Pull ring assembly, first pull ring body, second pull ring body and bend-adjusting sheath

Abstract

The application provides a pull ring assembly, a first pull ring body, a second pull ring body and a bending adjustment sheath, and relates to the technical field of medical devices. The pull ring assembly comprises: the first pull ring body, which is provided with a plurality of abutting pieces protruding to the distal side, and the two sides of the abutting pieces are provided with pull wire holes penetrating through the first pull ring body in the axial direction; the second pull ring body is located on the distal side of the first pull ring body, and the second pull ring body has a bearing part opposite to the pull wire hole. The bending wire is arranged in the pull wire hole, so that when the first free end and the second free end of the bending wire extend to the outside of the first pull ring body, the first free end and the second free end can move along the up-down direction of the pull wire hole, the problem of high welding difficulty can be avoided, and the tensile performance can be ensured.

Description

Technical Field

[0001] This application relates to the field of interventional medical device technology, and more specifically, to an interventional bending sheath and its pull-cord assembly. Background Technology

[0002] With the improvement of people's living standards, the incidence of cardiovascular diseases is gradually increasing. The treatment of cardiovascular diseases involves the protection of various vital organs throughout the body, including the brain, spinal cord, lungs, and liver, making the procedure difficult, with a high complication rate and unsatisfactory treatment outcomes. A common treatment approach is to introduce stent technology into elephant trunk surgery, building upon endovascular aortic intervention. This involves lining the distal end of an artificial blood vessel with a self-expanding metal stent, and then using a delivery system to implant the stent-supported elephant trunk vessel into the distal end of the descending aorta via an incision in the aortic arch or the proximal descending aorta. After release, the proximal end of the stent-supported elephant trunk artificial blood vessel is anastomosed to the reconstructed aortic arch. When the delivery system passes through the aortic arch, because the aortic arch is curved, the head of the delivery system needs to bend to pass smoothly.

[0003] A bending sheath is a sheath assembly used in interventional and minimally invasive surgical procedures. It consists of two parts: a sheath and a sheath core. By operating a handle at the proximal end of the sheath, the distal end of the sheath can be bent within a certain angle range. After the distal end of the sheath is bent, the tip of the sheath can be pointed towards the target location, which facilitates the surgical operation of the bending path during the operation.

[0004] In adjustable sheaths, using a soft pull wire to pull the distal end of the sheath to adjust its bending is an important method. The distal end of the sheath is usually equipped with a rigid pull ring, and the soft pull wire is fixed to the rigid pull ring. Welding this rigid pull ring is difficult, and it is not only prone to breakage, causing the product to fail to adjust its bending function and have weak tensile strength, but also causes the main body of the sheath to exhibit an arching phenomenon. The arching becomes more obvious as the bending angle increases, leading to inaccurate bending angle, excessive bending stroke loss, and increased bending resistance. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a bending sheath tube and its pull-line ring assembly that can overcome large bending resistance.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a pull ring assembly, comprising: a first pull ring body having a plurality of abutment members protruding toward the distal end, wherein both sides of the abutment members are provided with pull holes that penetrate the first pull ring body in the axial direction; and a second pull ring body located at the distal end of the first pull ring body, wherein the second pull ring body has a bearing portion opposite to the pull holes.

[0008] In the above solution, the pull ring assembly includes a first pull ring body and a second pull ring body. The first pull ring body provides a pull hole for the bending wire to pass through. The second pull ring body is connected to the first pull ring body and provides a support portion opposite to the pull hole. When the bending wire is provided in the pull hole of the first pull ring body, the bending wire can move along the vertical direction of the pull hole. At the same time, the support portion and the abutment can limit the bending wire, so that the bending wire will not come out of the first pull ring body during the pulling and pushing process. This not only achieves the bending effect, but also ensures higher tensile strength, reduces the loss of bending stroke, and overcomes the large bending resistance.

[0009] In some embodiments, a plurality of receiving grooves are provided on the distal end of the first pull ring body, each of the abutting members is located in one of the receiving grooves, and the pull wire holes on both sides of each abutting member are connected to the corresponding receiving groove.

[0010] In the above scheme, the receiving groove is provided with abutment and pull wire hole. The bending line is passed through the pull wire hole, so that when the bending line moves up and down along the pull wire hole, the pull wire hole and the abutment can limit the bending line, ensuring the normal movement of the bending line, overcoming the problem of high welding difficulty, realizing multi-directional bending under high tensile conditions, and at the same time, each bending direction is independent of each other and does not affect each other.

