Adjustable bend sheath

Abstract

The present application relates to the technical field of interventional medical instruments, and provides a bend-adjustable sheath tube, which comprises a sheath tube, a shell arranged at the proximal end of the sheath tube, a first driving mechanism and a second driving mechanism arranged in the shell, and a first traction wire, a second traction wire and a third traction wire, the proximal end of the first traction wire is connected with the first driving mechanism, the proximal end of the second traction wire and the proximal end of the third traction wire are both connected with the second driving mechanism, the distal ends of the three traction wires are all connected with the distal end of the sheath tube, and the driving mechanism is used for pulling and releasing the traction wire connected therewith to change the bending state of the sheath tube. Through the bend-adjustable sheath tube provided by the present application, during the edge-to-edge repair operation of the mitral valve in the left atrium, the sheath tube can be bent in multiple angles and directions, that is, cross-plane bending can be realized, so that the bending direction is not limited in one plane, and thus the accurate capture of the valve leaflet by the instrument is realized, and the operation demand of doctors and patients on the complex internal structure of the heart is met.

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] Mitral valve disease is a common condition among the elderly, encompassing two main types: mitral regurgitation and mitral stenosis, with mitral regurgitation being the most prevalent. Moderate to severe mitral regurgitation requires intervention. Traditional surgical treatment involves open-heart surgery, where the heart is opened under cardiopulmonary bypass to repair or replace the valve. However, high-risk patients often cannot tolerate this procedure. In recent years, interventional therapy has emerged as a promising option for high-risk patients with mitral regurgitation. This approach typically involves delivering instruments to the affected area via a sheath to repair or replace the valve.

[0003] During edge-to-edge mitral valve repair surgery within the left atrium, the sheath needs to be bent at multiple angles and directions to achieve precise capture of the valve leaflets. However, current adjustable sheaths are generally unidirectional or bidirectional, with the bending direction always within a single plane. They cannot achieve cross-plane bending, which is far from meeting the needs of doctors and patients, and has significant limitations compared to the complex internal structure of the heart. Summary of the Invention

[0004] Based on this, the present invention provides an adjustable bending sheath to solve the problem that existing adjustable bending sheaths on the market cannot achieve cross-plane bending, and compared with the complex internal structure of the heart, they are far from meeting the needs of doctors and patients, and have great limitations.

[0005] To solve the above-mentioned technical problems, this invention proposes an adjustable bending sheath, comprising a sheath, a housing disposed at the proximal end of the sheath, a first driving mechanism and a second driving mechanism disposed within the housing, and a first traction wire, a second traction wire, and a third traction wire. The proximal end of the first traction wire is connected to the first driving mechanism, and the proximal ends of the second and third traction wires are both connected to the second driving mechanism. The distal ends of the first, second, and third traction wires are all connected to the distal end of the sheath. The first and second driving mechanisms are respectively used to pull and release the traction wires connected thereto to change the bending state of the sheath.

[0006] In one embodiment, the first drive mechanism includes a first drive ring partially exposed above the housing, and the second drive mechanism includes a second drive ring partially exposed above the housing. The first drive ring is located near the distal end of the housing, and the second drive ring is located near the proximal end of the housing. The proximal ends of the first traction wire, the second traction wire, and the third traction wire are all located between the distal end of the first drive ring and the proximal end of the second drive ring.

[0007] In one embodiment, the distal ends of the first traction wire, the second traction wire, and the third traction wire are located at different positions on the same circumference of the same radial plane at the distal end of the sheath.

[0008] In one embodiment, the adjustable bending sheath further includes a rotating mechanism connected to the sheath, the first driving mechanism, and the second driving mechanism, the rotating mechanism being able to simultaneously drive the sheath, the first driving mechanism, and the second driving mechanism to rotate coaxially relative to the housing.

[0009] In one embodiment, the rotating mechanism includes a rotating component, a fixed frame, an inner sheath reinforcing tube, and two inner sheath guide rods. The sheath tube passes through the inner sheath reinforcing tube and is fixedly connected to it. Both the inner sheath reinforcing tube and the inner sheath guide rods are connected to the rotating component. The inner sheath reinforcing tube passes through the first driving mechanism and is connected to the second driving mechanism. The inner sheath guide rods pass through the first driving mechanism and the fixed frame. The second driving mechanism is mounted on the fixed frame. Under the action of external force, the rotating component drives the sheath tube to rotate coaxially relative to the housing through the inner sheath reinforcing tube, and drives the first driving mechanism and the second driving mechanism to rotate coaxially relative to the housing through the inner sheath guide rods.

[0010] In one embodiment, the first driving mechanism includes a first active member and a first slider linked to the first active member. The first slider is connected to the proximal end of the first traction wire and is sleeved on the inner sheath reinforcing tube. The first slider can move along the inner sheath reinforcing tube under the drive of the first active member, so that the first slider can pull and release the first traction wire.

[0011] In one embodiment, the first slider is sleeved on the two inner sheath guide rods, and the rotating member rotates relative to the shell under the action of external force and drives the sheath tube to rotate coaxially through the inner sheath reinforcing tube, and drives the first slider and the first active member to rotate coaxially through the inner sheath guide rods.

[0012] In one embodiment, the outer surface of the first slider is threaded, the first driving member is a sleeve with a threaded inner surface, the first slider is placed inside the sleeve and threadedly connected to the sleeve, and the first slider moves along the axial direction of the sleeve when the sleeve rotates.

[0013] In one embodiment, the second drive mechanism includes a second driving member and two second sliders that are driven by the second driving member. The proximal ends of the second traction wire and the third traction wire are respectively connected to the two second sliders. The two second sliders move in opposite directions under the drive of the second driving member, so that when one second slider pulls the traction wire connected to it, the other second slider releases the traction wire connected to it simultaneously.

[0014] In one embodiment, two second sliders are respectively sleeved on two screws, the second sliders are threadedly connected to the screws, the two screws pass through the fixed frame, the second driving member is driven by the two screws and the two second sliders, the two inner sheath guide rods are connected to the fixed frame corresponding to the two screws, and the two second sliders are respectively sleeved on the two inner sheath guide rods to restrict the second sliders from circumferentially deflecting on the corresponding screws; when the second driving member moves relative to the shell under the action of external force and drives the two screws to rotate, the two second sliders move in opposite directions; the rotating member rotates relative to the shell under the action of external force and drives the sheath tube to rotate coaxially through the inner sheath reinforcing tube and drives the fixed frame to rotate through the inner sheath guide rod, thereby driving the second driving member, the two screws and the corresponding second slider to rotate coaxially.

