Adjustable curved medical device

Abstract

The present invention provides an adjustable bending medical device, comprising a sheath, a bending wire, a driving mechanism and a handle connected to the sheath, one end of the bending wire is connected to the distal end of the sheath, the other end of the bending wire is connected to the driving mechanism, the driving mechanism can pull and release the bending wire to adjust the shape of the sheath, the handle comprises a shell with a handle cavity, the driving mechanism is arranged in the handle cavity, the handle also comprises a knob, the knob can be rotated relative to the shell to control the movement of the driving mechanism. The present invention can realize single-handed bending, and the operation is smoother and labor-saving, and is suitable for use in interventional surgery.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to an adjustable bending medical device. Background Art

[0002] Interventional surgery is an operation that uses corresponding interventional equipment, such as guidewires and catheters, to diagnose and treat through vascular routes under the guidance of medical imaging equipment. Interventional surgical treatment has the advantages of low human invasion, less trauma, fewer complications and risks. In interventional surgery, in order to adapt to different uses and the anatomical morphology of specific lesions, the distal end of the sheath (the end away from the operator) is usually pre-shaped into different bending shapes. Different models of pre-bent sheaths correspond to different pre-bending angles and bending shapes, which are convenient for operators to choose. When selecting a sheath, the operator first observes the location of the lesion with the assistance of medical imaging equipment such as DSA (Digital Subtraction Angiography) and ultrasound, and then selects a pre-shaped sheath with a similar bending shape based on judgment. Due to observation errors and individual differences, it is difficult to select a sheath that meets the requirements at one time. When such problems occur, the operator usually needs to withdraw the sheath and then reselect another type of sheath for insertion. The existing operating method not only requires the hospital to prepare a large number of sheaths of different models to meet different bending requirements, but more importantly, in the process of repeated selection of sheaths, it will cause damage to the patient's blood vessels, increase the risk of surgery, and also prolong the time of interventional surgery, increase the time that the patient and operator are exposed to radiation, and pose a safety hazard.

[0003] Based on the above situation, in recent years, a sheath with adjustable angle at the distal end has been developed. The curvature of the distal end of the sheath is adjusted by cooperating with the bending wire fixed inside the sheath through the handle outside the body, so that the distal end of the sheath has a variable bending shape to meet the needs of surgery. Figure 1 As shown, the handle 40 of the existing adjustable bending sheath is mainly a bifurcated structure, including a handheld portion 41 and a bending adjustment mechanism 42 bifurcated from the handheld portion 41. When the operator is operating, one hand holds the handheld portion 41 to stabilize the instrument, and the other hand operates the bending adjustment mechanism 42 to adjust the curvature of the sheath. The whole process requires the cooperation of both hands and cannot be completed with one hand. When it is necessary to push the implant into the sheath 10, the hand that is used for bending needs to be used to push the implant. It is impossible to adjust the bend and push the implant at the same time, which is inconvenient to operate. Summary of the invention

[0004] The present invention overcomes the shortcomings of the prior art that the adjustable bending device needs to be operated with both hands and cannot simultaneously adjust the bending and push the surgical implant, and provides an adjustable bending medical device.

[0005] The technical solution adopted by the present invention to achieve the purpose of the invention is: an adjustable bending medical device, including a sheath, a bending adjustment wire, a driving mechanism and a handle connected to the sheath, one end of the bending adjustment wire is connected to the distal end of the sheath, and the other end of the bending adjustment wire is connected to the driving mechanism. The driving mechanism can pull and release the bending adjustment wire to adjust the shape of the sheath, the handle includes a shell formed with a handle cavity, the driving mechanism is arranged in the handle cavity, and the handle also includes a knob, which can be rotated on the shell relative to the shell to control the movement of the driving mechanism.

[0006] The beneficial effect of the present invention is that compared with the existing bifurcated structure, the driving mechanism of the present invention is installed in the handle, the product is more concise, and it is convenient for the operator to operate and hold. During the operation, the operator holds the handle with one hand, turns the knob on the handle, adjusts the curvature of the sheath, and pushes the implant into the sheath with the other hand. The operator can adjust the angle of the sheath in real time during the delivery process, and the operation is more convenient.

