Adjustable bend sheath

Abstract

The application provides an adjustable bending sheath, which comprises a tube body, a bending traction wire, a handle shell, a fine adjustment assembly and a coarse adjustment assembly arranged in the handle shell from the distal end to the proximal end of the tube body, the coarse adjustment assembly comprises a coarse adjustment roller and a coarse adjustment shaft which can be synchronously rotated, and the coarse adjustment shaft is in frictional locking fit with the handle shell, the fine adjustment assembly comprises a fine adjustment roller and a cam shaft which can be synchronously rotated, the cam shaft has a cam portion which protrudes from the fine adjustment roller, the distal end of the bending traction wire is connected with the distal end of the tube body, and the proximal end of the bending traction wire is inserted into the handle shell and connected with the coarse adjustment shaft, the coarse adjustment shaft can wind or release the bending traction wire when the coarse adjustment roller rotates, the cam portion is located on one side of the bending traction wire, the distance between the cam portion and the bending traction wire gradually decreases during the winding process of the bending traction wire, and the cam portion can press or release the bending traction wire when the fine adjustment roller rotates, so that the bending can be adjusted quickly and with high precision, and the operation is labor-saving and convenient.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an adjustable bendable sheath. Background Technology

[0002] Catheters are essential auxiliary instruments in percutaneous interventional procedures. They provide a channel for the guidewire and, by adjusting the orientation of a pre-shaped catheter, direct the distal end towards the target vessel inlet, facilitating guidewire insertion. Adjustable bending sheaths, on the other hand, allow the distal end to bend at different angles towards the target vessel inlet via a handle, thus adapting to individual differences in human anatomy. During the procedure, the operator typically needs to repeatedly bend the distal end of the adjustable bending sheath according to its relative shape and position to the target vessel, using the handle to find a suitable angle before locking the bending angle to maintain the desired curvature. Finally, the guidewire is manipulated proximally to guide it along the catheter body into the target vessel.

[0003] However, the existing adjustable bending sheath handles have relatively complex bending drive and locking mechanisms, resulting in heavy handles that are not conducive to long-term operation. At the same time, locking the catheter in a bent state requires the cooperation of both hands and the corresponding locking mechanism must be precisely engaged to lock, resulting in low bending accuracy and the inability to achieve true instant locking. In addition, the bending handle is too long, resulting in redundant ineffective length outside the body.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable bending sheath that allows for rapid and high-precision bending via coarse and fine adjustment rollers, and instant locking of the bending state through friction locking. This enables efficient and high-precision bending, and allows for bending and locking with one hand, making operation labor-saving, convenient, and suitable for long-term use.

[0006] To solve the above-mentioned technical problems, embodiments of the present invention provide an adjustable bending sheath, comprising: a tube body, a bending traction wire, and a handle housing; the proximal end of the tube body extends into the handle housing; fine adjustment components and coarse adjustment components are arranged sequentially from the distal end of the tube body to the proximal end within the handle housing;

[0007] The coarse adjustment component includes: a coarse adjustment roller and a coarse adjustment wheel shaft. The coarse adjustment roller is connected to the coarse adjustment wheel shaft. The coarse adjustment roller is partially exposed outside the handle housing and can rotate synchronously with the coarse adjustment wheel shaft. The coarse adjustment wheel shaft is frictionally locked to the handle housing.

[0008] The fine-tuning assembly includes a fine-tuning roller and a camshaft. The fine-tuning roller is connected to the camshaft. A portion of the fine-tuning roller is exposed outside the handle housing and can rotate synchronously with the camshaft. The camshaft has a cam portion that protrudes from the fine-tuning roller.

[0009] The distal end of the bending traction wire is connected to the distal end of the tube body, and its proximal end passes into the handle housing and is connected to the coarse adjustment wheel shaft; the coarse adjustment wheel shaft can retract or release the bending traction wire when it rotates with the coarse adjustment roller; the cam part is located on one side of the bending traction wire, and the distance between the bending traction wire and the cam part gradually decreases during the retraction process; the cam part can bend or release the bending traction wire when it rotates with the fine adjustment roller.

