Adjustable bend sheath and delivery system

Abstract

The application belongs to the technical field of medical devices, and particularly relates to an adjustable bending sheath and a delivery system with the same. The adjustable bending sheath comprises a tube body, a first traction member and a second traction member. The tube body is provided with a bending adjusting section. The bending adjusting section has a first side surface and a second side surface arranged oppositely in a bending state. The first side surface is arranged on the inner side of the bending direction of the bending adjusting section, and the second side surface is arranged on the outer side of the bending direction of the bending adjusting section. The distal end of the first traction member is connected with the distal end of the first side surface, and the proximal end of the first traction member is arranged outside the tube body. The distal end of the second traction member is connected with the proximal end of the second side surface, and the proximal end of the second traction member is arranged outside the tube body. According to the adjustable bending sheath and the delivery system, the part of the tube body on the proximal side of the bending adjusting section is in a straight line state, the bending angle of the bending adjusting section is accurate, and the blood vessel is not compressed or damaged due to the bending of the non-bending adjusting section.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an adjustable curved sheath and a delivery system having the adjustable curved sheath. Background Technology

[0002] Medical sheaths are widely used in minimally invasive interventional diagnostic and therapeutic surgeries to establish access, deliver or retrieve instruments, administer drugs, or drain bodily fluids. Compared to ordinary sheaths, adjustable sheaths have distally adjustable bends, enabling rapid and reliable access to the target lesion location, thereby reducing surgical time.

[0003] However, when adjusting the bendable sheath, a hunchback phenomenon occurs on the other side of the bend, meaning the non-bendable portion bends significantly, making the sheath appear non-straight. Furthermore, this hunchback phenomenon can lead to the following problems:

[0004] 1) During the operation, when the sheath is inserted into the blood vessel and bent, the sheath may become hunched over, which can compress the blood vessel and, in severe cases, cause damage to the blood vessel wall.

[0005] 2) Due to the overall hunchback bending of the sheath tube, the bending angle of the bending section is lost, and the bending angle does not reach the ideal state of the design. Summary of the Invention

[0006] The objective of this invention is to at least solve the problem of bending occurring in the non-bending section of the sheath during the bending process. This objective is achieved through the following means:

[0007] A first aspect of the present invention provides an adjustable bendable sheath, the adjustable bendable sheath comprising:

[0008] The pipe body is provided with a bending section. The bending section has a first side and a second side that are arranged opposite to each other in the bending state. The first side is located inside the bending direction of the bending section, and the second side is located outside the bending direction of the bending section.

[0009] The first traction member has its distal end connected to the distal end of the first side, and its proximal end extends to the outside of the tube body.

[0010] The second traction member has its distal end connected to the proximal end of the second side, and the proximal end of the second traction member extends to the outside of the tube body.

[0011] In addition, the adjustable bending sheath according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, the adjustable bending sheath further includes a driving device, wherein the proximal end of the first traction member and / or the proximal end of the second traction member is connected to the driving device, the driving device is rotatably sleeved on the outside of the tube body, and drives the first traction member and / or the second traction member to move along the axial direction of the tube body by rotating itself.

[0013] In some embodiments of the present invention, the driving device includes a main driving member and at least one transmission assembly. The main driving member is sleeved on the outside of the tube body in a manner that allows it to rotate about the axis of the tube body. The proximal end of the first traction member and / or the proximal end of the second traction member is connected to the at least one transmission assembly, and the at least one transmission assembly is drively connected to the main driving member.

[0014] In some embodiments of the present invention, the transmission assembly includes at least a gear, and the outer peripheral surface or distal end surface of the main drive member is provided with a rack distributed in a circumferential direction, and the gear meshes with the rack.

[0015] In some embodiments of the present invention, the transmission assembly further includes a traction wheel, which is connected to one end of the gear and rotates together with the gear. The first traction member and / or the second traction member are connected to the traction wheel and are wound around the outer circumferential surface of the traction wheel while the traction wheel is rotating.

[0016] In some embodiments of the present invention, an annular groove is provided on the outer peripheral surface of the traction wheel, and the first traction member and / or the second traction member can be wound around the annular groove.

[0017] In some embodiments of the present invention, the driving device includes a first transmission component and a second transmission component. The first transmission component is provided with a first gear and a first traction wheel connected to the first gear. The second transmission component is provided with a second gear and a second traction wheel connected to the second gear. A rack distributed along the circumferential direction is provided on the outer peripheral surface or distal end surface of the main driving member. The gear meshes with the rack. The first gear and the second gear mesh with the rack respectively. The proximal end of the first traction member is connected to the first traction wheel. The proximal end of the second traction member is connected to the second traction wheel. The diameter of the first traction wheel is larger than the diameter of the second traction wheel.

[0018] In some embodiments of the present invention, an annular groove is provided on the outer peripheral surface of the traction wheel, and the first traction member and / or the second traction member can be wound around the annular groove.

