CN219290388U - Adjustable bent sheath tube - Google Patents

Abstract

The utility model provides an adjustable bent sheath tube, which comprises a sheath tube and a handle, wherein the handle comprises a first screw rod, a second screw rod, a nut, a first wire drawing and a second wire drawing, two ends of the first wire drawing are respectively connected with a first position of the distal end or a first screw rod close to the distal end of the sheath tube, two ends of the second wire drawing are respectively connected with a second position of the distal end or a second screw rod close to the distal end of the sheath tube, the first screw rod is provided with a first connecting structure, the second screw rod is provided with a second connecting structure, the first connecting structure and the second connecting structure can mutually axially move, the nut is sleeved on the first screw rod and the second screw rod, the first screw rod is provided with a first thread, the second screw rod is provided with a second thread, the directions of the first thread and the second thread are opposite, the nut is provided with a thread groove matched with the first thread and the first thread, and the nut is rotated clockwise to drive the first screw rod to move towards the distal end, and the second screw rod is driven to move towards the proximal end; rotating the nut counter-clockwise drives the second screw to move distally and the first screw to move proximally.

Description

Adjustable bent sheath tube

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to an adjustable bent sheath tube.

Background

Medical sheaths have been widely used in minimally invasive interventional diagnostic and therapeutic procedures for creating channels, delivering or retrieving instruments, infusing drugs, or delivering body fluids. Compared with the common sheath tube, the adjustable bent sheath tube has the function of adjusting the bending of the far end, and can quickly and reliably reach the target lesion position so as to reduce the operation time. Because the internal environment is complex, the sheath tube with the sheath tube far-end multi-position or multi-direction bending adjusting function can adapt to the internal environment more than the sheath tube with the sheath tube far-end single-position or single-direction bending adjusting function, and the operation is more convenient.

Disclosure of Invention

The utility model aims at providing a sheath tube with a multi-position or multi-direction bending adjusting function at the distal end of the sheath tube. This object is achieved by:

the utility model provides an adjustable bent sheath tube, which comprises a sheath tube and a handle connected with the proximal end of the sheath tube, and is characterized in that the handle comprises: a first screw, a second screw, a nut, a first wire drawing and a second wire drawing,

the two ends of the first wire drawing are respectively connected with a first position at or near the distal end of the sheath tube and the first screw rod, the two ends of the second wire drawing are respectively connected with a second position at or near the distal end of the sheath tube and the second screw rod, the connection position of the first wire drawing and the sheath tube is different from the connection position of the second wire drawing and the sheath tube,

the first screw rod is provided with a first connecting structure, the second screw rod is provided with a second connecting structure, the first connecting structure and the second connecting structure are circumferentially matched and connected, the first connecting structure and the second connecting structure can axially and relatively move, the nut is sleeved on the first screw rod and the second screw rod, the first screw rod is provided with a first thread, the second screw rod is provided with a second thread, the directions of the first thread and the second thread are opposite, the nut is provided with thread grooves respectively matched with the first thread and the first thread,

rotating the nut clockwise drives the first screw rod to move distally and drives the second screw rod to move proximally; rotating the nut counter-clockwise drives the second screw to move distally and the first screw to move proximally.

Above-mentioned adjustable curved sheath, through setting up the first screw rod of being connected with first wire drawing, the second screw rod of being connected with the second wire drawing, wherein the nut cover is established in first screw rod and second screw rod, and through rotating the nut and adjusting first screw rod and second screw rod simultaneously and do opposite direction motion, realize that a nut controls one or more sheath distal end or be close to the position of distal end and adjust curved towards the same direction or different directions, make the handle design more simple and compact, the operation is more convenient. In addition, set up first connection structure on first screw rod, set up second connection structure on the second screw rod, first connection structure and second connection structure circumference cooperation are connected, but first connection structure and second connection structure axial motion each other can keep the relative position between first screw rod and the second screw rod between the two better, when making first screw rod and second screw rod move each other, make the sheath pipe can keep stable and controllable crooked shape through driving first wire drawing and second wire drawing.