[0011] In some embodiments, the receiving groove with an opening is provided axially recessed on the distal side of the first pull ring body.

[0012] In some embodiments, the pull ring assembly includes at least two bending wires, each bending wire passing through a receiving groove through pull holes on both sides of the same abutment member, and each bending wire abutting against the bearing portion to hold the second pull ring body.

[0013] In the above scheme, the bending line is respectively inserted through the pull hole on both sides of the abutment, so that when the bending line abuts the abutment, its two ends extend to the outer edge of the first pull ring body. When the bending handle is bent through the bending line, under the action of the abutment and the second pull ring body, the bending line can be guaranteed to have higher tensile strength during the movement, thereby overcoming the greater bending resistance.

[0014] In some embodiments, the two bending lines are located on opposite sides of the diameter of the first pull ring body.

[0015] In some embodiments, a first latching portion is provided at the distal end of the first pull ring body, and a second latching portion is provided in the second pull ring body, wherein the first latching portion is configured to connect with the second latching portion.

[0016] In the above solution, the first snap-fit ​​part and the second snap-fit ​​part cooperate to realize the connection and disassembly of the second pull ring body and the first pull ring body, and at the same time, it can ensure that when the second pull ring body and the first pull ring body are connected, the bending wire is prevented from coming off the first pull ring body.

[0017] In some embodiments, the first snap-fit ​​portion includes a snap-fit ​​groove, and the second snap-fit ​​portion includes a snap-fit ​​block. The snap-fit ​​groove is configured to accommodate at least a portion of the snap-fit ​​block. By adapting the snap-fit ​​groove and the snap-fit ​​block, the efficiency of connecting or disconnecting the second pull ring body from the first pull ring body can be improved, ensuring that the second pull ring body will not detach from the first pull ring body.

[0018] In some embodiments, a gap is formed between every two adjacent receiving slots, and the snap-fit ​​groove is disposed on the gap. By making the snap-fit ​​groove open, the second pull ring body can be easily screwed into or out of the first pull ring body, and the adjustment of the second pull ring body can also be facilitated, thereby improving its efficiency.

[0019] In some embodiments, the snap-fit ​​groove includes a first cavity and a second cavity that are interconnected. The cross-sectional dimension of the first cavity is smaller than that of the second cavity. The first cavity is closer to the distal end of the first pull ring body than the second cavity, and the first cavity penetrates the first pull ring body in the direction toward the second pull ring body to form a groove. Both the first cavity and the second cavity are connected to the receiving groove.

[0020] In some embodiments, the snap-fit ​​block includes a connector and a snap-fit ​​body that are connected to each other, and the cross-sectional dimension of the snap-fit ​​body is larger than the cross-sectional dimension of the connector; the connector is connected to the proximal end of the second pull ring body, the snap-fit ​​body is connected to the connector, and the snap-fit ​​body is screwed into or out of the second cavity from the receiving groove, and the connector is screwed into or out of the first cavity from the receiving groove.

[0021] Secondly, this application also provides a first pull ring body, which is provided with several abutment members protruding towards the distal end. Each abutment member has a pull wire hole on both sides that extends axially through the first pull ring body. By providing abutment members on the first pull ring body, and having pull wire holes on both sides of each abutment member, it is convenient for the bending wire to pass through the pull wire holes, which facilitates the bending action of the bending handle and also ensures that the bending wire has higher tensile strength.

[0022] In some embodiments, the receiving groove with an opening is provided axially recessed on the distal side of the first pull ring body.

[0023] In some embodiments, a first snap-fit ​​portion is provided on the distal end of the first pull ring body.

[0024] In some embodiments, the first snap-fit ​​portion includes a snap-fit ​​groove, and a spacer is formed between every two adjacent receiving grooves, the snap-fit ​​groove being disposed on the spacer.

[0025] Thirdly, this application also provides a second pull ring body, which can be connected to the first pull ring body as described above. The second pull ring body is located at the distal end of the first pull ring body, and has a receiving portion opposite to the pull hole of the first pull ring body. By connecting the second pull ring body to the first pull ring body and providing the receiving portion on the second pull ring body, when an adjustment line is provided on the first pull ring body, it can be limited by the receiving portion.

