structural view of the housing;

FIG. 4 shows a schematic structural view of an end cap;

fig. 5 shows a schematic structural view of the locking assembly.

Icon: 10-pulling a wire; 101-proximal end; 102-distal; 20-sliding blocks; 30-a traction wire locking device; 310-a housing; 311-locking cavity; 312-first hole; 313-a first shell portion; 314-a second shell portion; 315—first thread; 320-end caps; 321-a cover; 322-extensions; 323-second thread; 324-second hole; 330-locking assembly; 331-locking member; 332-elastic member; f-direction of extension.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after a review of the disclosure of the present application.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

In the adjustable curved sheath tube, the traction wire locking device can lock the traction wire so as to tighten or loosen the traction wire by moving the sliding block in the handle, thereby realizing the bending and recovery of the distal end of the sheath tube. The existing traction wire locking device can lock the traction wire, but has different problems in the use process, for example, the locking device disclosed in CN113349845A presses the traction wire through the lower end of a screw and the bottom of a threaded hole to lock the traction wire, however, when the locking device is used for locking in this way, the screw needs to exert larger pretightening force on the traction wire, so that the traction wire is easily damaged by the screw; for another embodiment disclosed in CN113349845a, a spring is used to squeeze the pin shaft, so that the pin shaft compresses the traction wire to lock the traction wire, and if the pin shaft is shorter, the embodiment is not easy to install and adjust, and if the pin shaft is longer, the pin shaft is easy to interfere with the internal structure of the handle, so that the use is more inconvenient; for another example, CN113395989a discloses a locking mode that a traction wire is wound on the bottom of a screw thread, and then the screw is screwed into a threaded hole on an adjusting mechanism, and the locking mode is fixed by extrusion and friction between second threads, which requires that the traction wire cannot be too thick, and has poor adaptability in use. For example, patent CN112244961a discloses a locking manner in which a plurality of wire penetrating holes are distributed along the circumferential direction of a slider, the proximal end of a traction wire sequentially penetrates through the wire penetrating holes, pins are driven into one or a plurality of the wire penetrating holes, and the traction wire is fixed by multistage bending of the traction wire and extrusion of the pins and the wire penetrating holes, so that the locking manner is complex to install, and the length of the traction wire is difficult to adjust.

The traction wire locking device according to the present application is proposed based on this, and will be described below with reference to fig. 1 to 5, wherein the extending direction is a direction in which a first end of the traction wire locking device 30 points to a second end, and the first end is an upper end and the second end is a lower end in the view of fig. 3.

As shown in fig. 1-5, the pull wire locking device 30 includes a first end and a second end opposite each other, the pull wire 10 includes a proximal end 101 and a distal end 102, the proximal end 101 of the pull wire 10 is on the same side as the first end of the pull wire locking device 30, and the distal end 102 of the pull wire 10 is on the same side as the second end of the pull wire locking device 30.

As shown in fig. 2, the traction wire locking device 30 includes a housing 310 and a locking assembly 330, wherein the housing 310 encloses a locking cavity 311, and at least part of the locking cavity 311 has a decreasing cross-sectional area in a direction in which the first end points to the second end, i.e. in the extending direction F; the locking assembly 330 is arranged in the locking cavity 311, the traction wire 10 is positioned between the cavity wall of the locking cavity 311 and the locking assembly 330, and the cavity wall of the locking cavity 311 and the locking assembly 330 squeeze the traction wire 10; the locking assembly 330 is movable toward the distal end 102 when the pull wire 10 applies a moment to the locking assembly 330.