[0015] In one embodiment, the second slider is threadedly connected to the screw and can achieve self-locking.

[0016] In one embodiment, the housing is provided with a viewing window.

[0017] In one embodiment, a first damping element is fixed on the housing, the first damping element abutting against the rotating element to prevent the rotating element from rotating during bending.

[0018] In one embodiment, the inner sheath reinforcing tube passes through the second active member along the axial direction of the second active member, and a second damping member is sleeved on the inner sheath reinforcing tube, the second damping member abutting against the second active member.

[0019] In one embodiment, a limiting groove is formed on the outer periphery of the inner sheath reinforcing tube, and a limiting plate is provided on the housing corresponding to the position of the limiting groove. The limiting plate cooperates with the limiting groove to axially limit the inner sheath reinforcing tube.

[0020] Compared with the prior art, the adjustable bending sheath provided by the present invention has the following beneficial effects:

[0021] The adjustable bending sheath provided by this invention achieves unidirectional bending by connecting a first driving mechanism to a first traction wire, and bidirectional bending by connecting a second driving mechanism to a second and a third traction wire. This allows the sheath to bend in three different directions. During edge-to-edge mitral valve repair surgery in the left atrium, bending can be performed first using any one driving mechanism to select a suitable angle in a plane, followed by bending using another driving mechanism, or bending can be performed simultaneously using the first and second driving mechanisms. This allows the sheath to bend at multiple angles and in multiple directions, enabling cross-plane bending and ensuring the bending direction is not limited to a single plane. This allows for precise capture of the valve leaflets by the instrument, meeting the surgical needs of doctors and patients with complex cardiac structures. Furthermore, the adjustable bending sheath provided by this invention allows a single surgeon to independently perform cross-plane bending of the sheath during edge-to-edge repair surgery, freeing up medical resources and improving the convenience of the surgical procedure. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the adjustable bending sheath provided in Embodiment 1 of the present invention;

[0023] Figure 2 This is a partial exploded structural diagram of the adjustable bending sheath provided in Embodiment 1 of the present invention;

[0024] Figure 3 This is a cross-sectional view of the adjustable bending sheath provided in Embodiment 1 of the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of A in the middle;

[0026] Figure 5 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 1 of the present invention. Figure 1 ;

[0027] Figure 6 for Figure 5 Enlarged view of B in the middle;

[0028] Figure 7 This is a schematic diagram of the combination of the adjustable bending sheath and the traction wire provided in Embodiment 1 of the present invention;

[0029] Figure 8 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 1 of the present invention. Figure 2 ;

[0030] Figure 9 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 1 of the present invention. Figure 3 ;

[0031] Figure 10 for Figure 9 Enlarged view of C;

[0032] Figure 11 This is a front view schematic diagram of the adjustable bending sheath provided in Embodiment 1 of the present invention;

[0033] Figure 12 for Figure 2 Enlarged view of D;

[0034] Figure 13 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 2 of the present invention;

[0035] Figure 14 for Figure 13 Enlarged view of E in the middle;

[0036] Figure 15 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 3 of the present invention;

[0037] Figure 16 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 4 of the present invention;

[0038] Figure 17 This is a schematic diagram of the internal structure of the adjustable bending sheath provided in Embodiment 5 of the present invention.

[0039] Explanation of reference numerals in the attached diagram:

[0040] 10. Adjustable bending sheath; 11. Housing; 12. Sheath; 13. Drive mechanism; 14. Traction wire; 15. Rotation mechanism;

[0041] 101. Hose; 102. Three-way valve; 111. Viewing window; 112. Limiting plate; 131. First drive mechanism; 132. Second drive mechanism; 141. First traction wire; 142. Second traction wire; 143. Third traction wire; 151. Rotating component; 152. Fixing frame; 153. Inner sheath reinforcing tube; 154. Inner sheath guide rod;

[0042] 1311, First driving member; 1312, First slider; 1313, First drive ring; 1321, Second driving member; 1322, Second slider; 1323, Screw; 1324, Second drive ring; 1511, First damping member; 1512, Annular groove; 1531, Second damping member; 1532, Limiting groove;

[0043] 15111, Damping ring; 15112, Damping block. Detailed Implementation

[0044] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0045] It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation. It should also be noted that the directional terms such as left, right, up, and down in this embodiment are only relative concepts or referenced to the normal use of the product, and should not be considered restrictive.

[0046] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] Additionally, it should be noted that in the field of interventional medical devices, the end of a medical device implanted in the human or animal body, or the delivery system that delivers the medical device, closer to the operator is generally referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of a medical device or delivery system are defined. "Axial direction" generally refers to the length direction of the medical device during delivery, and "radial direction" generally refers to the direction of the medical device perpendicular to its "axial direction." Based on this principle, the "axial direction" and "radial direction" of any component of a medical device are defined.

[0049] Example 1

[0050] See Figure 1 and Figure 2 As shown, this embodiment of the invention provides an adjustable bending sheath 10, which includes a housing 11, a sheath 12, at least one drive mechanism 13, and at least one traction wire 14. The housing 11 is located at the proximal end of the sheath 12, and the drive mechanism 13 is located inside the housing 11. The distal end of the traction wire 14 is connected to the distal end of the sheath 12, and the proximal end of the traction wire 14 extends into the housing 11 and is connected to the drive mechanism 13. The drive mechanism 13 is used to pull and release the traction wire 14 to achieve bending of the sheath 12. The drive mechanism 13 moves relative to the housing 11 under the action of external force, and the moving drive mechanism 13 changes the bending state of the sheath 12 during the pulling and releasing of the traction wire 14.

[0051] Specifically, the housing 11 is designed for easy gripping during operation. The housing 11 also provides protection and installation support for components such as the drive mechanism 13. The housing 11 can be formed by connecting an upper and lower housing. Furthermore, multiple reinforcing ribs (not shown) can be provided within the inner wall of the housing 11. These reinforcing ribs enhance the strength of the housing 11 and provide installation support for the components within it.