[0007] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Attached Figure 1 The figure is a schematic diagram of the structure of an adjustable bending sheath tube in the prior art.

[0009] Attached Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0010] Attached Figure 3 It is an assembly schematic diagram of the present invention.

[0011] Attached Figure 4 It is a schematic diagram of the assembly of the knob, the driving mechanism and the knob seat of the present invention.

[0012] Attached Figure 5 The assembly diagram of the knob and the driving mechanism of the present invention is shown in FIG. Figure 1 .

[0013] Attached Figure 6 The assembly diagram of the knob and the driving mechanism of the present invention is shown in FIG. Figure 2 .

[0014] Attached Figure 7 It is a schematic structural diagram of the winding pole of the present invention.

[0015] Attached Figure 8 It is a schematic diagram of assembling a pair of transmission rods and a pair of winding poles of the present invention.

[0016] Attached Fig. 9 For attachment Figure 8 A-direction view.

[0017] Attached Fig.10 It is a schematic diagram of the assembly of the sheath tube and the bending adjustment wire of the present invention.

[0018] Attached Fig.11 For attachment Fig.10 BB cross-sectional view.

[0019] In the accompanying drawings, 1 is an adjustable bending device, 10 is a sheath, 11 is an adjustable bending structure, 12 is a bending wire channel, 20 is a handle, 21 is a driving mechanism, 211 is a mounting seat, 212 is a transmission component, 2121 is a transmission rod, 2122 is a worm, 2123 is a gear, 2124 is an idler wheel, 213 is a winding component, 2131 is a winding column, 2132 is a worm wheel, 2133 is a winding groove, 2134 is a bending wire fixing assembly, 2135 is a bending wire fixing part, 2136 is a fixing part slot, 22 is a pipe joint, 23 is a shell, 231 is an outer shell, 232 is a distal cover, 233 is a knob seat, 2331 is an opening, 234 is a proximal cover, 24 is a knob, 30 is a bending wire, 40 is a handle of an existing adjustable bending sheath, 41 is a hand-held part, and 42 is a bending mechanism. DETAILED DESCRIPTION

[0020] As attached Figure 2-3 As shown, a bendable medical device of this embodiment includes a sheath tube 10, a bend adjusting wire 30 (the bend adjusting wire 30 is Figure 3 and Figure 5 ), a drive mechanism 21 and a handle 20 connected to the sheath tube 10.

[0021] As attached Figure 3 As shown, the handle 20 of this embodiment includes: a housing 23 with a handle cavity, a knob 24 and a pipe joint 22. The housing 23 of the handle includes a shell 231, a distal cover 232, a knob seat 233 and a proximal cover 234.

[0022] The knob seat 233 is provided with an opening 2331 for exposing the transmission structure of the driving mechanism 21 to engage with the knob 24 .

[0023] The distal cover 232 and the knob seat 233 are provided with through holes for the sheath tube 10 to pass through, and the proximal end of the sheath tube 10 is inserted into the shell 231 through the through hole. One end of the knob seat 233 is fixedly connected to the distal cover 232, and the other end of the knob seat 233 is fixedly connected to the shell 231, and the rear end cover 234 is fixedly connected to the shell 231, and assembled into a complete cavity structure.

[0024] The knob 24 is disposed on the housing 23 and is rotatable on the housing 23. The knob 24 is used to control the movement of the driving mechanism 21, thereby controlling the movement of the bending wire 30. The end of the handle 20 close to the operator is defined as the proximal end, and the end away from the operator is defined as the distal end. The knob 24 is disposed at the distal end of the handle 20, which is ergonomic and convenient for operation and holding.

