CN115999014A - Adjustable bent sheath handle - Google Patents

Abstract

The application discloses an adjustable bent sheath handle, which comprises a traction wire, a sheath tube body, a main branch tube and a side branch tube; the side branch pipe includes: the fixing mechanism is used for fixing the traction wire in the side branch pipe; the moving mechanism and the fixing mechanism form a spiral pair and are used for regulating and controlling the relative position of the fixing mechanism in the side branch pipe so as to realize the regulation of the length of the traction wire in the sheath pipe body and control the curvature of the adjustable bending section of the sheath pipe body. According to the embodiment of the application, based on the spiral pair structure, the traction wire is driven to do linear motion through rotation operation, the bending angle of the adjustable bending section of the sheath tube body is controlled, the tip end of the sheath tube points to the target position, and the operation of a bending path in interventional operation is facilitated; the reverse rotation operation screw pair can realize the reverse linear motion of the traction wire, the traction wire tension is released to realize the far-end straight-head state of the tube body, the structure transmission of the screw pair is used for enabling the whole process to be simple in operation and accurately controlling the bending angle of the far-end sheath tube according to the rotation angle, and the damage to the wall of the blood vessel is reduced or even avoided.

Description

Adjustable bent sheath handle

Technical Field

The application relates to the technical field of medical instrument products, in particular to an adjustable curved sheath handle.

Background

The adjustable curved sheath is generally used to establish a channel between a lesion site in a patient and an external operating end so as to introduce or remove medical instruments, medicines, body fluids and the like, thereby avoiding the use of surgical operations. It is known that the device or drug must be delivered to the lesion via the channel of the sheath. In the clinical operation processes of biopsy sampling, bacteriology, cytology examination and the like of a lesion site by utilizing a respiratory endoscope, a sheath tube (catheter) is often used as a channel, so that the lesion site is conveniently reached. The position adjustment of the sheath is very difficult, and the operation requirements for the doctor are extremely high, and it is also difficult to stably maintain the sheath at the current position after the position adjustment is completed. Therefore, how to provide an adjustable bent sheath adjusting handle and an adjustable bent sheath system which can prevent traction wires from twisting or breaking due to stress and are accurate in positioning is a problem to be solved.

Disclosure of Invention

In order to solve the technical problem, the embodiment of the application provides an adjustable bending sheath handle which controls the movement of a traction wire in a side branch pipe based on a spiral pair principle so as to control the bending amplitude of a distal sheath pipe.

The adjustable bent sheath handle comprises a traction wire, a sheath tube body, a main branch tube and a side branch tube; one end of the traction wire is arranged in the side branch pipe, and the other end of the traction wire sequentially penetrates through the main branch pipe and the sheath pipe body and is fixed at the distal end of the adjustable bending section of the sheath pipe body; the side branch pipe includes:

the fixing mechanism is positioned in the side branch pipe and is used for fixedly arranging the traction wire;

and the moving mechanism is used for regulating and controlling the relative position of the fixing mechanism in the side branch pipe so as to realize the adjustment of the length of the traction wire in the sheath pipe body and control the curvature of the adjustable bending section of the sheath pipe body.

Further, the moving mechanism is used for regulating and controlling the fixing mechanism to move forwards and backwards along the axial direction of the side branch pipe in the side branch pipe.

Further, the moving mechanism regulates and controls the position of the fixing mechanism in the side branch pipe in a screwing mode.

Further, a spiral pair principle is utilized between the moving mechanism and the fixed mechanism to realize small-range bending adjustment.

Further, the moving mechanism includes:

the screwing part and the fixing mechanism form a screw pair; the side branch pipe is internally provided with a clamping structure which is used for clamping the screwing part so that the screwing part rotates only along the axial direction of the side branch pipe; the part of the screwing part is positioned outside the side branch pipe and is manually screwed by an operator to realize the adjustment of the axial position of the fixing mechanism in the side branch pipe.

Further, the front end of the screwing part takes the screw as a main part, and the rear end of the screwing part extends out of the side branch pipe shell in the form of a nut to be used as a force application part of an operator.

