CN116407352A

CN116407352A - Adjustable bent sheath tube

Info

Publication number: CN116407352A
Application number: CN202111677346.1A
Authority: CN
Inventors: 王刚; 黄广念; 余文超
Original assignee: Shenzhen Jianxin Medical Technology Co ltd
Current assignee: Shenzhen Jianxin Medical Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-11

Abstract

The invention relates to the technical field of interventional medical instruments, and provides an adjustable bent sheath tube which comprises a sheath tube, a shell arranged at the proximal end of the sheath tube, a first driving mechanism, a second driving mechanism, a first traction wire, a second traction wire and a third traction wire, wherein the first driving mechanism is arranged in the shell, the proximal end of the first traction wire is connected with the first driving mechanism, the proximal ends of the second traction wire and the third traction wire are connected with the second driving mechanism, the distal ends of the three traction wires are connected with the distal end of the sheath tube, and the driving mechanism is used for pulling and releasing the traction wires connected with the driving mechanism so as to change the bending state of the sheath tube. According to the adjustable bending sheath provided by the invention, in the process of performing edge-to-edge repair operation on the mitral valve in the left atrium, the sheath can be subjected to multi-angle and multi-direction bending, namely cross-plane bending can be realized, so that the bending direction is not limited to one plane, the accurate capture of the instrument on the valve leaflet is realized, and the operation requirements of doctors and patients on complex heart internal structures are met.

Description

Adjustable bent sheath tube

Technical Field

The invention relates to the technical field of medical instruments, in particular to an adjustable bent sheath tube.

Background

Mitral valve disease is a common disorder in the elderly population, which includes two common types of mitral regurgitation and mitral stenosis, with mitral regurgitation being the most common. For moderate or severe mitral regurgitation requiring intervention treatment, the traditional surgical treatment mode is chest opening treatment, and under the support of an extracorporeal circulation machine, the heart is opened to repair or replace the valve, but the high-risk patient cannot tolerate the valve. In recent years, the high-risk patients with mitral regurgitation are hoped for by interventional therapy, which is generally performed by delivering an instrument to a lesion through a sheath tube to repair or replace the valve.

In the process of performing edge-to-edge repair operation on the mitral valve in the left atrium, the sheath tube needs to be bent in multiple angles and multiple directions so as to realize accurate capture of the instrument on the valve leaflet. However, the current bending-adjustable sheath tube is generally one-way bending-adjustable or two-way bending-adjustable, the bending-adjustable direction is always in one plane, the cross-plane bending-adjustable cannot be realized, and compared with the complex heart internal structure, the current bending-adjustable sheath tube can not meet the requirements of doctors and patients, and has larger limitation.

Disclosure of Invention

Based on the above, the invention provides an adjustable curved sheath tube, which solves the problems that the adjustable curved sheath tube in the prior market cannot realize cross-plane curved adjustment, and compared with a complex heart internal structure, the adjustable curved sheath tube can not meet the requirements of doctors and patients, and has larger limitation.

The invention provides an adjustable bent sheath tube, which comprises a sheath tube, a shell arranged at the proximal end of the sheath tube, a first driving mechanism, a second driving mechanism, a first traction wire, a second traction wire and a third traction wire, wherein the first driving mechanism, the second driving mechanism, the first traction wire and the third traction wire are arranged in the shell, the proximal end of the first traction wire is connected with the first driving mechanism, the proximal end of the second traction wire and the proximal end of the third traction wire are connected with the second driving mechanism, the distal ends of the first traction wire, the second traction wire and the third traction wire are connected with the distal end of the sheath tube, and the first driving mechanism and the second driving mechanism are respectively used for pulling and releasing the traction wires connected with the first traction wire and the second traction wire so as to change the bending state of the sheath tube.

In one embodiment, the first drive mechanism includes a first drive ring partially exposed from the housing, the second drive mechanism includes a second drive ring partially exposed from the housing, the first drive ring is proximal to the distal end of the housing, the second drive ring is proximal to the proximal end of the housing, and the proximal end of the first traction wire, the proximal end of the second traction wire, and the proximal end of the third traction wire are all located between the distal end of the first drive ring and the proximal end of the second drive ring.

In one embodiment, the distal end of the first traction wire, the distal end of the second traction wire, and the distal end of the third traction wire are located at different positions of the same circumference of the same radial plane of the distal end of the sheath.

In one embodiment, the adjustable curved sheath tube further comprises a rotating mechanism connected with the sheath tube, the first driving mechanism and the second driving mechanism, and the rotating mechanism can drive the sheath tube, the first driving mechanism and the second driving mechanism to coaxially rotate relative to the shell.

In one embodiment, the rotating mechanism comprises a rotating member, a fixing frame, an inner sheath reinforcing tube and two inner sheath guide rods, wherein the sheath tube passes through the inner sheath reinforcing tube and is fixedly connected with the inner sheath reinforcing tube, the inner sheath reinforcing tube and the inner sheath guide rods are connected with the rotating member, the inner sheath reinforcing tube passes through the first driving mechanism and is connected with the second driving mechanism, the inner sheath guide rod passes through the first driving mechanism and the fixing frame, and the second driving mechanism is arranged on the fixing frame; the rotating piece drives the sheath tube to coaxially rotate relative to the shell through the inner sheath reinforcing tube under the action of external force, and drives the first driving mechanism and the second driving mechanism to coaxially rotate relative to the shell through the inner sheath guide rod.

In one embodiment, the first driving mechanism comprises a first driving part and a first sliding block linked with the first driving part, the first sliding block is connected with the proximal end of the first traction wire, and the first sliding block is sleeved on the inner sheath reinforcing tube; the first sliding block can move along the inner sheath reinforcing tube under the drive of the first driving piece, so that the first sliding block can pull and release the first traction wire.

In one embodiment, the first slider is sleeved on the two inner sheath guide rods, the rotating member rotates relative to the housing under the action of external force and drives the sheath tube to coaxially rotate through the inner sheath reinforcing tube, and drives the first slider and the first driving member to coaxially rotate through the inner sheath guide rods.

In one embodiment, the outer surface of the first slider is provided with threads, the first driving member is a sleeve with threads on the inner surface, the first slider is arranged in the sleeve and is in threaded connection with the sleeve, and the first slider moves along the axial direction of the sleeve when the sleeve rotates.

In one embodiment, the second driving mechanism comprises a second driving part and two second sliding blocks which are in transmission with the second driving part, and the proximal ends of the second traction wire and the third traction wire are respectively connected with the two second sliding blocks; and the two second sliding blocks are driven by the second driving piece to reversely move, so that when one second sliding block pulls the traction wire connected with the second sliding block, the other second sliding block synchronously releases the traction wire connected with the second sliding block.