[0025] The proximal end of the sheath tube 10 is connected to the pipe joint 22 to form a delivery channel for delivering implants, such as surgical instruments. In order to avoid the implant from being pushed smoothly in the combined delivery channel, the penetration, integrity and fixity of the delivery channel relative to the shell 23 should be ensured, and the sheath tube 10 and the pipe joint 22 are fixedly connected to the shell 23. By adopting this fixed connection method, the combined delivery channel is transformed into an integrated, non-segmentally rotatable structure, which solves the problem that the combined delivery channel, due to relative rotation of a certain section, causes the implant to twist during the delivery process and the position is uncontrollable, which is conducive to the pushing of the implant. The pipe joint 22 of this embodiment is a Luer joint.

[0026] See also Figure 3 and Figure 5 The driving mechanism 21 of this embodiment is disposed in the handle cavity of the handle 20, and is connected to the housing 23 of the handle 20 through a mounting seat 211. The driving mechanism 21 is connected to the end of the bending wire 30, and can pull and release the bending wire 30 to adjust the shape of the sheath 10. The operator rotates the knob 24 to drive the driving mechanism 21 to rotate, pull and wind the bending wire 30 fixed on the driving mechanism 21, and control the pulling and releasing of the bending wire 30. When the bending wire 30 is pulled, the sheath 10 is bent and deformed, and when the bending wire 30 is released, the sheath 10 returns to a straight tube. The bending process can be operated with one hand, and the operator's other hand can be used to push the implant into the sheath 10.

[0027] The driving mechanism 21 of this embodiment includes two winding components 213, both of which are linked to the knob 24, and the two winding components 213 are respectively located on both sides of the sheath tube 10. Two bending adjustment wires 30 are arranged in the sheath tube 10, and the two bending adjustment wires 30 are respectively arranged in a one-to-one correspondence with the two winding components 213. The bending adjustment wires 30 and the winding components 213 arranged corresponding to each other are located on the same side of the sheath tube 10, and the proximal end portion of any bending adjustment wire 30 extends from the gap between the sheath tube 10 and the winding component 213, and is connected to the winding component 213 arranged accordingly. With this wire-out method, the wire-out angle is small, and the pulling force applied to the bending adjustment wire 30 is mainly a longitudinal force, and the lateral force (i.e., the hand along the radial direction of the sheath tube 10) is small, so the bending is smoother and more labor-saving. After the two bending adjustment wires 30 pass through the wire outlet of the sheath tube 10, they are respectively wound on the two winding components 213. When the winding component 213 rotates, one bending wire 30 is pulled and the other bending wire 30 is released. The pulled bending wire 30 pulls the sheath tube 10 fixed thereto, driving the sheath tube 10 to bend in one direction. Similarly, when the winding component 213 rotates in the opposite direction, the other bending wire 30 is pulled, driving the sheath tube 10 to bend in the opposite direction. The sheath tube 10 of this embodiment can be bent in both directions, and can be adjusted to the most suitable angle without rotating the sheath tube 10 outside the body, and can adapt to more complex anatomical structures.

[0028] In another embodiment, if only the unidirectional bending function of the sheath tube 10 is to be realized, the driving mechanism 21 may also include at least one winding component 213, which is linked to the knob 24 and is located radially outside the sheath tube 10. The bending wire 30 extends from the gap 213 between the sheath tube 10 and the winding component 213, and is connected to the winding component 213. When the winding component 213 rotates, the bending wire 30 is pulled, pulling the sheath tube 10 fixed thereto, and driving the sheath tube 10 to bend in one direction. When the winding component 213 rotates in the opposite direction, the bending wire 30 is released, and the sheath tube 10 recovers.

[0029] As attached Figure 3-4 As shown, the driving mechanism 21 of this embodiment also includes a transmission component 212, which is located in the middle of the two winding components 213. The transmission component 212 is linked with the two winding components 213. The transmission component 212 and the winding component 213 are packaged together through the mounting seat 211, and are fixedly mounted in the knob seat 233 as a whole. The inner wall of the knob 24 is provided with an inner gear ring, and the knob 24 is sleeved on the knob seat 233. Part of the transmission structure of the transmission component 212 is exposed from the opening 2331 of the knob seat 233, meshing with the inner gear ring of the knob 24, and the transmission component 212 is linked with the knob 24. During the bending process, the knob 24 is turned, and the inner gear ring of the knob 24 is meshed with the transmission component 212. The transmission component 212 transmits the torque applied by the operator to the knob 24 to the winding component 213. The knob 24 can drive the two winding components 213 to rotate through the transmission component 212. The control structure has the advantages of compact structure, stability and reliability, and labor saving.