[0010] As one embodiment, the handle housing includes a Y-shaped main handle housing and a support handle housing. The distal end of the main handle housing is connected to the proximal end of the tube body. The main handle housing and the support handle housing are in communication. The coarse adjustment component and the fine adjustment component are disposed in the support handle housing. The bending traction wire passes through the proximal end of the tube body and enters the support handle housing and is connected to the coarse adjustment wheel shaft.

[0011] Optionally, the handle housing includes a first housing and a second housing, which are snapped or fastened together to form the handle housing.

[0012] As one embodiment, the coarse adjustment wheel shaft includes an integrally connected winding section, connecting section and damping section. The connecting section passes into the coarse adjustment roller and engages with the coarse adjustment roller circumferentially. A friction locking groove is formed in the handle housing. The damping section extends into the friction locking groove and engages with the friction locking groove in a friction locking fit.

[0013] Optionally, the coarse adjustment wheel shaft is a stepped shaft, the connecting section and the damping section have the same diameter, and the diameter of the winding section is larger than the diameter of the connecting section;

[0014] Optionally, the coarse adjustment assembly further includes an elastic friction locking tube sleeved on the damping section, wherein the inner wall of the friction locking groove is tightly fitted with the outer peripheral wall of the elastic friction locking tube and frictionally locked.

[0015] Optionally, the elastic friction locking tube is a silicone tube.

[0016] As one embodiment, the coarse adjustment assembly further includes a clamping block. The winding segment has a traction wire channel with an inlet and an outlet. The winding segment has an axially extending clamping groove at the outlet of the traction wire channel. The bending traction wire enters from the inlet of the traction wire channel, exits from the outlet of the traction wire channel, passes around the clamping block pressed into the clamping groove, and then enters from the outlet and is clamped and fixed to the winding segment.

[0017] Optionally, the clamping block is also fixed to the winding segment by adhesive.

[0018] As an example, the winding segment is also provided with a limiting block that cooperates with the handle housing. The limiting block is used to restrict the coarse adjustment roller from rotating in the limiting direction. When the bending traction wire is in the released state and the coarse adjustment roller rotates in the limiting direction, the bending traction wire moves away from the cam portion.

[0019] As an example, the inlet and outlet of the traction wire channel are located at the two ends of the diameter direction of the winding segment, and when the bending traction wire is in a relaxed state, the inlet of the traction wire channel is located in the middle position of the handle housing.

[0020] As one embodiment, one of the shaft hole of the coarse adjustment roller and the connecting section of the coarse adjustment wheel shaft is recessed with a first groove extending in the axial direction, and the other is protruded with a first protrusion extending in the axial direction. The coarse adjustment roller and the coarse adjustment wheel shaft are circumferentially engaged through the first groove and the first protrusion.

[0021] As one embodiment, one of the shaft hole of the fine-tuning roller and the camshaft is recessed with a second groove extending axially, and the other is protruded with a second protrusion extending axially. The fine-tuning roller and the camshaft are circumferentially engaged through the second groove and the second protrusion.

[0022] As one embodiment, the cam portion is in the form of a rounded rectangle or a rounded trapezoid.

[0023] As one embodiment, the distal end of the tube body is provided with an anchoring ring, and the peripheral wall of the tube body is provided with a traction wire cavity extending along the axial direction. The distal end of the bending traction wire is fixedly connected to the anchoring ring, and the proximal end moves out of the traction wire cavity and is connected to the coarse adjustment wheel shaft.

[0024] Optionally, the anchoring ring is fixed in the inner cavity of the distal end of the tube;

[0025] Optionally, the handle housing has a stress tube at its distal end, and the proximal end of the tube extends into the stress tube.

[0026] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects:

[0027] By setting a coarse adjustment roller and winding the bending traction wire around the coarse adjustment roller shaft, the bending traction wire can be quickly retracted, allowing the distal end of the guide tube to be quickly adjusted to the required bending angle or close to the required bending angle. At the same time, by setting a fine adjustment roller and positioning the cam part of the cam shaft on one side of the bending traction wire, and maintaining a certain distance between the cam part and the bending traction wire when the bending traction wire is in the released state, the bending traction wire gradually moves closer to the cam part during the winding and retraction process. When the cam part rotates with the fine adjustment roller, it can bend or release the bending traction wire, thereby finely adjusting the retraction length of the bending traction wire to accurately adjust the bending angle of the distal end of the guide tube. Furthermore, the coarse adjustment component and the handle housing are frictionally locked, and the coarse adjustment roller stops and locks immediately, allowing bending and locking to be performed with one hand. The operation is very convenient, and the simple structure reduces the weight of the handle, which is beneficial for long-term operation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It is understood that the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the adjustable bending sheath provided by the present invention;

[0030] Figure 2 for Figure 1 The diagram shows the exploded structure of the adjustable bendable sheath.