In one embodiment, the two second sliding blocks are respectively sleeved on the two screw rods, the second sliding blocks are in threaded connection with the screw rods, the two screw rods penetrate through the fixing frame, the second driving part is driven by the two screw rods and the two second sliding blocks, the two inner sheath guide rods are correspondingly connected with the fixing frame through the two screw rods, and the two second sliding blocks are respectively sleeved on the two inner sheath guide rods to limit the second sliding blocks to generate circumferential deflection on the corresponding screw rods; the second driving piece moves relative to the shell under the action of external force and drives the two screws to rotate, and the two second sliding blocks do reverse movement; the rotating piece rotates relative to the shell under the action of external force and drives the sheath tube to coaxially rotate through the inner sheath reinforcing tube, and drives the fixing frame to rotate through the inner sheath guide rod, so that the second driving piece, the two screws and the corresponding second sliding block are driven to coaxially rotate.

In one embodiment, the second sliding block is in threaded connection with the screw rod and can realize self-locking.

In one embodiment, the housing is provided with a perspective window.

In one embodiment, a first damping member is fixedly disposed on the housing, and the first damping member abuts against the rotating member to prevent the rotating member from rotating during bending adjustment.

In one embodiment, the inner sheath reinforcement tube passes through the second driving member along the axial direction of the second driving member, a second damping member is sleeved on the inner sheath reinforcement tube, and the second damping member abuts against the second driving member.

In one embodiment, a limiting groove is formed in the outer peripheral side of the inner sheath reinforcing tube, a limiting plate is arranged at a position, corresponding to the limiting groove, of the shell, and the limiting plate is matched with the limiting groove to axially limit the inner sheath reinforcing tube.

Compared with the prior art, the adjustable curved sheath pipe provided by the invention has the following beneficial effects:

according to the adjustable bending sheath tube, the first driving mechanism is connected with the first traction wire so as to realize unidirectional bending of the sheath tube, the second driving mechanism is connected with the second traction wire and the third traction wire so as to realize bidirectional bending of the sheath tube, so that the sheath tube can bend towards three different directions, in the process of performing edge-to-edge repair operation on the mitral valve in the left atrium, bending can be firstly performed by any driving mechanism to select a proper angle of a plane, then bending can be performed by the other driving mechanism, or bending can be performed by the first driving mechanism and the second driving mechanism at the same time, so that the sheath tube can perform multi-angle and multi-direction bending, namely cross-plane bending can be realized, the bending direction is not limited to be in one plane, accurate capture of the instrument on the valve leaflet is realized, and the operation requirement of doctors and patients on complex heart internal structures is met. In addition, through the adjustable bent sheath provided by the invention, a single doctor can independently realize the cross-plane bending adjustment of the sheath in the edge-to-edge repair operation process, so that doctor resources are released, and meanwhile, the convenience of operation is improved.

Drawings

Fig. 1 is a schematic perspective view of an adjustable curved sheath according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a portion of an exploded view of an adjustable bend sheath according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an adjustable bend sheath according to an embodiment of the present invention;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic diagram showing an internal structure of an adjustable curved sheath according to a first embodiment of the present invention;

FIG. 6 is an enlarged view of B in FIG. 5;

FIG. 7 is a schematic view showing a combination of a sheath tube and a pulling wire of an adjustable curved sheath tube according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an internal structure of an adjustable curved sheath according to a first embodiment of the present invention;

FIG. 9 is a schematic diagram of an internal structure of an adjustable curved sheath according to an embodiment of the present invention;

FIG. 10 is an enlarged view of C in FIG. 9;

FIG. 11 is a schematic front view of an adjustable curved sheath according to an embodiment of the present invention;

FIG. 12 is an enlarged view of D of FIG. 2;

fig. 13 is a schematic diagram of an internal structure of an adjustable curved sheath according to a second embodiment of the present invention;

fig. 14 is an enlarged view of E in fig. 13;

fig. 15 is a schematic view illustrating an internal structure of an adjustable curved sheath according to a third embodiment of the present invention;

FIG. 16 is a schematic view showing the internal structure of an adjustable curved sheath according to a fourth embodiment of the present invention;

Fig. 17 is a schematic diagram of an internal structure of an adjustable curved sheath according to a fifth embodiment of the present invention.

The attached drawings are used for identifying and describing:

10. an adjustable curved sheath; 11. a housing; 12. a sheath; 13. a driving mechanism; 14. traction wire; 15. a rotation mechanism;

101. a hose; 102. a three-way valve; 111. a perspective window; 112. a limiting plate; 131. a first driving mechanism; 132. a second driving mechanism; 141. a first traction wire; 142. a second traction wire; 143. a third traction wire; 151. a rotating member; 152. a fixing frame; 153. an inner sheath reinforcement tube; 154. an inner sheath guide rod;

1311. a first driving member; 1312. a first slider; 1313. a first drive ring; 1321. a second driving member; 1322. a second slider; 1323. a screw; 1324. a second drive ring; 1511. a first damping member; 1512. an annular groove; 1531. a second damping member; 1532. a limit groove;

15111. a damping ring; 15112. damping block.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment. It should be noted that, in this embodiment, terms of left, right, up, down, etc. are merely relative concepts or references to normal use states of the product, and should not be construed as limiting.

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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body or a delivery system for delivering the medical device, which is closer to an operator, is generally referred to as a "proximal end", the end farther from the operator is referred to as a "distal end", and the "proximal end" and the "distal end" of any component of the medical device or the delivery system are defined according to this principle. "axial" generally refers to the longitudinal direction of a medical device when delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines the "axial" and "radial" directions of any component of the medical device in accordance with this principle.

Example 1

Referring to fig. 1 and 2, an embodiment of the present invention provides an adjustable curved sheath 10, where the adjustable curved sheath 10 includes a housing 11, a sheath 12, at least one driving mechanism 13 and at least one traction wire 14, where the housing 11 is disposed at a proximal end of the sheath 12, and the driving mechanism 13 is disposed in the housing 11. The distal end of the traction wire 14 is connected with the distal end of the sheath tube 12, the proximal end of the traction wire 14 stretches into the housing 11 and is connected with the driving mechanism 13, the driving mechanism 13 is used for pulling and releasing the traction wire 14 to bend the sheath tube 12, the driving mechanism 13 moves relative to the housing 11 under the action of external force, and the moving driving mechanism 13 changes the bending state of the sheath tube 12 in the process of pulling and releasing the traction wire 14.

