CN114680954A

CN114680954A - Medical device capable of adjusting bending

Info

Publication number: CN114680954A
Application number: CN202011619771.0A
Authority: CN
Inventors: 汤麟; 李安宁
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-01

Abstract

The invention provides a bending-adjustable medical device which comprises a sheath tube, a bending-adjustable wire, a driving mechanism and a handle connected with the sheath tube, wherein one end of the bending-adjustable wire is connected with the far end of the sheath tube, the other end of the bending-adjustable wire is connected with the driving mechanism, the driving mechanism can pull and release the bending-adjustable wire to adjust the shape of the sheath tube, the handle comprises a shell formed with a handle cavity, the driving mechanism is arranged in the handle cavity, and the handle further comprises a knob which can rotate relative to the shell on the shell to control the driving mechanism to move. The invention can realize bending adjustment by one hand, has smoother operation and labor saving and is suitable for being used in interventional operations.

Description

Medical device capable of bending

Technical Field

The invention relates to the field of medical instruments, in particular to a medical device capable of being bent.

Background

The interventional operation is an operation of diagnosis and treatment through a blood vessel by using corresponding interventional equipment, such as a guide wire, a catheter and the like under the guidance of medical imaging equipment. The interventional operation treatment has the advantages of low human body invasion, small wound, less complications, less risk and the like. In an interventional operation, in order to adapt to different uses and anatomical shapes of specific lesion sites, the distal end (i.e., the end far away from an operator) of a sheath is usually pre-molded into different curved shapes, and pre-bent sheaths of different types correspond to different pre-bent angles and curved shapes, so that the operator can select and use the pre-bent sheaths conveniently. When an operator selects a sheath, the operator firstly observes the lesion position under the assistance of medical images such as DSA (Digital Subtraction Angiography) and ultrasound and then selects a pre-shaped sheath with a similar bending form according to judgment. Because of the error of observation and individual difference, it is difficult to select the sheath pipe meeting the requirements at one time, when such a problem occurs, the operator usually needs to withdraw the sheath pipe, and then reselects the sheath pipes of other models to insert, the existing operation mode, not only the hospital needs to prepare a large number of sheath pipes of different models to meet different bending requirements, more important, in the process of repeatedly selecting the sheath pipe, the injury of the diseased vessel can be caused, the risk of the operation is increased, the time of the interventional operation is prolonged, the radiation contact time of the diseased and the operator is increased, and the potential safety hazard is realized.

Based on the situation, in recent years, a sheath tube with a far end capable of adjusting the angle is developed, the bending degree of the far end of the sheath tube is adjusted by matching a handle outside the body with a bending adjusting wire fixed in the sheath tube, so that the far end of the sheath tube has a variable bending form, and the requirement of an operation is met. As shown in fig. 1, the handle 40 of the conventional bendable sheath is mainly of a bifurcated structure, and includes a handheld portion 41 and a bending adjusting mechanism 42 disposed to be bifurcated with the handheld portion 41. When the sheath bending device is operated by an operator, the handheld part 41 is held by one hand to stabilize the instrument, the bending adjusting mechanism 42 is operated by the other hand to adjust the bending degree of the sheath, and the whole process needs two hands to cooperate and operate and cannot be completed by one hand. When the implant needs to be pushed into the sheath tube 10, the bent hand needs to be used for pushing the implant, so that the bending adjustment and the pushing of the implant cannot be considered, and the operation is inconvenient.

Disclosure of Invention

The invention overcomes the defects that the bending-adjustable device in the prior art needs to be operated by two hands and cannot give consideration to bending adjustment and pushing of surgical implants at the same time, and provides a bending-adjustable medical device.