[0052] Specifically, the traction wire 14 can be connected to the distal end of the sheath tube 12 via an anchoring ring (not shown), that is, an anchoring ring is fixed at the distal end of the sheath tube 12, and then the distal end of the traction wire 14 is connected to the anchoring ring.

[0053] Specifically, the sheath 12 has a threading channel (not shown) for threading the traction wire 14 inside its side wall, which provides a dedicated channel for the traction wire 14 to ensure its smooth movement, while also providing protection to prevent it from being disturbed by the outside world.

[0054] Furthermore, the adjustable bendable sheath 10 also includes a hose 101 and a three-way valve 102. The three-way valve 102 is connected to the sheath 12 through the hose 101, so that liquid can be injected into the sheath 12 or bodily fluid can be extracted by connecting the three-way valve 102 with a syringe or other instruments.

[0055] When the number of traction wires 14 is 1, the sheath tube 12 can achieve unidirectional bending; when the number of traction wires 14 is greater than 1, the sheath tube 12 can achieve multidirectional bending.

[0056] See Figures 2-7 As shown, in one specific embodiment, there are two drive mechanisms 13 and three traction wires 14. One traction wire 14 is connected to one drive mechanism 13, and the other two traction wires 14 are connected to another drive mechanism 13. Under the action of external force, the two drive mechanisms 13 move relative to the housing 11 and respectively pull and release the traction wires 14 connected to them to change the bending state of the sheath 12. This invention is described using the example of two drive mechanisms 13 and three traction wires 14, and should not be construed as limiting. In this embodiment, the drive mechanism 13 includes a first drive mechanism 131 and a second drive mechanism 132. Preferably, the first drive mechanism 131 and the second drive mechanism 132 are independently controlled. The traction wire 14 includes a first traction wire 141, a second traction wire 142, and a third traction wire 143. The proximal end of the first traction wire 141 is connected to the first drive mechanism 131. The proximal ends of the second traction wire 142 and the third traction wire 143 are both connected to the second drive mechanism 132. The distal ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 are all connected to the distal end of the sheath 12. The first drive mechanism 131 can move relative to the housing 11 and pull and release the first traction wire 141. The second drive mechanism 132 can move relative to the housing 11 and pull and release the second traction wire 142 and the third traction wire 143, allowing the sheath 12 to bend in three different directions.

[0057] Preferably, the distal ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 are located at different positions on the same circumference of the same radial plane at the distal end of the sheath 12, with better results achieved when closer to the distal end of the sheath 12. During edge-to-edge repair surgery of the mitral, tricuspid, or aortic valve using leaflet-clamping instruments, since the leaflets are in motion, locating the distal ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 at different positions on the same circumference of the same radial plane at the distal end of the sheath 12 reduces the delay in sheath 12 bending, making the bending of the sheath 12 more precise. This allows for precise capture of the leaflets during the release of the leaflet-clamping instruments from the adjustable sheath. Of course, the distal ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 are located in different radial planes at the distal end of the sheath 12. For example, the distal end of the first traction wire 141 is located in one radial plane at the distal end of the sheath 12, and the distal ends of the second traction wire 142 and the third traction wire 143 are located in another radial plane at the distal end of the sheath 12. Alternatively, the distal ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 are respectively located in different radial planes at the distal end of the sheath 12. This embodiment of the invention is not specifically limited.

[0058] The adjustable bending sheath 10 provided by this invention achieves unidirectional bending of the sheath 12 by connecting the first drive mechanism 131 to the first traction wire 141, and bidirectional bending of the sheath 12 by connecting the second drive mechanism 132 to the second traction wire 142 and the third traction wire 143. This allows the sheath 12 to bend in three different directions. During edge-to-edge repair surgery of the mitral valve in the left atrium, the sheath 12 can be bent at a suitable angle in a plane by first adjusting it through any one drive mechanism, and then adjusted by another drive mechanism, or simultaneously adjusted by the first drive mechanism 131 and the second drive mechanism 132. This allows the sheath 12 to be bent at multiple angles and in multiple directions, that is, to achieve cross-plane bending, so that the bending direction is not limited to one plane. This enables the instrument to accurately capture the valve leaflets, meeting the surgical needs of doctors and patients for complex internal cardiac structures. Furthermore, with the adjustable bending sheath 10 provided by this invention, a single doctor can independently adjust the bending of the sheath 12 across planes during edge-to-edge repair surgery, freeing up doctor resources and improving the convenience of surgical operations.

[0059] Specifically, such as Figure 7 As shown, the distal end of the traction wire corresponding to the first drive mechanism 131 and the distal end of the traction wire corresponding to the second drive mechanism 132 are connected to mutually perpendicular axial planes at the distal end of the sheath tube 12.

[0060] Specifically, such as Figure 7As shown, the distal ends of the second traction wire 142 and the third traction wire 143 are connected to the same radial plane at the distal end of the sheath tube 12 and are symmetrically arranged. When the second drive mechanism 132 moves relative to the housing 11 under the action of external force and pulls on either the second traction wire 142 or the third traction wire 143, it can simultaneously release the other one, thereby changing the bending state of the sheath tube 12.

[0061] Understandably, the second drive mechanism 132 can pull and release the second traction wire 142 and the third traction wire 143. When the second drive mechanism 132 pulls either the second traction wire 142 or the third traction wire 143, the sheath tube 12 bends towards the side of the pulled traction wire. At the same time, the second drive mechanism 132 also simultaneously releases the other unpulled traction wire as the sheath tube 12 bends. For example, when the second drive mechanism 132 pulls the second traction wire 142, causing the distal end of the sheath tube 12 to bend towards the side where the second traction wire 142 is located, the third traction wire 143 releases its length as the sheath tube 12 bends. When the second drive mechanism 132 pulls the third traction wire 143 and causes the sheath 12 to bend toward the side where the third traction wire 143 is located, the second traction wire 142 releases its length as the sheath 12 bends. In this way, through the cooperation of the second drive mechanism 132, the second traction wire 142, and the third traction wire 143, the sheath 12 can be bent in two directions, thus achieving bidirectional bending. This fully meets the needs of interventional treatment for complex lesions such as tortuous blood vessels and variable vascular opening positions, greatly reducing the frequency of catheter adjustments and replacements required by clinical operators, making the surgery easier to perform, and also reducing the risk of complications.

