Bending-adjustable sheathing canal

Abstract

The bending-adjustable sheathing canal comprises a first sheathing canal section and a second sheathing canal section which are axially connected, an inner cavity of the first sheathing canal section is communicated with an inner cavity of the second sheathing canal section, the first sheathing canal section has first hardness, the second sheathing canal section has second hardness, the first hardness is larger than the second hardness, the first sheathing canal section is provided with a silk thread channel, and the silk thread channel is communicated with the first sheathing canal section. The bending control silk thread is movably arranged in the silk thread channel in a penetrating mode and connected with the second sheath tube section. The second sheathing canal section can be bent in a stress state, due to the fact that the hardness of the second sheathing canal section is low, enough bending degree can be formed in the bending process, the bending angle is larger, the bending diameter is smaller, the first sheathing canal section can form enough supporting force in the bending process of the second sheathing canal section, and the bending strength of the second sheathing canal section is improved. And stable bending control of the second sheathing canal section in a large bending angle state is ensured, so that the bending control capability of the bending-adjustable sheathing canal is improved based on mutual matching of different hardness of the first sheathing canal section and the second sheathing canal section.

Description

Technical Field

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

[0002] Adjustable bending sheaths play an important role in vascular and neurointerventional procedures. Operators can adjust the bending angle of the proximal end of the adjustable bending sheath to push the instrument to the target area with a tortuous angle, thereby reducing the probability of intraoperative operation errors and shortening the operation time.

[0003] While existing adjustable bending sheaths can achieve basic bending functions, they have certain shortcomings in terms of bending force and bending angle. For example, if the bending angle of an existing adjustable bending sheath is too large, and the supporting force of the adjustable bending sheath is insufficient during the insertion of the instrument, or if the instrument is too stiff, the bending angle of the adjustable bending sheath cannot be maintained in an ideal state, affecting the surgical outcome. Summary of the Invention

[0004] Therefore, it is necessary to provide an adjustable bending sheath to address the aforementioned technical problems.

[0005] This application provides an adjustable curved sheath, the adjustable curved sheath comprising:

[0006] A bend-controlled sheath, comprising an axially connected first sheath segment and a second sheath segment, wherein the inner cavities of the first sheath segment and the second sheath segment are connected, the first sheath segment has a first hardness, the second sheath segment has a second hardness, the first hardness is greater than the second hardness, and the first sheath segment has a filament channel.

[0007] A bending control wire is movably threaded through the wire channel and connected to the second sheath section.

[0008] In one embodiment, the maximum bendable angle at any location of the second sheath segment is greater than or equal to 150°; and / or,

[0009] The minimum bending diameter at any position of the second sheath segment is less than or equal to 30 mm;

[0010] And / or, the thread channel is opened along the axial direction of the first sheath segment, wherein the proximal channel opening of the thread channel is located at the proximal end of the first sheath segment, and the distal channel opening of the thread channel is located at the distal end of the first sheath segment.

[0011] And / or, the proximal end of the control wire is connected to the proximal end of the second sheath segment;

[0012] And / or, a developing element is provided at the proximal end of the second sheath segment, and the bending control wire is connected to the developing element.

[0013] In one embodiment, the bending control sheath includes a first inner tube, a first middle tube, and a first outer tube, wherein the first middle tube is sleeved outside the first inner tube, and the first outer tube is sleeved outside the first middle tube; the thread channel is formed in the first outer tube; and / or,

[0014] The material of the first sheath segment is at least one of polyether block polyamide, polypropylene, and polytetrafluoroethylene; and / or,

[0015] The material of the second sheath section is at least one of silicone rubber, polyurethane, and polyether block polyamide.

[0016] In one embodiment, the thread channel is formed inside the wall of the first outer tube; or,

[0017] The inner wall of the first outer tube is provided with a first protrusion, and the wire channel is formed in the first protrusion; or,

[0018] The outer wall of the first outer tube is provided with a second protrusion, and the wire channel is formed in the second protrusion; or...

[0019] The first middle layer tube has a braided structure.

[0020] In one embodiment, the adjustable bending sheath includes:

[0021] A flexible sheath, the flexible sheath being movably inserted into the inner cavity of the bend-controlled sheath, the flexible sheath having a third hardness, the third hardness being less than at least one of the first hardness and the second hardness.