[0030] As attached Figure 3 and attached Figure 5As shown, the transmission component 212 of this embodiment includes a transmission rod 2121. In order to save space, a plurality of transmission elements are assembled on the transmission rod 2121. Specifically, the transmission rod 2121 includes a worm 2122 and a gear 2123 connected coaxially, the worm 2122 is used to cooperate with the winding component 213, at least one gear 2123 is provided at one end of the worm 2122, and the gear 2123 is used to cooperate with the inner gear ring of the knob 24, so that the knob 24 drives the transmission rod 2121 to rotate. In order to prevent the gear 2123 of the transmission rod 2121 from interfering with other transmission structures due to structural space when it is directly engaged with the knob 24, the transmission component 212 of this embodiment also includes an idler wheel 2124, and the idler wheel 2124 is arranged parallel to the axis of the transmission rod 2121. The idler wheel 2124 is arranged between the knob 24 and the gear 2123 for transmission. In order to ensure transmission balance, the number of gears 2123 of the transmission rod 2121 of this embodiment is two, and the two gears 2123 are connected to the worm 2122 at both ends of the worm 2122. The tooth width of the idler wheel 2124 corresponds to the tooth width at both ends of the gear 2123 of the transmission rod 2121, and the idler wheel 2124 is meshed with the gears 2123 at both ends of the transmission rod 2121. When adjusting the knob 24, the idler wheel 2124 is driven by the inner gear ring of the knob 24, and the rotational motion is then transmitted to the gears 2123 at both ends of the transmission rod 2121 through the idler wheel 2124. In order to ensure good and smooth meshing of the gears 2123, the gears 2123 are made of self-lubricating polymer materials or metal materials. The idler wheel 2124, the transmission rod 2121 and the worm wheel 2132 are meshed to form a transmission unit.

[0031] As attached Figure 5 As shown, the two winding components 213 of this embodiment both include a winding post 2131 for winding the bending wire 30. Both winding posts 2131 are provided with a worm wheel 2132 meshing with the worm 2122, and the worm 2122 drives the worm wheel 2132 to rotate. The two winding posts 2131 are arranged on both sides of the transmission rod 2121, the transmission rod 2121 and the axis of the winding posts 2131 are arranged perpendicularly, the axis of the knob 24 is arranged parallel to the axis of the transmission rod 2121, and the gear 2123 of the transmission rod 2121 is meshed with the inner gear ring of the knob 24 to drive the two winding posts 2131 to rotate. The gear 2123 of the transmission rod 2121 rotates under the drive of the knob 24, and the worm 2122 of the transmission rod 2121 rotates therewith, thereby driving the worm wheel 2132 of the winding post 2131 to rotate, and finally causing the winding post 2131 to rotate as a whole. The proximal end of the bending adjustment wire 30 is fixedly connected to the winding post 2131 , and the bending adjustment wire 30 rotates therewith and is pulled and wound. The self-locking structure of the worm gear can self-lock at any position after the knob 24 is released.

[0032] In order to ensure balanced force, two sets of transmission structures are symmetrically arranged along the diameter direction of the knob 24 in this embodiment. There are two worm wheels 2132 of the winding post 2131, and the two worm wheels 3132 are located at both ends of the winding post 2131. Two sets of transmission rods 2121 and idler wheels 2124 are symmetrically arranged along the diameter direction of the knob 24. The two winding posts 2131 are arranged on both sides of a pair of transmission rods 2121, and the worm gears 2122 of the two transmission rods 2121 are respectively engaged with the worm gears 2132 at one end of the two winding posts 2131. The knob 24 drives the pair of transmission rods 2121 to rotate through the idler wheels 2124. The worm gear 2122 of one transmission rod 2121 drives the worm wheel 2132 at one end of the two winding posts 2131 to rotate, and the worm gear 2122 of the other transmission rod 2121 drives the worm wheel 2132 at the other end of the two winding posts 2131 to rotate. Of course, as shown in the attached figure Figure 6 As shown, in another embodiment, only one set of transmission structures may be provided, and the knob 24 drives the two winding posts 2131 to rotate through only one transmission rod 2121 .