[0019] In some embodiments of the present invention, the adjustable bending sheath further includes a handle and a rotating member. The driving device and a portion of the tube body are disposed inside the handle. The rotating member includes a connected operating part and a transmission part. The transmission part is sleeved inside the handle in a manner that allows it to rotate around the axis of the tube body and is connected to the main driving member for driving the main driving member to rotate around the axis of the tube body. At least a portion of the operating part extends outside the handle.

[0020] In some embodiments of the present invention, the adjustable bending sheath further includes a first limiting member, which is used to connect the tube body and the handle and fix the relative position of the tube body and the handle in the circumferential direction of the tube body; and / or, the adjustable bending sheath further includes a second limiting member, which is fixedly disposed inside the handle and sleeved between the tube body and the main drive member. The outer circumferential surface of the second limiting member is provided with a first positioning block and a second positioning block. The first positioning block and the second positioning block are spaced apart in the axial direction of the second limiting member and are used to clamp the main drive member together.

[0021] In some embodiments of the present invention, the adjustable bending sheath further includes a driving device, the driving device including at least one driving member, the at least one driving member moving along the axial direction of the tube body, and the first traction member and / or the second traction member being connected to the at least one driving member.

[0022] In some embodiments of the present invention, the adjustable bending sheath further includes a rotating member, the rotating member including a connected operating part and a transmission part, wherein the transmission part includes a first transmission part and a second transmission part, the diameter of the first transmission part is larger than the diameter of the second transmission part, the proximal end of the first traction member is connected to the outer surface of the first transmission part, and the proximal end of the second traction member is connected to the outer surface of the second transmission part. When the operating part is rotated, the first traction member is wound around the outer surface of the first transmission part, and the second traction member is wound around the outer surface of the second transmission part.

[0023] In some embodiments of the present invention, the second transmission part is disposed within the first transmission part.

[0024] In some embodiments of the present invention, the outer surfaces of the first transmission part and the second transmission part are both provided with spiral grooves.

[0025] Another aspect of the present invention provides a conveying system having the adjustable bend sheath described in any of the preceding claims.

[0026] According to the aforementioned adjustable bending sheath and delivery system, the distal end of the first traction member is connected to the distal end of the first side, and the distal end of the second traction member is connected to the proximal end of the second side. When the tube body needs to be bent, the first and second traction members are pulled simultaneously towards the proximal end of the adjustable bending sheath. By pulling the first traction member towards the proximal end, the distal end of the bending section is subjected to a traction force towards the proximal end, thereby causing the bending section to bend and deform towards the first side. This also causes a portion of the tube body located on the proximal side of the bending section to tend to bend and deform towards the first side. Simultaneously, by pulling the second traction member towards the proximal end, a portion of the tube body on the proximal side of the bending section tends to bend and deform towards the second side, thus counteracting the tendency to bend and deform towards the first side. This prevents the portion of the tube body on the proximal side of the bending section from bending and deforming, i.e., prevents the non-bending section of the tube body from bending during the bending process. This ensures that the portion of the tube body on the proximal side of the bending section remains in a straight state, ensuring the accuracy of the bending angle of the bending section and reducing or avoiding compression or damage to blood vessels due to bending of the non-bending section. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0028] Figure 1 This is a schematic diagram of the adjustable bending sheath according to one embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the adjustable bendable sheath after removing part of the shell according to one embodiment of the present invention;

[0030] Figure 3 This is a schematic cross-sectional view of an adjustable bendable sheath according to an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the connection structure between the bending member and the traction member according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the first housing according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a driving device according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the drive device according to another embodiment of the present invention from another angle;

[0035] Figure 8 This is a schematic diagram of the main drive component according to an embodiment of the present invention;

[0036] Figure 9 This is a structural schematic diagram of the main drive component from another angle according to one embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the structure of the first gear according to an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the structure of the first traction wheel according to an embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the connection structure between the first traction wheel and the first traction member according to an embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the connection structure between the second traction wheel and the second traction member according to an embodiment of the present invention;

[0041] Figure 14 This is a schematic diagram of the structure of a rotating component according to an embodiment of the present invention;

[0042] Figure 15 This is a schematic diagram of the structure of the first limiting member according to an embodiment of the present invention;

[0043] Figure 16 This is a schematic diagram of the structure of the second limiting member according to an embodiment of the present invention;

[0044] Figure 17 This is a schematic diagram of the rotating component and the tube body according to one embodiment of the present invention;

[0045] Figure 18 for Figure 17 A diagram from another perspective;

[0046] Figure 19 for Figure 17 A schematic diagram from another perspective. Detailed Implementation

[0047] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0048] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0049] 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.

[0050] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0051] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0052] This invention proposes an adjustable bending sheath, which can effectively solve the problem of bending in the non-adjustable section of the sheath during the bending process.