Specifically, the housing 11 is used for convenient holding during operation, the housing 11 can provide a protection function and an installation support function for the driving mechanism 13 and other components, and the housing 11 can be formed by butting an upper housing and a lower housing. Further, a plurality of reinforcing ribs (not shown) may be provided in the inner wall of the housing 11, and the provision of the reinforcing ribs may enhance the strength of the housing 11 and also provide mounting support functions for the components in the housing 11.

Specifically, the pull wire 14 may be connected to the distal end of the sheath 12 by an anchor ring (not shown), i.e., the anchor ring is fixed to the distal end of the sheath 12, and the distal end of the pull wire 14 is connected to the anchor ring.

Specifically, a threading channel (not shown) is provided in the side wall of the sheath tube 12 for threading the traction wire 14, so that a special moving channel can be provided for the traction wire 14, smooth movement of the traction wire is ensured, and meanwhile, protection can be provided for the traction wire to avoid external interference.

Further, the adjustable bend sheath 10 further includes a hose 101 and a three-way valve 102, the three-way valve 102 being in communication with the sheath 12 via the hose 101, such that fluid may be injected into the sheath 12 or body fluid may be withdrawn by connecting the three-way valve 102 via a syringe or other device.

When the number of the traction wires 14 is 1, the sheath 12 can realize unidirectional bending adjustment, and when the number of the traction wires 14 is greater than 1, the sheath 12 can realize multidirectional bending adjustment.

Referring to fig. 2-7, as a specific embodiment, two driving mechanisms 13 are provided, three traction wires 14 are provided, wherein one traction wire 14 is connected with one driving mechanism 13, the other two traction wires 14 are connected with the other driving mechanism 13, and the two driving mechanisms 13 move relative to the housing 11 under the action of external force and respectively pull and release the traction wires 14 connected with the two driving mechanisms to change the bending state of the sheath 12. The present invention is described by taking the example that the driving mechanism 13 is provided with two and the traction wire 14 is provided with three, and the present invention should not be limited to this configuration. In the embodiment of the present invention, the driving mechanism 13 includes the first driving mechanism 131 and the second driving mechanism 132, and preferably, the first driving mechanism 131 and the second driving mechanism 132 are controlled independently of each other. The traction wire 14 comprises a first traction wire 141, a second traction wire 142 and a third traction wire 143, wherein the proximal end of the first traction wire 141 is connected with the first driving mechanism 131, the proximal ends of the second traction wire 142 and the third traction wire 143 are connected with the second driving mechanism 132, and the distal ends of the first traction wire 141, the second traction wire 142 and the third traction wire 143 are connected with the distal end of the sheath 12. The first drive mechanism 131 is movable relative to the housing 11 and pulls and releases the first pull wire 141, and the second drive mechanism 132 is movable relative to the housing 11 and pulls and releases the second and

third pull wires

142 and 143 so that the sheath 12 can bend in three different directions.

Preferably, the distal ends of the first, second and

third pull wires

141, 142 and 143 are located at different positions on the same circumference of the same radial plane of the distal end of the sheath 12, and closer to the distal end point of the sheath 12. In the process of performing the edge-to-edge repair operation on the mitral valve, the tricuspid valve or the aortic valve by adopting the instrument for clamping the valve leaflets, because the valve leaflets are moving, the delay of the bending of the sheath tube 12 can be reduced by locating the distal ends of the first traction wire 141, the second traction wire 142 and the third traction wire 143 at different positions on the same circumference of the same radial plane of the distal end of the sheath tube 12, so that the sheath tube 12 is more accurate in bending, and the accurate capture of the valve leaflets in the process of releasing the instrument for clamping the valve leaflets from the adjustable bent sheath tube is realized. Of course, the distal ends of the first, second and

third pull wires

141, 142, 143 lie in different radial planes of the distal end of the sheath 12, such as one radial plane of the distal end of the sheath 12 for the distal end of the first pull wire 141, and the other radial plane of the distal end of the sheath 12 for the distal end of the second and

third pull wires

142, 143. Alternatively, the distal ends of the first, second and

third pull wires

141, 142 and 143, respectively, lie in different radial planes of the distal end of the sheath 12. The embodiment of the present invention is not particularly limited.

According to the adjustable bending sheath tube 10 provided by the invention, the first driving mechanism 131 is connected with the first traction wire 141 so as to realize unidirectional bending of the sheath tube 12, the second driving mechanism 132 is connected with the second traction wire 142 and the third traction wire 143 so as to realize bidirectional bending of the sheath tube 12, so that the sheath tube 12 can bend towards three different directions, in the process of performing edge-to-edge repair operation on the mitral valve in the left atrium, the proper angle of a plane can be selected by bending through any driving mechanism, and then bending is performed through another driving mechanism, or bending is performed in multiple angles and multiple directions through the first driving mechanism 131 and the second driving mechanism 132 at the same time, so that the sheath tube 12 can perform multi-angle multi-direction bending, namely, cross-plane bending can be realized, the bending direction is not limited to be in one plane, thereby realizing accurate capturing of the valve leaflet by instruments, and meeting the operation requirements of doctors and patients on complex heart internal structures. In addition, through the adjustable bent sheath tube 10 provided by the invention, a single doctor can independently realize the cross-plane bending of the sheath tube 12 in the edge-to-edge repair operation process, so that doctor resources are released, and meanwhile, the convenience of operation is improved.

Specifically, as shown in fig. 7, the distal ends of the traction wires corresponding to the first driving mechanism 131 and the distal ends of the traction wires corresponding to the second driving mechanism 132 are connected to mutually perpendicular axial planes of the distal end of the sheath 12.

Specifically, as shown in fig. 7, the distal ends of the second traction wire 142 and the third traction wire 143 are connected in the same radial plane of the distal end of the sheath 12 and symmetrically arranged, and when the second driving mechanism 132 moves relative to the housing 11 under the action of an external force and pulls any one of the second traction wire 142 and the third traction wire 143, the other one can be released synchronously, so as to change the bending state of the sheath 12.

It will be appreciated that the second driving mechanism 132 may pull and release the second traction wire 142 and the third traction wire 143, when the second driving mechanism 132 pulls any one of the second traction wire 142 and the third traction wire 143, the sheath 12 bends toward the side of the pulled traction wire, and at the same time, the second driving mechanism 132 simultaneously makes the other non-pulled traction wire release correspondingly along with the bending of the sheath 12, for example, when the second driving mechanism 132 pulls the second traction wire 142 to bend the distal end of the sheath 12 toward the side where the second traction wire 142 is located, the third traction wire 143 releases along with the bending of the sheath 12; when the second driving mechanism 132 pulls the third pulling wire 143 and drives the sheath 12 to bend towards the side where the third pulling wire 143 is located, the second pulling wire 142 releases the length along with the bending of the sheath 12, so that the sheath 12 can bend in two directions by the mutual matching of the second driving mechanism 132, the second pulling wire 142 and the third pulling wire 143, and thus, the two-way bending can be realized, the requirement of interventional therapy on complex lesion positions such as vascular torsion and variable vascular opening positions is fully met, the frequency of adjusting and replacing catheters for a plurality of times by clinical operators is greatly reduced, the operation is easier, and the risk of complications is reduced.