[0062] See Figure 2 and Figure 8 As shown, the adjustable bending sheath 10 further includes a rotating mechanism 15. At least a portion of the rotating mechanism 15 extends into the housing 11 and the rotating mechanism 15 can rotate relative to the housing 11. The rotating mechanism 15 extending into the housing 11 is connected to the sheath 12, the first driving mechanism 131, and the second driving mechanism 132, so that the sheath 12, the first driving mechanism 131, and the second driving mechanism 132 can rotate coaxially relative to the housing 11 under the drive of the rotating mechanism 15. That is, the rotating mechanism 15 rotates relative to the housing 11 under the action of external force, while simultaneously driving the sheath 12, the first driving mechanism 131, and the second driving mechanism 132 to rotate coaxially relative to the housing 11.

[0063] The adjustable bending sheath provided by this invention connects the rotating mechanism 15 to the sheath 12, the first drive mechanism 131, and the second drive mechanism 132. This allows the rotating mechanism 15 to rotate relative to the housing 11 under external force, simultaneously driving the sheath 12, the first drive mechanism 131, and the second drive mechanism 132 to rotate coaxially relative to the housing 11. This eliminates the need to remove the handle from the support frame and then rotate the entire instrument by adjusting the rotating mechanism 15 during surgery for complex vascular tortuosity, especially in edge-to-edge repair of the mitral valve in the left atrium. This reduces surgical time and the probability of patient complications. Furthermore, because the sheath 12 rotates simultaneously and coaxially with the first drive mechanism 131 and the second drive mechanism 132, it avoids the kinking or jamming of the traction wire 14 caused by asynchronous rotation of the sheath 12 with the first drive mechanism 131 and / or the second drive mechanism 132 when rotation is required.

[0064] See Figure 2 and Figure 8 As shown, in one embodiment of the rotating mechanism 15, the rotating mechanism 15 includes a rotating component 151, a fixed frame 152, an inner sheath reinforcing tube 153, and two inner sheath guide rods 154. The inner sheath reinforcing tube 153 is disposed between the two inner sheath guide rods 154. The inner sheath reinforcing tube 153 and the inner sheath guide rods 154 are placed inside the housing 11. The sheath tube 12 passes through the inner sheath reinforcing tube 153 and is fixedly connected to the inner sheath reinforcing tube 153. Both the inner sheath reinforcing tube 153 and the inner sheath guide rods 154 are connected to the rotating component 151, and the inner sheath reinforcing tube 153 passes through the first drive mechanism 131 and is connected to the second drive mechanism 132. The inner sheath guide rod 154 passes through the first drive mechanism 131 and the fixed frame 152. The second drive mechanism 132 is mounted on the fixed frame 152. The rotating member 151 rotates relative to the shell 11 under the action of external force. At the same time, it drives the sheath tube 12 to rotate coaxially relative to the shell 11 through the inner sheath reinforcing tube 153 as the rotation axis, and drives the first drive mechanism 131 and the second drive mechanism 132 to rotate coaxially relative to the shell 11 through the inner sheath guide rod 154.

[0065] Specifically, the sheath tube 12 and the inner sheath reinforcing tube 153 can be fixed with medical adhesive.

[0066] Specifically, the rotating component 151 and the inner sheath reinforcing tube 153 can be connected by a snap-fit ​​method, and the rotating component 151 and the inner sheath guide rod 154 can be connected by a snap-fit ​​method.

[0067] Optionally, the rotating component 151 can be a knob or a rotating ring, and the embodiments of the present invention are not specifically limited thereto. Optionally, the rotating component 151 can be located at the proximal end of the housing 11, or at the distal end of the housing 11, or it can be located inside the housing 11 and exposed outside the housing 11, that is, located between the first driving mechanism 131 and the second driving mechanism 132, as long as the rotating component 151 is rotated, the sheath 12, the first driving mechanism 131 and the second driving mechanism 132 remain coaxially rotating, and the embodiments of the present invention are not specifically limited thereto.

[0068] The adjustable bending sheath 10 provided by this invention has a sheath 12 fixedly connected to an inner sheath reinforcing tube 153. An inner sheath guide rod 154 passes through a first drive mechanism 131. Both the inner sheath reinforcing tube 153 and the inner sheath guide rod 154 are connected to a rotating component 151. When the rotating component 151 is rotated, the inner sheath reinforcing tube 153 rotates relative to the housing 11 about its own central axis, causing the sheath 12 to rotate. Simultaneously, the two inner sheath guide rods 154 rotate relative to the housing 11 about the inner sheath reinforcing tube 153 as a rotation axis, causing the first drive mechanism 131 to rotate relative to the housing 11 about the inner sheath reinforcing tube 153 as a rotation axis. Since the second drive mechanism 132 is mounted on a fixed frame 152, the inner sheath... The guide rod 154 passes through the fixing frame 152. At this time, the inner sheath guide rod 154 drives the fixing frame 152 to rotate relative to the housing 11 with the inner sheath reinforcing tube 153 as the rotation axis. This, in turn, drives the second drive mechanism 132 to rotate relative to the housing 11 with the inner sheath reinforcing tube 153 as the rotation axis. In this way, when the rotating part 151 rotates relative to the housing 11 under the action of external force, the sheath tube 12, the first drive mechanism 131 and the second drive mechanism 132 rotate relative to the housing 11 simultaneously and coaxially. This can avoid the kinking or jamming of the traction wire 14 when the sheath tube 12 needs to rotate but the sheath tube 12 and the first drive mechanism 131 or / and the second drive mechanism 132 rotate asynchronously.

[0069] Further, as one embodiment, a first damping member 1511 is sleeved on the rotating member 151, and the first damping member 1511 abuts against the housing 11. As another embodiment, the first damping member 1511 is fixed on the housing 11, and the first damping member 1511 abuts against the rotating member 151. The first damping member 1511 can be silicone or rubber. When adjusting the sheath 12, the larger the bending angle, the greater the straightening force, and the greater the required operating force. Due to the linkage between the drive mechanism 13 and the rotating mechanism 15, when the straightening force is large enough, it can easily cause the rotating member 151 to rotate, thus causing the rotating member 151 to rotate during bending. Therefore, by setting the first damping member 1511, the present invention can prevent the rotating member 151 from rotating during bending, thereby affecting the surgeon's operation.