The invention adopts the technical scheme that the purpose of the invention is realized by: the utility model provides a medical device that can bend, including the sheath pipe, transfer the curved silk, actuating mechanism and the handle that links to each other with the sheath pipe, the one end of transferring the curved silk links to each other with the sheath pipe distal end, the other end of transferring the curved silk links to each other with actuating mechanism, actuating mechanism can transfer the form of curved silk tractive and release in order to adjust the sheath pipe, the handle is including the casing that is formed with the handle chamber, actuating mechanism locates the handle intracavity, the handle still includes the knob, the knob can rotate for the casing on the casing in order to control the actuating mechanism motion.

The invention has the beneficial effects that: compared with the existing forked structure, the driving mechanism is arranged in the handle, so that the product is simpler and is convenient for an operator to operate and hold. In the operation process, an operator holds the handle by one hand, rotates the knob on the handle to adjust the curvature of the sheath tube, pushes the implant into the sheath tube by the other hand, and can adjust the angle of the sheath tube in real time in the process of delivering the implant, so that the operation is more convenient.

The invention is further described with reference to the following figures and embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a prior art adjustable bent sheath tube.

Fig. 2 is a schematic diagram of the overall structure of the present invention.

Fig. 3 is an assembly schematic of the present invention.

FIG. 4 is a schematic view of the assembly of the knob, the driving mechanism and the knob seat of the present invention.

Fig. 5 is a first schematic view of the assembly of the knob and the driving mechanism of the present invention.

FIG. 6 is a second schematic view of the assembly of the knob and the driving mechanism of the present invention.

Fig. 7 is a schematic structural view of the wrapping post of the present invention.

Fig. 8 is a schematic view of the assembly of a pair of transmission rods and a pair of winding posts in accordance with the present invention.

Fig. 9 is a view along a of fig. 8.

Fig. 10 is a schematic view of the assembly of the sheath and the bend adjusting wire of the present invention.

Fig. 11 is a sectional view taken along line B-B of fig. 10.

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

Detailed Description

As shown in fig. 2 to 3, the medical device with adjustable bending of the present embodiment includes a sheath 10, a bending wire 30 (the bending wire 30 is shown in fig. 3 and 5), a driving mechanism 21, and a handle 20 connected to the sheath 10.

As shown in fig. 3, the handle 20 of the present embodiment includes: a housing 23 forming a handle cavity, a knob 24 and a nipple 22. The housing 23 of the handle includes a shell 231, a distal cap 232, a knob holder 233 and a proximal cap 234.

The knob seat 233 is provided with an opening 2331 for exposing the drive mechanism of the drive mechanism 21 to engage the knob 24.

The distal cap 232 and the knob seat 233 are provided with through holes through which the sheath 10 passes, and the proximal end of the sheath 10 is inserted into the housing 231 through the through holes. One end of the knob seat 233 is fixedly connected with the distal end cover 232, the other end of the knob seat 233 is fixedly connected with the housing 231, and the rear end cover 234 is fixedly connected with the housing 231, so that a complete cavity structure is assembled.

A knob 24 is provided on the housing 23, the knob 24 being rotatable in the housing 23, the knob 24 being adapted to control the movement of the drive mechanism 21 and thereby the bending wire 30. The handle 20 is defined as a proximal end near the operator and a distal end far from the operator, and the knob 24 is disposed at the distal end of the handle 20, which is ergonomic and convenient to operate and hold.

The proximal end of sheath 10 is coupled to coupling 22 to form a delivery channel for delivering an implant, such as a surgical instrument. In order to avoid the implant from being pushed in the combined delivery channel in a non-smooth manner, the penetration, integrity and fixation of the delivery channel relative to the housing 23 should be ensured, and the sheath 10 and the tube connector 22 are fixedly connected to the housing 23. By adopting the fixed connection mode, the combined conveying channel is changed into an integrated structure which can not rotate in a segmented manner, so that the problems of twisting, uncontrollable position and the like of the implant in the conveying process due to relative rotation of a certain section of the combined conveying channel are solved, and the pushing of the implant is facilitated. The tube fitting 22 of the present embodiment is a luer fitting.