[0022] In one embodiment, the flexible sheath includes a second inner tube, a second middle tube, and a second outer tube, wherein the second middle tube is sleeved outside the second inner tube, and the second outer tube is sleeved outside the second middle tube; the material of the second outer tube is polyether block polyamide, the second middle tube has a braided structure, and the material of the second inner tube is polytetrafluoroethylene.

[0023] In one embodiment, the adjustable bending sheath includes:

[0024] A bending control device is provided, wherein at least one bending control device is configured to be disposed in the first sheath section of the bending control sheath, the bending control device is connected to the bending control wire, and is used to control the movement of the bending control wire within the wire channel. The movement of the bending control wire within the wire channel is used to control the bending of the second sheath section.

[0025] In one embodiment, the bending control device includes:

[0026] The device body is connected to the first sheath segment of the bending control sheath.

[0027] A control component is movably mounted on the device body and connected to the bending control wire, used to control the movement of the bending control wire within the wire channel.

[0028] In one embodiment, the control component includes:

[0029] A guiding element, wherein the guiding element is disposed on the device body;

[0030] A moving element, which is movably assembled on the guide element along the guide trajectory of the guide element, and the moving element is connected to the bending control wire;

[0031] A control element is connected to the motion element, and the control element is used to control the motion element to move along the guide trajectory of the guide element, thereby controlling the movement of the bending control wire within the wire channel.

[0032] In one embodiment, the guiding element has a guiding groove for forming the guiding trajectory;

[0033] The control element has an internal cavity that extends through both ends of it, and the internal cavity of the control element is used to communicate with the internal cavity of the bending control sheath. The control element has a drive groove on its outside, and the drive groove is in the form of a circumferentially spiral shape on the outer wall of the control element.

[0034] The motion element is movably assembled in the guide groove and the drive groove, and the control element controls the movement of the motion element in the guide groove through the drive groove.

[0035] In the aforementioned adjustable bending sheath, the second sheath segment with lower hardness serves as the proximal segment closer to the target object, while the first sheath segment with higher hardness serves as the distal segment farther from the target object. During the bending process of the adjustable bending sheath, the second sheath segment can bend under stress. Due to its lower hardness, the second sheath segment can achieve sufficient bending during the bending process, resulting in a larger bending angle and a smaller bending diameter. Meanwhile, the first sheath segment can provide sufficient support during the bending process of the second sheath segment, ensuring stable bending control of the second sheath segment at a larger bending angle. Thus, the bending control capability of the adjustable bending sheath is improved by the interaction of the different hardnesses of the first and second sheath segments. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the bending process of an adjustable bending sheath provided in one embodiment of this application.

[0037] Figure 2 This is a schematic diagram of the radial cross-section of a controllable bending sheath provided in one embodiment of this application.

[0038] Figure 3 A schematic diagram of the radial cross-section of a controllable bending sheath provided for another embodiment of this application.

[0039] Figure 4 This is a schematic diagram of the radial cross-section of a controllable bending sheath provided in another embodiment of this application.

[0040] Figure 5 This is a schematic diagram of the structure of a bending control device provided in one embodiment of this application.

[0041] Figure 6 For example Figure 5 The diagram shows the exploded structure of the bending control device.

[0042] Figure 7 This is an assembly diagram of two bending control devices provided in one embodiment of this application.

[0043] Figure 8 This is a schematic diagram of the bending state of an adjustable bending sheath provided in one embodiment of this application.

[0044] Figure 9 This is a partial structural diagram of a flexible sheath provided in one embodiment of this application.

[0045] Figure 10 For example Figure 9 The diagram shows a radial cross-section of the flexible sheath.

[0046] Figure 11 This is a schematic diagram of the structure of an expander provided in one embodiment of this application.

[0047] Figure 12 This is a schematic diagram of the conveying state of an expander provided in one embodiment of this application.

[0048] Figure 13 This is a schematic diagram illustrating the delivery state of a controlled-bend sheath to a target blood vessel, according to one embodiment of this application.

[0049] Figure 14 This is a schematic diagram of the bending control state of a bending control sheath provided in an embodiment of this application within a target blood vessel.

[0050] Figure 15 This is a schematic diagram illustrating the delivery state of a flexible sheath within a target blood vessel, according to one embodiment of this application.