Referring to fig. 2 and 8, further, the adjustable curved sheath 10 further includes a rotation mechanism 15, at least part of the rotation mechanism 15 extends into the housing 11, and the rotation mechanism 15 can rotate relative to the housing 11, and the rotation mechanism 15 extending into the housing 11 is connected with the sheath 12, the first driving mechanism 131 and the second driving mechanism 132, so that the sheath 12, the first driving mechanism 131 and the second driving mechanism 132 can simultaneously coaxially rotate relative to the housing 11 under the driving of the rotation mechanism 15, that is, the rotation mechanism 15 rotates relative to the housing 11 under the action of an external force and simultaneously drives the sheath 12, the first driving mechanism 131 and the second driving mechanism 132 to coaxially rotate relative to the housing 11.

According to the adjustable bent sheath provided by the invention, the rotating mechanism 15 is connected with the sheath 12, the first driving mechanism 131 and the second driving mechanism 132, so that the rotating mechanism 15 rotates relative to the shell 11 under the action of external force and simultaneously drives the sheath 12, the first driving mechanism 131 and the second driving mechanism 132 to coaxially rotate relative to the shell 11, and therefore, when the sheath 12 rotates in the operation process of complex pathological changes of vascular torsion, especially when the mitral valve is subjected to edge-to-edge repair operation by the left atrium, the handle is not required to be detached from the support frame, and then the whole handle instrument rotates, the rotation of the sheath 12 can be realized by adjusting the rotating mechanism 15, the operation time is shortened, and the probability of complications of patients is reduced. In addition, since the sheath 12 rotates simultaneously and coaxially with the first drive mechanism 131 and the second drive mechanism 132, the twisting or the wire jamming of the pulling wire 14 caused by the asynchronous rotation of the sheath 12 and the first drive mechanism 131 or/and the second drive mechanism 132 when the rotation of the sheath 12 is required can be avoided.

Referring to fig. 2 and 8, as an embodiment of the rotation mechanism 15, the rotation mechanism 15 includes a rotation member 151, a fixing frame 152, an inner sheath reinforcement tube 153, and two inner sheath guide rods 154. The inner sheath reinforcement tube 153 is disposed between the two inner sheath guide rods 154. The inner sheath reinforcement tube 153 and the inner sheath guide rod 154 are disposed within the housing 11. The sheath tube 12 passes through the inner sheath reinforcement tube 153 and is fixedly connected to the inner sheath reinforcement tube 153. The inner sheath reinforcement tube 153 and the inner sheath guide rod 154 are connected to the rotating member 151, and the inner sheath reinforcement tube 153 passes through the first driving mechanism 131 and is connected to the second driving mechanism 132. The inner sheath guide rod 154 passes through the first driving mechanism 131 and the fixing frame 152, the second driving mechanism 132 is arranged on the fixing frame 152, the rotating member 151 rotates relative to the housing 11 under the action of external force, and simultaneously, the inner sheath reinforcing tube 153 is used as a rotating shaft, the inner sheath reinforcing tube 153 drives the sheath tube 12 to coaxially rotate relative to the housing 11, and the inner sheath guide rod 154 drives the first driving mechanism 131 and the second driving mechanism 132 to coaxially rotate relative to the housing 11.

Specifically, the sheath tube 12 and the inner sheath reinforcement tube 153 may be fixed with medical glue.

Specifically, the rotating member 151 and the inner sheath reinforcement tube 153 may be connected by a clamping manner, and the rotating member 151 and the inner sheath guide rod 154 may be connected by a clamping manner.

Alternatively, the rotating member 151 may be a knob or a rotating ring, and embodiments of the present invention are not particularly limited. Alternatively, the rotating member 151 may be disposed at a proximal end position of the housing 11, may be disposed at a distal end position of the housing 11, and may be disposed inside the housing 11 and exposed to the housing 11, i.e., disposed between the first driving mechanism 131 and the second driving mechanism 132, so long as the sheath 12, the first driving mechanism 131 and the second driving mechanism 132 keep coaxial rotation when the rotating member 151 is rotated, which is not particularly limited in the embodiment of the present invention.

According to the adjustable bent sheath tube 10 provided by the invention, the sheath tube 12 is fixedly connected with the inner sheath reinforcing tube 153, the inner sheath guide rod 154 penetrates through the first driving mechanism 131, meanwhile, the inner sheath reinforcing tube 153 and the inner sheath guide rod 154 are both connected with the rotating piece 151, when the rotating piece 151 is rotated, the inner sheath reinforcing tube 153 rotates relative to the shell 11 by the central axis of the inner sheath reinforcing tube 153 and drives the sheath tube 12 to rotate, meanwhile, the two inner sheath guide rods 154 rotate relative to the shell 11 by taking the inner sheath reinforcing tube 153 as a rotating shaft and drive the first driving mechanism 131 to rotate relative to the shell 11 by taking the inner sheath reinforcing tube 153 as the rotating shaft, and because the second driving mechanism 132 is arranged on the fixing frame 152, the inner sheath guide rod 154 penetrates through the fixing frame 152, at this time, the inner sheath guide rod 154 drives the fixing frame 152 to rotate relative to the shell 11 by taking the inner sheath reinforcing tube 153 as the rotating shaft, and further drives the second driving mechanism 132 to rotate relative to the shell 11 by taking the inner sheath reinforcing tube 153 as the rotating shaft, when the rotating piece 151 rotates relative to the shell 11 under the action of external force, the sheath tube 12, the first driving mechanism 131 and the second driving mechanism 132 keep rotating simultaneously and coaxially relative to the shell 11, and the rotation of the sheath tube 12 and the first driving mechanism 131 and the second driving mechanism 132 can be prevented from being clamped with the first driving mechanism 132 or the second driving mechanism 132 or the wire when the sheath tube 12 is required to rotate, or the first driving mechanism and the second driving mechanism is not clamped or the wire or the driving mechanism is rotated.