Further, the fixing mechanism is sleeved outside the screwing part, and the traction wire is positioned in the fixing mechanism to realize that the traction wire is positioned in an eccentric position in the side branch pipe.

Further, the moving mechanism further includes:

and the limiting part is positioned in the handle shell of the side branch pipe, is matched with the fixing mechanism to prevent the fixing mechanism from rotating in the radial direction, and realizes that the fixing mechanism only moves forwards and backwards along the axial direction of the side branch pipe.

Further, a slide rail is arranged on the inner side of the side branch pipe shell to serve as a limiting part.

Further, the fixed establishment includes the lock accuse slider, and the inner face and the screw rod intermeshing of lock accuse slider, and the outside is equipped with the arch, matches with the slide rail so that whole lockhole slider can only do axial displacement along the side branch pipe along the slide rail.

Further, two protrusions are arranged on the lock control sliding block, when the lock control sliding block is in contact with the sliding rail, the sliding rail limits the lock control sliding block to rotationally move, and the lock control sliding block can only axially move along the side branch pipe of the sliding rail.

Further, a screw limiting clamping groove is formed in one side, close to the main branch pipe, of the sliding rail, and a guide wire positioning pin is arranged on the lower side of the screw limiting clamping groove so as to control the position of the traction wire in the main branch pipe; the screw limiting clamping groove is used for enabling the screw to rotate with the whole side branch pipe only, relative displacement in the axial direction is not generated, and further the screwing part can only rotate in the radial direction but cannot move in the axial direction.

Further, the moving mechanism includes:

the screwing part and the fixing mechanism form a screw pair; the screw part is positioned outside the side branch pipe and is manually screwed by an operator to realize the axial position of the screw part in the side branch pipe.

Further, the fixing mechanism and the screwing part move synchronously along the axial direction to adjust the length of the traction wire in the sheath tube body, so that the bending degree of the adjustable bending section of the sheath tube body is controlled.

Further, the screwing part is formed by fixing a sleeve and a screw, the whole sleeve is wrapped outside the handle shell, and an anti-slip boss can be arranged outside the sleeve to improve the operation hand feeling of an operator.

Further, screw rod and shell threaded connection, screw rod and sleeve fixed connection, bearing and screw rod hole welding, the handle shell inboard is equipped with the screw thread, and screw thread axial downside is equipped with the seal wire locating pin, and the traction wire passes through the position in order to control entering side branch pipe locating pin, is restricted to the side branch pipe both sides removal, avoids the winding of traction wire.

Further, a ball bearing is arranged between the fixing mechanism and the screwing part to buffer friction between the fixing mechanism and the screwing part, so that the traction wire forms hysteresis motion, the movement of the traction wire in the straight line direction of the side branch pipe is delayed, and the traction wire is prevented from being broken in a twist shape.

Further, the fixing mechanism and the screwing part form a gear pair, and the rotation of the screwing part drives the fixing mechanism to rotate slowly, so that the traction wire forms a hysteresis motion, the movement of the traction wire only along the straight line direction of the side branch pipe is delayed, and the traction wire is prevented from being broken in a twist shape.

Further, the whole screw rod adopts a hollow structure, the front end is hollow and narrower, the rear end is wider for placing the fixing mechanism, an end cover is arranged at the rear end of the screw rod and positioned between the sleeve and the screw rod, a bulge is arranged on the side surface of the end cover, the end cover is embedded into a groove formed in the inner wall of the screw rod so as to realize that the end cover and the screw rod move together in the axial direction, and meanwhile, a cavity formed between the end cover and the screw rod can limit the fixing mechanism and move together in the axial direction.