[0033] As attached Figure 7 As shown, the winding post 2131 of this embodiment is also provided with a winding groove 2133, which can limit the winding position of the bending wire 30 on the winding post 2131. The winding groove 2133 is recessed inward along the radial direction of the winding post 2131. During the rotation of the winding post 2131, the bending wire 30 is wound in the winding groove 2133. The winding post 2131 of this embodiment is also provided with a bending wire fixing assembly 2134 for fixing the bending wire 30 on the winding post 2131. The bending wire fixing assembly 2134 includes a bending wire fixing part 2135 and a fixing part slot 2136 provided on the winding post 2131. The size of the fixing part slot 2136 corresponds to that of the bending wire fixing part 2135. The bending wire fixing part 2135 is plugged into the fixing part slot 2136. The bending wire 30 is connected to the bending wire fixing part 2135. In order to prevent the bending wire fixing piece 2135 from falling off from the fixing piece slot 2136, the bending wire fixing piece 2135 of this embodiment is a conical structure with a cone angle of 5° to 7° on the outer surface, and can be made of metal alloys such as stainless steel and brass. The bending wire fixing piece 2135 is provided with a slot, and the bending wire 30 is tied to the slot. The winding post 2131 is provided with a bending wire channel that passes through the fixing piece slot 2136. One end of the bending wire 30 is connected to the bending wire fixing piece 2135, and the other end of the bending wire 30 passes through the bending wire channel and passes through the column of the winding post 2131. The direction of the pulling force applied to the bending wire 30 is consistent with the direction in which the bending wire fixing piece 2135 is inserted into the fixing piece slot 2136. When the bending wire 30 is tightened, the pulling force applied to the bending wire 30 makes the conical surface of the bending wire fixing piece 2135 fit tightly with the inner wall surface of the fixing piece slot 2136, and the bending wire 30 located between the two is compressed to ensure that the bending wire 30 will not slip off.

[0034] In order to ensure the smooth meshing, the transmission ratio of the worm wheel 2132 and the worm 2122 is in the range of 7.5 to 13, and the transmission ratio selected in this embodiment is 8. The number of teeth of the worm wheel 2132 is 30 to 40, and 32 teeth are selected in this embodiment. The worm 2122 meshing therewith is a multi-start thread, and four-start threads are selected in this embodiment. The transmission ratio of the gear 2123 and the knob 24 is in the range of 4 to 7.5, and the transmission ratio selected in this embodiment is 5.167. The number of teeth of the gear 2123 is 20 to 30, and 24 teeth are selected in this embodiment. The number of teeth of the knob 24 is 120 to 150, and 132 teeth are selected in this embodiment.

[0035] After the two bending wires 30 of this embodiment are drawn out from the sheath tube 10, the bending wires 30 extend from the gap 213 between the sheath tube 10 and the winding component, and are wound in the winding groove 2133 on the same side. The winding directions of the two bending wires 30 are opposite. The knob 24 drives the two winding posts 2131 to rotate in the same direction through the transmission rod 2121, so that one bending wire 30 is pulled and the other bending wire 30 is released. Figure 8-9 As shown, in order to realize the same-direction rotation with a compact structure, the worm 2122 of the transmission rod 2121 of this embodiment is provided with two spiral lines crossing in two directions, and the tooth direction of the worm wheel 2132 of the winding post 2131 corresponds to the spiral line on the same side, that is, the tooth direction of the worm wheel 2132 arranged on both sides of the worm 2122 is opposite. Through the design of the two-way crossing spiral line, the worm wheels 2132 of the two winding posts 2131 rotate in the same direction after meshing with the worm 2122. Turn the knob 24, and through the transmission of the gear meshing, drive the worm 2122 to rotate. The two-way crossing spiral lines on the worm 2122 make the worm wheels 2132 with opposite tooth directions on both sides rotate in the same direction, thereby controlling the two bending wires 30 at the same time. When one bending wire 30 is pulled, the other bending wire 30 is released, so as to realize the bending of the distal end of the sheath tube 10 in two directions on the same plane. In order to make the winding post 2131 closer to the central axis of the sheath tube 10, the purpose of reducing the wire outlet angle is achieved. In another embodiment, a cutting portion is provided on the outer edge of the sheath tube 30 , and the sheath tube 30 can accommodate at least a portion of the winding rod 2131 .