[0053] Combination Figures 1 to 4 As shown, in one embodiment of the present invention, the adjustable bending sheath 1 of the present invention includes a tube body 20, a first traction member 41 and a second traction member 42. The tube body 20 is provided with an adjusting section 21 near its distal end. The adjusting section 21 has a first side surface 2111 and a second side surface 2112 arranged opposite to each other in the bending state. The first side surface 2111 is located inside the bending direction of the adjusting section 21, and the second side surface 2112 is located outside the bending direction of the adjusting section 21. The distal end of the first traction member 41 is connected to the distal end of the first side surface 2111, and the proximal end of the first traction member 41 extends to the outside of the tube body 20. The distal end of the second traction member 42 is connected to the proximal end of the second side surface 2112, and the proximal end of the second traction member 42 extends to the outside of the tube body 20. It should be noted that the proximal end of the first traction member 41 extending to the outside of the tube body 20 can be understood as the proximal end of the first traction member 41 extending from the proximal end of the tube body 20, or extending from the side wall of the tube body 20 near the proximal end.

[0054] According to the adjustable bending sheath 1, the distal end of the first traction member 41 is connected to the distal end of the first side surface 2111, and the distal end of the second traction member 42 is connected to the proximal end of the second side surface 2112. When it is necessary to bend the tube body 20, the first traction member 41 and the second traction member 42 are pulled simultaneously toward the proximal end of the adjustable bending sheath 1. By pulling the first traction member 41 toward the proximal end, the distal end of the bending section 21 is subjected to a traction force toward the proximal end, thereby causing the bending section 21 to bend and deform toward the first side surface 2111, and causing the portion of the tube body located on the proximal side of the bending section 21 to have a bending force toward the first side surface 2111. The tendency of the tube to bend and deform in the direction of bending is counteracted by pulling the second traction member 42 towards the proximal end, causing a portion of the tube body on the proximal side of the bending section 21 to bend and deform in the direction of the second side 2112. This counteracts the tendency of the tube body to bend and deform in the direction of the first side 2111, preventing the portion of the tube body on the proximal side of the bending section 21 from bending and deforming. In other words, it prevents the non-bending section 22 of the tube body 20 from bending during the bending process, thereby ensuring that the portion of the tube body on the proximal side of the bending section 21 is in a straight state, ensuring the accuracy of the bending angle of the bending section 21, and reducing or avoiding compression or damage to blood vessels due to bending of the non-bending section 22.

[0055] Specifically, in combination Figures 1 to 4As shown, in one embodiment of the present invention, the adjustable bending sheath 1 includes a handle 10, and the handle 10 contains a drive device 30 and a portion of the tube body 20. To facilitate assembly of components inside the handle 10, the handle 10 includes a detachably connected housing 11, a front end cap 12, and a rear end cap 13. The housing 11 includes a first housing 111 and a second housing 112 symmetrically arranged along its own axis, the first housing 111 and the second housing 112 forming a cavity structure for accommodating the drive device 30. For ease of description, in one embodiment of the present invention, only the first housing 111 is used as an example. Figure 3 and Figure 5 As shown, the outer peripheral surface of the distal end of the first housing 111 is provided with a first external thread 1111, and the outer peripheral surface of the distal end of the second housing 112 is provided with a second external thread. The first external thread 1111 and the second external thread together form a complete thread structure. The inner wall surface of the front cover 12 is provided with a complete internal thread structure, which can mate with the complete external thread, thereby realizing the threaded connection between the front cover 12 and the distal end of the housing 11, and fixing the distal ends of the first housing 111 and the distal ends of the second housing 112. The center of the front cover 12 is also provided with a through hole for leading out the tube 20, through which the distal end of the tube 20 can extend to the outside of the handle 10.

[0056] like Figure 3 As shown, in one embodiment of the present invention, the adjustable bending sheath 1 further includes a rotating member 50, and part of the structure of the rotating member 50 (such as...) Figure 14 The transmission part 52) ​​is located inside the housing 11 and is connected to the drive device 30 for transmission. Another part of the rotating part 50 (such as...) Figure 14 The operating part 51 is located outside the housing 11 for easy operation. The proximal ends of the first housing 111 and the second housing 112 are respectively inserted between the two parts of the rotating member 50, thereby fixing the relative positions of the proximal ends of the first housing 111 and the second housing 112 by the rotating member 50. At the same time, the rotating member 50 can rotate relative to the outer peripheral surface of the housing 11, thereby moving the drive device 30 and adjusting the bending state of the tube 20 by the first traction member 41 and the second traction member 42.