According to the embodiment of the application, based on the spiral pair structure, the traction wire is driven to do linear motion through rotation operation, the softness angle of the sheath body with the adjustable bending section is controlled, after the distal end of the sheath is bent, the tip of the sheath can point to the target position, and the operation of a bending path in interventional operation is facilitated; the reverse rotation operation can realize the reverse linear motion of the traction wire, the traction wire tension is released to realize the far-end straight-head state of the tube body, the structure transmission of the screw pair enables the whole process to be simple in operation and accurately control the bending angle of the far-end sheath tube according to the rotation angle, and the damage to the vessel wall is reduced or even avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of an adjustable curved sheath provided in a first embodiment of the present application;

FIG. 2 is a cross-sectional view of a handle provided in a first embodiment of the present application;

FIG. 3 is an enlarged partial view of area A of FIG. 2;

FIG. 4 is an expanded view of the handle provided in the first embodiment of the present application;

FIG. 5 is a view of a handle housing provided in a first embodiment of the present application;

FIG. 6 is a traction wire installation diagram provided by the first embodiment of the present application;

FIG. 7 is a mounting view of a slide rail provided in a first embodiment of the present application;

FIG. 8 is a block diagram of an adjustable curved sheath provided in a second embodiment of the present application;

FIG. 9 is an expanded view of a handle provided in a second embodiment of the present application;

FIG. 10 is a cross-sectional view of a handle provided in a second embodiment of the present application;

FIG. 11 is a view of a handle housing provided in a second embodiment of the present application;

FIG. 12 is a traction wire installation diagram provided by a second embodiment of the present application;

FIG. 13 is a collar view provided by a second embodiment of the present application;

FIG. 14 is a diagram of an end cap provided by a second embodiment of the present application;

FIG. 15 is a screw diagram provided by a second embodiment of the present application;

fig. 16 is a sleeve diagram provided in a second embodiment of the present application.

Meaning of reference numerals in the drawings:

100-side branch pipe, 300-main branch pipe, 301-guide wire locating pin, 400-sheath pipe body, 500-adjustable bend section, 101-traction wire, 102-locking slide block, 103-handle shell, 104-screw, 105-slide block protrusion, 106-slide rail, 107-screw limit clamping groove, 108-screw cap, 109-groove, 110-first groove, 111-second groove, 112-third groove, 113-buckle, 201-collar, 202-ball bearing, 203-fixed pin, 204-end cover, 205-sleeve.

Detailed Description

In order to make the application objects, features and advantages of the present application more obvious and understandable, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The invention is further elucidated below in connection with the drawings and the specific embodiments.

In the description of the present application, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The utility model relates to an adjustable curved sheath handle mainly includes traction wire 101, sheath body 400, main branch 300 and side branch, and the same with current scheme, traction wire 101 one end is located in the side branch 100, and the other end passes main branch 300 and sheath body 400 in proper order after the distal end at the adjustable curved section 500 of sheath body 400 is fixed, and side branch 100 intersects with sheath body 400 axis.

The side branch pipe 100 of the application comprises a fixing mechanism and a moving mechanism, wherein the fixing mechanism is used for fixing the traction wire 101 inside the side branch pipe 100, and the moving mechanism is used for adjusting and controlling the relative position of the fixing mechanism in the side branch pipe 100 so as to adjust the bending degree of the adjustable bending section 500 of the sheath pipe body 400.

Considering the transmission structure and the bending adjusting range, the bending adjusting in a small range is realized by utilizing the spiral pair principle, and the bending adjusting in a small range is a relatively accurate and controllable mode. The position adjustment of the fixing mechanism by the moving mechanism is divided into two types, one is that the fixing mechanism moves in the side branch pipe 100 due to the relative displacement of the two types, and the other is that the fixing mechanism moves in the side branch pipe 100 due to the synchronous movement of the two types.

As a specific embodiment, the first mode is adopted in this embodiment, that is, the fixing mechanism moves solely in the side branch pipe, and as shown in fig. 1, the screwing part and the fixing mechanism form a screw pair.

The fixing mechanism is sleeved outside the screwing part, and the traction wire 101 is positioned in the fixing mechanism to be in an eccentric position in the side branch pipe 100. The fixing mechanism comprises a lock control slide block 102 and a slide rail 106, one surface of the lock control slide block 102 is meshed with the screw 104, and the other surface is provided with a slide block protrusion 105 which is matched with the slide rail 106, so that the whole lock control slide block 102 can only axially move along the side branch pipe 100 along the slide rail 106. Of course, the positions of the sliding rail 106 and the sliding block protrusion 105 can be exchanged, and still the limiting effect can be realized.