Referring to fig. 3 and 5, the driving mechanism 21 of the present embodiment is disposed in the handle cavity of the handle 20 and is connected to the housing 23 of the handle 20 through the mounting seat 211. The driving mechanism 21 is connected to an end of the bending wire 30, and can pull and release the bending wire 30 to adjust the shape of the sheath 10. An operator drives the driving mechanism 21 to rotate by rotating the knob 24, draws and winds the bending adjusting wire 30 fixed on the driving mechanism 21, and controls the bending adjusting wire 30 to draw and release. When the bending adjusting wire 30 is pulled, the sheath tube 10 is bent and deformed, and when the bending adjusting wire 30 is released, the sheath tube 10 is restored to a straight tube. The crimping process may be operated with one hand and the other hand of the operator may be used to push the implant into the sheath 10.

The driving mechanism 21 of the present embodiment includes two winding parts 213, both winding parts 213 are linked to the knob 24, and the two winding parts 213 are respectively located at both sides of the sheath 10. Two bending adjusting wires 30 are arranged in the sheath tube 10, the two bending adjusting wires 30 are respectively arranged corresponding to the two winding parts 213 one by one, the bending adjusting wires 30 and the winding parts 213 which are arranged corresponding to each other are positioned at the same side of the sheath tube 10, and the proximal part of any bending adjusting wire 30 extends from the gap between the sheath tube 10 and the winding part 213 and is connected with the winding part 213 which is arranged corresponding to the proximal part. By adopting the wire discharging mode, the wire discharging angle is small, the pulling force applied to the bending adjusting wire 30 is mainly longitudinal force, the transverse (namely, the radial direction of the hand along the sheath tube 10) component force is small, and the bending adjusting is smoother and more labor-saving. The two bending wires 30 are respectively wound on the two winding parts 213 after passing out from the wire outlet of the sheath tube 10. When the winding member 213 rotates, one bending wire 30 is pulled and the other bending wire 30 is released. The pulled bending adjusting wire 30 pulls the sheath 10 fixed with the wire, and drives the sheath 10 to bend towards one direction. Similarly, when the winding part 213 rotates in the reverse direction, the other bending wire 30 is pulled to drive the sheath tube 10 to bend in the reverse direction. The sheath 10 of the present embodiment can be bent in two directions, and can be adjusted to an optimum angle without rotating the sheath 10 in vitro, and can be adapted to more complicated anatomical structures.

In another embodiment, if only one-way bending of the sheath 10 is required, the driving mechanism 21 may also include at least one winding member 213, one winding member 213 is linked to the knob 24, and the winding member 213 is located at the radial outer side of the sheath 10. The bending wire 30 extends from the gap between the sheath 10 and the winding part 213, and is connected to the winding part 213. When the winding part 213 rotates, the bending adjusting wire 30 is pulled to pull the sheath tube 10 fixed thereto, so as to drive the sheath tube 10 to bend in one direction. When the winding part 213 rotates reversely, the bend adjusting wire 30 is released and the sheath 10 is restored.

As shown in fig. 3-4, the driving mechanism 21 of the present embodiment further includes a transmission member 212, the transmission member 212 is located between the two winding members 213, the transmission member 212 is linked with the two winding members 213, the transmission member 212 and the winding members 213 are packaged together by the mounting seat 211, and the whole is fixedly mounted in the knob seat 233. The inner wall of the knob 24 is provided with an inner gear ring, the knob 24 is sleeved on the knob seat 233, part of the transmission structure of the transmission part 212 is exposed out of the opening 2331 of the knob seat 233 and is engaged with the inner gear ring of the knob 24, and the transmission part 212 is linked with the knob 24. In the bending adjusting process, the knob 24 is rotated, the inner gear ring of the knob 24 is meshed with the transmission part 212, the transmission part 212 transmits the torque force applied to the knob 24 by an operator to the winding part 213, the knob 24 can drive the two winding parts 213 to rotate through the transmission part 212, and the control structure has the advantages of compact structure, stability, reliability, labor saving and the like.