[0026] In some embodiments, the second pull ring body is provided with a second snap-fit ​​portion.

[0027] In some embodiments, the second snap-fit ​​portion includes a snap-fit ​​block, the snap-fit ​​block including a connector and a snap-fit ​​body connected to each other, and the cross-sectional dimension of the snap-fit ​​body is larger than the cross-sectional dimension of the connector; the connector is connected to the proximal side of the first pull ring body, and the snap-fit ​​body is configured to be connected to both the connector and the first pull ring body.

[0028] Fourthly, this application also provides a bending sheath, including a pull ring assembly as described in any of the preceding claims or a first pull ring body as described above.

[0029] The bending sheath provided in the fourth aspect of this application includes the pull ring assembly described in the first aspect of the technical solution or the first pull ring body described in the second aspect of the technical solution, and therefore has all the technical effects of the above embodiments, which will not be repeated here.

[0030] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For users of ordinary skills in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a schematic diagram of the structure of a drawstring assembly disclosed in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a pull ring assembly disclosed in an embodiment of this application from another perspective;

[0034] Figure 3 This is a front view of a drawstring assembly disclosed in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the structure of the first pull ring body of a pull ring assembly disclosed in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram showing the connection between the first pull ring body and the bending line of a pull ring assembly disclosed in this application.

[0037] Figure Labels

[0038] 100. Pull ring assembly; 101. First pull ring body; 1011. Abutment; 1012. Pull hole; 1013. Receiving groove; 1014. First snap-fit ​​part; 102. Second pull ring body; 1021. Second snap-fit ​​part; 10211. Connector; 10212. Snap-fit ​​body; 200. Adjusting line. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by users of ordinary skill in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used 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. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Example 1

[0046] In this application, the distal end refers to the end of the sheath that is close to the patient's heart or the end that is far from the surgeon's operation. The proximal end is the opposite of the distal end, referring to the end that is far from the patient's heart or the end that is close to the surgeon's operation. In other words, the proximal end can be used to set the bending handle.

[0047] like Figures 1-3As shown, in a first aspect, this application provides a pull ring assembly 100, including: a first pull ring body 101 and a second pull ring body 102. The first pull ring body 101 is provided with a plurality of abutment members 1011 protruding to the distal end. Each abutment member 1011 has a pull hole 1012 on both sides. The pull hole 1012 is configured to penetrate along the vertical direction (i.e., axial direction) of the first pull ring body 101. The second pull ring body 102 is located at the distal end of the first pull ring body 101. The second pull ring body 102 has a bearing portion opposite to the pull hole. The bearing portion refers to the part on the second pull ring body used to contact the bending line and thus bear the thrust of the bending line. In this embodiment, the bearing portion is part of the second pull ring body 102 and has no protrusion or recess. However, in other embodiments, a protrusion or recess can be provided on the second pull ring body 102 to form the bearing portion.

[0048] A bending line 200 can be provided on the first pull ring body 101 of the pull ring assembly. When the bending line 200 moves or passes through the pull hole, it is U-shaped. It should be noted that the shape of the bending line 200 before passing through the pull hole can be straight, arc-shaped, etc. For example, when the bending line 200 is made of stainless steel, it forms a U-shape after passing through the first pull ring body 101. In this application, the wire material used for the bending line 200 needs to have a certain rigidity in the axial direction, i.e., the extension direction of the wire, to ensure that the formed bending line 200 can withstand and transmit axial thrust. Furthermore, the wire material used for the bending line 200 also needs to be flexible, i.e., it can be bent in the direction perpendicular to the axial direction, so that the formed bending line 200 can pass through the pull hole and withstand tension. In other embodiments, the bending wire 200 can be made of nickel-titanium wire. Since the bending wire 200 not only has a certain degree of flexibility but also has high structural strength, when the bending wire 200 cooperates with the first pull ring body 101, after the bending wire 200 is first formed into a "U" shape, it can not only complete the bending wire 200 to be threaded into the first pull ring body 101, but also ensure that the bending wire 200 completes the push and pull process, overcoming a large bending resistance. At the same time, the first pull ring body 101 can also limit its movement, ensuring that the bending wire 200 always wraps around the first pull ring body 101 during the movement.