[0057] Combination Figure 3 and Figure 4As shown, in one embodiment of the present invention, the adjustable sheath 1 further includes an adjusting member 211, which is disposed within the adjusting section 21. The adjusting member 211 itself is prone to bending deformation in a direction perpendicular to its own axial direction. Specifically, an annular groove can be provided in the adjusting section 21, and the adjusting member 211 can be embedded in the annular groove. Under the traction of the first traction 41, the adjusting member 211 can bend to one side. The side of the adjusting member 211 facing the bend is defined as the inner side of the adjusting member 211, the inner side of the adjusting member 211 is defined as the first side 2111, the side of the adjusting member 211 away from the bend is defined as the outer side of the adjusting member 211, and the outer side of the adjusting member 211 is defined as the second side 2112. The distal end of the first traction member 41 is connected to the distal end of the first side 2111, the proximal end of the first traction member 41 is connected to the driving device 30, and at least a portion of the proximal and distal ends of the first traction member 41 are inserted into the tube wall of the tube body 20. The distal end of the second traction member 42 is connected to the proximal end of the second side surface 2112, and the proximal end of the second traction member 42 is connected to the driving device 30. At least a portion of the proximal and distal ends of the second traction member 42 are inserted into the pipe wall of the pipe body 20. It is understood that the portions of the first traction member 41 and the second traction member 42 inserted into the pipe wall of the pipe body 20 can be constrained by the pipe wall of the pipe body 20, thus limiting the axial or circumferential displacement of these portions. Specifically, the first traction member 41 is a bending wire, and the second traction member 42 is a traction wire.

[0058] Combination Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments of the present invention, the driving device 30 is rotatably sleeved on the outside of the tube body 20, and drives the first traction member 41 and the second traction member 42 to move along the axial direction of the tube body 20 by its own rotation.

[0059] Specifically, the driving device 30 includes a main driving member 31, a first transmission assembly 32, and a second transmission assembly 33. The main driving member 31 is sleeved on the outside of the tube body 20 in a manner that allows it to rotate around the axial direction of the tube body 20. The proximal end of the first traction member 41 is connected to the first transmission assembly 32, and the proximal end of the second traction member 42 is connected to the second transmission assembly 33. The first transmission assembly 32 and the second transmission assembly 33 are respectively connected to the main driving member 31, thereby driving the first traction member 41 and the second traction member 42 through the first transmission assembly 32 and the second transmission assembly 33, thereby adjusting the bending state of the tube body 20. The first transmission assembly 32 is located on the side closer to the first housing 111, and the second transmission assembly 32 is located on the side closer to the second housing 112.

[0060] Combination Figures 5 to 12As shown, in some embodiments of the present invention, the first transmission assembly 32 includes a first gear 321, a first traction wheel 322, and a first bearing 323. The main drive member 31 includes a first connecting portion 311 and a second connecting portion 312. The first connecting portion 311 is disposed at the distal end of the second connecting portion 312. A rack 3111 distributed in a circumferential direction is provided on the distal end face of the first connecting portion 311. The first gear 321 meshes with the rack 3111, thereby driving the first gear 321 to rotate by rotating the main drive member 31. In some embodiments of the present invention, a rack 3111 facing the distal or proximal end can also be provided on the outer peripheral surface of the main drive member 31 and mesh with the first gear 321. The first gear 321 has a first connecting shaft 3211 at its end facing the first housing 111, and a second connecting shaft 3212 at its end facing away from the first housing 111. The first connecting shaft 3211 is inserted into the inner hole of the first bearing 323. The inner wall of the first housing 111 has a first fixing hole 1112, and the first bearing 323 is installed in the first fixing hole 1112 to support the rotation of the first gear 321. The end face of the first traction wheel 322 facing the first gear 321 has a connecting hole 3221. The second connecting shaft 3212 is inserted into the connecting hole 3221 and fixed, so that the first gear 321 is connected to the first traction wheel 322 and drives the first traction wheel 322 to rotate together. In the state of rotation of the first traction wheel 322, the first traction member 41 is wound around the outer circumference of the first traction wheel 322. Furthermore, to prevent slippage between the second connecting shaft 3212 and the first traction wheel 322 in the connecting hole 3221 during rotation, and to avoid the first traction wheel 322 and the first gear 321 not rotating synchronously, a mounting protrusion 3213 is provided on the outer peripheral surface of the second connecting shaft 3212, and a mounting groove 3222 is provided on the inner wall surface of the connecting hole 3221. The mounting protrusion 3213 is inserted into the mounting groove 3222, thereby ensuring the synchronous rotation of the first traction wheel 322 and the first gear 321.