As shown in fig. 3 and 5, the driving member 212 of the present embodiment includes a driving rod 2121. To save space, a plurality of drive elements are integrated on the drive rod 2121. Specifically, the driving rod 2121 includes a worm 2122 and a gear 2123 coaxially connected, the worm 2122 is configured to cooperate with the wire winding member 213, at least one gear 2123 is configured to provide an end of the worm 2122, and the gear 2123 is configured to cooperate with an internal gear of the knob 24, so that the knob 24 rotates the driving rod 2121. In order to prevent interference with other transmission structure due to space when the gear 2123 of the transmission rod 2121 is directly engaged with the knob 24, the transmission member 212 of this embodiment further includes an idle gear 2124, and the idle gear 2124 is disposed parallel to the axis of the transmission rod 2121. An idler gear 2124 is provided for driving between the knob 24 and the gear 2123. In order to ensure the transmission balance, the transmission rod 2121 of the present embodiment has two gears 2123, and the two gears 2123 are connected to the worm 2122 at both ends of the worm 2122. The idler gear 2124 has a tooth width corresponding to the tooth width of both ends of the gear 2123 of the transmission lever 2121, and the idler gear 2124 meshes with the gears 2123 of both ends of the transmission lever 2121. When the knob 24 is adjusted, the idler gear 2124 is driven by the inner gear of the knob 24, and the rotation is transmitted to the gears 2123 at both ends of the transmission rod 2121 by the idler gear 2124. For good smooth engagement of the gear 2123, the gear 2123 is made of a self-lubricating polymer material or a metal material. The idler 2124, the transmission rod 2121 and the worm wheel 2132 are engaged to constitute a transmission unit.

As shown in fig. 5, both winding members 213 of the present embodiment include a winding post 2131 for winding the bending wires 30. The two winding posts 2131 are respectively provided with a worm wheel 2132 meshed with the worm 2122, and the worm 2122 drives the worm wheel 2132 to rotate. The two winding posts 2131 are arranged on two sides of the driving rod 2121, the driving rod 2121 is arranged perpendicular to the axis of the winding posts 2131, the axis of the knob 24 is arranged parallel to the axis of the driving rod 2121, and the gear 2123 of the driving 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 driving rod 2121 is driven by the knob 24 to rotate, and the worm 2122 of the driving rod 2121 rotates together with the driving rod, so as to drive the worm wheel 2132 of the winding post 2131 to rotate, and finally, the winding post 2131 is integrally rotated. The proximal end of the bending adjusting wire 30 is fixedly connected with the winding post 2131, the bending adjusting wire 30 rotates along with the winding post, the winding is pulled, and the self-locking structure of the worm gear can realize self-locking at any position after the knob 24 is released.

In order to ensure balanced stress, two sets of transmission structures are symmetrically arranged along the diameter direction of the knob 24 in the embodiment. The number of the worm gears 2132 of the winding post 2131 is two, and the two worm gears 3132 are located at two ends of the winding post 2131. Two sets of driving rods 2121 and idler wheels 2124 are symmetrically arranged in the diameter direction of the knob 24, the two wrapping posts 2131 are arranged on both sides of the pair of driving rods 2121, and the worms 2122 of the two driving rods 2121 are respectively meshed with the worm wheels 2132 at one ends of the two wrapping posts 2131. The knob 24 drives a pair of driving rods 2121 to rotate through an idler 2124, a worm 2122 of one driving rod 2121 drives a worm wheel 2132 at one end of the two winding posts 2131 to rotate, and a worm 2122 of the other driving rod 2121 drives a worm wheel 2132 at the other end of the two winding posts 2131 to rotate. Of course, as shown in fig. 6, in another embodiment, only one set of transmission structures may be provided, and the knob 24 drives the two winding posts 2131 to rotate only through one transmission rod 2121.