In an embodiment, the first and second positions are at different circumferential positions.

In an embodiment, the first screw and the second screw radially surround to form a cylindrical structure, a limiting piece is arranged on the periphery of the cylindrical structure, and the nut can abut against the limiting piece.

In an embodiment, the handle further comprises a limiting tube, the first screw comprises a first limiting portion, the second screw comprises a second limiting portion, and the first limiting portion and the second limiting portion are arranged in the limiting tube so as to limit the first screw and the second screw to rotate circumferentially; and/or, a third limiting part is arranged on the outer surface of at least one of the first screw and the second screw, a fourth limiting part is arranged on the inner wall of the limiting pipe, the third limiting part and the fourth limiting part are mutually matched and connected, and the third limiting part can axially move relative to the fourth limiting part.

In an embodiment, the first limiting portion is disposed at a proximal end or a side wall of the first screw, the second limiting portion is disposed at a proximal end or a side wall of the second screw, and an outer side wall of the first limiting portion in a radial direction and an outer side wall of the second limiting portion in a radial direction respectively abut against a radial direction of an inner wall of the limiting tube and can move along an axial direction of the inner wall of the limiting tube.

In an embodiment, the first screw and the second screw radially surround a cylindrical structure, and a radial section of the cylindrical structure is circular, elliptical or polygonal.

In one embodiment, the proximal end of the first wire penetrates from the distal end of the first screw and is fixed to the middle or proximal end of the first screw, and the second wire penetrates from the distal end of the second screw and is fixed to the middle or proximal end of the second screw.

In an embodiment, a first boss is disposed on an inner wall of the first screw, a second boss is disposed on an inner wall of the second screw, a proximal end of the first wire drawing penetrates into the first boss and is fixed on the first boss, and a proximal end of the second wire drawing penetrates into the second boss and is fixed on the second boss.

In an embodiment, the first boss is provided with a first hole, the second boss is provided with a second hole, the proximal end of the first wire drawing penetrates into the first hole and is fixed by the first fixing piece, and the proximal end of the second wire drawing penetrates into the second hole and is fixed by the second fixing piece.

In one embodiment, the handle further comprises a limiting tube which limits the circumferential rotation of the first screw and the second screw,

the position of the limiting pipe corresponding to the first hole is provided with a first limiting hole, the position of the limiting pipe corresponding to the second hole is provided with a second limiting hole, the first fixing piece enters the first hole through the first limiting hole, and the second fixing piece enters the second hole through the second limiting hole.

In one embodiment, the distal end of the first screw and the distal end of the second screw each extend beyond the stopper tube, and the nut moves over the portions of the distal ends of the first screw and the second screw that extend beyond the stopper tube.

In an embodiment, the handle further comprises a slider assembly and a third wire, the slider assembly comprises a slider seat and a slider, the slider slides on the slider seat, the proximal end of the third wire is connected with the slider, and the distal end of the third wire is connected with the sheath at or near a third position of the distal end of the sheath.

In an embodiment, at least two of the first position, the second position and the third position are located at different axial positions.

In an embodiment, the handle further comprises a limiting tube, the limiting tube limits the first screw and the second screw to circumferentially rotate, and the sliding block assembly is at least partially clamped in the limiting tube.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. Wherein:

fig. 1 is a schematic view of an adjustable bend sheath according to an embodiment.

Fig. 2 is a cross-sectional view of an adjustable bend sheath according to an embodiment in an axial direction.

Fig. 3 is an exploded view of an adjustable bend sheath according to one embodiment.

Fig. 4 is a schematic structural diagram of a portion of an adjustable curved sheath according to an embodiment.

Fig. 5 is a schematic structural diagram of an adjustable curved sheath according to an embodiment.

Fig. 6 is a schematic diagram of an embodiment of a combination of a first screw 25 and a second screw 26 of an adjustable bend sheath.