[0061] Furthermore, in some embodiments of the present invention, the first transmission assembly 32 further includes a first positioning pin 324. The end face of the first traction wheel 322 opposite to the first gear 321 is provided with an insertion hole (not shown in the figure), and the first positioning pin 324 is inserted into the insertion hole. The first positioning pin 324 and the first traction wheel 322 are respectively provided with through holes along the radial direction of the first traction wheel 322. The through hole of the first positioning pin 324 is located in the middle of the through hole of the first traction wheel 322 and the through hole of the first positioning pin 324 is interconnected with the through hole of the first traction wheel 322. The proximal end of the first traction member 41 passes through a part of the through hole of the first traction wheel 322, the through hole of the first positioning pin 324 and another part of the through hole of the first traction wheel 322 in sequence and is located on the outside of the first traction wheel 322. By rotating the first positioning pin 324, the through hole of the first positioning pin 324 and the through hole of the first traction wheel 322 are not on the same straight line. Part of the first traction member 41 is stuck between the first positioning pin 324 and the first traction wheel 322. Due to the friction, the first traction member 41 and the first traction wheel 322 can be fixedly connected. Furthermore, glue can be dripped between the first positioning pin 324 and the first traction wheel 322. In other embodiments, the traction component and the traction wheel can be simply connected by welding, gluing, or conventional methods such as mechanical structures.

[0062] Furthermore, in some embodiments of the present invention, an annular groove 3223 is provided on the outer peripheral surface of the first traction wheel 322, and the first traction member 41 can be wound around the annular groove 3223 during the rotation of the first traction wheel 322.

[0063] Combination Figures 5 to 13As shown, in some embodiments of the present invention, the second transmission assembly 33 includes a second gear 331, a second traction wheel 332, a second bearing 333, and a second positioning pin 334. The connection relationship between the second gear 331, the second traction wheel 332, the second bearing 333, and the second positioning pin 334 is consistent with the connection relationship between the first gear 321, the first traction wheel 322, the first bearing 323, and the first positioning pin 324, and will not be described again here. The inner wall of the second housing 112 is provided with a second fixing hole (not shown in the figure). The second bearing 333 is sleeved in the second fixing hole of the second housing 112, and the second gear 331 is meshed with the rack 3111 of the main drive member 31. The second traction wheel 332 is connected to the second traction member 42, thereby rotating the main drive member 31 to simultaneously pull the first traction member 41 and the second traction member 42, and adjusting the bending condition of the tube 20. In the initial state, that is, when the bending member 211 has not bent but is about to bend, both the first traction member 41 and the second traction member 42 are in a tensioned state. The first traction member 41 is only fixed to the first traction wheel 322 and is not wrapped around the outer circumferential surface of the first traction wheel 322. The second traction member 42 is only fixed to the second traction wheel 332 and is not wrapped around the outer circumferential surface of the second traction wheel 332.

[0064] Furthermore, combined Figure 6 and Figure 7 As shown, in some embodiments of the present invention, the diameter of the first traction wheel 322 is larger than the diameter of the second traction wheel 332. Since the first gear 321 and the second gear 331 are respectively meshed with the rack 3111 of the main drive member 31, the first gear 321 and the second gear 331 rotate at the same angle under the action of the main drive member 31. And since the diameter of the first traction wheel 322 is larger than the diameter of the second traction wheel 332, when the rotation angles of the second traction wheel 332 and the first traction wheel 322 are the same, the length of the first traction member 41 wrapped around the first traction wheel 322 is greater than the length of the second traction member 42 wrapped around the second traction wheel 332. This results in the displacement length of the distal end of the first traction member 41 being greater than the displacement length of the distal end of the second traction member 42. Consequently, the bending member 211 bends under the action of the first traction member 41, achieving the purpose of bending. Meanwhile, the non-bending section 22 resists bending under the action of the second traction member 42, thus keeping the non-bending section 22 in a straight state and preventing the adjustable bending sheath 1 from bowing during the bending process.

[0065] It should be noted that when the diameter of the first traction wheel 322 is the same as that of the second traction wheel 332, the axial displacement lengths of the first traction member 41 and the second traction member 42 are the same. In the non-bending section 22, the second traction member 42 can pull the tube body 20 into a reverse bending state, thus causing the tube body 20 to bend in an "S" shape. Furthermore, since the second traction member 42 is located in the non-bending section 22, the hardness of the non-bending section 22 is relatively high, which can easily cause the second traction member 42 to break.

[0066] Combination Figure 3 , Figure 5 , Figure 8 and Figure 9 As shown, in some embodiments of the present invention, a first annular portion 313 is further provided on the outer peripheral surface of the main drive member 31. The first annular portion 313 divides the main drive member 31 into a first connecting portion 311 and a second connecting portion 312 along the axial direction. A limiting protrusion 3131 is provided on the distal end face of the first annular portion 313, and a rib 1113 is provided on the inner wall surface of the first housing 111. The rib 1113 is connected to the outer wall of the first fixing hole 1112. During the rotation of the main drive member 31, the limiting protrusion 3131 can abut against the side of the rib 1113, that is, the maximum rotation range of the main drive member 31 is limited to the limiting protrusion 3131 rotating from one side of the rib 1113 to the other side of the rib 1113, thereby limiting the maximum rotation angle range of the main drive member 31 to less than 360°.

[0067] Combination Figure 3 and Figure 14 As shown, in some embodiments of the present invention, the rotating member 50 includes an operating part 51 and a transmission part 52 connected together. The transmission part 52 is sleeved inside the handle 10 in a manner that allows it to rotate around the axis of the tube body 20, and is connected to the main drive member 31 for driving the main drive member 31 to rotate around the axis of the tube body. At least a portion of the operating part 51 extends to the outside of the handle 10.