As shown in fig. 7, the winding post 2131 of this embodiment further has a winding groove 2133 for limiting the winding position of the bending wire 30 on the winding post 2131. The winding groove 2133 is recessed inwards along the radial direction of the winding post 2131, and the bending adjusting wire 30 is wound in the winding groove 2133 in the rotating process of the winding post 2131. The winding post 2131 of this embodiment is further provided with a bending wire fixing assembly 2134 for fixing the bending wire 30 to the winding post 2131. The bending wire adjusting fixing assembly 2134 comprises a bending wire adjusting fixing piece 2135 and a fixing piece clamping groove 2136 arranged on the winding post 2131. The fastener slots 2136 are sized to correspond to the bend wire fasteners 2135. The bending wire adjusting fixing piece 2135 is inserted into the fixing piece clamping groove 2136. The bending adjusting wire 30 is connected with a bending adjusting wire fixing part 2135. In order to prevent the bending wire fixing piece 2135 from falling off from the fixing piece clamping groove 2136, the bending wire fixing piece 2135 in the embodiment is of a conical structure, the conical surface angle of the outer surface is 5-7 degrees, and the bending wire fixing piece can be made of metal alloys such as stainless steel and brass. The bending adjusting wire fixing part 2135 is provided with a slot, and the bending adjusting wire 30 is bound on the slot opening. The winding column 2131 is provided with a bending adjusting wire channel communicated with the fixing piece clamping groove 2136, one end of the bending adjusting wire 30 is connected with the bending adjusting wire fixing piece 2135, and the other end of the bending adjusting wire 30 penetrates out of the column body of the winding column 2131 through the bending adjusting wire channel. The direction of the pulling force applied to the bending adjusting wire 30 is consistent with the direction of the bending adjusting wire fixing piece 2135 inserted into the fixing piece clamping groove 2136, when the bending adjusting wire 30 is tensioned, the pulling force applied to the bending adjusting wire 30 tightly attaches the conical surface of the bending adjusting wire fixing piece 2135 to the inner wall surface of the fixing piece clamping groove 2136, the bending adjusting wire 30 located between the two is tightly pressed, and the bending adjusting wire 30 is ensured not to slip.

In order to ensure smooth meshing, the transmission ratio range of the worm wheel 2132 and the worm 2122 is as follows: 7.5-13, the transmission ratio selected by the embodiment is 8. The number of the teeth of the worm wheel 2132 is 30-40, in this embodiment, 32 teeth are selected, the worm 2122 meshed with the teeth is a multi-start thread, and in this embodiment, a four-start thread is selected. The range of the transmission ratio of gear 2123 to knob 24 is: 4-7.5, the gear ratio selected for the embodiment is 5.167. The number of teeth of gear 2123 is 20 ~ 30, and 24 teeth are selected for use to this embodiment, and the number of teeth of knob 24 is 120 ~ 150, and 132 teeth are selected for use to this embodiment.

After the two bending adjusting wires 30 of the present embodiment are led out from the sheath tube 10, the bending adjusting wires 30 extend from the gap 213 between the sheath tube 10 and the winding part, and are wound in the winding grooves 2133 on the same side, and the winding directions of the two bending adjusting 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 adjusting wire 30 is pulled, and the other bending adjusting wire 30 is released. As shown in fig. 8 to 9, in order to realize the same direction rotation with a compact structure, the worm 2122 of the driving rod 2121 of the present embodiment is provided with two spiral lines which are crossed in the same direction, the tooth direction of the worm wheel 2132 of the winding post 2131 corresponds to the same spiral line, that is, the tooth direction of the worm wheel 2132 provided on both sides of the worm 2122 is opposite, and the worm wheels 2132 of the two winding posts 2131 are meshed with the worm 2122 to rotate in the same direction by the design of the two-way crossed spiral lines. The knob 24 is rotated to drive the worm 2122 to rotate through the transmission of gear meshing, and the bidirectional crossed spiral lines on the worm 2122 enable the worm wheels 2132 with opposite teeth on two sides to rotate in the same direction, so that two bending adjusting wires 30 are controlled simultaneously, when one bending adjusting wire 30 is pulled, the other bending adjusting wire 30 is released, and the bending of the distal end of the sheath tube 10 in two directions on the same plane is realized. In order to make the winding post 2131 closer to the central axis of the sheath tube 10, the wire-drawing angle can be reduced. In another embodiment, the sheath 30 has a cut portion on the outer edge thereof, and the sheath 30 can accommodate at least a part of the column of the winding post 2131.