[0051] Icon labels:

[0052] 10. Target blood vessel;

[0053] 100. Expander;

[0054] 1000, Bending control sheath; 2000, Bending control wire; 3000, Bending control device; 4000, Developing element; 5000, Fluid delivery pipe; 6000, Sealing element;

[0055] 1000a, Flexible sheath; 1000b, First sheath core tube; 1000c, Second sheath core tube; 1100, First sheath segment; 1200, Second sheath segment; 1300, Thread channel; 1310, Proximal channel opening; 1320, Distal channel opening;

[0056] 1110, First inner tube; 1120, First middle tube; 1130, First outer tube; 1131, First protrusion; 1132, Second protrusion;

[0057] 1000a1, Second inner layer tube; 1000a2, Second middle layer tube; 1000a3, Second outer layer tube;

[0058] 3100, Device body; 3200, Control component; 3210, Guide element; 3220, Motion element; 3230, Control element; 3211, Guide groove; 3231, Drive groove. Detailed Implementation

[0059] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] To more clearly describe the structure of the adjustable bending sheath described above, the term "distal" is defined herein as the end furthest from the surgical object during the surgical procedure, and "proximal" as the end closest to the surgical object during the surgical procedure. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0066] To address the issue of poor bending control in existing adjustable bending sheaths when bending 180 degrees, this application provides an adjustable bending sheath with strong bending capability. (See reference...) Figure 1 As shown, the adjustable bending sheath includes a bending control sheath 1000 and a bending control wire 2000. The bending control sheath 1000 includes a first sheath section 1100 and a second sheath section 1200 connected axially. The inner cavities of the first sheath section 1100 and the second sheath section 1200 are connected. The first sheath section 1100 and the second sheath section 1200 can be two integrally formed tubes, or the first sheath section 1100 and the second sheath section 1200 can be two separate tubes, which are then connected end to end to form a complete bending control sheath 1000.

[0067] However, regardless of the configuration of the first sheath segment 1100 and the second sheath segment 1200 of the bending control sheath 1000, the first sheath segment 1100 and the second sheath segment 1200 must maintain different hardnesses. For example, the first sheath segment 1100 has a first hardness, and the second sheath segment 1200 has a second hardness, with the first hardness being greater than the second hardness. In this case, the first sheath segment 1100 has a higher hardness, which can generate sufficient supporting force during the bending process of the bending control sheath 1000, while the second sheath segment 1200 has a lower hardness, which can generate sufficient bending degree during the bending process of the bending control sheath 1000.

[0068] Therefore, as Figure 1 As shown, the second sheath segment 1200, with lower hardness, serves as the proximal segment closer to the target object, while the first sheath segment 1100, with higher hardness, serves as the distal segment farther from the target object. During the bending process of the control sheath 1000, the second sheath segment 1200 can bend under stress. Due to the lower hardness of the second sheath segment 1200, it can form sufficient curvature during bending, resulting in a larger bending angle and a smaller bending diameter. Meanwhile, the first sheath segment 1100 can provide sufficient support during the bending process of the second sheath segment 1200, ensuring stable bending control of the second sheath segment 1200 at a larger bending angle. Thus, based on the interaction of the different hardnesses of the first sheath segment 1100 and the second sheath segment 1200, the bending control capability of the adjustable sheath is improved.

[0069] The second sheath segment 1200 can be bent under various stress conditions. For example, the first sheath segment 1100 has a wire channel 1300, and the bending control wire 2000 is movably inserted in the wire channel 1300 and connected to the second sheath segment 1200. When an operator applies a force to the bending control wire 2000 from the outside and controls the bending control wire 2000 to move within the wire channel 1300, the bending control wire 2000 can transfer the force to the second sheath segment 1200, completing the bending of the second sheath segment 1200 under stress. In addition, those skilled in the art can achieve the bending of the second sheath segment 1200 under stress through other suitable methods, which are not limited here.