Fig. 7 is an exploded view of a first screw 25 and a second screw 26 of an adjustable bend sheath according to an embodiment.

Fig. 8 is a schematic view of a combination of a first screw 25 and a second screw 26 of an adjustable bend sheath according to another embodiment.

Fig. 9 is an exploded view of a first screw 25 and a second screw 26 of an adjustable bend sheath according to another embodiment.

Fig. 10 is a schematic view of a combination of a first screw 25 and a second screw 26 of an adjustable bend sheath according to yet another embodiment.

Fig. 11 is a schematic view of another view of fig. 10.

Detailed Description

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature 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 "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

For purposes of more clarity in describing the structure of the present application, the terms "proximal" and "distal" are defined herein as terms commonly used in the interventional medical arts. Specifically, "distal" means an end far from the operator during a surgical operation, "proximal" means an end near the operator during a surgical operation, "axial" means a length direction thereof, and "radial" means a direction perpendicular to the "axial".

Referring to fig. 1, an embodiment provides an adjustable bend sheath 100, wherein the adjustable bend sheath 100 comprises a sheath 1 and a handle 2 connected to a proximal end of the sheath 1.

Referring to fig. 2, 3, 4 and 5, the handle 2 includes a first screw 25, a second screw 26, a nut 27, a first wire 31 and a second wire 32, wherein both ends of the first wire 31 are respectively connected to a first position at or near the distal end of the sheath tube 1 and the first screw 25, both ends of the second wire 32 are respectively connected to a second position at or near the distal end of the sheath tube 1 and the second screw 26, and the connection position of the first wire 31 and the sheath tube 1 is different from the connection position of the second wire 32 and the sheath tube 1. The nut 27 is sleeved on the first screw rod 25 and the second screw rod 26, the first screw rod 25 is provided with a first thread 251, the second screw rod 26 is provided with a second thread 261, the directions of the first thread 251 and the second thread 261 are opposite, and the nut 27 is provided with thread grooves respectively matched with the first thread and the first thread. Rotating the nut 27 clockwise brings the first screw 25 distally and the second screw 26 proximally; rotating the nut counter-clockwise moves the second screw 26 distally and the first screw 25 proximally.

Specifically, rotating the nut 27 clockwise causes the second screw 26 to move proximally, causing the second wire 32 to move proximally, thereby causing the second position to bend proximally; rotating the nut 27 counter-clockwise moves the first screw 25 proximally, causing the first wire 31 to move proximally, thereby causing the first position to bend proximally.

Through setting up the first screw rod 25 of being connected with first wire drawing 31, the second screw rod 26 of being connected with second wire drawing 32, wherein nut 27 cover is established in first screw rod 25 and second screw rod 26, through rotating nut 27 and adjusting first screw rod 25 and second screw rod 26 simultaneously and do opposite direction motion, realize that a nut 25 controls one or more sheath distal end or be close to the position of distal end and adjust the bending towards the same direction or different directions, make the handle design more simple compact, the operation is more convenient.

In an embodiment, the first position and the second position are located at different circumferential positions, and bending in different directions can be achieved when the first position and the second position are pulled respectively, wherein the axial positions of the first position and the second position can be the same position or any different positions. When the axial positions of the first position and the second position are different, the sheath tube can be bent at a plurality of positions.

Referring to fig. 5, 6 and 7, in an embodiment, the handle 2 further includes a limiting tube 28, the first screw 25 includes a first limiting portion 252, the second screw 26 includes a second limiting portion 262, and the first and second limiting portions 252 and 262 are disposed in the limiting tube 28, thereby limiting circumferential rotation of the first and second screws 25 and 26. The first limiting portion 252 is disposed at the proximal end of the first screw 25, the second limiting portion 262 is disposed at the proximal end of the second screw 26, and an outer sidewall 2521 of the first limiting portion 252 in a radial direction and an outer sidewall 2621 of the second limiting portion 262 in a radial direction respectively abut against a radial direction of an inner wall of the limiting tube 28 and can move along an axial direction of the inner wall of the limiting tube 28.