As shown in fig. 10, the sheath 10 of the present embodiment is a straight tube in a natural state, and defines one end of the sheath 10 close to the operator as a proximal end and one end far away from the operator as a distal end. The distal end of the sheath 10 includes a bendable and resettable adjustable bending structure 11, and the adjustable bending structure 11 can be bent within a certain angle range and can be actively restored after the external force is removed. The adjustable bending structure 11 is made of a nickel titanium pipe or a stainless steel pipe which is cut into a corrugated pipe, and the adjustable bending structure 11 can be bent while providing a good supporting force.

The wall of the sheath tube 10 is provided with a bending wire adjusting channel 12, and the wall of the sheath tube 10 is provided with a wire outlet communicated with the bending wire adjusting channel 12 for the bending wire 30 to pass through the inner wall of the sheath tube 10. A PTFE (polytetrafluoroethylene) lining tube is arranged in the bend adjusting wire channel 12, and has good self-lubricating performance, so that the sliding resistance of the bend adjusting wire 30 during bend adjustment can be reduced. An outlet at one end of the bending wire adjusting channel 12 is in butt joint with the bending adjustable structure 11, and an outlet at the other end of the bending wire adjusting channel 12 is in butt joint with the wire outlet.

The bending adjusting wire 30 of the present embodiment is made of a nickel titanium wire or a stainless steel wire, the bending adjusting wire 30 is disposed in the bending adjusting wire channel 12 of the sheath tube 10, one end of the bending adjusting wire 30 extends through the bending adjusting wire channel 12 and is connected to the adjustable bending structure 11 at the distal end of the sheath tube 10, and the adjustable bending structure 11 is bent by pulling the adjustable bending structure 11 of the sheath tube 10 to adjust the angle of the distal end of the sheath tube 10. The other end of the bend adjusting wire 30 passes through the bend adjusting wire channel 12 and is used for being connected with the driving mechanism 21.

For complex lesions with distorted blood vessels, the unidirectional bending adjustment often cannot reach the desired angle and position at one time, and the sheath 10 needs to be rotated in vitro for multiple adjustments. In order to solve the problem and realize bidirectional bending adjustment of the coplanar sheath tube 10, as shown in fig. 11, two bending adjustment wires 30 are disposed in the sheath tube 10 of this embodiment, 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 disposed along the diameter direction of the sheath tube 10. Because the two bending adjusting wires 30 are symmetrically arranged along the radial direction with the fixing points of the bending adjusting structure 11, the two bending adjusting wires 30 pull the sheath tube 10 to bend along the opposite direction.

In actual operation, an operator holds the handle 20 with one hand, rotates the knob 24 in a certain direction, the knob 24 drives the transmission component 212 to rotate, so that the winding component 213 rotates, pulls the bending adjusting wire 30 wound on the winding component 213, the bending adjusting structure 11 is pulled under the action of the bending adjusting 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 10 is bent toward the other side.

The above description is only a preferred example of the present application and is not intended to limit the scope of the present application, and it should be appreciated by those skilled in the art that the equivalents and obvious variations made in the description and drawings of the present application are included in the scope of the present application.