[0049] For example, the first pull ring body 101 can be configured as a cylinder, and the second pull ring body 102 can also be configured as a cylinder. The outer dimensions of the first pull ring body 101 and the outer dimensions of the second pull ring body 102 can be the same or different. When the second pull ring body 102 is connected to the first pull ring body 101, a closed receiving groove 1013 can be formed to ensure that when the bending line 200 performs a push and pull movement, the bearing part and the abutting member 1011 of the second pull ring body 102 respectively limit the bending line 200.

[0050] At least two bending lines 200 are provided, arranged opposite each other. Each bending line 200 passes through the pull holes 1012 on both sides of the abutment member 1011, so that the bending line 200 abuts against the bearing portion of the second pull ring body 102 to hold the second pull ring body 102. Its proximal end extends to the outside of the first pull ring body 101 and connects to the bending handle. In this embodiment, there are four bending lines 200, which are spaced apart and passed through the pull holes (for example, the four bending lines 200 are equally spaced through the pull holes). The four bending lines 200 are arranged in two groups, with two bending lines 200 in each group arranged opposite each other, so that one bending line 200 in the same group performs the pushing process, and the other bending line 200 performs the pulling process.

[0051] For example, the abutment 1011 can be configured as an arc shape. The abutment 1011 can be integrally formed with the first pull ring body 101 using an integral molding process (for example, the abutment 1011 can be formed by directly processing the distal side of the first pull ring body 101). Of course, other fixing methods can also be used, such as welding. By fixing through an integral molding process or other fixing methods, when the bending line 200 is respectively inserted through the pull hole 1012 on both sides of the abutment 1011 and performs a push-pull movement, the bending handle applies a pulling force to the bending line 200, and the abutment 1011 contacts the bending line 200, thereby limiting the bending line 200 and preventing the bending line 200 from experiencing excessive local stress during movement.

[0052] The bending cable 200 passes through the pull holes 1012 on both sides of the same abutment member 1011, and extends from the pull holes 1012 to the outside of the first pull ring body 101 to form the first free end and the second free end. The first free end and the second free end are both located on the same side (proximal end side) of the first pull ring body 101. It can be understood that in actual use, the bending handle of the bending cable 200 is connected to the first free end and the second free end respectively, and the first pull ring is... A pulling force is applied to the first free end and the second free end of the bending line 200 on one side of the main body 101, causing the bending line 200 to move relative to the first pull ring main body 101. At the same time, the bending handle applies a pulling or pushing force to the first free end and the second free end of the bending line 200 on the other side of the first pull ring main body 101. Thus, through the cooperation between the two bending lines 200, the two bending lines 200 can move relative to the first pull ring main body 101, thereby achieving the bending of the bending sheath.

[0053] In the above scheme, one end of the bending wire 200 passes through one of the pull wire holes 1012 and around the abutment member 1011, and exits from the other pull wire hole 1012. When the first free end and the second free end of the bending wire 200 extend to the outside of the first pull ring body 101 (i.e. the outer edge of the proximal side of the first pull ring body 101), both the first free end and the second free end can move along the vertical direction of the pull wire hole 1012. It has higher tensile strength, can overcome greater bending resistance, and ensure its tensile strength while avoiding the problem of difficult welding.

[0054] like Figure 4 As shown, a receiving groove 1013 is provided on the distal side of the first pull ring body 101. Each receiving groove 1013 is configured to accommodate the abutment 1011, and the pull holes 1012 on both sides of each abutment 1011 communicate with the corresponding receiving groove 1013. For example, the first pull ring body 101 is vertically distributed, and the bottom portion of the first pull ring body 101 is recessed to form the receiving groove 1013. The size of the receiving groove 1013 can be set according to the actual design size and spacing of the abutment 1011 and the pull holes 1012.

[0055] In the above scheme, the receiving groove 1013 is provided with an abutment 1011 and a pull wire hole 1012. The bending wire 200 passes through the pull wire hole 1012, so that when the bending wire 200 moves up and down along the pull wire hole 1012, the pull wire hole 1012 and the abutment 1011 can limit the bending wire 200, ensuring the normal movement of the bending wire 200.