Referring to fig. 8 and 9, in another embodiment, the first limiting portion 252 is disposed on a side wall of the first screw 25, and the second limiting portion 262 is disposed on a side wall of the second screw 26. In the present embodiment, the length of the first stopper 252 may be a part of or the entire length of the side wall of the first screw 25; the length of the second stopper 262 may be a part or the whole of the length of the side wall of the second screw 265. The first limiting portion 252 axially passes through the first thread 251 on the side wall of the first screw 25, so that the first thread 251 has a plurality of openings, and the second limiting portion 262 axially passes through the first thread 261 on the side wall of the second screw 26, so that the second thread 261 has a plurality of openings 2611. Since the opening is small and the thread grooves on the nut 27 are consecutive, the engagement of the nut 27 with the first threads 251 and 261 is not affected when the nut 27 is turned.

Compared with the arrangement at the proximal end, the limiting part is arranged on the side wall, so that the length and the structure of the first screw rod 25 and the second screw rod 26 can be prevented from being increased, and the handle structure is simpler and more compact.

Referring to fig. 6 and 8, the first screw 25 and the second screw 26 radially surround a cylindrical structure, which may have a circular, elliptical or polygonal radial cross section. The radial section of the nut 27 matched with the first screw 25 and the second screw 26 is also round, elliptical or polygonal, so that the rotation operation is convenient.

Referring to fig. 7 and 9, in one embodiment, the proximal end of the first wire 31 penetrates from the distal end of the first screw 25 and is fixed to the middle or proximal end of the first screw 25, and the second wire 32 penetrates from the distal end of the second screw 26 and is fixed to the middle or proximal end of the second screw 26.

Further, a first boss 253 is provided on the inner wall of the first screw 25, a second boss is provided on the inner wall of the second screw 26, and the proximal end of the first wire drawing 31 penetrates the first boss 253 and is fixed on the first boss 253, and the proximal end of the second wire drawing 32 penetrates the second boss and is fixed on the second boss. The first boss 253 and the second boss can be arranged to conveniently fix the first wire drawing 31 and the second wire drawing 32, and the radial thickness of other positions of the first screw rod 25 without the first boss 253 and other positions of the second screw rod 26 without the second boss is smaller, so that the handle is lighter.

Further, the first boss 253 is provided with a first hole 254, the second boss is provided with a second hole 264, the proximal end of the first wire drawing 31 penetrates the first hole 254 and is fixed by the first fixing member 255, and the proximal end of the second wire drawing 32 penetrates the second hole 264 and is fixed by the second fixing member 265. The holes are arranged to cooperate with the fixing elements to strengthen the fixed connection between the first wire drawing 31 and the first screw 25 and between the second wire drawing 32 and the second screw 26. Specifically, the proximal end of the first wire 31 penetrates through the distal end of the first boss 253 in the axial direction, reaches the side wall of the first hole 254, then penetrates into the first hole 254, then penetrates through the first fixing member 255 in the same direction, then rotates the first fixing member 255 such that the proximal end or the portion near the proximal end of the first wire 31 is caught in the space between the first fixing member 255 and the first screw 25, and/or glue or welding may be dropped into the space, thereby achieving fixation between the first wire 31 and the first screw 25. The fixing manner between the second wire drawing 32 and the second screw 26 is the same as the fixing manner between the first wire drawing 31 and the first screw 25, and will not be described here. The first hole 254 and the second hole 264 may be in the form of blind holes in fig. 7 or through holes in fig. 9. The first and second holes 254, 264 may be provided at any position on the stopper, such as the side wall or the top, or at any other position on the first and second screws 25, 26.

Further, a guiding groove 256 is further provided on the inner wall of the first screw 25 near the distal end, so as to guide the first wire drawing 31 into the first boss 253. Similarly, a guide groove 266 may be provided on the inner wall of the second screw 26 near the distal end.