As shown in fig. 1 and 2, the slider 20 is positioned below the pull wire locking device 30 (i.e., the slider 20 is positioned on the side of the pull wire locking device 30 where the second end is positioned), and during use of the pull wire locking device 30, the slider 20 is able to pull the pull wire 10 downward such that the proximal end 101 of the pull wire 10 moves downward, which enables the pull wire 10 to apply a moment to the locking assembly 330 such that the locking assembly 330 moves toward the lower end. Since the cross-sectional area of the locking cavity 311 decreases in the extending direction F, when the locking assembly 330 moves downward, the distance between the locking assembly 330 and the cavity wall of the locking cavity 311 decreases, and the locking assembly 330 and the cavity wall of the locking cavity 311 can further press the traction wire 10, thereby achieving locking of the traction wire 10. In the process that the sliding block 20 pulls the traction wire 10 to move downwards 102, the larger the pulling force exerted by the sliding block 20 on the traction wire 10 is, the larger the moment exerted by the traction wire 10 on the locking assembly 330 is, the larger the downward moving distance of the locking assembly 330 is, the larger the extrusion force of the locking assembly 330 on the traction wire 10 is, namely, the extrusion force of the locking assembly 330 on the traction wire 10 is positively correlated with the pulling force exerted on the traction wire 10. Therefore, the extrusion force of the locking component 330 on the traction wire 10 is increased along with the increase of the tensile force applied to the traction wire 10, and the locking component 330 does not need to apply a large pretightening force on the traction wire 10 in the initial stage, so that the problem that the pretightening force received by the traction wire 10 is large and the traction wire 10 is easily damaged when the screw is used for locking in the prior art is effectively avoided, and the integrity of the traction wire 10 is ensured.

In addition, the compression force of the locking assembly 330 to the traction wire 10 increases as the tension applied to the traction wire 10 increases, and thus, there is no concern that the traction wire 10 will fall off when the tension is large.

When it is desired to pull the proximal end 101 of the pull wire 10 upward, the pull wire 10 can apply a moment to the locking assembly 330, which enables the locking assembly 330 to move upward, at which time the distance between the locking assembly 330 and the cavity wall of the cavity increases, and at which time the pressing force of the locking assembly 330 on the pull wire 10 decreases, which enables the pull wire 10 to be pulled out smoothly, so that the pull wire 10 can be pulled directly upward to adjust the extension length of the proximal end 101 of the pull wire 10 without other actions or using other tools, and the adjustment procedure is simple.

As shown in fig. 2, the traction wire locking device 30 further includes an end cap 320, wherein the end cap 320 is disposed at an end of the housing 310 facing the first end, and the locking assembly 330 is in contact with the end cap 320, so that the end cap 320 can apply a moment to the locking assembly 330 to ensure the stability of locking the locking assembly 330 to the traction wire 10, and simultaneously, the end cap 320 is disposed to prevent the locking assembly 330 from falling off from the locking cavity 311.

As shown in fig. 2 to 4, the end of the housing 310 facing the distal end 102 is provided with a first hole 312, the middle of the end cover 320 is provided with a second hole 324, the diameters of the first hole 312 and the second hole 324 are larger than the diameter of the traction wire 10, and the first hole 312 and the second hole 324 are communicated with the locking cavity 311, so that the proximal end 101 of the traction wire 10 can sequentially pass through the first hole 312, the locking cavity 311 and the second hole 324, and the installation mode of the traction wire 10 is simple.

As shown in fig. 2 and 5, the locking assembly 330 includes a locking member 331 and an elastic member 332, the elastic member 332 being disposed between the locking member 331 and the end cap 320, the pulling wire 10 being located between the cavity wall of the locking cavity 311 and the locking member 331, the elastic member 332 being in a compressed state, which enables the elastic member 332 to apply a force to the locking member 331 toward the distal end 102, further ensuring the stability of the locking of the pulling wire 10 by the locking member 331.

Alternatively, the elastic member 332 may be an elastic member such as a spring or a rubber member.

As shown in fig. 3, the housing 310 may include a first housing portion 313 and a second housing portion 314, the first housing portion 313 encloses a first locking channel, the second housing portion 314 encloses a second locking channel, the first locking channel and the second locking channel form a locking cavity, in the extending direction F, the cross-sectional area of the first locking channel decreases, and the cross-sectional area of the first locking channel may increase, decrease, or be unchanged.

It should be noted that the description of the first and second shell portions 313 and 314 is only for convenience of describing the shape of the housing 310, and the first and second shell portions 313 and 314 are two portions of the housing 310, and there may not be any dividing line between the first and second shell portions 313 and 314 in the solid body of the housing 310.