As shown in fig. 2-4, a sliding rail 106 is arranged at the inner side of the shell of the side branch pipe 100, a screw limiting clamping groove 107 is arranged at one side of the sliding rail 106 close to the main branch pipe 300, and a guide wire positioning pin 301 is arranged at the lower side of the screw limiting clamping groove 107 so as to control the position of the traction wire 101 in the main branch pipe 300.

As shown in fig. 5, the handle housing 103 is divided into two parts, and the handle housing is spliced into a whole by means of the buckle 113.

As shown in fig. 6, the front end of the screw portion is mainly formed of a screw 104, and the rear end thereof is formed of a nut 108, which protrudes outside the housing of the side branch pipe 100 as a portion to which the operator applies force. The side branch pipe 100 is internally provided with the screw limiting clamping groove 107, so that the screw 104 and the whole side branch pipe 100 can only realize the rotation of the screw 104, and no relative displacement in the axial direction is generated.

In the scheme, the screw pair relationship of the screwing part and the fixing mechanism is not replaceable, the traction wire 101 is fixed at the edge area by the fixing mechanism, under the cooperation of the sliding rail 106 and the sliding block protrusion 105, the whole traction wire 101 and the locking sliding block 102 can only do translational motion along the axial direction of the side branch pipe 100, the traction wire 101 can not generate any rotation in the motion process, and the risk of breakage caused by autorotation into a twist shape does not exist. If the screw pair relationship between the screwing part and the fixing mechanism is replaced once, the traction wire 101 is fixed in the screw 104, the screw 104 lacks a limiting structure for axial movement, and further the traction wire 101 can rotate in the moving process, and once the twist-shaped knot is formed, the traction wire is likely to break in the using process.

Specifically, as shown in fig. 7, a nut 108 is fixedly connected to a screw 104, the screw 104 is in threaded connection with the lock control slider 102, three grooves are formed in one side of the lock control slider 102, a traction wire 101 passing through a guide wire positioning pin 301 penetrates into and out of the lower end of a second groove 111, penetrates into and out of the lower end of a first groove 110, penetrates into and out of the lower end of a third groove 112, penetrates into and out of the upper end of the third groove 112, is similar to a knotting manner, the upper end of the third groove 112 and the traction wire 101 are fixed by glue or welding, two slider protrusions 105 are arranged on the lock control slider 102, when the lock control slider 102 is in contact with a sliding rail 106, the sliding rail 106 limits the rotation movement of the lock control slider 102, and the lock control slider 102 can only move axially along the side branch pipe 100 of the sliding rail 106.

During specific movement, the screw limiting clamping groove 107 is positioned below the screw 104, the screw 104 is limited to move up and down, the nut 108 is twisted, the nut 108 can only drive the screw 104 to rotate along the side branch pipe 100, the length of the side branch pipe 100 in the handle mechanism is not changed, and the operation is simple; the screw 104 and the lock control sliding block 102 are self-locked to drive the lock control sliding block 102 to move up and down, the sliding rail 106 limits the rotation of the lock control sliding block 102, the lock control sliding block 102 moves up and down along with the screw 104 when the nut 108 rotates, the adjustable bending section 500 is bent to a certain angle, the angle is fixed by thread self-locking, the unlocking angle can be unlocked by slightly rotating the bolt, and the lock control sliding block can be freely switched between the locking state and the unlocking state, and the lock control sliding block is accurately positioned.

The handle of the adjustable bending catheter sheath in the embodiment has simple structural design and is convenient for doctors to operate. The clinician may operate the handle mechanism nut 108 to rotate in a counter-clockwise direction and push distally and proximally to reach the lesion. In a specific implementation process, the sheath tube 400 is pushed into the body, and an operator rotates clockwise according to the nut 108 at the end part of the handle, so that the sliding block drives the traction wire 101 to do linear motion through the screw 104, the angle control of the softness of the sheath tube body of the adjustable bending section 500 is realized, after the distal end of the sheath tube is bent, the tip of the sheath tube can point to the target position, and the surgical operation of a bending path in an interventional operation is facilitated. The sheath tube 400 is retracted, the operator rotates the handle nut 108 anticlockwise to enable the sliding block to linearly move in the opposite direction, and the pulling force of the pulling wire 101 is released, so that the distal straight-head state of the tube can be realized. The whole process is simple to operate, the bending angle is accurately controlled, and the damage to the blood vessel wall is avoided.