Referring again to fig. 5, the side wall of the spacing tube 28 has an opening 281, and the first screw 25 and the second screw 26 enter the spacing tube 28 through the opening 281. In one embodiment, the distal end of the first screw 25 and the distal end of the second screw 26 each extend beyond the stopper 28, and the nut 27 moves over the portions of the distal ends of the first screw 25 and the second screw 26 extending beyond the stopper 28. So set up, it is convenient that the rotation of nut 27 is not restricted and disturbed by spacing pipe 28, influences the efficiency of the rotation of nut 27. In other embodiments, the nut 27 may be disposed within the spacing tube 28.

The position of the limiting pipe 28 corresponding to the first hole 254 is provided with a first limiting hole 282, the position of the limiting pipe 28 corresponding to the second hole 264 is provided with a second limiting hole, the first fixing piece 255 enters the first hole 254 through the first limiting hole 282, and the second fixing piece 265 enters the second hole 264 through the second limiting hole. So set up, when first screw rod 25 and second screw rod 26 put into spacing pipe 28 after, when need further adjustment first wire drawing 31 and second wire drawing 32's length again, can directly adjust first mounting 255 and second mounting 265 respectively through first spacing hole 282 and second spacing hole, need not again take out the back readjustment with first screw rod 25 and second screw rod 26 from spacing pipe 28, convenient operation.

Referring to fig. 10, the first screw 25 and the second screw 26 radially surround to form a cylindrical structure, a limiting member 30 is disposed on the outer periphery of the cylindrical structure, and the nut 27 can abut against the limiting member 30. Wherein the stopper 30 comprises a first portion 301 and a second portion 302, the first portion 301 is located on the first screw 25, and the second portion 302 is located on the second screw 26. In this embodiment, the number of stoppers 30 is two, disposed at the proximal and distal ends of the barrel structure, respectively, and in other embodiments, the number of stoppers may be one or more, or the stoppers may include only one of the first portion 301 and the second portion 302. The limiting member is provided to limit the travel and distance of the movement of the nut 27 on the first screw 25 and the second screw 26, and also to prevent the nut 27 from falling off from the first screw 25 and the second screw 26 during the movement.

In an embodiment, a third limiting portion 40 is disposed on an outer surface of at least one of the first screw 25 and the second screw 26, a fourth limiting portion (not shown) is disposed on an inner wall of the limiting tube 28, the third limiting portion 40 and the fourth limiting portion are connected in a matching manner, and the third limiting portion 40 can move axially relative to the fourth limiting portion. In this embodiment, the third limiting portion 40 is a protruding portion, and the fourth limiting portion is a groove portion, and the protruding portion can slide in the groove portion, so that the first screw 25 and the second screw 26 can slide axially in the limiting tube 28 more easily, and a fixed sliding stroke is ensured. The number of the protruding parts can be one or more, and the shape can be strip-shaped, dot-shaped, block-shaped and the like.

Referring to fig. 11, the first screw 25 has a first connection structure 257, the second screw 26 has a second connection structure 267, the first connection structure 257 and the second connection structure 267 are circumferentially coupled in a mating manner, and the first connection structure 257 and the second connection structure 267 are axially movable with respect to each other. In this embodiment, the first connection structure 257 is a groove structure, and the second connection structure 267 is a bump structure, and the groove structure and the bump structure are in sliding fit connection. When the limiting tube 28 is not arranged, the relative positions of the first screw rod 25 and the second screw rod 26 are better kept, and when the first screw rod 25 and the second screw rod 26 move mutually, the sheath tube can keep a stable and controllable bending shape by driving the first wire drawing and the second wire drawing. In other embodiments, the spacing tube 28 may be provided again on this basis.