Alternatively, the first shell portion 313 has a conical shape, and in the extending direction F, the outer diameter of the first shell portion 313 is tapered, and the inner diameter of the first shell portion 313 is also tapered, i.e., the inner surface of the first shell portion 313 is a conical surface, and the diameter of the second locking channel is tapered. The first shell portion 313 is sectioned along a plane in which the extending direction F is located to obtain a trapezoidal section, and an included angle α of two waists of the trapezoidal section is 5 degrees to 15 degrees, for example, 6 degrees, 7 degrees, 7.5 degrees, 8 degrees, 8.3 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 14.9 degrees, or the like.

The second shell portion 314 is cylindrical, the second shell portion 314 is of an equal diameter structure, and the outer diameter of the second shell portion 314 is a predetermined value (the predetermined value is only for convenience of explaining the relationship between the outer diameter of the second shell portion 314 and the outer diameter of the first shell portion 313, the specific value of the outer diameter of the second shell portion 314 may be determined according to the size of the space inside the sheath handle), and the predetermined value is equal to the maximum value of the outer diameter of the first shell portion 313, which makes the outer diameter of the upper end of the housing 310 larger than the outer diameter of the lower end, so that interference of the traction wire locking device 30 with other structures inside the sheath handle can be reduced.

As shown in fig. 3, the inner surface of the second shell portion 314 is divided into two parts, the part at the lower end is a cylindrical surface, the part at the upper end is provided with a first thread 315, and the first thread 315 is used for matching with a second thread 323 on the end cover 320 so as to fix the end cover 320.

Optionally, the outer diameter of the second shell portion 314 is equal to the outer diameter of the cap 321 of the end cap 320, which allows the overall structure of the pull wire locking device 30 to be smooth and unobtrusive, allowing for smaller interior spaces, further avoiding interference of the pull wire locking device 30 with other structures within the sheath handle.

As shown in fig. 4, the end cover 320 includes a cover body 321 and an extension portion 322, the second hole 324 penetrates the cover body 321 and the extension portion 322 along the extension direction F, the outer diameter of the cover body 321 is larger than the outer diameter of the extension portion 322, the second thread 323 is disposed on the outer side wall of the extension portion 322, and the first thread 315 is matched with the second thread 323, so that the end cover 320 and the housing 310 can be fixed.

Preferably, the locking member 331 is a steel ball, the elastic member 332 is a spring, when the proximal end 101 of the traction wire 10 passes through the locking cavity 311 from the first hole 312 of the housing 310, the traction wire 10 is biased to one side by bypassing the steel ball, the steel ball and the inner surface of the second housing 314 squeeze the traction wire 10 under the pressure of the spring, and then the traction wire 10 passes through the inner space of the spring and then passes through the second hole 324.

When the first hole 312 of the proximal end 101 of the traction wire 10 is retracted, the proximal end 101 of the traction wire 10 moves toward the second end (the proximal end 101 of the traction wire 10 moves downward in the view of fig. 2), and due to the friction force generated by the pressing of the locking member 331 on the traction wire 10, when the traction wire 10 is retracted, the traction wire 10 gives a moment to the steel ball, so that the steel ball tends to roll downward, when the traction wire 10 is retracted for a certain distance, the steel ball also rolls downward for a certain distance, and because the distance between the steel ball and the inner surface of the second shell portion 314 becomes smaller, the pressing of the steel ball on the traction wire 10 is more serious, so that the traction wire 10 generates radial compression deformation, and when the traction wire 10 is radially compressed and deformed to a certain extent, the traction wire 10 cannot be retracted smoothly, so as to be locked.

When the length of extension of the proximal end 101 of the traction wire 10 is adjusted, the proximal end 101 of the traction wire 10 needs to be pulled out from the second hole 324 of the end cover 320, the traction wire 10 can give the steel ball a reverse moment due to the friction force, so that the steel ball can roll upwards, when the traction wire 10 extends a certain distance, the steel ball can roll upwards a certain distance, so that the gap between the steel ball and the inner surface of the second shell 314 becomes larger, the extrusion force of the steel ball on the traction wire 10 becomes smaller, the traction wire 10 can be pulled out smoothly, and if the spring pressure is too large, the steel ball can not roll according to the trend, the end cover 320 is unscrewed properly, and the spring pressure is reduced. When the pulling is stopped, the spring can automatically reset the steel balls and compress the traction wire 10 again, and the structure can enable the adjustment of the extension length of the traction wire 10 to be more convenient.