[0068] Specifically, the connection between the operating part 51 and the transmission part 52 is provided with a first gap and a second gap at the front and rear ends along the axial direction of the rotating member 50, respectively. The proximal end of the housing 11 is inserted into the first gap, and the distal end of the rear end cover 13 is inserted into the second gap. The rotating member 50 can rotate around the outer peripheral surface of the housing 11 and the outer peripheral surface of the rear end cover 13, thereby driving the main drive member 31 to rotate around the axis of the tube body 20 through the transmission part 52.

[0069] Combination Figure 3 , Figure 8 , Figure 9 and Figure 14As shown, the outer peripheral surface of the second connecting portion 312 of the main drive member 31 is provided with a plurality of connecting protrusions 3121. The plurality of connecting protrusions 3121 are spaced apart along the circumferential direction of the second connecting portion 312. The inner wall surface of the transmission part 52 is provided with a plurality of connecting grooves 521. By fitting the transmission part 52 onto the outside of the second connecting portion 312 and inserting the connecting protrusions 3121 into the connecting grooves 521, the main drive member 31 is driven to rotate by rotating the operating part 51, and the first traction member 41 and the second traction member 42 are pulled.

[0070] like Figure 3 As shown, in some embodiments of the present invention, the adjustable bending sheath 1 further includes a connector 60. One end of the connector 60 passes through the rear end cap 13 and is inserted into the interior of the handle 10. The proximal end of the tube body 20 is inserted into the inner hole of the connector 60, thereby fixing the relative position of the proximal end of the tube body 20 and the rear end cap 13 in the axial direction. The other end of the connector 60 is located outside the handle 10 for communication with other devices, such as feeding a guide wire into the tube body 20 inside the handle 10 through the connector 60.

[0071] Combination Figure 3 , Figure 5 and Figure 15 As shown, in some embodiments of the present invention, the adjustable bending sheath 1 further includes a first limiting member 70, which is used to connect the tube body 20 and the handle 10 and fix the relative position of the tube body 20 and the handle 10 in the circumferential direction of the tube body 20.

[0072] Specifically, the first limiting member 70 includes a main body 71 and a first insertion end 711 and a second insertion end 712 symmetrically arranged about the main body 71. The main body 71 has a through hole for the tube 20 to pass through. The inner wall of the first housing 111 has a first limiting groove 1114, and the inner wall of the second housing 112 has a second limiting groove opposite to the first limiting groove 1114. The first insertion end 711 is inserted into the first limiting groove 1114, and the second insertion end 712 is inserted into the second limiting groove, thereby effectively preventing the tube 20 from rotating in its circumferential direction.

[0073] Combination Figure 3 , Figure 6 and Figure 16 As shown, in some embodiments of the present invention, the adjustable bending sheath 1 further includes a second limiting member 80. The second limiting member 80 is fixedly disposed inside the handle 10 and sleeved between the tube body 20 and the main drive member 31. A first positioning block 811 and a second positioning block 821 are provided on the outer peripheral surface of the second limiting member 80. The first positioning block 811 and the second positioning block 821 are spaced apart along the axial direction of the second limiting member 80 and are used to jointly clamp the main drive member 31.

[0074] Specifically, the proximal end of the second limiting member 80 is connected to the connector 60, thereby fixing the relative position of the second limiting member 80 and the rear end cover 13 along the axial direction of the tube body 20. The distal end of the second limiting member 80 is provided with two elastic portions 81 spaced apart in the circumferential direction, and the outer surface of the distal end of each elastic portion 81 is provided with a first positioning block 811. The inner wall surface of the through hole of the second connecting portion 312 is also provided with a second annular portion 314 (see reference). Figure 3 The second annular portion 314 also has a through hole at its center, thus forming a stepped hole inside the second connecting portion 312. The elastic portion 81 can deform under the radial compressive force of the second annular portion 314, allowing it to be inserted into the through hole of the second annular portion 314 and positioning the first positioning block 811 at the distal end of the second annular portion 314. The second limiting member 80 also has a third annular portion 82, on the surface of the third annular portion 82 facing the elastic portion 81, with a second positioning block 821. The distance between the first positioning block 811 and the second positioning block 821 is approximately equal to the thickness of the second annular portion 314. The second annular portion 314 is inserted between the first positioning block 811 and the second positioning block 821 and can rotate relative to them, thereby fixing the relative position of the main driving member 31 and the second limiting member 80 along the axial direction of the tube body 20.