[0070] Specifically, the first damping member 1511 includes a damping ring 15111 and a damping block 15112. The rotating member 151 has an annular groove 1512. The damping ring 15111 is fitted onto the annular groove 1512. The rotating member 151 passes through the damping block 15112. The damping ring 15111 abuts against the damping block 15112. The damping block 15112 remains stationary with the housing 11.

[0071] Continue reading Figure 2 , Figure 5 and Figure 6 As shown, in one embodiment of the first driving mechanism 131, the first driving mechanism 131 includes a first active member 1311 and a first slider 1312 linked with the first active member 1311. The first slider 1312 is connected to the proximal end of the first traction wire 141 and is sleeved on the inner sheath reinforcing tube 153. Under the action of external force, the first active member 1311 moves relative to the shell 11 and drives the first slider 1312 to move on the inner sheath reinforcing tube 153, so that the first slider 1312 pulls and releases the first traction wire 141, thereby changing the bending state of the sheath tube 12.

[0072] Specifically, the first slider 1312 is sleeved on the two inner sheath guide rods 154. Under the action of external force, the rotating member 151 rotates relative to the shell 11 and simultaneously drives the sheath tube 12 to rotate coaxially relative to the shell 11 through the inner sheath reinforcing tube 153, and drives the first slider 1312 and the first active member 1311 to rotate coaxially relative to the shell 11 through the inner sheath guide rods 154. By sleeved on the two inner sheath guide rods 154, the first slider 1312 can rotate coaxially with the rotating member 151 when the rotating member 151 rotates, thereby driving the first active member 1311 to rotate together, avoiding the axial displacement of the first slider 1312 and the first active member 1311 when the sheath tube 12 is rotated, which would cause the sheath tube 12 to automatically bend.

[0073] In one specific embodiment, the outer surface of the first slider 1312 is threaded, and the first driving member 1311 is a sleeve with a threaded inner surface. The first slider 1312 is placed inside the sleeve and threadedly connected to it. When the sleeve rotates, the first slider 1312 moves along the axial direction of the sleeve. By placing the first slider 1312 inside the sleeve and threadedly connected to it, the internal space utilization of the housing 11 can be improved without affecting the unidirectional bending of the sheath 12. The first slider 1312 is threadedly connected to the sleeve and can achieve self-locking, meaning the first driving mechanism 131 has a self-locking capability, preventing the sheath 12 from automatically straightening and achieving the effect of stopping immediately upon release. Furthermore, no additional locking structure is required, reducing the cumbersome operation of secondary locking, improving surgical efficiency, and also reducing the risk of complications.

[0074] Furthermore, to facilitate the unidirectional bending of the adjustable bending sheath 10, a first driving ring 1313 can be fitted onto the outer periphery of the first driving member 1311. This first driving ring 1313 is at least partially exposed outside the housing 11 and rotates synchronously with the sleeve. Specifically, as one embodiment, a limiting protrusion (not shown) can be provided on the outer periphery of the sleeve, and a limiting groove (not shown) is formed on the inner periphery of the first driving ring 1313 corresponding to the position of the limiting protrusion. When the first driving ring 1313 is fitted onto the outer periphery of the first driving member 1311, the limiting protrusion is engaged in the limiting groove. As another embodiment, the limiting protrusion can be provided on the inner periphery of the first driving ring 1313, and the limiting groove can be formed on the outer periphery of the sleeve, as long as the limiting protrusion is engaged in the limiting groove when the first driving ring 1313 is fitted onto the outer periphery of the first driving member 1311.

[0075] See Figure 2 , Figure 9 and Figure 10 As shown, in one embodiment of the second drive mechanism 132, the second drive mechanism 132 includes a second driving member 1321 and two second sliders 1322 that are driven by the second driving member 1321. The proximal ends of the second traction wire 142 and the third traction wire 143 are respectively connected to the two second sliders 1322. Under the action of external force, the second driving member 1321 moves relative to the housing 11 and drives the two second sliders 1322 to move in opposite directions, so that when one second slider 1322 pulls the traction wire connected to it, the other second slider 1322 releases the traction wire connected to it simultaneously, thereby changing the bending state of the sheath tube 12 in a radial plane.

[0076] In one specific embodiment, the second driving mechanism 132 further includes two screws 1323 corresponding to the two second sliders 1322. The two second sliders 1322 are respectively sleeved on the two screws 1323, and the second sliders 1322 are threadedly connected to the screws 1323. The second driving member 1321 is drivenly connected to the two second sliders 1322 through the two screws 1323. The two screws 1323 are respectively located on opposite sides of the second driving member 1321 and are driven by the second driving member 1321 through gears. When the second driving member 1321 rotates, the two screws 1323... The rotation directions are the same, but the thread directions on the two screws 1323 are opposite. The second sliders 1322, sleeved on the screws 1323, move along the axial direction of the corresponding screws 1323. The two second sliders 1322 move in opposite directions. That is, when the second driving member 1321 moves relative to the housing 11 under the action of external force and drives the two screws 1323 to rotate, the two second sliders 1322 move in opposite directions. This allows one second slider 1322 to pull the traction wire connected to it, while the other second slider 1322 simultaneously releases the traction wire connected to it. Through the transmission method of the second driving member 1321, the two screws 1323, and the two second sliders 1322, the entire structure of the second drive mechanism 132 is more stable, and the force transmission is more balanced. This also improves the synchronicity of the second traction wire 142 and the third traction wire 143 during pulling and releasing. Meanwhile, compared with the existing rotary structure driving mechanism for pulling and releasing the traction wire, the second driving mechanism 132 also has a larger stroke, which allows for a wider range of choices for the bending angle of the sheath tube 12.

[0077] Specifically, two screws 1323 are mounted on the fixed frame 152, and two inner sheath guide rods 154 are connected to the fixed frame 152 corresponding to the two screws 1323. Two second sliders 1322 are respectively sleeved on the two inner sheath guide rods 154 to restrict the second sliders 1322 from circumferentially deflecting on the corresponding screws 1323. This serves two purposes: firstly, it limits the second sliders 1322, ensuring that the second sliders 1322 only move axially on the corresponding screws 1323, thereby avoiding phenomena such as kinking and jamming of the traction wire and inaccurate bending of the sheath tube 12; secondly, it allows the sheath tube 12, the second active member 1321, the two screws 1323, and the corresponding second sliders 1322 to rotate coaxially relative to the housing 11 when the rotating member 151 rotates relative to the housing 11 under the action of external force.