Referring again to fig. 3, in one embodiment, the handle 2 further comprises a slider assembly 29 and a third wire 33, the slider assembly 29 comprising a slider seat 292 and a slider 291, the slider 29 sliding on the slider seat 292, the proximal end of the third wire 33 being connected to the slider 291, the distal end of the third wire 33 being connected to a third location at or near the distal end of the sheath 1; and/or, the slider assembly 29 further comprises a slider screw sleeve 293, the slider screw sleeve 293 is sleeved on the slider 291, and the slider screw sleeve 293 is rotated to drive the slider 291 to move; and/or, the second knob 23 is arranged on the sliding block screw sleeve 293, so that the sliding block screw sleeve 293 can be conveniently rotated.

In the present embodiment, a slide groove 2921 is axially provided on the slider seat 292, and the slider 291 slides on the slide groove 2921. The top surface of the sliding block 291 is provided with threads, the inner wall of the sliding block screw sleeve 293 is provided with thread grooves, and the threads are matched with the thread grooves.

Referring to fig. 3 and 4, in one embodiment, the slider assembly 29 is at least partially retained within the stopper tube 28, wherein at least distal portions of the slider seat 292 and the slider screw sleeve 293 are retained within the stopper tube 28, such that the slider seat 292 and the slider screw sleeve 293 are restrained from circumferential rotation of the slider seat 292. When the slider 291 drives the third wire drawing 33 to move, a certain acting force exists, and the acting force easily causes the sheath tube 1 penetrating through the slider assembly 29 to bend, and the limiting of the limiting tube 28 can counteract the acting force, so that the sheath tube 1 penetrating through the slider assembly 29 is prevented from bending.

In this embodiment, at least two of the first position, the second position and the third position are located at different axial positions, so that the sheath tube 1 is bent at different axial positions, multi-section bending of the sheath tube 1 in the axial direction is realized, and the sheath tube is more flexible to operate.

Referring again to fig. 1, 2 and 3, in one embodiment, the handle 2 further comprises a housing 21, a first knob 22, a second knob 23 and a rear cover 24. The housing 21 is located between a first knob 22 and a second knob 23, the first knob 22 being located distally and the rear cover 24 being connected to the second knob 23.

Wherein the first knob 22 includes a knob connector 221, a knob housing 222, and a seal 223. The knob connector 221 is fixedly connected with the nut 27, the knob connector 221 is fixedly connected with the knob sleeve 222, and the sealing member 223 is arranged between the knob connector 221 and the shell 21 for fixing and sealing. The nut 27 is rotated by rotating the knob sleeve 222.

In one embodiment, the proximal end of the sheath 1 is passed first through the first and second screws 25, 26 and then through the slider seat 292. The number of the first screws 25 and the second screws 26 may be plural, the number of the slider assemblies 29 may be plural, and the two may be connected in series through the sheath 1, and the serial sequence of the two may be set according to the specific situation.

In one embodiment, for ease of assembly, the nut 27 may be split into two, forming a first nut 271 and a second nut 272. The housing 21 may be divided into two to form a first housing 211 and a second housing 212.

The limiting tube 28 is disposed in the housing 21, and the limiting tube 28 is fixed in the housing 21 by means of fastening or bonding. The slider screw sleeve 293 of the slider assembly 29 is provided in the housing 21 and may be engaged with the housing 21, and a seal may be provided between the slider screw sleeve 293 and the housing 21 to seal.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (14)

1. An adjustable bend sheath comprising a sheath and a handle connected to a proximal end of the sheath, the handle comprising: a first screw, a second screw, a nut, a first wire drawing and a second wire drawing,

the two ends of the first wire drawing are respectively connected with a first position at or near the distal end of the sheath tube and the first screw rod, the two ends of the second wire drawing are respectively connected with a second position at or near the distal end of the sheath tube and the second screw rod, the connection position of the first wire drawing and the sheath tube is different from the connection position of the second wire drawing and the sheath tube,

the first screw rod is provided with a first connecting structure, the second screw rod is provided with a second connecting structure, the first connecting structure and the second connecting structure are circumferentially matched and connected, the first connecting structure and the second connecting structure can axially and relatively move, the nut is sleeved on the first screw rod and the second screw rod, the first screw rod is provided with a first thread, the second screw rod is provided with a second thread, the directions of the first thread and the second thread are opposite, the nut is provided with thread grooves respectively matched with the first thread and the first thread,

rotating the nut clockwise drives the first screw rod to move distally and drives the second screw rod to move proximally; rotating the nut counter-clockwise drives the second screw to move distally and the first screw to move proximally.