[0056] Please refer to again Figure 4 The receiving grooves 1013 are arranged at intervals along the periphery of the first pull ring body 101. The receiving grooves 1013 can be arranged at equal intervals, and their specific number can be set according to the actual situation. For example, four receiving grooves 1013 are provided. Every two receiving grooves 1013 are arranged opposite each other, and the bending lines 200 in the two opposite receiving grooves cooperate to achieve a bending direction. That is, the bending handle applies a pulling force to the bending line 200 in one receiving groove and a pushing force to the bending line 200 in the other receiving groove (the two receiving grooves are arranged opposite each other). No force is applied to the bending lines 200 in the remaining two receiving grooves, thus achieving bending in one direction. In this way, by providing multiple receiving grooves 1013 in the first pull ring body 101, multi-directional bending under high tension is achieved. At the same time, each bending direction is independent of each other and does not affect each other.

[0057] In some embodiments, the distal end of the first pull ring body 101 is recessed along the vertical direction (axial direction) to form an open receiving groove 1013. It should be noted that the opening of the receiving groove 1013 faces downwards, and the first and second free ends of the bending cable 200 pass through the pull wire holes 1012 on both sides of the abutment member 1011 of the receiving groove 1013 and are inserted into the proximal end of the first pull ring body 101 for connection with the bending handle. In other embodiments, the receiving groove 1013 may be configured as an annular hole, i.e., extending through the sidewall of the first pull ring body 101 to its vertical centerline to form a receiving groove 1013 with an abutment portion at the bottom (i.e., the bottom of the receiving groove 1013 does not have the opening), which can limit the pushing force of the bending cable 200 and prevent the bending cable 200 from dislodging from the first pull ring body 101.

[0058] In some embodiments, a first snap-fit ​​portion 1014 is provided at the distal end of the first pull ring body 101, and a second snap-fit ​​portion 1021 is provided for the second pull ring body 102. The abutment portion is formed between two adjacent second snap-fit ​​portions 1021. The first snap-fit ​​portion 1014 is configured to connect with the second snap-fit ​​portion 1021, that is, the first pull ring body 101 and the second pull ring body 102 are snap-fitted together. Of course, other connection methods are not excluded. For example, the second pull ring body 102 is screwed onto the first pull ring body 101 by means of threads, as long as it can limit the bending line 200.

[0059] In the above scheme, the first snap-fit ​​part 1014 and the second snap-fit ​​part 1021 cooperate to realize the connection and disassembly of the second pull ring body 102 and the first pull ring body 101, and at the same time, it can ensure that when the second pull ring body 102 is connected to the first pull ring body 101, the bending wire 200 is prevented from coming off the first pull ring body 101.

[0060] Please refer to again Figures 1-2 The first snap-fit ​​portion 1014 includes a snap-fit ​​groove, and the second snap-fit ​​portion 1021 includes a snap-fit ​​block. The snap-fit ​​groove is configured to accommodate at least a portion of the snap-fit ​​block. Specifically, the first snap-fit ​​portion 1014 is disposed on the distal end of the first pull ring body 101, and the receiving groove 1013 is disposed on the distal end of the first pull ring body 101. The first snap-fit ​​portion 1014 and the receiving groove 1013 are staggered to form a first snap-fit ​​portion 1014 between two adjacent receiving grooves 1013. When assembling the first snap-fit ​​portion 1014 and the second snap-fit ​​portion 1021, the second snap-fit ​​portion 1021 is first aligned with the receiving groove 1013, and then screwed into the first snap-fit ​​portion 1014. Since there are several receiving grooves 1013, the second snap-fit ​​portion 1021 can be screwed into or out of the first snap-fit ​​portion 1014 from any one of the receiving grooves 1013. This can improve the efficiency of connecting or disassembling the second pull ring body 102 and the first pull ring body 101, and ensure that the second pull ring body 102 will not fall off the first pull ring body 101.

[0061] Please refer to again Figure 4 The snap-fit ​​groove is disposed on the periphery of the first pull ring body 101, and each of the receiving grooves 1013 divides the snap-fit ​​groove into two sections (i.e., a gap is formed between every two adjacent receiving grooves 1013, and the snap-fit ​​groove is disposed on the gap). The snap-fit ​​groove includes a first cavity and a second cavity that are interconnected. The cross-sectional dimension of the first cavity is smaller than that of the second cavity. The first cavity is closer to the far end of the first pull ring body than the second cavity. The first cavity has a slot (i.e., a first slot). The second cavity has a second slot. The opening direction of the first slot is set to face the second pull ring body 102, and the opening direction of the second slot is set to face the receiving groove 1013. The first slot of the snap-fit ​​groove is used to avoid the connector 10211 of the snap-fit ​​block, and the second slot is used for the connector 10211 of the snap-fit ​​block to screw into or out of the snap-fit ​​groove 101. By making the snap-fit ​​groove open, the second pull ring body 102 can be easily screwed into or out of the first pull ring body 101, and the second pull ring body 102 can be easily adjusted, thus improving its efficiency.