[0078] Specifically, the second slider 1322 is threadedly connected to the screw 1323 and can achieve self-locking. This allows the second drive mechanism 132 to have self-locking capability during bidirectional bending of the adjustable sheath 10, preventing the sheath 12 from automatically straightening and achieving the effect of stopping as soon as the handle is released. Furthermore, no additional locking structure is required, reducing the cumbersome operation of secondary locking, improving surgical efficiency, and also reducing the risk of complications.

[0079] Furthermore, to facilitate the bidirectional bending of the adjustable bending sheath 10, a second driving ring 1324 can be fitted onto the outer periphery of the second driving member 1321. This second driving ring 1324 is at least partially exposed outside the housing 11 and rotates synchronously with the second driving member 1321. Specifically, as one embodiment, a limiting protrusion (not shown) can be provided on the outer periphery of the second driving member 1321, and a limiting groove (not shown) is formed on the inner periphery of the second driving ring 1324 corresponding to the position of the limiting protrusion. When the second driving ring 1324 is fitted onto the outer periphery of the second driving member 1321, the limiting protrusion is engaged in the limiting groove. As another embodiment, the limiting protrusion can be provided on the inner periphery of the second driving ring 1324, and the limiting groove can be formed on the outer periphery of the sleeve, as long as the limiting protrusion is engaged in the limiting groove when the second driving ring 1324 is fitted onto the outer periphery of the second driving member 1321.

[0080] Furthermore, the inner sheath reinforcing tube 153 passes through the second driving member 1321 along its axial direction. A second damping member 1531 is sleeved on the inner sheath reinforcing tube 153, and the second damping member 1531 abuts against the second driving member 1321. The second damping member 1531 can be made of silicone or rubber. By providing the second damping member 1531, it is possible to ensure that the second driving member 1321 transmits power to the two screws 1323 during bidirectional bending, and also to keep the second driving member 1321 stationary with the inner sheath reinforcing tube 153 when not bending, thus further enhancing the self-locking capability of the second drive mechanism 132. Furthermore, when rotating component 151, it drives the two screws 1323 and the two second sliders 1322 to rotate coaxially through the inner sheath guide rod 154 and the fixing frame 152. Then, through the cooperation of the two screws 1323 and the second active component 1321, it drives the second active component 1321 to rotate synchronously. The presence of the second damping component 1531 allows the rotating component 151 to drive the sheath tube 12 to rotate through the inner sheath reinforcing tube 153, and also to drive the second active component 1321 to rotate synchronously through the inner sheath reinforcing tube 153. This improves the overall synchronicity when rotating the sheath tube 12, making the operation of rotating the sheath tube 12 more labor-saving.

[0081] See Figures 9-11 As shown, the housing 11 further includes a viewing window 111 corresponding to the positions of the two second sliders 1322. The presence of the viewing window 111 allows the surgeon to perform initial calibration before the operation, ensuring that the two second sliders 1322 are initially aligned in a centered state. This makes the bidirectional bending of the sheath 12 during the operation more precise. Simultaneously, since there is a delay in the straightening process of the sheath 12, the viewing window 111 allows for accurate observation of whether the sheath 12 has returned to its correct position, reducing surgical errors.

[0082] Continue reading Figure 6 , Figure 10 and Figure 11 As shown, specifically, the first drive ring 1313 is close to the far end of the housing 11, and the second drive ring 1324 is close to the near end of the housing 11. The near ends of the first traction wire 141, the second traction wire 142, and the third traction wire 143 are all located between the far end of the first drive ring 1313 and the near end of the second drive ring 1324. The second drive mechanism 132 controls bidirectional bending and has a more complex structure, while the first drive mechanism 131 controls unidirectional bending and has a simpler structure. This design allows the adjustable bending sheath 10 to be more compact internally, improving the space utilization of the adjustable bending sheath 10 and bringing the center of gravity of the adjustable bending sheath 10 closer to the center position. When the adjustable bending sheath 10 is fixed to the bracket, it avoids imbalance at both ends of the adjustable bending sheath 10.

[0083] See Figure 2 and Figure 12 As shown, further, a limiting groove 1532 is formed on the outer periphery of the inner sheath reinforcing tube 153, and a limiting plate 112 is provided on the housing 11 at the position corresponding to the limiting groove 1532. The limiting plate 112 cooperates with the limiting groove 1532 to axially limit the inner sheath reinforcing tube 153. Of course, the limiting groove 1532 can be formed on the inner wall of the housing 11, and the limiting plate 112 can be provided on the outer periphery of the inner sheath reinforcing tube 153. The embodiments of the present invention do not make specific limitations, as long as the cooperation between the limiting plate 112 and the limiting groove 1532 can axially limit the inner sheath reinforcing tube 153. When adjusting the sheath tube 12, the larger the bending angle, the greater the straightening force. The sheath tube 12 exerts a pulling force on the inner sheath reinforcing tube 153, which penetrates the interior of the adjustable sheath tube 10. When the sheath tube 12 pulls on the inner sheath reinforcing tube 153, it can easily change the assembly gap of the components of the adjustable sheath tube 10. If the gap is too large, it can easily lead to misfitting between the components, thus affecting the use of the adjustable sheath tube 10. If the gap is too small, it can easily increase the friction between the components, making the operation of the adjustable sheath tube 10 more laborious. This invention uses the limiting plate 112 and the limiting groove 1532 to axially limit the inner sheath reinforcing tube 153, so that the pulling force of the inner sheath reinforcing tube 153 from the sheath tube 12 is concentrated here, thereby keeping the assembly gap of the components of the adjustable sheath tube 10 unchanged.