[0031] Figure 3 for Figure 1 A three-dimensional structural diagram showing the installation method of the coarse adjustment component of the adjustable curved sheath and the handle housing;

[0032] Figure 4 for Figure 1 A cross-sectional schematic diagram showing the installation method of the coarse adjustment component of the adjustable curved sheath and the handle housing.

[0033] Figure 5 for Figure 1 The diagram shows the assembly structure of the coarse adjustment component and the bending traction wire of the adjustable bending sheath.

[0034] Figure 6 for Figure 1 A schematic diagram of the coarse adjustment roller of the adjustable curved sheath shown;

[0035] Figure 7 for Figure 1A schematic diagram of the coarse adjustment wheel shaft of the adjustable curved sheath shown;

[0036] Figure 8 for Figure 1 A schematic diagram of the connection structure between the coarse adjustment wheel shaft and the bending traction wire of the adjustable bending sheath from one perspective.

[0037] Figure 9 for Figure 1 The diagram shows another perspective of the connection structure between the coarse adjustment wheel shaft and the bending traction wire of the adjustable bending sheath.

[0038] Figure 10 for Figure 1 A schematic diagram of the camshaft of the adjustable curved sheath shown;

[0039] Figure 11 for Figure 1 The diagram shows the structural structure of the adjustable bendable sheath.

[0040] Figure 12 for Figure 1 The diagram shows the initial state of the handle before the adjustable bending sheath.

[0041] Figure 13 for Figure 1 The diagram shows the structure of the adjustable curved sheath after coarse adjustment of the handle.

[0042] Figure 14 for Figure 1 The diagram shows the structure of the fine-tuning handle of the adjustable curved sheath.

[0043] In the diagram: 1. Tube body; 11. Bending traction wire; 12. Anchor ring; 2. Handle housing; 21. Main handle housing; 22. Support handle housing; 23. First housing; 24. Second housing; 25. Friction locking groove; 3. Coarse adjustment assembly; 31. Coarse adjustment roller; 311. Coarse adjustment shaft hole; 321. First groove; 32. Coarse adjustment wheel shaft; 321. Winding section; 3211. Traction wire channel; 3212. Inlet; 3213. Clamping block; 3214. Limiting block; 322. Connecting section; 3221. First protrusion; 323. Damping section; 324. Elastic friction locking tube; 4. Fine adjustment assembly; 41. Fine adjustment roller; 42. Camshaft; 421. Cam part; 422. Second protrusion; 5. Stress tube; 6. Hemostatic valve. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0045] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] It should be noted that, unless otherwise explicitly stated, the terms “connected” and “linked” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components.

[0047] In the description of this invention, it should be noted that in the field of interventional medical devices, the proximal end refers to the end closer to the operator, while the distal end refers to the end farther from the operator. The above definitions are for ease of expression only and should not be construed as limiting the invention.

[0048] Please see Figures 1-4 As shown, Embodiment 1 of the present invention provides an adjustable bending sheath, which can be used to provide access for interventional devices such as guidewires. The adjustable bending sheath of this embodiment includes: a sheath body 1, an adjustable traction wire 11, and a handle housing 2. Within the handle housing 2, from the distal end of the sheath body 1, a fine adjustment component 4 and a coarse adjustment component 3 are sequentially arranged.

[0049] The coarse adjustment component 3 includes a coarse adjustment roller 31 and a coarse adjustment shaft 32. The coarse adjustment roller 31 is connected to the coarse adjustment shaft 32. Part of the coarse adjustment roller 31 is exposed outside the handle housing 2 and can rotate synchronously with the coarse adjustment shaft 32 inside the handle housing 2. The coarse adjustment shaft 32 and the handle housing 2 are frictionally locked together, so that the coarse adjustment roller can stop and lock instantly without additional operation and can accurately lock the position of the coarse adjustment roller, thereby accurately locking the bending state of the distal end of the tube 11. The coarse adjustment roller 31 can be controlled by the thumb and middle finger, while the other fingers control the handle body, which facilitates one-handed operation.