As a specific embodiment, the second mode is adopted in this embodiment, that is, the fixing mechanism moves in the side branch pipe 100 together with the moving mechanism, and as shown in fig. 8, the screwing part moves together with the fixing mechanism, and the screwing part and the side branch pipe 100 casing form a screw pair.

As shown in fig. 9-10, the side branch 100 includes a handle housing 103, a traction wire 101, a collar 201, a screw 104, a ball bearing 202, a fixed pin 203, an end cap 204, and a sleeve 205.

The sleeve 205 and the screw 104 are fixed to form a screwing part, the whole sleeve 205 is wrapped outside the handle housing 103, and an anti-slip boss can be arranged outside the sleeve 205 to improve the operation hand feeling of an operator. Screw 104 is connected with the shell screw thread, screw 104 and sleeve 205 fixed connection, and the bearing is welded with screw 104 hole, and handle shell 103 inboard is equipped with the screw thread, and the screw thread axial downside (be located the intersection of side branch pipe 100 and main branch pipe 300) is equipped with guide wire locating pin 301, and the traction wire 101 passes through guide wire locating pin 301 location in order to control the position of getting into in the side branch pipe 100, is restricted to the both sides removal of side branch pipe 100, avoids the winding of traction wire 101.

A collar 201 is provided between the sleeve 205 and the housing to reduce the contact surface of the entire sleeve 205 with the exterior of the housing during forced rotation, thereby reducing friction.

As shown in fig. 6-7, the ball bearing 202 and the fixing pin 203 form a fixing mechanism, the center of the fixing pin 203 is provided with three grooves, the traction wire 101 penetrates into the second groove 111 from the lower end and penetrates out from the upper end, penetrates into the first groove 110 from the lower end, penetrates out from the lower end and penetrates out from the upper end of the third groove 112, and the upper end of the third groove 112 and the traction wire 101 are fixed by glue or welding so as to realize the fixation of the traction wire 101.

Compared with the scheme of one traction wire adopted in the scheme, the scheme of two traction wires can also be adopted in the same way, the two sides in the fixing pin 203 are respectively fixed with the traction wires 101, the distal ends of the two wires are respectively fixed with the two sides of the distal end of the adjustable bending section 500 of the sheath tube body 400, and the bending in different directions is respectively regulated and controlled. The present direction allows for bi-directional controlled bending as the sleeve 205 is threaded, and different directions of bending of different distal adjustable bending segments 500 are achieved with different directions of threading.

The whole screw 104 adopts a hollow structure, the front end is hollow and narrower, the rear end is wider for placing the fixing mechanism, an end cover 204 is arranged at the rear end of the screw 104, the end cover 204 is positioned between the sleeve 205 and the screw 104, the side surface of the end cover 204 is provided with a bulge, the bulge is embedded into a groove formed in the inner wall of the screw 104 so as to realize that the end cover 204 and the screw 104 move together in the axial direction, and meanwhile, a cavity formed between the end cover 204 and the screw 104 can limit the fixing mechanism and move together in the axial direction.

During specific movement, as the rolling bearing is welded on the screw 104, along with the up-and-down rotation of the screw 104, the fixing pin 203 is sleeved in the bearing inner hole, and the positioning pin drives the traction wire 101 to move in a lagging way through the friction buffer function of the ball bearing 202, so that the traction wire 101 almost only moves along the straight line direction of the side branch pipe 100, the situation that the traction wire 101 is prevented from being broken in a twist shape is ensured (on one hand, the existence of the ball bearing 202 greatly delays the rotation of the traction wire 101 in the radial direction, on the other hand, the actual sizes of the handle and the traction wire are considered, the moving distance in the radial direction is very small, a twist shape is difficult to form under the handle and the traction wire, the traction wire 101 is not easy to bend, and breakage is avoided. When the sleeve 205 is rotated, the screw 104 is connected with the shell screw 104 to drive the fixing pin 203 to rotate up and down, so that the adjustable bending section 500 is bent to a certain angle, the angle is fixed by self-locking of threads, the sleeve 205 can be slightly rotated to unlock the angle, and the sleeve can be freely switched between a locking state and an unlocking state, and is accurately positioned.