Claims

1. The utility model provides an adjustable curved medical device, include the sheath pipe, transfer curved silk, actuating mechanism and with the handle that the sheath pipe links to each other, transfer curved silk one end with the sheath pipe distal end links to each other, transfer curved silk the other end with actuating mechanism links to each other, actuating mechanism can be right transfer curved silk tractive and release in order to adjust the form of sheath pipe, the handle is including the casing that is formed with the handle chamber, a serial communication port, actuating mechanism locates in the handle chamber, the handle still includes the knob, the knob is located on the casing, the knob is in can for on the casing rotates with control actuating mechanism moves.

2. The adjustable bend medical device of claim 1, wherein said handle further comprises a nipple, wherein a proximal end of said sheath is connected to said nipple to form a delivery channel, and wherein said sheath and said nipple are both fixedly connected to said housing.

3. The adjustable bend medical device of claim 1, wherein said drive mechanism includes at least one winding member, said winding member being linked to said knob, said winding member being located radially outward of said sheath, a proximal portion of said bend wire extending in a gap between said sheath and said winding member and being connected to said winding member.

4. The medical device of any one of claims 1 to 3, wherein the driving mechanism includes two winding members, the two winding members are both linked to the knob, the two winding members are respectively located at two sides of the sheath tube, the number of the bending wires is two, the two bending wires are respectively arranged in one-to-one correspondence with the two winding members, the bending wires and the winding members which are arranged in correspondence with each other are located at the same side of the sheath tube, and a proximal portion of any one of the bending wires is extended from a gap between the sheath tube and the corresponding winding member and is connected to the winding member which is arranged in correspondence with the proximal portion.

5. The adjustable bend medical device of claim 4, wherein said knob rotates said two winding posts in the same direction.

6. The adjustable bend medical device of claim 4, wherein said driving mechanism comprises at least one transmission member, said transmission member is linked to said knob, said transmission member is linked to said two winding members, and said knob can drive said two winding members to rotate through said transmission member.

7. The adjustable bending medical device according to claim 6, wherein the number of the transmission parts is one, the transmission parts comprise transmission rods, each transmission rod comprises a worm and a gear which are coaxially connected, each of the two winding parts comprises winding posts, each winding post is provided with a worm wheel meshed with the worm, the two winding posts are arranged on two sides of the transmission rod, the gear of the transmission rod is meshed with an inner gear ring of the knob to drive the two winding posts to rotate, and the proximal ends of the bending wires are fixedly connected with the winding posts.

8. The adjustable bending medical device as claimed in claim 7, wherein the worm is provided with two spiral lines with intersecting directions, the worm wheel has a tooth direction corresponding to the spiral line on the same side, and the worm wheels of the two winding posts rotate in the same direction after being meshed with the worm.

9. The adjustable bending medical device according to claim 7, wherein said winding post is provided with a winding groove, said winding groove is recessed inward along a radial direction of said winding post, and said bending wire is wound in said winding groove.

10. The medical device for adjusting bending according to claim 7, wherein a bending wire fixing component for fixing the bending wire on the winding post is arranged on the winding post, the bending wire fixing component comprises a bending wire fixing component and a fixing component clamping groove arranged on the winding post, the fixing component clamping groove corresponds to the bending wire fixing component in size, the bending wire fixing component is inserted into the fixing component clamping groove, and the bending wire is connected with the bending wire fixing component.

11. The adjustable bending medical device according to claim 7, wherein the number of the worm gears of the winding post is two, the two worm gears are located at two ends of the winding post, the 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 gears at one ends of the two winding posts.

12. The adjustable bend medical device of claim 7, wherein the transmission member further comprises an idler gear disposed between the knob and the gear.

13. The adjustable bend medical device of claim 12, wherein said number of gears is two, two of said gears being connected to said worm at opposite ends of said worm, said idler gear being in mesh with both of said gears.