Further, as an embodiment, the rotary member 151 is sleeved with a first damping member 1511, and the first damping member 1511 abuts against the housing 11. As another embodiment, a first damper 1511 is fixed to the housing 11, and the first damper 1511 abuts against the rotary member 151. The first damping member 1511 may be silica gel or rubber. When the sheath 12 is bent, the larger the bending angle is, the larger the straightening force is, and the larger the required operation force is, and due to the linkage between the driving mechanism 13 and the rotation mechanism 15, the rotation member 151 is easily linked when the straightening force is large to a certain extent, and the rotation member 151 is rotated when bending is performed. Therefore, the present invention can prevent the rotation member 151 from rotating during bending by providing the first damping member 1511, thereby affecting the operation of the doctor.

Specifically, the first damping member 1511 includes a damping ring 15111 and a damping block 15112, the rotary member 151 is provided with an annular groove 1512, the damping ring 15111 is sleeved on the annular groove 1512, the rotary member 151 penetrates through the damping block 15112, the damping ring 15111 abuts against the damping block 15112, and the damping block 15112 and the housing 11 remain stationary.

With continued reference to fig. 2, 5 and 6, as an embodiment of the first driving mechanism 131, the first driving mechanism 131 includes a first driving member 1311 and a first slider 1312 coupled to the first driving member 1311, the first slider 1312 is connected to a proximal end of the first traction wire 141, and the first slider 1312 is sleeved on the inner sheath reinforcement tube 153. The first driving member 1311 moves relative to the housing 11 under the action of an external force and drives the first slider 1312 to move on the inner sheath reinforcement tube 153, so that the first slider 1312 pulls and releases the first pulling wire 141, thereby changing the bending state of the sheath tube 12.

Specifically, the first slider 1312 is sleeved on the two inner sheath guide rods 154, the rotating member 151 rotates relative to the housing 11 under the action of an external force and drives the sheath 12 to coaxially rotate relative to the housing 11 through the inner sheath reinforcing tube 153, and the first slider 1312 and the first driving member 1311 are driven to coaxially rotate relative to the housing 11 through the inner sheath guide rods 154. By sleeving the first slide block 1312 on the two inner sheath guide rods 154, when the rotating piece 151 rotates, the first slide block 1312 can coaxially rotate along with the rotating piece 151 so as to drive the first driving piece 1311 to rotate together, and automatic bending of the sheath 12 caused by axial displacement of the first slide block 1312 and the first driving piece 1311 when the sheath 12 rotates is avoided.

As a specific embodiment, the outer surface of the first sliding block 1312 is provided with threads, the first driving member 1311 is a sleeve with threads on the inner surface, the first sliding block 1312 is disposed in the sleeve and is in threaded connection with the sleeve, and the first sliding block 1312 moves along the axial direction of the sleeve when the sleeve rotates. By arranging the first slider 1312 in the sleeve and screwing it to the sleeve, the space utilization in the housing 11 can be improved without affecting the unidirectional bending of the sheath 12. The first slider 1312 is in threaded connection with the sleeve and can realize self-locking, that is, the first driving mechanism 131 has self-locking capability, so that the sheath tube 12 is prevented from automatically straightening, and the effect of stopping immediately after the hand is loosened is achieved. In addition, no additional locking structure is needed, so that complicated operation of secondary locking is reduced, the operation efficiency is improved, and the risk of complications is reduced.

Further, in order to facilitate the unidirectional bending of the bending-adjustable sheath tube 10, a first driving ring 1313 may be sleeved on the outer peripheral side of the first driving member 1311, and the first driving ring 1313 is at least partially exposed to the housing 11 and keeps rotating synchronously with the sleeve. Specifically, as an embodiment, a limiting protrusion (not shown) may be disposed on an outer peripheral side of the sleeve, and a limiting groove (not shown) is disposed at a position of the inner peripheral side of the first driving ring 1313 corresponding to the limiting protrusion, where the limiting protrusion is clamped in the limiting groove when the first driving ring 1313 is sleeved on the outer peripheral side of the first driving member 1311. As another embodiment, the limiting protruding strip may be disposed on the inner peripheral side of the first driving ring 1313, and the limiting groove may be disposed on the outer peripheral side of the sleeve, so long as it is satisfied that the limiting protruding strip is retained in the limiting groove when the first driving ring 1313 is sleeved on the outer peripheral side of the first driving member 1311.

Referring to fig. 2, 9 and 10, as an embodiment of the second driving mechanism 132, the second driving mechanism 132 includes a second driving member 1321, two second sliders 1322 that are driven by the second driving member 1321, and proximal ends of the second traction wire 142 and the third traction wire 143 are respectively connected to the two second sliders 1322; the second driving member 1321 moves relative to the housing 11 under the action of an external force and drives the two second sliding blocks 1322 to move reversely, so that when one second sliding block 1322 pulls the pulling wire connected with the second sliding block 1322, the other second sliding block 1322 synchronously releases the pulling wire connected with the second sliding block, and further the sheath 12 changes its bending state in a radial plane.

As a specific embodiment, the second driving mechanism 132 further includes two screws 1323 corresponding to the two second sliding blocks 1322, the two second sliding blocks 1322 are respectively sleeved on the two screws 1323, the second sliding blocks 1322 are in threaded connection with the screws 1323, the second driving member 1321 is in driving connection with the two second sliding blocks 1322 through the two screws 1323, wherein the two screws 1323 are respectively arranged at two opposite sides of the second driving member 1321 and are in driving connection with the second driving member 1321 through gears, when the second driving member 1321 rotates, the rotation directions of the two screws 1323 are the same, the threads on the two screws 1323 are opposite, the second sliding blocks 1322 sleeved on the screws 1323 move along the axial direction of the corresponding screws 1323, that is, when the second driving member 1321 moves relative to the housing 11 under the action of an external force and drives the two screws 1323 to rotate, the two second sliding blocks 1322 do reverse movement, so that when one second sliding block 1322 pulls a traction wire connected with the other second sliding block 1322 pulls the traction wire synchronously, and the traction wire connected with the other second sliding block 1322 is released. The transmission mode of the second driving part 1321, the two screws 1323 and the two second sliding blocks 1322 ensures that the whole second driving mechanism 132 is more stable in structure and more balanced in force transmission, so that the synchronism of the second traction wire 142 and the third traction wire 143 in traction and release is better. Meanwhile, compared with the existing driving mechanisms such as pulling and releasing the pulling wire by the rotary disc type structure, the second driving mechanism 132 also has a larger stroke, so that the selection range of the bending angle of the sheath tube 12 is wider.