[0062] In some embodiments, at least two snap-fit ​​blocks may be provided, and the two snap-fit ​​blocks are symmetrically distributed on the second pull ring body 102. Each snap-fit ​​block includes a connecting body 10211 and a snap-fit ​​body 10212 connected to each other. The connecting body 10211 is connected to the second pull ring body 102. The cross-sectional dimension of the snap-fit ​​body 10212 is larger than that of the connecting body 10211. The snap-fit ​​body 10212 is located on the side of the connecting body 10211 away from the second pull ring body 102, and the middle position of the snap-fit ​​body 10212 is connected to the connecting body 10211. The connector 10212 is screwed into or out of the second cavity from the receiving groove, and the connector 10211 is screwed into or out of the first cavity from the receiving groove 1013. The connection between the connector 10211 and the snap-fit ​​body 10212 can be integrally formed or welded. After the connector 10211 and the snap-fit ​​body 10212 are connected to form a whole, the snap-fit ​​block forms a "T" shape, etc., and the side of the snap-fit ​​body 10212 away from the connector 10211 is set in the snap-fit ​​groove so that the snap-fit ​​body 10212 and the snap-fit ​​groove form a snap-fit.

[0063] Example 2

[0064] In some embodiments, such as Figure 4 As shown, the first pull ring body is provided with several abutment members protruding towards the distal end. Both sides of the abutment members are provided with pull wire holes that penetrate the first pull ring body in the axial direction. The distal end of the first pull ring body is recessed along the axial direction to form an open receiving groove. The distal end of the first pull ring body is provided with a first locking part, which includes a locking groove. The locking groove is provided on the periphery of the first pull ring body 101. Each receiving groove 1013 divides the locking groove into two segments (i.e., a gap is formed between every two adjacent receiving grooves 1013, and the locking groove is provided on the gap). The locking groove includes a first cavity and a second cavity that are interconnected. The cross-sectional size of the first cavity is smaller than that of the second cavity. The first cavity is closer to the distal end of the first pull ring body 101 than the second cavity. The first cavity is provided with a first slot facing the second pull ring body 102, and the second cavity is provided with a second slot facing the receiving groove. That is, in actual use, the first pull ring body 101 has the bending adjustment wire 200 inserted in its pull wire hole 1012. The connection method of the bending adjustment wire 200 is the same as that in the above embodiment. The first pull ring body 101 can also be provided with two sets of bending directions. Each set of bending directions corresponds to two bending adjustment wires 200 and four pull wire holes, respectively. The two bending adjustment wires 200 are arranged opposite to each other on the first pull ring body 101.

[0065] Example 3

[0066] In some embodiments, the second pull ring body 102 can be used to connect with the first pull ring body 101. The second pull ring body 102 is located at the distal end of the first pull ring body. The second pull ring body 102 has a bearing portion opposite to the pull hole of the first pull ring body 101. The first pull ring body 101 is provided with a first snap-fit ​​portion, and one end of the second pull ring body 102 is provided with a second snap-fit ​​portion that connects to the first snap-fit ​​portion. The specific structural forms of the first snap-fit ​​portion and the second snap-fit ​​portion are not particularly limited. For example, the second snap-fit ​​portion includes a snap-fit... The connecting block includes a connecting body 10211 and a snap-fit ​​body 10212 connected to each other. The connecting body 10211 is connected to the second pull ring body 102. The cross-sectional dimension of the snap-fit ​​body 10212 is larger than that of the connecting body 10211. The snap-fit ​​body 10212 is located on the side of the connecting body 10211 away from the second pull ring body 102, and the middle part of the snap-fit ​​body 10212 is connected to the connecting body 10211, etc., as long as it can realize the detachable connection between the first pull ring body 101 and the second pull ring body 102.