[0050] The fine adjustment component 4 includes a fine adjustment roller 41 and a camshaft 42. The fine adjustment roller 41 is connected to the camshaft 42. The fine adjustment roller 41 is partially exposed outside the handle housing 2 and can rotate synchronously with the camshaft 42 inside the handle housing 2. The camshaft 42 has a cam portion 421 protruding from the fine adjustment roller 41.

[0051] The distal end of the bending traction wire 11 is connected to the distal end of the tube body 1, and its proximal end passes through the handle housing and is connected to the coarse adjustment wheel shaft 32. The coarse adjustment wheel shaft 32 can retract or release the bending traction wire 11 as it rotates with the coarse adjustment roller 31. By rotating the coarse adjustment roller 31 to wind the bending traction wire 11 onto the coarse adjustment wheel shaft 32, or by quickly releasing the bending traction wire 11 wound onto the coarse adjustment wheel shaft 32, the length of retraction or release of the bending traction wire can be quickly adjusted to rapidly adjust the degree of bending at the distal end of the tube body 11, so that the degree of bending at the distal end of the tube body 11 meets the requirements or approaches the required bending angle.

[0052] The cam portion 421 is located on one side of the bending traction wire 11, and the distance between the bending traction wire 11 and the cam portion 421 gradually decreases during the retraction process. The cam portion 421 is located on one side of the bending traction wire 11 and has a certain distance from it, so that interference with the bending traction wire 11 can be avoided when it is retracted by the coarse adjustment roller 31, allowing the bending traction wire 11 to be retracted freely. Simultaneously, during the retraction process, the distance between the bending traction wire 11 and the cam portion 421 gradually decreases, meaning the bending traction wire 11 gradually approaches the cam portion 421 and eventually contacts it. When the cam portion 421 rotates with the fine adjustment roller 41, it can bend or release the bending traction wire 11. The cam portion 421 has a non-circular structure, so when the cam portion 421 rotates, it can continuously push against the bending traction wire 11. Since the proximal end of the bending traction wire 11 is fixed to the coarse adjustment wheel shaft 32 and cannot move, when the cam portion 421 pushes against the bending traction wire 11 to one side, it can continuously bend the bending traction wire. Alternatively, when the cam portion 421 retracts and continuously releases the bending traction wire 11, the degree of bending gradually decreases. This allows the bending traction wire to be retracted at a lower speed, enabling more precise control of the retraction amount (i.e., retraction length) of the bending traction wire 11. This, in turn, precisely controls the bending angle change at the distal end of the tube body 11, facilitating the achievement of the required bending precision. It is understood that the diameter of the coarse adjustment roller 31 can be larger than the diameter of the fine adjustment roller 41, and the fine adjustment roller 41 can be located at the top or bottom of the handle housing 2.

[0053] In some examples, the handle housing 2 may include a Y-shaped main handle housing 21 and a support handle housing 22. The main handle housing 21 may be coaxially arranged with the tube body 1, with its distal end connected to the proximal end of the tube body 11. The main handle housing 21 and the support handle housing 22 are connected, and the support handle housing 22 may extend outward from the side wall of the main handle housing 21 at an appropriate position in the axial direction and extend obliquely towards the proximal end of the main handle housing 21. The coarse adjustment assembly 3 and the fine adjustment assembly 4 are disposed within the support handle housing 22. The bending traction wire 11 passes through the proximal end of the tube body 1 and enters the support handle housing, connecting with the coarse adjustment wheel shaft 32. The main handle housing 21 and the support handle housing 22 provide space for the bending traction wire 11 to move, facilitating flexible retrieval and release of the bending traction wire. By placing the bending mechanism (i.e., coarse adjustment component 3 and fine adjustment component 4) of the tube body 11 inside the handle housing 22, the length of the handle housing 11 can be significantly shortened compared to placing the bending mechanism inside the handle extending along the length of the tube body 11. Furthermore, during operation, the hand primarily controls the bending mechanism on the side, which does not obstruct operation and makes it easier to operate. It is understood that this application does not impose specific limitations on the shape of the handle housing, as long as the bending function of the bending mechanism can be realized.