[0036] As attached Fig.10 As shown, the sheath tube 10 of this embodiment is a straight tube in a natural state, and the end of the sheath tube 10 close to the operator is defined as the proximal end, and the end away from the operator is defined as the distal end. The distal end of the sheath tube 10 includes an adjustable bending structure 11 that can be bent and reset. The adjustable bending structure 11 can be bent within a certain angle range and actively restore after the external force is removed. The adjustable bending structure 11 is made of a corrugated tube cut from a nickel-titanium tube or a stainless steel tube. The adjustable bending structure 11 can be bent while providing good support.

[0037] A bending wire channel 12 is provided in the wall of the sheath tube 10, and a wire outlet communicated with the bending wire channel 12 is provided on the wall of the sheath tube 10, for the bending wire 30 to pass through the inner wall of the sheath tube 10. The bending wire channel 12 is built with a PTFE (Poly tetrafluoroethylene) liner tube, which has good self-lubricating properties and can reduce the sliding resistance of the bending wire 30 during bending. The outlet at one end of the bending wire channel 12 is docked with the adjustable bending structure 11, and the outlet at the other end of the bending wire channel 12 is docked with the wire outlet.

[0038] The bending adjustment wire 30 of this embodiment is made of nickel-titanium wire or stainless steel wire, and is built into the bending adjustment wire channel 12 of the sheath tube 10. One end of the bending adjustment wire 30 extends through the bending adjustment wire channel 12 and is connected to the adjustable bending structure 11 at the distal end of the sheath tube 10. By pulling the adjustable bending structure 11 of the sheath tube 10, the adjustable bending structure 11 is bent to adjust the angle of the distal end of the sheath tube 10. The other end of the bending adjustment wire 30 passes through the bending adjustment wire channel 12 and is used to be connected to the driving mechanism 21.

[0039] For complex lesions with twisted blood vessels, unidirectional bending often cannot reach the expected angle and position at one time, and multiple adjustments are required by rotating the sheath tube 10 in vitro. To solve this problem, bidirectional bending of the sheath tube 10 in the same plane is achieved, as shown in the attached Fig.11 As shown, two bending adjustment wires 30 are provided in the sheath tube 10 of this embodiment, and the two bending adjustment wires 30 are located in the same radial plane of the sheath tube 10, and the two bending adjustment wires 30 are symmetrically arranged along the diameter direction of the sheath tube 10. Because the two bending adjustment wires 30 and the fixing points of the adjustable bending structure 11 are symmetrically arranged along the radial direction, the two bending adjustment wires 30 pull the sheath tube 10 to bend in opposite directions.

[0040] In actual operation, the operator holds the handle 20 with one hand and rotates the knob 24 in a certain direction. The knob 24 drives the transmission component 212 to rotate, causing the winding component 213 to rotate, pulling the bending adjustment wire 30 wound on the winding component 213, and the adjustable bending structure 11 is pulled under the action of the bending adjustment wire 30, and the distal end of the sheath tube 10 is bent and deformed to one side. Similarly, when the knob 24 is rotated in the opposite direction, the distal end of the sheath tube 10 is bent to the other side.

[0041] The above description is only a preferred embodiment of the present application, and does not limit the implementation mode and protection scope of the present application. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present application should be included in the protection scope of the present application.