Specifically, the two screws 1323 are disposed on the fixing frame 152 in a penetrating manner, the two inner sheath guide rods 154 are connected with the fixing frame 152 corresponding to the two screws 1323, the two second sliding blocks 1322 are respectively sleeved on the two inner sheath guide rods 154 to limit the second sliding blocks 1322 to generate circumferential deflection on the corresponding screws 1323, firstly, the second sliding blocks 1322 can be limited, and only axial movement of the second sliding blocks 1322 on the corresponding screws 1323 is ensured, so that phenomena of kinking and clamping of a traction wire, inaccurate bending adjustment of the sheath tube 12 and the like are avoided, and secondly, when the rotating member 151 rotates relative to the shell 11 under the action of external force, the sheath tube 13212, the second driving member 1321, the two screws 1323 and the corresponding second sliding blocks 1322 simultaneously perform integral coaxial rotation relative to the shell 11.

Specifically, the second slider 1322 is in threaded connection with the screw 1323 and can realize self-locking, so that when the two-way bending adjustment of the bending-adjustable sheath tube 10 is performed, the second driving mechanism 132 has self-locking capability, and the sheath tube 12 is prevented from automatically straightening back, so that the effect of stopping immediately after the hand is loosened is achieved. In addition, no additional locking structure is needed, so that complicated operation of secondary locking is reduced, the operation efficiency is improved, and the risk of complications is reduced.

Further, in order to facilitate the bidirectional bending of the bending-adjustable sheath 10, a second driving ring 1324 may be sleeved on the outer peripheral side of the second driving member 1321, and the second driving ring 1324 is at least partially exposed to the housing 11 and keeps rotating synchronously with the second driving member 1321. Specifically, as an embodiment, a limiting protrusion (not shown) may be disposed on the outer peripheral side of the second driving member 1321, and a limiting groove (not shown) is disposed on the inner peripheral side of the second driving ring 1324 corresponding to the position of the limiting protrusion, where the limiting protrusion is clamped when the second driving ring 1324 is sleeved on the outer peripheral side of the second driving member 1321. As another embodiment, the limiting protruding strip may be disposed on the inner peripheral side of the second driving ring 1324, and the limiting groove may be disposed on the outer peripheral side of the sleeve, so long as the requirement that the limiting protruding strip is clamped in the limiting groove when the second driving ring 1324 is sleeved on the outer peripheral side of the second driving member 1321 is satisfied.

Further, the inner sheath reinforcement tube 153 passes through the second driving member 1321 along the axial direction of the second driving member 1321, the inner sheath reinforcement tube 153 is sleeved with a second damping member 1531, and the second damping member 1531 abuts against the second driving member 1321. The second damping member 1531 may be silica gel or rubber. Through setting up second damping member 1531, can guarantee that second driving member 1321 carries out the transmission to two screw rods 1323 when carrying out two-way accent bending, can make second driving member 1321 when not carrying out accent bending keep static with interior sheath reinforcement pipe 153 again, also has further strengthened the self-locking ability of second actuating mechanism 132 promptly. In addition, when rotating the rotating member 151, the rotating member 151 drives the two screws 1323 and the two second sliders 1322 to integrally coaxially rotate through the inner sheath guide rod 154 and the fixing frame 152, and then drives the second driving member 1321 to synchronously rotate through the cooperation of the two screws 1323 and the second driving member 1321, and the second damping member 1531 exists, so that the rotating member 151 can also drive the second driving member 1321 to synchronously rotate through the inner sheath reinforcing tube 153 when driving the sheath tube 12 to rotate through the inner sheath reinforcing tube 153, thereby improving the overall synchronism when rotating the sheath tube 12, and enabling the operation to be more labor-saving when rotating the sheath tube 12.

Referring to fig. 9-11, further, perspective windows 111 are provided at positions of the housing 11 corresponding to the two second sliders 1322, and the perspective windows 111 enable a doctor to perform initial calibration before performing an operation, that is, to ensure that the initial states of the two second sliders 1322 are aligned in the middle, so that the sheath 12 is more accurate when performing bidirectional bending during the operation. Meanwhile, due to the fact that the sheath 12 has delay in the straightening process, whether the sheath 12 is in the right position or not can be accurately observed through the perspective window 111, and misoperation of a doctor is reduced.

With continued reference to fig. 6, 10 and 11, specifically, the first drive ring 1313 is proximal to the distal end of the housing 11, the second drive ring 1324 is proximal to the proximal end of the housing 11, and the proximal ends of the first, second and

third pull wires

141, 142 and 143 are located between the distal end of the first drive ring 1313 and the proximal end of the second drive ring 1324. The second driving mechanism 132 controls bidirectional bending, the structure is complex, the first driving mechanism 131 controls unidirectional bending, the structure is simple, the design can enable the inside of the adjustable bending sheath 10 to be more compact, the space utilization rate of the adjustable bending sheath 10 is improved, the center of gravity of the adjustable bending sheath 10 tends to be in the middle position, and when the adjustable bending sheath 10 is fixed on a support, unbalance at two ends of the adjustable bending sheath 10 is avoided.

Referring to fig. 2 and 12, further, a limiting groove 1532 is formed on the outer peripheral side of the inner sheath reinforcement tube 153, a limiting plate 112 is disposed at a position of the housing 11 corresponding to the limiting groove 1532, and the limiting plate 112 cooperates with the limiting groove 1532 to axially limit the inner sheath reinforcement tube 153. Of course, the limiting groove 1532 may be formed on the inner wall of the housing 11, and the limiting plate 112 may be disposed on the outer circumferential side of the inner sheath reinforcement tube 153, which is not particularly limited in the embodiment of the present invention, as long as the limiting plate 112 and the limiting groove 1532 cooperate to axially limit the inner sheath reinforcement tube 153. When the sheath tube 12 is bent, the bending angle is larger, the straightening force is larger, the sheath tube 12 has acting force for pulling the inner sheath reinforcing tube 153, the inner sheath reinforcing tube 153 penetrates through the inside of the adjustable bending sheath tube 10, when the sheath tube 12 pulls the inner sheath reinforcing tube 153, the assembly clearance of components of the adjustable bending sheath tube 10 is easy to change, the assembly clearance of the components is too large, the assembly clearance of the components is easy to cause, the use of the adjustable bending sheath tube 10 is further influenced, the friction force between the components is easy to be increased due to too small clearance, the operation of the adjustable bending sheath tube 10 is more laborious, and the limiting plate 112 and the limiting groove 1532 are matched to axially limit the inner sheath reinforcing tube 153, so that the acting force of the inner sheath reinforcing tube 153 pulled by the sheath tube 12 is concentrated, and the assembly clearance of the components of the adjustable bending sheath tube 10 is kept unchanged.