[0054] By way of example and not limitation, the handle housing 2 may include a first housing 23 and a second housing 24, which may be snapped or fastened together to form the handle housing 2, thereby facilitating the installation of the bending mechanism.

[0055] In some examples, please refer to Figures 5-9 As shown, the coarse adjustment wheel shaft 3 may include an integrally connected winding section 321, connecting section 322, and damping section 323. The connecting section 322 passes into the coarse adjustment roller 31 and engages circumferentially with the coarse adjustment roller 31, causing the coarse adjustment wheel shaft 32 to rotate together with the coarse adjustment roller. The winding section 321 protrudes from the coarse adjustment roller 31 to wind the bending traction wire onto it. The diameter of the winding section 321 is smaller than the diameter of the coarse adjustment roller 31, so that when the coarse adjustment roller 31 and the winding section 321 rotate by the same angle, the arc length traversed by the former is greater than that traversed by the latter. This allows for more precise control of the bending angle through a single-stage reduction ratio. Furthermore, since the lever arm of the bending traction wire is less than the lever arm of the finger controlling the rotation of the coarse adjustment roller 31, the operation is less strenuous.

[0056] A friction locking groove 25 is formed inside the handle housing 2, and the damping section 323 extends into the friction locking groove 25 and engages with the friction locking groove in a friction locking fit. A rotating groove can be formed inside the handle housing 2, and the outer end of the winding section 321 can be partially accommodated in the rotating groove, so that the coarse adjustment component 3 can be reliably installed inside the handle housing 2 and can rotate inside the handle housing 2.

[0057] Specifically, the coarse adjustment wheel shaft 32 can be a stepped shaft, the connecting section 322 and the damping section 323 have the same diameter, and the diameter of the winding section 321 can be larger than the diameter of the connecting section 322.

[0058] In some examples, the coarse adjustment roller 31 has a recessed first groove 312 extending axially in its shaft hole 311, and the connecting section 322 of the coarse adjustment wheel shaft 32 has a protruding first protrusion 3221 extending axially. The coarse adjustment roller 31 and the coarse adjustment wheel shaft 32 are circumferentially engaged through the first groove 312 and the first protrusion 3221. In other examples, the coarse adjustment roller 31 has a protruding first protrusion extending axially in its shaft hole 311, and the connecting section 322 of the coarse adjustment wheel shaft 32 has a recessed first groove extending axially. The coarse adjustment roller 31 and the coarse adjustment wheel shaft 32 are circumferentially engaged through the corresponding first groove and first protrusion.

[0059] The coarse adjustment assembly 3 may further include an elastic friction locking tube 324 sleeved on the damping section 323. The inner wall of the friction locking groove 25 is tightly fitted with the outer peripheral wall of the elastic friction locking tube 324 and frictionally locked. For example, the elastic friction locking tube 324 may be a silicone tube, which is interference-fitted with the damping section 323, so that the damping section 323 and the silicone tube rotate or stop synchronously. The friction locking groove 25 may be a cylindrical groove adapted to the damping section 323, and a silicone ring may be fixed on the inner wall of the friction locking groove 25. The inner diameter of the silicone ring may be slightly smaller than the outer diameter of the elastic friction locking tube 324. When the first housing 23 and the second housing 24 are fixedly connected, the silicone ring can hold the elastic friction locking tube 324 tightly, forming a large rotational resistance on the elastic friction locking tube 324. This rotational resistance is greater than the rotational driving force generated by the elastic recovery of the tube body 11 on the coarse adjustment wheel shaft 32, thereby locking the coarse adjustment roller 31 and enabling the coarse adjustment roller 31 to achieve the ability to stop and lock immediately. It is understood that any other feasible friction fit structure can also be used to achieve the friction locking fit between the handle housing 2 and the coarse adjustment wheel axle 32, and no specific restrictions are made here.