[0075] Furthermore, combined Figure 3 , Figure 5 and Figure 8 As shown, to ensure that the main drive component 31, the tube body 20, and the rear end tube 13 do not move axially relative to the housing 11 and to ensure the overall structural stability of the handle 10, the inner wall of the housing 11 is provided with an annular positioning protrusion. Specifically, the inner wall of the first housing 111 has a semi-annular first positioning protrusion 1115, and the inner wall of the second housing 112 has a semi-annular second positioning protrusion. The first positioning protrusion 1115 and the second positioning protrusion together form a complete annular positioning protrusion. The first annular portion 313 of the main drive component 31 abuts against the distal side of the positioning protrusion, thereby restricting the main drive component 31 from moving towards the proximal end of the adjustable curved sheath 1. Simultaneously, the rear end 13 is inserted into the second gap of the rotating component 50, thereby restricting the main drive component 31 from moving towards the distal end of the adjustable curved sheath 1, thus fixing the main drive component 31 relative to the housing 11 in the axial direction, preventing the main drive component 31 and the tube body 20 from moving relative to the housing 11 along the axial direction of the tube body 20.

[0076] In some embodiments of the present invention, the driving device of the present invention may further include at least one driving member, the at least one driving member moving along the axial direction of the tube body 20, and the first traction member 41 and / or the second traction member 42 being connected to at least one driving member.

[0077] Specifically, there can be two driving components, including a first driving component and a second driving component. The first traction component 41 is connected to the first driving component, and the second traction component 42 is connected to the second driving component. Both the first driving component and the second driving component can be sliders that move along the axial direction of the tube 20. The outer circumferential surface of the tube 20 or the inner sidewall of the housing 11 is provided with slide rails that cooperate with the sliders. Thus, the linear movement of the first driving component and the second driving component pulls the first traction component 41 and the second traction component 42 to move, thereby adjusting the bending condition of the tube 20.

[0078] In some embodiments of the present invention, the driving device of the present invention may further include a transmission assembly and a driving member, one of the first traction member 41 and the second traction member 42 is connected to the transmission assembly and is pulled by the rotation of the transmission assembly, and the other of the first traction member 41 and the second traction member 42 is connected to the driving member and is pulled by the linear motion of the driving member.

[0079] The present invention also provides another embodiment, see below. Figures 17 to 19 The rotating component 50 includes an operating part 51 and a transmission part 52 connected together. The transmission part 52 includes a first transmission part 522 and a second transmission part 523, with the diameter of the first transmission part 522 being larger than the diameter of the second transmission part 523. The proximal end of the first traction member 41 sequentially passes through the tube body 20, the second transmission part 523, and the first transmission part 522, and connects to the outer surface of the first transmission part 522. The proximal end of the second traction member 42 sequentially passes through the tube body 20 and the second transmission part 523, and connects to the outer surface of the second transmission part 523. When the operating part 51 is rotated, the first traction member 41 winds around the outer surface of the first transmission part 522, and the second traction member 42 winds around the outer surface of the second transmission part 523. In this embodiment, the movement of the first traction member 41 and the second traction member 42 only needs to be controlled by the rotating component 50; no other driving device is required.

[0080] The second transmission part 523 is disposed within the first transmission part 522. The connection between the first transmission part 522 and the second transmission part 523 is that the first transmission part 522 and the second transmission part 523 are respectively connected to the operating part 51, or connected by a connector and then connected to the operating part 51, or the first transmission part 522 and the second transmission part 523 are axially connected.

[0081] In one embodiment, the outer surfaces of the first transmission part 522 and the second transmission part 523 are both provided with spiral grooves, which makes it easier for the first traction member 41 and the second traction member 42 to wind around.

[0082] Furthermore, according to this winding method, in some embodiments of the present invention, the driving device 30 may also include only one main driving member 31, which is sleeved on the outside of the tube body 20 in a manner rotatable about the axis of the tube body 20. The proximal ends of the first traction member 41 and the second traction member 42 are respectively connected to the main driving member 31. When the main driving member 31 rotates, the first traction member 41 and the second traction member 42 can be wound around the outer surface of the main driving member 31, thereby adjusting the length of the first traction member 41 and the second traction member 42, and thus adjusting the bending state of the tube body 20. At this time, the diameters of the proximal and distal portions of the main driving member 31 can be set to be different, with the proximal end of the first traction member 41 located at the larger diameter position and the proximal end of the second traction member 42 located at the smaller diameter position.

[0083] Another aspect of the present invention provides a conveying system having the adjustable curved sheath 1 of any of the above embodiments. Since the conveying system has the same technical features as the adjustable curved sheath 1 of any of the above embodiments, it can achieve the same technical effect, and will not be described in detail here.