Claims

1. A medical device with adjustable bending, comprising a sheath, a bending wire, a driving mechanism and a handle connected to the sheath, wherein one end of the bending wire is connected to the distal end of the sheath, and the other end of the bending wire is connected to the driving mechanism, and the driving mechanism can pull and release the bending wire to adjust the shape of the sheath, and the handle comprises a shell having a handle cavity, characterized in that: The driving mechanism is arranged in the handle cavity, and the handle also includes a knob, which is arranged on the shell and can be rotated relative to the shell to control the movement of the driving mechanism; the driving mechanism includes at least one winding component, which is linked to the knob, and the winding component is located radially outside the sheath tube. The proximal end portion of the bending wire extends in the gap between the sheath tube and the winding component and is connected to the winding component.

2. The adjustable bending medical device according to claim 1, characterized in that: The handle also includes a pipe joint, the proximal end of the sheath is connected to the pipe joint to form a delivery channel, and the sheath and the pipe joint are both fixedly connected to the shell.

3. The adjustable bending medical device according to any one of claims 1 to 2, characterized in that: The driving mechanism includes two winding components, both of which are linked to the knob, and the two winding components are respectively located on both sides of the sheath tube. There are two bending adjustment wires, and the two bending adjustment wires are respectively arranged in a one-to-one correspondence with the two winding components. The bending adjustment wires and the winding components arranged corresponding to each other are located on the same side of the sheath tube, and the proximal end portion of any bending adjustment wire extends from the gap between the sheath tube and the corresponding winding component, and is connected to the winding component arranged accordingly.

4. The adjustable bending medical device according to claim 3, characterized in that: The driving mechanism includes at least one transmission component, the transmission component is linked to the knob, and the transmission component is linked to the two winding components. The knob can drive the two winding components to rotate through the transmission component.

5. The adjustable bending medical device according to claim 4, characterized in that: The number of the transmission components is one, and the transmission component includes a transmission rod, and the transmission rod includes a worm and a gear coaxially connected. The two winding components each include a winding post, and the two winding posts are provided with a worm wheel meshing with the worm. The two winding posts are arranged on both sides of the transmission rod, and the gear of the transmission rod meshes with the inner gear ring of the knob to drive the two winding posts to rotate, and the proximal end of the bending wire is fixedly connected to the winding post.

6. The adjustable bending medical device according to claim 5, characterized in that: The knob drives the two winding posts to rotate in the same direction.

7. The adjustable bending medical device according to claim 5, characterized in that: The worm is provided with two spiral lines crossing in two directions, the tooth direction of the worm wheel corresponds to the spiral line on the same side, and the worm wheels of the two winding posts rotate in the same direction after meshing with the worm.

8. The adjustable bending medical device according to claim 5, characterized in that: The winding post is provided with a winding groove, the winding groove is recessed inwardly along the radial direction of the winding post, and the bending wire is wound in the winding groove.

9. The adjustable bending medical device according to claim 5, characterized in that: The winding post is provided with a bending wire fixing assembly for fixing the bending wire on the winding post, the bending wire fixing assembly includes a bending wire fixing piece and a fixing piece slot provided on the winding post, the size of the fixing piece slot corresponds to the bending wire fixing piece, the bending wire fixing piece is plugged into the fixing piece slot, and the bending wire is connected to the bending wire fixing piece.

10. The adjustable bending medical device according to claim 5, characterized in that: The winding post has two worm wheels, which are located at both ends of the winding post. Two transmission rods are symmetrically arranged in the diameter direction of the knob, and the worms of the two transmission rods are respectively meshed with the worm wheels at one end of the two winding posts.

11. The adjustable bending medical device according to claim 5, characterized in that: The transmission component further comprises an idler wheel, and the idler wheel is arranged for transmission between the knob and the gear.

12. The adjustable bending medical device according to claim 11, characterized in that: The number of the gears is two, the two gears are connected to the worm at both ends of the worm, and the idler gear is meshed with the two gears.

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