[0070] The second sheath segment 1200, being less rigid and thus more flexible, can have a lower radius of curvature when bent. In one embodiment, the maximum bendable angle of the second sheath segment 1200 at any position can be limited to greater than or equal to 150°. For example, due to its lower rigidity, the second sheath segment 1200 can achieve bends greater than 150° under the control of the bending control wire 2000, even achieving a 180° turnaround bend. Furthermore, the minimum bending diameter of the second sheath segment 1200 at any position can be limited to less than or equal to 30mm. For example, when the second sheath segment 1200 completes a bend greater than 150°, the bending diameter at the bending position can be controlled within 30mm. This allows for turnaround bends of the second sheath segment 1200 within a confined space, improving the surgical outcome.

[0071] The first sheath segment 1100 and the second sheath segment 1200 can have different hardnesses based on design factors such as structure and materials. For example, the material of the first sheath segment 1100 can be at least one of polyether block polyamide, polypropylene, and polytetrafluoroethylene. Other biocompatible polymer materials are not limited to the first sheath segment 1100. Similarly, the material of the second sheath segment 1200 can be at least one of silicone rubber, polyurethane, and polyether block polyamide. Other biocompatible polymer materials are not limited to the second sheath segment 1200. Therefore, those skilled in the art can select suitable biocompatible polymer materials to manufacture the first sheath segment 1100 and the second sheath segment 1200 based on actual needs, cost, performance, and other factors, including but not limited to the biocompatible polymer materials listed above.

[0072] Continue reading Figures 2 to 4As shown, in one embodiment, the bend-controlled sheath 1000 includes a first inner layer tube 1110, a first middle layer tube 1120, and a first outer layer tube 1130. The first middle layer tube 1120 is sleeved outside the first inner layer tube 1110, and the first outer layer tube 1130 is sleeved outside the first middle layer tube 1120. A suture channel 1300 is formed in the first outer layer tube 1130. Since the outer surface of the bend-controlled sheath 1000 needs to be smooth to move smoothly in the target blood vessel 10, the first outer layer tube 1130 of the bend-controlled sheath 1000 can be configured as a tube with a smooth outer surface.

[0073] In the above structure, such as Figure 2 As shown, the wire channel 1300 can be formed inside the wall of the first outer tube 1130, or as... Figure 3 As shown, the inner wall of the first outer tube 1130 is provided with a first protrusion 1131, and the wire channel 1300 is opened in the first protrusion 1131, or as shown in the figure. Figure 4 As shown, the outer wall of the first outer tube 1130 is provided with a second protrusion 1132, and the wire channel 1300 is opened in the second protrusion 1132. The first protrusion 1131 and the second protrusion 1132 can be matched according to the axial length required for the wire channel 1300, and are not limited here.

[0074] The first middle layer tube 1120 can adopt a braided structure, such as a braided structure of metal material, which can improve hardness.

[0075] For settings related to the control wire 2000, please refer to [link / reference]. Figures 2 to 4 As shown, the thread channel 1300 can be opened along the axial direction of the first sheath segment 1100. The thread channel 1300 has a proximal channel opening 1310 and a distal channel opening 1320. The bending thread 2000 can enter the thread channel 1300 from the distal channel opening 1320 and then exit from the proximal channel opening 1310, connecting with the second sheath segment 1200. Therefore, both the proximal channel opening 1310 and the distal channel opening 1320 of the thread channel 1300 are located in the first sheath segment 1100. Specifically, the proximal channel opening 1310 of the thread channel 1300 can be located at the proximal end of the first sheath segment 1100, and the distal channel opening 1320 of the thread channel 1300 can be located at the distal end of the first sheath segment 1100.

[0076] In addition, the proximal channel opening 1310 and distal channel opening 1320 of the wire channel 1300 can also be set at other positions in the first sheath section 1100 as needed, occupying different axial lengths of the first sheath section 1100, which is not limited here. Furthermore, when the bending control wire 2000 is connected to the second sheath section 1200, the bending control wire 2000 can also be connected to a suitable position in the second sheath section 1200 as needed, for example, the proximal end of the bending control wire 2000 can be connected to the proximal end of the second sheath section 1200. When a developing element 4000 is provided at the proximal end of the second sheath section 1200, the bending control wire 2000 can be selectively connected to the developing element 4000.