[0060] The coarse adjustment assembly 3 may also include a clamping block 3213. The winding section 321 of the coarse adjustment shaft 32 has a traction wire channel 3211, which has an inlet 3212 and an outlet. The winding section 321 has an axially extending clamping groove at the outlet of the traction wire channel 3211. The bending traction wire 11 enters through the inlet 3212 of the traction wire channel 3211, exits through the outlet, passes around the clamping block 3213 pressed into the clamping groove, and then enters again from the outlet, where it is clamped and fixed to the winding section 321. This fixes the bending traction wire 11 to the coarse adjustment shaft 32, and the greater the tension on the bending traction wire 11, the more secure the fixation to the winding section 321. In some examples, the clamping block 3213 can also be fixed to the winding section 321 with adhesive, thereby reliably fixing the bending traction wire 11 to the coarse adjustment shaft 32. It is understandable that the bending traction wire can be fixed to the winding segment in any feasible way, and no specific restrictions are imposed here.

[0061] The winding segment 321 is also provided with a limiting block 3214 that cooperates with the handle housing 2. The limiting block 3214 is used to limit the coarse adjustment roller 31 from rotating in the limiting direction. When the bending traction wire 11 is in the released state and the coarse adjustment roller 31 rotates in the limiting direction, the bending traction wire 11 moves away from the cam part 421, thereby playing a foolproof role, so that the coarse adjustment roller 31 can only rotate in the opposite direction to the limiting direction when bending begins, as detailed below. Figures 12-14 As shown, the coarse adjustment roller 31 rotates counterclockwise when it starts to adjust the bend, but cannot rotate clockwise (the restricted direction).

[0062] It is worth mentioning that the inlet 3212 and outlet of the traction wire channel 3211 are located at the two ends of the diameter direction of the winding segment 321, and when the bending traction wire 11 is in the relaxed state, the inlet 3212 of the traction wire channel 3211 is located in the middle position of the handle housing. At this time, the bending traction wire 11 can be parallel to the center line of the handle housing 11.

[0063] Please see Figure 10 As shown, the camshaft 42 is integrally connected to the cam portion 421. The cam portion 421 can be a rounded rectangle or a rounded trapezoid. It is understood that the cam portion 421 can adopt any feasible shape, as long as it can push or release the bending traction wire during rotation. The fine-tuning roller 41 has a recessed second groove extending axially within its shaft hole, and the camshaft 42 has a protruding second protrusion extending axially on its surface. The fine-tuning roller 41 and the camshaft 42 are circumferentially engaged through the second groove and the second protrusion 422, allowing the camshaft 42 and the fine-tuning roller 41 to rotate together. In other examples, the fine-tuning roller 41 has a protruding second protrusion extending axially within its shaft hole, and the camshaft 42 has a recessed second groove extending axially on its surface. The fine-tuning roller 41 and the camshaft 42 are circumferentially engaged through the corresponding second groove and the second protrusion 422.

[0064] Please see Figure 11 As shown, the distal end of the pipe body 1 is provided with an anchoring ring 12, and the distal end of the pipe body 1 may have a bending section. The anchoring ring 12 can be fixed to the distal end of the bending section. The peripheral wall of the pipe body 1 is provided with a traction wire cavity extending axially. The distal end of the bending traction wire 11 is fixedly connected to the anchoring ring 12, and the proximal end moves out of the traction wire cavity and is connected to the coarse adjustment wheel shaft 42. Exemplarily, the anchoring ring 12 can be fixed in the inner cavity of the distal end of the pipe body 1, or it can be fixedly set in a groove in the outer peripheral wall of the distal end of the pipe body 11. The traction wire cavity can also adopt other forms that meet any bending requirements, such as spirally extending along the peripheral wall of the pipe body 1. The bending section is made of an elastic material and has a certain degree of elasticity. When the tension on the bending traction wire is released, the bending section can return to a straight pipe by its own elasticity.

[0065] In some examples, the distal end of the handle housing 2 is provided with a stress tube 5, and the proximal end of the tube body 1 is inserted into the stress tube 5. The proximal end of the handle housing 2 can also be connected to a hemostatic valve 6.