2. The adjustable bend sheath of claim 1, wherein the first location and the second location are at different circumferential locations.

3. The adjustable bend sheath of claim 1, wherein the first screw and the second screw radially enclose a cylindrical structure, a limiting member is disposed on an outer periphery of the cylindrical structure, and the nut is capable of abutting against the limiting member.

4. The adjustable bend sheath of claim 1, wherein the handle further comprises a stop tube,

the first screw comprises a first limiting part, the second screw comprises a second limiting part, and the first limiting part and the second limiting part are arranged in the limiting pipe so as to limit the circumferential rotation of the first screw and the second screw; and/or, a third limiting part is arranged on the outer surface of at least one of the first screw and the second screw, a fourth limiting part is arranged on the inner wall of the limiting pipe, the third limiting part and the fourth limiting part are mutually matched and connected, and the third limiting part can axially move relative to the fourth limiting part.

5. The adjustable curved sheath according to claim 4, wherein the first stop portion is disposed at a proximal end or a side wall of the first screw, the second stop portion is disposed at a proximal end or a side wall of the second screw, and an outer side wall of the first stop portion in a radial direction and an outer side wall of the second stop portion in a radial direction respectively abut against an inner wall radial direction of the stop tube and are movable along an inner wall axial direction of the stop tube.

6. The adjustable bend sheath of claim 1, wherein the first screw and the second screw radially enclose a cylindrical structure having a circular, elliptical, or polygonal radial cross-section.

7. The adjustable bend sheath of claim 1, wherein the proximal end of the first strand penetrates from the distal end of the first screw and is secured to the middle or proximal end of the first screw, and the second strand penetrates from the distal end of the second screw and is secured to the middle or proximal end of the second screw.

8. The adjustable bend sheath of claim 7, wherein a first boss is disposed on an inner wall of the first screw, a second boss is disposed on an inner wall of the second screw, a proximal end of the first wire is threaded into the first boss and secured to the first boss, and a proximal end of the second wire is threaded into the second boss and secured to the second boss.

9. The adjustable bend sheath of claim 8, wherein the first boss is provided with a first aperture and the second boss is provided with a second aperture, the proximal end of the first wire is threaded into the first aperture and secured with a first securing member, and the proximal end of the second wire is threaded into the second aperture and secured with a second securing member.

10. The adjustable bend sheath of claim 9, wherein the handle further comprises a stop tube that limits circumferential rotation of the first screw and the second screw,

the position of the limiting pipe corresponding to the first hole is provided with a first limiting hole, the position of the limiting pipe corresponding to the second hole is provided with a second limiting hole, the first fixing piece enters the first hole through the first limiting hole, and the second fixing piece enters the second hole through the second limiting hole.

11. The adjustable bend sheath of claim 4, wherein the distal end of the first screw and the distal end of the second screw each extend beyond the stopper tube, the nut moving over the portions of the distal ends of the first and second screws that extend beyond the stopper tube.

12. The adjustable bend sheath of claim 1, wherein the handle further comprises a slider assembly and a third wire, the slider assembly comprising a slider seat and a slider, the slider sliding on the slider seat, a proximal end of the third wire being connected to the slider, a distal end of the third wire being connected to a third location at or near a distal end of the sheath.

13. The adjustable bend sheath of claim 12, wherein at least two of the first position, the second position, and the third position are at different axial positions.

14. The adjustable bend sheath of claim 12, wherein the handle further comprises a stop tube that limits circumferential rotation of the first screw and the second screw, the slider assembly being at least partially retained within the stop tube.

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