[0077] Operators can implement tension control of the bending wire 2000 through various methods and control structures, for example, see [reference needed]. Figures 5 to 7 As shown, in one embodiment, the adjustable bending sheath includes a bending control device 3000, the number of which is configured to be at least one, and each bending control device 3000 can be used to control a bending control wire 2000, such as Figure 5 As described above, a bending control device 3000 is used to control a bending control wire 2000, such as... Figure 7 As shown, the two bending control devices 3000 can be used to control the two bending control wires 2000, thereby controlling the second sheath section 1200 of the bending control sheath 1000 to bend in different directions. When the number of bending control wires 2000 and bending control devices 3000 is two or more, the wire channel 1300 can also be matched with the number of bending control wires 2000 as needed. Those skilled in the art can set it according to actual needs, and no limitation is made here.

[0078] The bending control device 3000 can be set in the first sheath section 1100 of the bending control sheath 1000. The bending control device 3000 is connected to the bending control wire 2000 and is used to control the movement of the bending control wire 2000 in the wire channel 1300. The movement of the bending control wire 2000 in the wire channel 1300 is used to control the bending of the second sheath section 1200. The bending control device 3000 can be mechanically or electrically controlled. For example, in one embodiment, the bending control device 3000 includes a device body 3100 and a control component 3200. The device body 3100 is connected to the first sheath section 1100 of the bending control sheath 1000. The device body 3100 serves as an assembly base and can be configured as a seat, cylinder, shell, or other forms, allowing the control component 3200 to be movably assembled on the device body 3100. The control component 3200 serves as a control structure for the tension control wire and is connected to the bending control wire 2000 to control the movement of the bending control wire 2000 within the wire channel 1300.

[0079] See Figure 6As shown, in one embodiment, the control component 3200 may include a guide element 3210, a motion element 3220, and a control element 3230. The guide element 3210 is disposed in the device body 3100 and can guide the movement of the motion element 3220, allowing the motion element 3220 to be movably mounted on the guide element 3210 along its guide trajectory. This guide trajectory can be a straight line or a curved line, which is not limited here. The motion element 3220 is used to connect to the bending control wire 2000. After the control element 3230 is connected to the motion element 3220, the control element 3230 can be used to control the motion element 3220 to move along the guide trajectory of the guide element 3210. When the motion element 3220 moves along the guide trajectory, it can apply a force to the bending control wire 2000 based on its own movement, thereby controlling the movement of the bending control wire 2000 within the wire channel 1300.

[0080] In one embodiment, the guide element 3210 may have a guide groove 3211, which may be a straight groove or a curved groove, thereby forming the aforementioned guide trajectory. The control element 3230 has an internal cavity extending through both ends, and the internal cavity of the control element 3230 communicates with the internal cavity of the bending control sheath 1000. Figure 6 As shown, a drive groove 3231 is formed on the outside of the control element 3230, and the drive groove 3231 is in the form of a circumferentially surrounding thread on the outer wall of the control element 3230.

[0081] Therefore, the motion element 3220 is movably mounted in the guide groove 3211 and the drive groove 3231. The threaded drive groove 3231 defines the central axis, and the control element 3230 can rotate about the central axis. This causes the motion element 3220 to move along the threaded drive groove 3231 during the rotation of the control element 3230 about the central axis. As the motion element 3220 moves in the drive groove 3231, the drive groove 3231 applies a driving force to the motion element 3220, so that the motion element 3220 can move along the guide groove 3211 under the action of the driving force. This enables the control element 3230 to control the movement of the motion element 3220 in the guide groove 3211 through the drive groove 3231.

[0082] like Figure 8As shown, the operator can manually or electrically operate the control element 3230 to rotate on a fixed axis. The drive groove 3231 on the control element 3230 drives the motion element 3220 to move within the guide groove 3211. During this process, the rotation of the control element 3230 is converted into linear motion of the motion element 3220 within the guide groove 3211 based on the drive groove 3231. Furthermore, when the control element 3230 rotates, the actual moving distance of the motion element 3220 within the drive groove 3231 is long, but the axial moving distance is short. That is, the long-distance movement of the motion element 3220 is proportionally converted into its movement within the guide groove 3211. This enables precise control of the bending wire 2000, thereby precisely controlling the bending angle of the second sheath segment 1200 of the bending sheath 1000, ensuring the safety and precision of the surgery, reducing the probability of intraoperative errors, reducing the difficulty for the surgeon to select target vessels, and shortening the operation time.