In summary, according to the adjustable curved sheath 10 provided by the present invention, the first driving mechanism 131 and the second driving mechanism 132 are independent from each other, so that the unidirectional curve adjustment and the bidirectional curve adjustment of the adjustable curved sheath 10 do not interfere with each other. When the unidirectional bending is performed, an operator rotates the first driving ring 1313 along a direction to drive the first driving member 1311 to rotate, and then drives the first slider 1312 to move on the inner sheath reinforcement tube 153, so that the first slider 1312 pulls the first traction wire 141 to bend the sheath tube 12, and when the sheath tube 12 needs to be straightened back, the operator rotates the first driving ring 1313 along an opposite direction to drive the first driving member 1311 to rotate reversely, and then drives the first slider 1312 to move reversely on the inner sheath reinforcement tube 153, so that the first slider 1312 releases the first traction wire 141 to straighten the sheath tube 12. When the two-way bending adjustment is performed, an operator rotates the second driving member 1321 along a direction by rotating the second driving ring 1324, so as to drive the two screws 1323 to rotate, the second sliders 1322 sleeved on the screws 1323 move along opposite directions along the axial direction of the corresponding screws 1323, so that when one second slider 1322 pulls the pulling wire connected with the second slider 1322, the other second slider 1322 synchronously releases the pulling wire connected with the second slider, so that the sheath 12 bends towards the side where the pulling wire is pulled, and when the sheath 12 needs to be straightened, the operator rotates the second driving member 1321 along the opposite directions by rotating the second driving ring 1324, the two screws 1323 rotate in opposite directions, and the movement directions of the two second sliders 1322 are opposite to the original direction, so that the originally pulled pulling wire is released, and the originally released pulling wire is pulled, so that the sheath 12 returns towards the side where the pulling wire is pulled. When the cross-plane bending adjustment is needed, a proper angle of a plane can be selected for bending through one of the first driving mechanism 131 and the second driving mechanism 132, and then bending is adjusted through the other one, or the first driving mechanism 131 and the second driving mechanism 132 are used for bending simultaneously, so that the bending adjustment direction is not limited to one plane, the device is suitable for more complex operations, and the operation requirements of doctors and patients on complex heart internal structures are met. In addition, since the first damping member 1511 is provided, the sheath 12 can be prevented from automatically rotating when the sheath 12 is bent, thereby affecting the operation of the doctor.

When the sheath 12 needs to be rotated, the operator rotates the rotating member 151 to drive the inner sheath reinforcement tube 153 and the inner sheath guide rod 154 to rotate, wherein the inner sheath guide rod 154 drives the first slider 1312 to rotate and then drives the first driving member 1311 to rotate, and the inner sheath guide rod 154 drives the second slider 1322 and the screw 1323 to rotate and then drives the second driving member 1321 to rotate, at the same time, the inner sheath reinforcement tube 153 drives the sheath 12 to rotate and drives the second driving member 1321 to rotate through the cooperation of the second damping member 1531, so that the overall synchronism in rotating the sheath 12 is improved, and the operation is more labor-saving when rotating the sheath 12. In addition, the rotation and bending of the sheath 12 are independent of each other, that is, the rotation and bending of the sheath 12 are not in the same working space interface, and whether the bending is performed after the rotation or the bending is performed after the bending, the original operation interface of the bendable sheath 10 can be kept unchanged, so that the risk of misoperation of a doctor is avoided from increasing due to the operation interface.

Example two

Referring to fig. 13 and 14, the same or similar points as those of the first embodiment will not be described herein, and the main difference between them is that in the adjustable curved sheath 10 of the second embodiment, as an alternative embodiment of the second driving mechanism 132, the second driving mechanism 132 may also be configured in a manner of directly driving the second driving member 1321 and the second slider 1322. Specifically, in the present embodiment, the second driving mechanism 132 does not include a screw 1323, two second sliding blocks 1322 are respectively sleeved on the two inner sheath guide rods 154, the second sliding blocks 1322 are in threaded transmission with the second driving member 1321, and the threaded directions of the two second sliding blocks 1322 are opposite. Wherein the inner sheath guide 154 may be a non-circular guide to prevent the second slider 1322 from deflecting circumferentially on the inner sheath guide 154. When the second driving member 1321 rotates, the second sliding blocks 1322 move along the axial direction of the corresponding inner sheath guide rod 154, and the moving directions of the two second sliding blocks 1322 are opposite, that is, the second driving member 1321 moves relative to the housing 11 under the action of an external force and drives the two second sliding blocks 1322 to move reversely, so that when one second sliding block 1322 pulls the traction wire connected with the second sliding block 1322, the other second sliding block 1322 synchronously releases the traction wire connected with the second sliding block 1322.

Example III

Referring to fig. 15, the same or similar features as those of the third embodiment are not described herein, and the main difference between them is that the driving mechanism 13 in the third embodiment is provided with one driving mechanism, the traction wire 14 is provided with one driving mechanism, the proximal end of the traction wire 14 is connected to the driving mechanism 13, the distal ends are connected to the distal end of the sheath 12, and the driving mechanism 13 can move relative to the housing 11 and pull and release the traction wire 14 to change the bending state of the sheath 12.

The sheath 12 of the embodiment of the invention can realize unidirectional bending adjustment, and reduces the frequency of adjusting and replacing the catheter for a plurality of times by clinical operators, thereby facilitating the operation and reducing the risk of complications.

Example IV

Referring to fig. 16, the same or similar features as those of the fourth embodiment are not described herein, and the main difference between them is that the driving mechanism 13 in the fourth embodiment is provided with one driving mechanism and two driving wires 14, wherein the proximal ends of the two driving wires 14 are connected to the driving mechanism 13, the distal ends are connected to the distal end of the sheath 12, and the driving mechanism 13 can move relative to the housing 11 and pull and release the two driving wires 14 to change the bending state of the sheath 12. Specifically, the distal ends of the two pull wires 14 are connected in the same radial plane as the distal end of the sheath 12 and are symmetrically disposed.

The sheath 12 of the embodiment of the invention can realize the bending adjustment in two opposite directions, thereby fully meeting the requirement of interventional therapy on complex lesion positions such as vascular distortion, variable vascular opening positions and the like, greatly reducing the frequency of adjusting the catheter and replacing the catheter for a plurality of times by clinical operators, further facilitating the operation of the operation and reducing the risk of complications.

Example five

Referring to fig. 17, the fifth embodiment is the same as or similar to the first embodiment, and the main difference between them is that there are two driving mechanisms 13 and two traction wires 14 in the fifth embodiment, where the traction wires 14 are connected to the driving mechanisms 13 in a one-to-one correspondence, and the two driving mechanisms 13 can move relative to the housing 11 and respectively pull and release the traction wires 14 connected thereto to change the bending state of the sheath 12.

Specifically, the proximal end of one traction wire 14 is connected to one driving mechanism 13, the distal end is connected to the distal end of the sheath 12, the proximal end of the other traction wire 14 is connected to the other driving mechanism 13, the distal end is connected to the distal end of the sheath 12, and the positions where the two traction wires 14 are connected to the sheath 12 are different. Preferably, the distal ends of the two pull wires 14 are connected at different locations within the same radial plane of the distal end of the sheath 12.