[0084] In summary, the adjustable bending sheath 10 provided by this invention has an independent first driving mechanism 131 and a second driving mechanism 132, ensuring that unidirectional and bidirectional bending of the adjustable bending sheath 10 do not interfere with each other. During unidirectional bending, the operator rotates the first driving ring 1313 in one direction, causing the first active member 1311 to rotate, which in turn causes the first slider 1312 to move on the inner sheath reinforcing tube 153. This allows the first slider 1312 to pull the first traction wire 141, thereby bending the sheath 12. When it is necessary to straighten the sheath 12, the operator rotates the first driving ring 1313 in the opposite direction, causing the first active member 1311 to rotate in the opposite direction. This causes the first slider 1312 to move in the opposite direction on the inner sheath reinforcing tube 153, releasing the first traction wire 141 and straightening the sheath 12. During bidirectional bending, the operator rotates the second drive ring 1324 in one direction to drive the second active member 1321 to rotate, which in turn drives the two screws 1323 to rotate. The second sliders 1322 sleeved on the screws 1323 move in opposite directions along the axial direction of the corresponding screws 1323, so that when one second slider 1322 pulls the traction wire connected to it, the other second slider 1322 simultaneously releases the traction wire connected to it, thereby causing the sheath tube 12 to bend toward the side where the traction wire is pulled. When it is necessary to straighten the sheath tube 12, the operator rotates the second drive ring 1324 in the opposite direction to drive the second active member 1321 to rotate in the opposite direction, the two screws 1323 rotate, and the movement direction of the two second sliders 1322 is opposite to the original direction, thereby causing the traction wire that was originally pulled to be released, and the traction wire that was originally released to be pulled, thereby causing the sheath tube 12 to straighten toward the side where the traction wire was pulled. When cross-plane bending is required, the bending can be performed first by selecting a suitable angle on one plane using either the first drive mechanism 131 or the second drive mechanism 132, and then by using the other drive mechanism. Alternatively, the bending can be performed simultaneously using both drive mechanisms 131 and 132, allowing the bending direction to be not limited to a single plane. This makes it suitable for more complex surgeries and meets the surgical needs of doctors and patients for complex internal cardiac structures. Furthermore, the inclusion of the first damping element 1511 prevents the sheath 12 from rotating automatically during bending, thus avoiding interference with the surgeon's operation.

[0085] When the sheath 12 needs to be rotated, the operator rotates the rotating component 151, causing the inner sheath reinforcing tube 153 and the inner sheath guide rod 154 to rotate. The inner sheath guide rod 154 drives the first slider 1312 to rotate, which in turn drives the first active component 1311 to rotate. The inner sheath guide rod 154 also drives the second slider 1322 and the screw 1323 to rotate, which in turn drives the second active component 1321 to rotate. Simultaneously, the inner sheath reinforcing tube 153 drives the sheath 12 to rotate, and the second damping component 1531, in conjunction with the second active component 1321, drives the second active component 1321 to rotate. This improves the overall synchronization of rotating the sheath 12, making the operation more effortless. Furthermore, the rotation and bending of the sheath 12 are independent of each other; that is, the rotation and bending of the sheath 12 are not on the same working interface. Whether bending is performed after rotation or rotation is performed after bending, the original operating interface of the adjustable sheath 10 remains unchanged, thus avoiding surgical risks due to changes in the operating interface that could lead to errors by the surgeon.

[0086] Example 2

[0087] See Figure 13 and Figure 14 As shown, the similarities and differences between Embodiment 2 and Embodiment 1 will not be repeated here. The main difference is that, in the adjustable curved sheath 10 of Embodiment 2, as an alternative embodiment to the second drive mechanism 132, the second drive mechanism 132 can also be configured to directly drive the second driving member 1321 and the second slider 1322. Specifically, in this embodiment, the second drive mechanism 132 does not include the screw 1323. The two second sliders 1322 are respectively sleeved on the two inner sheath guide rods 154. The second sliders 1322 and the second driving member 1321 are threadedly driven, and the thread directions of the two second sliders 1322 are opposite. The inner sheath guide rod 154 can be a non-circular guide rail to prevent the second slider 1322 from circumferentially deflecting on the inner sheath guide rod 154. When the second active member 1321 rotates, the second slider 1322 moves along the axial direction of the corresponding inner sheath guide rod 154. The two second sliders 1322 move in opposite directions. That is, the second active member 1321 moves relative to the shell 11 under the action of external force and drives the two second sliders 1322 to move in opposite directions, so that when one second slider 1322 pulls the traction wire connected to it, the other second slider 1322 releases the traction wire connected to it simultaneously.

[0088] Example 3

[0089] See Figure 15As shown, the similarities or similarities between Embodiment 3 and Embodiment 1 will not be repeated here. The main difference between the two is that Embodiment 3 has a drive mechanism 13 and a traction wire 14. The proximal end of the traction wire 14 is connected to the drive mechanism 13, and the distal end is connected to the distal end of the sheath 12. The drive mechanism 13 can move relative to the housing 11 and pull and release the traction wire 14 to change the bending state of the sheath 12.

[0090] The sheath 12 of this invention can achieve unidirectional bending, reducing the frequency of catheter adjustments and replacements required by clinical operators, thus making the surgery easier to perform and reducing the risk of complications.

[0091] Example 4

[0092] See Figure 16 As shown, the similarities and differences between Embodiment 4 and Embodiment 1 will not be repeated here. The main difference is that Embodiment 4 has one drive mechanism 13 and two traction wires 14. The proximal ends of both traction wires 14 are connected to the drive mechanism 13, and the distal ends are connected to the distal end of the sheath 12. The drive mechanism 13 can move relative to the housing 11 and pull and release the two traction wires 14 to change the bending state of the sheath 12. Specifically, the distal ends of the two traction wires 14 are connected to the same radial plane at the distal end of the sheath 12 and are symmetrically arranged.

[0093] The sheath 12 of this invention can be bent in two opposite directions, thereby fully meeting the needs of interventional treatment for complex lesions such as tortuous blood vessels and variable vascular opening positions. This greatly reduces the frequency of catheter adjustments and replacements required by clinical operators, making the surgery easier to perform and reducing the risk of complications.

[0094] Example 5

[0095] See Figure 17 As shown, the similarities or similarities between Embodiment 5 and Embodiment 1 will not be repeated here. The main difference between the two is that there are two drive mechanisms 13 and two traction wires 14 in Embodiment 5. The traction wires 14 are connected to the drive mechanisms 13 in a one-to-one correspondence. Both drive mechanisms 13 can move relative to the housing 11 and pull and release the traction wires 14 connected to them respectively to change the bending state of the sheath 12.