[0083] like Figure 9 and Figure 10 As shown, in addition to the control sheath 1000, the adjustable bending sheath is also equipped with a flexible sheath 1000a that cooperates with the control sheath 1000. The combined use of the control sheath 1000 and the flexible sheath 1000a enables long-distance bending and turning functionality. The flexible sheath 1000a is movably inserted into the inner cavity of the control sheath 1000. The flexible sheath 1000a has a third hardness, which is less than at least one of the first hardness and the second hardness. For example, the third hardness of the flexible sheath 1000a needs to be at least less than the first hardness of the first sheath segment 1100, and the flexible sheath 1000a can even have a lower hardness, so that the third hardness of the flexible sheath 1000a can be less than the second hardness of the second sheath segment 1200.

[0084] Those skilled in the art can adjust the hardness relationship between the first hardness, the second hardness, and the third hardness, as well as the actual hardness values ​​of the first hardness, the second hardness, and the third hardness, according to actual needs, thereby ensuring that the adjustable bending sheath 1000 and the flexible sheath 1000a cooperate with each other to improve the bending control capability of the adjustable bending sheath, without any limitations.

[0085] In the combination of the adjustable bending sheath 1000 and the flexible sheath 1000a, the adjustable bending sheath 1000 has a strong bending control function, which can be used to improve the bending control force of the adjustable bending sheath. At the same time, when combined with the softer flexible sheath 1000a, the bending angle of the adjustable bending sheath 1000 can still be maintained at the ideal bending angle when the instrument passes through the bending area of ​​the adjustable bending sheath 1000.

[0086] In one embodiment, the flexible sheath 1000a includes a second inner layer tube 1000a1, a second middle layer tube 1000a2, and a second outer layer tube 1000a3. The second middle layer tube 1000a2 is sleeved outside the second inner layer tube 1000a1, and the second outer layer tube 1000a3 is sleeved outside the second middle layer tube 1000a2. The material of the second outer layer tube 1000a3 is polyether block polyamide, the second middle layer tube 1000a2 has a braided structure, and the material of the second inner layer tube 1000a1 is polytetrafluoroethylene. In addition, those skilled in the art can select different materials to manufacture the second inner layer tube 1000a1, the second middle layer tube 1000a2, and the second outer layer tube 1000a3 of the flexible sheath 1000a according to actual needs; no limitation is made here.

[0087] Continue reading Figure 1 As shown, in one embodiment, the bending control device 3000 may further include a fluid delivery pipe 5000, a sealing element 6000, and other auxiliary accessories. The inner cavity of the fluid delivery pipe 5000 communicates with the inner cavity of the bending control sheath 1000. The sealing element 6000 may be a sealing valve or the like, and is disposed within the inner cavity of the control element 3230. In addition, those skilled in the art can add other suitable auxiliary accessories according to actual needs, which are not limited here.

[0088] like Figure 11 The image shows the expander 100 used in conjunction with the aforementioned adjustable curved sheath, as shown. Figure 12 As shown, after the second sheath segment 1200 of the bending control sheath 1000 is bent and maintained in an ideal bending state, the bending angle of the second sheath segment 1200 can be locked. At this time, the adapted flexible sheath 1000a can be inserted from the distal end of the first sheath segment 1100 of the bending control sheath 1000 and introduced into the aforementioned expander 100 through the flexible sheath 1000a.

[0089] like Figures 13 to 15 As shown, in one embodiment of the adjustable bending sheath described above, the adjustable bending sheath can be guided by the first sheath core tube 1000b, as follows: Figure 13 The delivery configuration shown is introduced to the target vascular location. The second sheath segment 1200 of the bendable sheath 1000 can complete the process within the target vessel 10 as described above. Figure 14 The 180° bend shown causes the proximal end of the second sheath segment 1200 to bend towards the distal end, at which point it can be withdrawn. Figure 13 The first sheath core tube 1000b is shown in the figure. (See figure) Figure 15As shown, the flexible sheath 1000a can be introduced from the distal end of the first sheath segment 1100 of the bending control sheath 1000, and then transported proximally through the bending control area of ​​the bending control sheath 1000, i.e., the bending control area of ​​the second sheath segment 1200, until the flexible sheath 1000a extends from the proximal end of the bending control sheath 1000. The flexible sheath 1000a can move within the target vessel 10 under the guidance of the second sheath core tube 1000c inside it.