[0067] Example 4

[0068] In some embodiments, this application also provides a bending sheath, including a pull ring assembly 100 or a first pull ring body 101; that is, the bending sheath can complete the bending process by setting a bending line 200 on the first pull ring body and detachably connecting a second pull ring body 102 to the first pull ring body 101, or the bending process can be completed by directly setting a bending line 200 on the first pull ring body 101.

[0069] Since the bending sheath provided in the second aspect of this application includes the pull ring assembly 100 described in the first aspect of the technical solution, it has all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drawstring assembly, characterized in that, include: The first pull ring body is provided with several abutting members that protrude to the distal end, and each abutting member has a pull wire hole that penetrates the first pull ring body in the axial direction on both sides. The second pull ring body is located at the distal end of the first pull ring body, and the second pull ring body has a bearing portion opposite to the pull wire hole; The distal end of the first pull ring body is provided with an axially recessed receiving groove with an opening; the distal end of the first pull ring body is provided with a first snap-fit ​​portion, the first snap-fit ​​portion including a snap-fit ​​groove, and a gap portion is formed between every two adjacent receiving grooves, the snap-fit ​​groove being disposed on the gap portion.

2. The draw ring assembly according to claim 1, characterized in that, The distal end of the first pull ring body is provided with several receiving grooves, each of the abutting members is located in one of the receiving grooves, and the pull wire holes on both sides of each abutting member are connected to the corresponding receiving groove.

3. The draw ring assembly according to claim 2, characterized in that, The second pull ring body is provided with a second snap-fit ​​part, and the first snap-fit ​​part is configured to connect with the second snap-fit ​​part.

4. The draw ring assembly according to claim 3, characterized in that, The second snap-fit ​​portion includes a snap-fit ​​block, and the snap-fit ​​groove is configured to accommodate at least a portion of the snap-fit ​​block.

5. The draw ring assembly according to claim 4, characterized in that, The snap-fit ​​groove includes a first cavity and a second cavity that are interconnected. The cross-sectional dimension of the first cavity is smaller than that of the second cavity. The first cavity is closer to the distal end of the first pull ring body than the second cavity, and the first cavity penetrates the first pull ring body in the direction of the second pull ring body to form a groove. Both the first cavity and the second cavity are connected to the receiving groove.

6. The draw ring assembly according to claim 5, characterized in that, The snap-fit ​​block includes a connector and a snap-fit ​​body that are connected to each other, and the cross-sectional dimension of the snap-fit ​​body is larger than that of the connector; the connector is connected to the proximal end of the second pull ring body, the snap-fit ​​body is connected to the connector, and the snap-fit ​​body is screwed into or out of the second cavity from the receiving groove, and the connector is screwed into or out of the first cavity from the receiving groove.

7. The drawstring assembly according to any one of claims 1 to 6, characterized in that, The pull ring assembly includes at least two bending wires, each of which passes through a receiving groove through the pull holes on both sides of the same abutment member, and each of the bending wires can abut against the abutment portion to hold the second pull ring body.

8. The draw ring assembly according to claim 7, characterized in that, The two bending lines are located on opposite sides of the diameter of the first pull ring body.

9. A first pull ring body, characterized in that, The first pull ring body is provided with several abutment members protruding towards the distal end. Both sides of the abutment members are provided with pull wire holes that penetrate the first pull ring body in the axial direction. The distal end of the first pull ring body is provided with an axially recessed receiving groove. The distal end of the first pull ring body is provided with a first locking part, which includes a locking groove. A gap is formed between every two adjacent receiving grooves, and the locking groove is provided on the gap.

10. A second pull ring body, characterized in that, The second pull ring body can be used to connect with the first pull ring body as described in claim 9, the second pull ring body is located at the distal end of the first pull ring body, and the second pull ring body has a bearing portion opposite to the pull hole of the first pull ring body; The second pull ring body is provided with a second snap-fit ​​portion, the second snap-fit ​​portion includes a snap-fit ​​block, the snap-fit ​​block includes a connecting body and a snap-fit ​​body that are connected to each other, and the cross-sectional dimension of the snap-fit ​​body is larger than the cross-sectional dimension of the connecting body; the connecting body is connected to the proximal side of the second pull ring body, and the snap-fit ​​body is connected to the connecting body and the first pull ring body respectively.

11. A bendable sheath, characterized in that, It includes the pull ring assembly as described in any one of claims 1-8 or the first pull ring body as described in claim 9.

Images