[0066] Combination Figures 12-14 As shown, the adjustable bending sheath of this invention is used in the following way:

[0067] When the adjustable bending sheath is straight, the bending traction wire 11 is in the released state. At this time, the bending traction wire 11 is not wound on the winding segment 321 of the coarse adjustment wheel shaft. The handle housing (lower housing) and the limiting block 3214 of the winding segment 321 cooperate to prevent the coarse adjustment roller from rotating clockwise (in the cross-sectional view). At this time, the coarse adjustment roller 31 can rotate counterclockwise, as... Figure 12 As shown.

[0068] When the coarse adjustment roller 31 is rotated counterclockwise, the bending traction wire 11 is wound around the winding segment 321 of the coarse adjustment wheel shaft, and the bending segment at the distal end of the adjustable sheath bends under the tension of the bending traction wire. After the finger releases the coarse adjustment roller 31, it rubs against the handle housing and locks in place. The bending traction wire 11 is then wound statically around the coarse adjustment wheel shaft relative to the handle housing, and the bending state of the distal end of the tube is locked. When the coarse adjustment roller 31 is rotated counterclockwise by a certain angle, as... Figure 13 As shown, when the tube reaches a large bending angle, the limiting block 3214, restricted by the upper shell, can stop rotating counterclockwise and maximize the bending angle. When the coarse adjustment roller 31 is rotated clockwise, the bending traction wire 11 is released from the winding section and can return to its original position. Figure 12 As shown in the initial state, the distal end of the adjustable bendable sheath can return to a straight tube shape.

[0069] like Figure 14 As shown, when precise adjustment of the bending angle is required, the fine adjustment roller 41 can be rotated. After the bending traction wire 11 is squeezed by the cam part 421, it can form a "V" shaped bend, so that the bending traction wire produces a smaller amount of retraction. When the cam part 421 is retracted, the release length of the bending traction wire 11 can also be controlled more precisely, thereby achieving high-precision control of the bending angle at the far end of the tube.

[0070] Compared with the prior art, this invention achieves rapid retrieval of the bending traction wire by setting a coarse adjustment roller and winding the bending traction wire around the coarse adjustment roller shaft. This allows for quick adjustment of the distal end of the guide tube to the required bending angle or close to the required bending angle. Simultaneously, by setting a fine adjustment roller and positioning the cam portion of the cam shaft on one side of the bending traction wire, and maintaining a certain distance between the cam portion and the bending traction wire when the bending traction wire is in the released state, the bending traction wire gradually approaches the cam portion during the winding and retrieval process. When the cam portion rotates with the fine adjustment roller, it can bend or release the bending traction wire, thereby finely adjusting the retrieval length of the bending traction wire to accurately adjust the bending angle of the distal end of the guide tube. Furthermore, the coarse adjustment component and the handle housing are frictionally locked, allowing the coarse adjustment roller to stop and lock instantly. This enables bending and locking with one hand, making operation very convenient. At the same time, the simple structure reduces the weight of the handle, which is beneficial for long-term operation.

[0071] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. An adjustable bending sheath, characterized in that, include: The tube body, the bending traction wire, and the handle housing; the proximal end of the tube body extends into the handle housing; fine adjustment components and coarse adjustment components are arranged sequentially from the far end of the tube body to the near end inside the handle housing; The coarse adjustment component includes: a coarse adjustment roller and a coarse adjustment wheel shaft. The coarse adjustment roller is connected to the coarse adjustment wheel shaft. The coarse adjustment roller is partially exposed outside the handle housing and can rotate synchronously with the coarse adjustment wheel shaft. The coarse adjustment wheel shaft is frictionally locked to the handle housing. The fine-tuning assembly includes a fine-tuning roller and a camshaft. The fine-tuning roller is connected to the camshaft. A portion of the fine-tuning roller is exposed outside the handle housing and can rotate synchronously with the camshaft. The camshaft has a cam portion that protrudes from the fine-tuning roller. The distal end of the bending traction wire is connected to the distal end of the tube body, and its proximal end passes into the handle housing and is connected to the coarse adjustment wheel shaft; the coarse adjustment wheel shaft can retract or release the bending traction wire when it rotates with the coarse adjustment roller; the cam part is located on one side of the bending traction wire, and the distance between the bending traction wire and the cam part gradually decreases during the retraction process; the cam part can bend or release the bending traction wire when it rotates with the fine adjustment roller.