Alternatively, the form of the housing 310 and the locking member 331 is not limited thereto, and for example, the first housing portion 313 may be in a rectangular parallelepiped shape, the second housing portion 314 may be in a quadrangular frustum shape, and the pressing member may be a steel column, the second housing portion 314 may include two first planes and two second planes, the two first planes being parallel, a distance between the two second planes being gradually reduced in the extending direction F, an axis of the steel column may be perpendicular to the first planes, the traction wire 10 being located between a side of the steel column and the second planes, and the side of the steel column being pressed against the traction wire 10.

In addition, the traction wire 10 is locked by the locking piece 331 and the cavity wall of the locking cavity 311, so that the traction wire 10 with different diameters can be adapted, and the adaptability is high.

According to another aspect of the present application, there is provided an adjustable curved sheath, as shown in fig. 1, the adjustable curved sheath includes a slider 20 and the above-mentioned pulling wire locking device 30, the slider 20 is disposed on a side of the second end of the pulling wire locking device 30, and the pulling wire 10 passes through the inside of the slider 20. The adjustable curved sheath has the same technical effects as the above-mentioned traction wire locking device 30, and will not be described here again.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A traction wire locking device for locking a traction wire, the traction wire locking device comprising a first end and a second end opposite to each other, characterized in that the traction wire locking device comprises a housing and a locking assembly, the housing encloses a locking cavity, and in the direction of the first end pointing to the second end, the cross-sectional area of at least part of the locking cavity decreases;

the locking assembly is arranged in the locking cavity, the traction wire is positioned between the cavity wall of the locking cavity and the locking assembly, and the cavity wall of the locking cavity and the locking assembly squeeze the traction wire;

the locking assembly is movable toward the second end when the traction wire applies a moment to the locking assembly.

2. The pull wire locking device of claim 1, further comprising an end cap coupled to an end of the housing toward the first end, the locking assembly in contact with the end cap.

3. The pulling wire locking device of claim 2, wherein the locking assembly includes a locking member and an elastic member, the elastic member disposed between the locking member and the end cap, the elastic member being compressed, the locking member and a wall of the locking chamber compressing the pulling wire.

4. The pulling wire locking device of claim 2, wherein the housing is provided with a first aperture, the end cap is provided with a second aperture, the first aperture and the second aperture are both in communication with the locking chamber, and the pulling wire passes through the first aperture, the locking chamber, and the second aperture in sequence.

5. A traction wire locking device according to claim 3, wherein a first thread is provided on an inner side wall of the housing, a second thread is provided on the end cap, and the first thread is engaged with the second thread.

6. The traction wire locking device according to claim 3, wherein the housing comprises a first housing portion and a second housing portion, wherein the first housing portion encloses a first locking channel, the second housing portion encloses a second locking channel, the first locking channel and the second locking channel form the locking cavity, the diameter of the second locking channel is tapered in a direction that the first end points to the second end, the locking member is a steel ball, and the diameter of the steel ball is larger than the minimum diameter of the second locking channel.

7. The pulling wire locking device of claim 6, wherein the first shell portion is sectioned along a plane in which the axis of the housing is located to obtain a trapezoidal cross section, the included angle of two waists of the trapezoidal cross section being 5 degrees to 15 degrees.

8. The pull wire locking device of claim 6, wherein the diameter of the first housing portion is a predetermined value, the outer diameter of the second housing portion tapers in a direction in which the first end points toward the second end, and the maximum value of the outer diameter of the second housing portion is equal to the predetermined value.

9. The pull wire locking device of claim 8, wherein an outer diameter of the end cap is equal to an outer diameter of the first housing portion.

10. An adjustable bend sheath comprising a slider and a pull wire locking device according to any one of claims 1-9, the slider being arranged on one side of the pull wire locking device, the pull wire passing through the interior of the slider.

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