[0084] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An adjustable bending sheath, characterized in that, include: The pipe body is provided with a bending section. The bending section has a first side and a second side that are arranged opposite to each other in the bending state. The first side is located inside the bending direction of the bending section, and the second side is located outside the bending direction of the bending section. The first traction member has its distal end connected to the distal end of the first side, and its proximal end extends to the outside of the tube body. The second traction member has its distal end connected to the proximal end of the second side, and the proximal end of the second traction member extends to the outside of the tube body. When the first traction member is configured to be pulled toward the proximal end, it causes the bending section to bend and deform toward the first side, and the portion of the tube located on the proximal side of the bending section tends to bend and deform toward the first side. When the second traction member is configured to be pulled toward the proximal end, it causes the portion of the tube on the proximal side of the bending section to bend and deform toward the second side, thereby counteracting the tendency to bend and deform toward the first side.

2. The adjustable bending sheath according to claim 1, characterized in that, The adjustable bending sheath also includes a driving device, wherein the proximal end of the first traction member and / or the proximal end of the second traction member are connected to the driving device, and the driving device is rotatably sleeved on the outside of the tube body, and drives the first traction member and / or the second traction member to move along the axial direction of the tube body by rotating itself.

3. The adjustable bending sheath according to claim 2, characterized in that, The driving device includes a main driving member and at least one transmission component. The main driving member is sleeved on the outside of the tube body in a manner that allows it to rotate around the axis of the tube body. The proximal end of the first traction member and / or the proximal end of the second traction member is connected to the at least one transmission component, and the at least one transmission component is drively connected to the main driving member.

4. The adjustable bending sheath according to claim 3, characterized in that, The transmission assembly includes at least a gear, and the outer peripheral surface or distal end surface of the main drive member is provided with a rack distributed in a circumferential direction, and the gear meshes with the rack.

5. The adjustable bending sheath according to claim 4, characterized in that, The transmission assembly further includes a traction wheel, which is connected to one end of the gear and rotates together with the gear. The first traction member and / or the second traction member are connected to the traction wheel and are wound around the outer circumference of the traction wheel while the traction wheel is rotating.

6. The adjustable bending sheath according to claim 5, characterized in that, The outer circumferential surface of the traction wheel is provided with an annular groove, and the first traction member and / or the second traction member can be wound around the annular groove.

7. The adjustable bending sheath according to claim 5, characterized in that, The driving device includes a first transmission component and a second transmission component. The first transmission component is provided with a first gear and a first traction wheel connected to the first gear. The second transmission component is provided with a second gear and a second traction wheel connected to the second gear. The outer peripheral surface or distal end face of the main driving member is provided with a rack distributed in a circumferential direction. The gear meshes with the rack. The first gear and the second gear are respectively meshed with the rack. The proximal end of the first traction member is connected to the first traction wheel. The proximal end of the second traction member is connected to the second traction wheel. The diameter of the first traction wheel is larger than the diameter of the second traction wheel.

8. The adjustable bending sheath according to claim 7, characterized in that, The outer circumferential surface of the traction wheel is provided with an annular groove, and the first traction member and / or the second traction member can be wound around the annular groove.

9. The adjustable bending sheath according to claim 3, characterized in that, The adjustable bending sheath also includes a handle and a rotating component. The driving device and part of the tube body are located inside the handle. The rotating component includes a connected operating part and a transmission part. The transmission part is sleeved inside the handle in a manner that allows it to rotate around the axis of the tube body and is connected to the main driving component for driving the main driving component to rotate around the axis of the tube body. At least part of the operating part extends outside the handle.

10. The adjustable bending sheath according to claim 9, characterized in that, The adjustable curved sheath further includes a first limiting member, which is used to connect the tube body and the handle and fix the relative position of the tube body and the handle in the circumferential direction of the tube body; and / or, the adjustable curved sheath further includes a second limiting member, which is fixedly disposed inside the handle and sleeved between the tube body and the main drive member. The outer circumferential surface of the second limiting member is provided with a first positioning block and a second positioning block. The first positioning block and the second positioning block are spaced apart in the axial direction of the second limiting member and are used to clamp the main drive member together.

11. The adjustable bending sheath according to claim 1, characterized in that, The adjustable bending sheath also includes a driving device, which includes at least one driving member that moves along the axial direction of the tube body, and the first traction member and / or the second traction member are connected to the at least one driving member.

12. The adjustable bending sheath according to claim 1, characterized in that, The adjustable curved sheath also includes a rotating component, which includes a connected operating part and a transmission part. The transmission part includes a first transmission part and a second transmission part. The diameter of the first transmission part is larger than the diameter of the second transmission part. The proximal end of the first traction member is connected to the outer surface of the first transmission part, and the proximal end of the second traction member is connected to the outer surface of the second transmission part. When the operating part is rotated, the first traction member is wound around the outer surface of the first transmission part, and the second traction member is wound around the outer surface of the second transmission part.

13. The adjustable bending sheath according to claim 12, characterized in that, The second transmission part is disposed within the first transmission part.

14. The adjustable bending sheath according to claim 12, characterized in that, Both the outer surface of the first transmission part and the outer surface of the second transmission part are provided with spiral grooves.

15. A conveying system, characterized in that, It has an adjustable bendable sheath according to any one of claims 1 to 14.

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