The sheath 12 of the embodiment of the invention can realize the bending adjustment in two different directions, and the two bending adjustment processes are independently controlled and do not affect each other, thereby fully meeting the requirement of interventional therapy on complex lesion positions such as vascular twisting, vascular opening position changeability and the like, greatly reducing the frequency of adjusting the catheter and replacing the catheter for clinical operators, facilitating the operation of the operation and reducing the risk of complications.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An adjustable curved sheath tube, which is characterized in that: the novel sheath tube comprises a sheath tube body, a shell body arranged at the proximal end of the sheath tube body, a first driving mechanism, a second driving mechanism, a first traction wire, a second traction wire and a third traction wire, wherein the first driving mechanism and the second driving mechanism are arranged in the shell body, the proximal end of the first traction wire is connected with the first driving mechanism, the proximal end of the second traction wire and the proximal end of the third traction wire are connected with the second driving mechanism, the distal ends of the first traction wire, the second traction wire and the third traction wire are connected with the distal end of the sheath tube body, and the first driving mechanism and the second driving mechanism are respectively used for pulling and releasing the traction wires connected with the first driving mechanism so as to change the bending state of the sheath tube body.

2. The adjustable bend sheath of claim 1, wherein: the adjustable bent sheath tube further comprises a rotating mechanism connected with the sheath tube, the first driving mechanism and the second driving mechanism, and the rotating mechanism can drive the sheath tube, the first driving mechanism and the second driving mechanism to coaxially rotate relative to the shell.

3. The adjustable bend sheath of claim 2, wherein: the rotating mechanism comprises a rotating piece, a fixing frame, an inner sheath reinforcing pipe and two inner sheath guide rods, wherein the sheath pipe penetrates through the inner sheath reinforcing pipe and is fixedly connected with the inner sheath reinforcing pipe, the inner sheath reinforcing pipe and the inner sheath guide rods are connected with the rotating piece, the inner sheath reinforcing pipe penetrates through the first driving mechanism and is connected with the second driving mechanism, the inner sheath guide rods penetrate through the first driving mechanism and the fixing frame, and the second driving mechanism is arranged on the fixing frame;

The rotating piece drives the sheath tube to coaxially rotate relative to the shell through the inner sheath reinforcing tube under the action of external force, and drives the first driving mechanism and the second driving mechanism to coaxially rotate relative to the shell through the inner sheath guide rod.

4. An adjustable bend sheath according to claim 3, wherein: the first driving mechanism comprises a first driving part and a first sliding block linked with the first driving part, the first sliding block is connected with the proximal end of the first traction wire, and the first sliding block is sleeved on the inner sheath reinforcing tube; the first sliding block can move along the inner sheath reinforcing tube under the drive of the first driving piece, so that the first sliding block can pull and release the first traction wire.

5. The adjustable bend sheath of claim 4, wherein: the first sliding block is sleeved on the two inner sheath guide rods, and the rotating piece rotates relative to the shell under the action of external force and drives the sheath tube to coaxially rotate through the inner sheath reinforcing tube, and drives the first sliding block and the first driving piece to coaxially rotate through the inner sheath guide rods.

6. The adjustable bend sheath of claim 4, wherein: the first slider surface is equipped with the screw thread, first driving piece is the sleeve that the internal surface was equipped with the screw thread, first slider is arranged in the sleeve and with sleeve threaded connection, the sleeve rotates the time first slider is followed the axial motion of sleeve.

7. An adjustable bend sheath according to claim 3, wherein: the second driving mechanism comprises a second driving part and two second sliding blocks which are in transmission with the second driving part, and the proximal ends of the second traction wire and the third traction wire are respectively connected with the two second sliding blocks; and the two second sliding blocks are driven by the second driving piece to reversely move, so that when one second sliding block pulls the traction wire connected with the second sliding block, the other second sliding block synchronously releases the traction wire connected with the second sliding block.

8. The adjustable bend sheath of claim 7, wherein: the two second sliding blocks are respectively sleeved on the two screw rods, the second sliding blocks are in threaded connection with the screw rods, the two screw rods penetrate through the fixing frame, the second driving piece is in transmission with the two second sliding blocks through the two screw rods, the two inner sheath guide rods are correspondingly connected with the fixing frame, and the two second sliding blocks are respectively sleeved on the two inner sheath guide rods to limit the second sliding blocks to generate circumferential deflection on the corresponding screw rods;

the second driving piece moves relative to the shell under the action of external force and drives the two screws to rotate, and the two second sliding blocks do reverse movement; the rotating piece rotates relative to the shell under the action of external force and drives the sheath tube to coaxially rotate through the inner sheath reinforcing tube, and drives the fixing frame to rotate through the inner sheath guide rod, so that the second driving piece, the two screws and the corresponding second sliding block are driven to coaxially rotate.

9. The adjustable bend sheath of claim 8, wherein: the second sliding block is in threaded connection with the screw rod and can realize self-locking.

10. The adjustable bend sheath of claim 1, wherein: the shell is provided with a perspective window.

11. An adjustable bend sheath according to any one of claims 3, wherein: the shell is fixedly provided with a first damping piece, and the first damping piece is abutted against the rotating piece to prevent the rotating piece from rotating during bending adjustment.

12. The adjustable bend sheath of claim 7, wherein: the inner sheath reinforcing pipe penetrates through the second driving part along the axial direction of the second driving part, a second damping part is sleeved on the inner sheath reinforcing pipe, and the second damping part abuts against the second driving part.

13. An adjustable bend sheath according to any one of claims 3, wherein: the limiting groove is formed in the outer peripheral side of the inner sheath reinforcing tube, a limiting plate is arranged at the position, corresponding to the limiting groove, of the shell, and the limiting plate is matched with the limiting groove to axially limit the inner sheath reinforcing tube.

14. The adjustable bend sheath of claim 1, wherein: the first drive mechanism comprises a first drive ring partially exposed from the housing, the second drive mechanism comprises a second drive ring partially exposed from the housing, the first drive ring is near the distal end of the housing, the second drive ring is near the proximal end of the housing, and the proximal end of the first traction wire, the proximal end of the second traction wire and the proximal end of the third traction wire are all located between the distal end of the first drive ring and the proximal end of the second drive ring.

15. The adjustable bend sheath of claim 1, wherein: the distal end of the first traction wire, the distal end of the second traction wire, and the distal end of the third traction wire are located at different positions of the same circumference of the same radial plane of the distal end of the sheath.