[0096] Specifically, the proximal end of one traction wire 14 is connected to a drive mechanism 13, and the distal end is connected to the distal end of the sheath 12. The proximal end of another traction wire 14 is connected to another drive mechanism 13, and the distal end is connected to the distal end of the sheath 12. The two traction wires 14 are connected to the sheath 12 at different positions. Preferably, the distal ends of the two traction wires 14 are connected to different positions within the same radial plane at the distal end of the sheath 12.

[0097] The sheath 12 of this invention can be bent in two different directions, and the two bending processes are independently controlled and do not affect each other. This fully meets the needs of interventional treatment for complex lesions such as tortuous blood vessels and variable vascular opening positions, greatly reducing the frequency of catheter adjustments and replacements required by clinical operators, making the surgery easier to perform and reducing the risk of complications.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An adjustable bending sheath, characterized in that: The device includes a sheath, a housing located at the proximal end of the sheath, a first drive mechanism and a second drive mechanism located within the housing, and a first traction wire, a second traction wire, and a third traction wire. The proximal end of the first traction wire is connected to the first drive mechanism, and the proximal ends of the second and third traction wires are both connected to the second drive mechanism. The distal ends of the first, second, and third traction wires are all connected to the distal end of the sheath. The first drive mechanism and the second drive mechanism are respectively used to pull and release the traction wires connected to them to change the bending state of the sheath. The adjustable bending sheath also includes a rotating mechanism connected to the sheath, the first driving mechanism and the second driving mechanism. At least a portion of the rotating mechanism extends into the housing and the rotating mechanism is rotatable relative to the housing. The rotating mechanism extending into the housing can simultaneously drive the sheath, the first driving mechanism and the second driving mechanism to rotate coaxially relative to the housing.

2. The adjustable bending sheath according to claim 1, characterized in that: The shell is formed by joining an upper shell and a lower shell.

3. The adjustable bending sheath according to claim 1, characterized in that: The rotating mechanism includes a rotating component, a fixed frame, an inner sheath reinforcing tube, and two inner sheath guide rods. The sheath tube passes through the inner sheath reinforcing tube and is fixedly connected to the inner sheath reinforcing tube. Both the inner sheath reinforcing tube and the inner sheath guide rods are connected to the rotating component. The inner sheath reinforcing tube passes through the first driving mechanism and is connected to the second driving mechanism. The inner sheath guide rods pass through the first driving mechanism and the fixed frame. The second driving mechanism is located on the fixed frame. Under the action of external force, the rotating component drives the sheath tube to rotate coaxially with respect to the housing through the inner sheath reinforcing tube, and drives the first driving mechanism and the second driving mechanism to rotate coaxially with respect to the housing through the inner sheath guide rod.

4. The adjustable bending sheath according to claim 3, characterized in that: The first driving mechanism includes a first active member and a first slider that is linked to the first active member. The first slider is connected to the proximal end of the first traction wire and is sleeved on the inner sheath reinforcing tube. The first slider can move along the inner sheath reinforcing tube under the drive of the first active member, so that the first slider can pull and release the first traction wire.

5. The adjustable bending sheath according to claim 4, characterized in that: The first slider is sleeved on the two inner sheath guide rods. The rotating member rotates relative to the shell under the action of external force and drives the sheath tube to rotate coaxially through the inner sheath reinforcing tube, and drives the first slider and the first active member to rotate coaxially through the inner sheath guide rods.

6. The adjustable bending sheath according to claim 4, characterized in that: The first slider has a threaded outer surface, and the first driving member is a sleeve with a threaded inner surface. The first slider is placed inside the sleeve and threadedly connected to the sleeve. When the sleeve rotates, the first slider moves along the axial direction of the sleeve.

7. The adjustable bending sheath according to claim 3, characterized in that: The second drive mechanism includes a second driving member and two second sliders that are driven by the second driving member. The proximal ends of the second traction wire and the third traction wire are respectively connected to the two second sliders. The two second sliders move in opposite directions under the drive of the second driving member, so that when one second slider pulls the traction wire connected to it, the other second slider releases the traction wire connected to it simultaneously.

8. The adjustable bending sheath according to claim 7, characterized in that: The two second sliders are respectively sleeved on the two screws, and the second sliders are threadedly connected to the screws. The two screws pass through the fixed frame. The second driving member is driven by the two screws and the two second sliders. The two inner sheath guide rods are connected to the fixed frame corresponding to the two screws. The two second sliders are respectively sleeved on the two inner sheath guide rods to limit the second sliders from circumferential deflection on the corresponding screws. When the second active member moves relative to the housing under the action of external force and drives the two screws to rotate, the two second sliders move in opposite directions; the rotating member rotates relative to the housing under the action of external force and drives the sheath tube to rotate coaxially through the inner sheath reinforcing tube, and drives the fixed frame to rotate through the inner sheath guide rod, thereby driving the second active member, the two screws and the corresponding second slider to rotate coaxially.

9. The adjustable bending sheath according to claim 8, characterized in that: The second slider is threadedly connected to the screw and can achieve self-locking.

10. The adjustable bending sheath according to claim 1, characterized in that: The housing is provided with a viewing window.

11. The adjustable bending sheath according to claim 3, characterized in that: A first damping element is fixed on the housing, and the first damping element abuts against the rotating element to prevent the rotating element from rotating during bending.

12. The adjustable bending sheath according to claim 7, characterized in that: The inner sheath reinforcing tube passes through the second active member along the axial direction of the second active member, and a second damping member is sleeved on the inner sheath reinforcing tube, the second damping member abutting against the second active member.

13. The adjustable bending sheath according to claim 3, characterized in that: A limiting groove is provided on the outer periphery of the inner sheath reinforcing tube, and a limiting plate is provided on the shell corresponding to the position of the limiting groove. The limiting plate cooperates with the limiting groove to axially limit the inner sheath reinforcing tube.

14. The adjustable bending sheath according to claim 1, characterized in that: The first drive mechanism includes a first drive ring partially exposed above the housing, and the second drive mechanism includes a second drive ring partially exposed above the housing. The first drive ring is located near the distal end of the housing, and the second drive ring is located near the proximal end of the housing. The proximal ends of the first traction wire, the second traction wire, and the third traction wire are all located between the distal end of the first drive ring and the proximal end of the second drive ring.

15. The adjustable bending sheath according to claim 1, characterized in that: The distal ends of the first traction wire, the second traction wire, and the third traction wire are located at different positions on the same circumference of the same radial plane at the distal end of the sheath.

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