[0090] 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.

[0091] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An adjustable bending sheath, characterized in that, The adjustable bendable sheath includes: A bend-controlled sheath, comprising an axially connected first sheath segment and a second sheath segment, wherein the inner cavities of the first sheath segment and the second sheath segment are connected, the first sheath segment has a first hardness, the second sheath segment has a second hardness, the first hardness is greater than the second hardness, and the first sheath segment has a filament channel. A bending control wire is movably threaded through the wire channel and connected to the second sheath section.

2. The adjustable bending sheath according to claim 1, characterized in that, The maximum bendable angle at any position of the second sheath segment is greater than or equal to 150°; and / or, The minimum bending diameter at any position of the second sheath segment is less than or equal to 30 mm; And / or, the thread channel is opened along the axial direction of the first sheath segment, wherein the proximal channel opening of the thread channel is located at the proximal end of the first sheath segment, and the distal channel opening of the thread channel is located at the distal end of the first sheath segment. And / or, the proximal end of the control wire is connected to the proximal end of the second sheath segment; And / or, a developing element is provided at the proximal end of the second sheath segment, and the bending control wire is connected to the developing element.

3. The adjustable bending sheath according to claim 1, characterized in that, The controlled-bend sheath includes a first inner tube, a first middle tube, and a first outer tube. The first middle tube is sleeved outside the first inner tube, and the first outer tube is sleeved outside the first middle tube. The thread channel is formed in the first outer tube; and / or, The material of the first sheath segment is at least one of polyether block polyamide, polypropylene, and polytetrafluoroethylene; and / or, The material of the second sheath section is at least one of silicone rubber, polyurethane, and polyether block polyamide.

4. The adjustable bending sheath according to claim 3, characterized in that, The thread channel is located inside the wall of the first outer tube; or, The inner wall of the first outer tube is provided with a first protrusion, and the wire channel is formed in the first protrusion; or, The outer wall of the first outer tube is provided with a second protrusion, and the wire channel is formed in the second protrusion; or... The first middle layer tube has a braided structure.

5. The adjustable bending sheath according to claim 1, characterized in that, The adjustable bendable sheath includes: A flexible sheath, the flexible sheath being movably inserted into the inner cavity of the bend-controlled sheath, the flexible sheath having a third hardness, the third hardness being less than at least one of the first hardness and the second hardness.

6. The adjustable bending sheath according to claim 5, characterized in that, The flexible sheath includes a second inner tube, a second middle tube, and a second outer tube. The second middle tube is sleeved outside the second inner tube, and the second outer tube is sleeved outside the second middle tube. The material of the second outer tube is polyether block polyamide, the second middle tube has a braided structure, and the material of the second inner tube is polytetrafluoroethylene.

7. The adjustable bending sheath according to claim 1, characterized in that, The adjustable bendable sheath includes: A bending control device is provided, wherein at least one bending control device is configured to be disposed in the first sheath section of the bending control sheath, the bending control device is connected to the bending control wire, and is used to control the movement of the bending control wire within the wire channel. The movement of the bending control wire within the wire channel is used to control the bending of the second sheath section.

8. The adjustable bending sheath according to claim 7, characterized in that, The bending control device includes: The device body is connected to the first sheath segment of the bending control sheath. A control component is movably mounted on the device body and connected to the bending control wire, used to control the movement of the bending control wire within the wire channel.

9. The adjustable bending sheath according to claim 8, characterized in that, The control component includes: A guiding element, wherein the guiding element is disposed on the device body; A moving element, which is movably assembled on the guide element along the guide trajectory of the guide element, and the moving element is connected to the bending control wire; A control element is connected to the motion element, and the control element is used to control the motion element to move along the guide trajectory of the guide element, thereby controlling the movement of the bending control wire within the wire channel.

10. The adjustable bending sheath according to claim 9, characterized in that, The guiding element has a guiding groove, which is used to form the guiding trajectory; The control element has an internal cavity that extends through both ends of it, and the internal cavity of the control element is used to communicate with the internal cavity of the bending control sheath. The control element has a drive groove on its outside, and the drive groove is in the form of a circumferentially spiral shape on the outer wall of the control element. The motion element is movably assembled in the guide groove and the drive groove, and the control element controls the movement of the motion element in the guide groove through the drive groove.

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