The bendable catheter sheath handle of the embodiment has simple structural design and is convenient for doctors to operate. The clinician may operate the handle mechanism sleeve 205 to rotate in a counter-clockwise direction and push distally and proximally to reach the lesion site. In a specific implementation process, the sheath tube 400 is pushed into the body, and an operator rotates clockwise according to the handle sleeve 205, so that the fixing pin 203 drives the traction wire 101 to do linear motion through the screw 104, angle control of softness of the sheath tube of the adjustable bending section 500 is achieved, after the distal end of the sheath tube is bent, the tip of the sheath tube can point to a target position, and surgical operation of a bending path in interventional surgery is facilitated. The sheath tube 400 is retracted, the operator rotates the handle sleeve 205 anticlockwise to enable the fixing pin 203 to linearly move in the opposite direction, and the pulling force of the pulling wire 101 is released, so that the distal straight-head state of the tube can be realized. The whole process is simple to operate, the bending angle is accurately controlled, and the damage to the blood vessel wall is avoided.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes (such as number, shape, position, etc.) may be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and these equivalent changes all belong to the protection of the present invention.

Claims (8)

1. An adjustable bent sheath handle comprises a traction wire, a sheath tube body, a main branch tube and a side branch tube; one end of the traction wire is arranged in the side branch pipe, and the other end of the traction wire sequentially penetrates through the main branch pipe and the sheath pipe body and is fixed at the distal end of the adjustable bending section of the sheath pipe body; the method is characterized in that:

the side branch pipe includes:

the fixing mechanism is positioned in the side branch pipe and is used for fixedly arranging the traction wire;

and the moving mechanism is used for regulating and controlling the relative position of the fixing mechanism in the side branch pipe so as to regulate the length of the traction wire in the sheath pipe body and realize the control of the bending degree of the adjustable bending section of the sheath pipe body.

2. The adjustable curved sheath handle according to claim 1, wherein,

the moving mechanism is used for regulating and controlling the fixing mechanism to move back and forth in the side branch pipe along the axial direction of the side branch pipe.

3. An adjustable curved sheath handle according to claim 1 or 2, wherein,

the moving mechanism regulates and controls the position of the fixing mechanism in the side branch pipe in a screwing mode.

4. The adjustable curved sheath handle according to claim 3, wherein said movement mechanism comprises:

the screwing part and the fixing mechanism form a screw pair; the side branch pipe is internally provided with a clamping structure which is used for clamping the screwing part so that the screwing part rotates only along the axial direction of the side branch pipe; the part of the screwing part is positioned outside the side branch pipe and is manually screwed by an operator to realize the adjustment of the axial position of the fixing mechanism in the side branch pipe.

5. The adjustable curved sheath handle according to claim 4, wherein the securing mechanism is sleeved outside the screw portion, and the traction wire is located in the securing mechanism to be located in an eccentric position in the side branch.

6. The adjustable curved sheath handle according to claim 5, wherein,

the moving mechanism further includes:

and the limiting part is positioned in the handle shell of the side branch pipe, is matched with the fixing mechanism to prevent the fixing mechanism from rotating in the radial direction, and realizes that the fixing mechanism only moves forwards and backwards along the axial direction of the side branch pipe.

7. The adjustable curved sheath handle according to claim 3, wherein said movement mechanism comprises:

the screwing part and the fixing mechanism form a screw pair; the part of the screwing part is positioned outside the side branch pipe and is manually screwed by an operator to realize the adjustment of the axial position of the screwing part in the side branch pipe;

the fixing mechanism and the screwing part move synchronously along the axial direction to adjust the length of the traction wire in the sheath tube body, so that the bending degree of the adjustable bending section of the sheath tube body is controlled.

8. The adjustable curved sheath handle according to claim 7, wherein,

and a ball bearing is arranged between the fixing mechanism and the screwing part so as to buffer friction between the fixing mechanism and the screwing part, so that the rotation of the traction wire is delayed, and the traction wire only axially moves along with the side branch pipe along with the fixing mechanism.

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