2. The adjustable bending sheath according to claim 1, characterized in that, The handle housing includes a Y-shaped main handle housing and a support handle housing. The distal end of the main handle housing is connected to the proximal end of the tube body. The main handle housing and the support handle housing are in communication. The coarse adjustment component and the fine adjustment component are disposed inside the support handle housing. The bending traction wire passes through the proximal end of the tube body and enters the support handle housing and is connected to the coarse adjustment wheel shaft.

3. The adjustable bending sheath according to claim 1, characterized in that, The handle housing includes a first housing and a second housing, which are snapped or fastened together to form the handle housing.

4. The adjustable bending sheath according to claim 1, characterized in that, The coarse adjustment wheel shaft includes an integrally connected winding section, connecting section, and damping section. The connecting section passes through the coarse adjustment roller and engages with it circumferentially. A friction locking groove is formed inside the handle housing. The damping section extends into the friction locking groove and engages with it in a friction locking engagement.

5. The adjustable bending sheath according to claim 4, characterized in that, The coarse adjustment wheel shaft is a stepped shaft, the connecting section and the damping section have the same diameter, and the diameter of the winding section is larger than the diameter of the connecting section.

6. The adjustable bending sheath according to claim 4, characterized in that, The coarse adjustment assembly also includes an elastic friction locking tube sleeved on the damping section, wherein the inner wall of the friction locking groove is tightly fitted with the outer peripheral wall of the elastic friction locking tube and frictionally locked.

7. The adjustable bending sheath according to claim 6, characterized in that, The elastic friction locking tube is a silicone tube.

8. The adjustable bending sheath according to claim 4, characterized in that, The coarse adjustment assembly also includes a clamping block. The winding segment has a traction wire channel with an inlet and an outlet. The winding segment has an axially extending clamping groove at the outlet of the traction wire channel. The bending traction wire enters from the inlet of the traction wire channel, exits from the outlet of the traction wire channel, passes around the clamping block pressed into the clamping groove, and then enters from the outlet and is clamped and fixed to the winding segment.

9. The adjustable bending sheath according to claim 8, characterized in that, The clamping block is also fixed to the winding segment with glue.

10. The adjustable bending sheath according to claim 8, characterized in that, The winding segment is also provided with a limiting block that cooperates with the handle housing. The limiting block is used to restrict the coarse adjustment roller from rotating in the limiting direction. When the bending traction wire is in the released state and the coarse adjustment roller rotates in the limiting direction, the bending traction wire moves away from the cam part.

11. The adjustable bending sheath according to claim 10, characterized in that, The inlet and outlet of the traction wire channel are located at the two ends of the diameter of the winding segment, and when the bending traction wire is in a relaxed state, the inlet of the traction wire channel is located in the middle of the handle housing.

12. The adjustable bending sheath according to claim 4, characterized in that, One of the shaft hole of the coarse adjustment roller and the connecting section of the coarse adjustment wheel shaft is recessed with a first groove extending in the axial direction, and the other is protruded with a first protrusion extending in the axial direction. The coarse adjustment roller and the coarse adjustment wheel shaft are circumferentially engaged through the first groove and the first protrusion.

13. The adjustable bending sheath according to claim 1, characterized in that, The fine-tuning roller and the camshaft are respectively provided with a second groove extending axially in one of their shaft holes and a second protrusion extending axially in the other. The fine-tuning roller and the camshaft are circumferentially engaged through the second groove and the second protrusion.

14. The adjustable bending sheath according to claim 1, characterized in that, The cam portion is in the shape of a rounded rectangle or a rounded trapezoid.

15. The adjustable bending sheath according to claim 1, characterized in that, An anchoring ring is provided at the distal end of the tube body, and a traction wire cavity extending axially is provided on the peripheral wall of the tube body. The distal end of the bending traction wire is fixedly connected to the anchoring ring, and the proximal end moves out of the traction wire cavity and is connected to the coarse adjustment wheel shaft.

16. The adjustable bending sheath according to claim 15, characterized in that, The anchoring ring is fixed in the inner cavity of the distal end of the tube.

17. The adjustable bending sheath according to claim 15, characterized in that, The handle housing is provided with a stress tube at the distal end, and the proximal end of the tube is inserted into the stress tube.

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