Bending adjusting assembly and medical kit

Abstract

The bending adjusting assembly comprises a driving pipe and a follow-up pipe, the driving pipe comprises a first flexible part, a first ridge part of the first flexible part and a first bending part, the first bending part is provided with at least one first window which extends from one side of the first ridge part and stops at the other side of the first ridge part, and the follow-up pipe comprises a second flexible part, a second ridge part and a second bending part. The rigidity of the first bending part is reduced; the driving pipe is sleeved with the follow-up pipe, the follow-up pipe comprises a second flexible part, and the second flexible part comprises a second ridge part and a second bent part; the second bending part is provided with at least one second window which extends from one side of the second ridge part and stops at the other side of the first ridge part, so that the rigidity of the second bending part is reduced; the first flexible part and the second flexible part correspond to each other in the axial direction, and the first ridge part and the second ridge part are oppositely arranged in the circumferential direction. The connecting strength of the bending adjusting assembly can be improved, the bending adjusting assembly cannot be broken after the bending state of the far end of the bending adjusting assembly is repeatedly changed, and the anti-fatigue capacity can be improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a bending adjustment component and a medical kit. Background Technology

[0002] In interventional procedures, bending devices are precision manipulators used for catheters or other medical devices. Their primary purpose is to adjust the bending angle of the device to accommodate the different anatomy of each patient. Bending devices are particularly important in interventional treatments, especially in procedures requiring passage through blood vessels, lumens, or other narrow spaces, such as percutaneous coronary intervention (PCI), cerebrovascular interventions, and neurointerventions. Bending devices help surgeons precisely navigate devices, avoiding anatomical obstacles or complex pathways, improving treatment outcomes, and reducing surgical risks for patients.

[0003] Taking Transjugular Intrahepatic Portosystemic Shunt (TIPS) as an example, the basic principle of TIPS is to create an artificial channel within the liver to directly drain portal vein blood into the hepatic vein, thereby reducing portal vein pressure. Currently, during liver parenchyma puncture, a bending adjustment component is needed to precisely adjust the extension direction of the puncture component so that the puncture extends in the preset direction, thus passing through the liver parenchyma to reach the portal vein and form an artificial channel. However, existing bending adjustment components are prone to breakage after repeated bending, have insufficient connection strength, and poor fatigue resistance. In addition, once the distal end of the bending adjustment component is bent, it is difficult to return it to its initial straight state. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this utility model is to provide a bending adjustment component, comprising:

[0005] An active tube, the active tube including a first flexible portion, the first flexible portion including an axially extending first ridge and a first bend, the first bend having at least one first window extending from one side of the first ridge and ending at the other side of the first ridge, to reduce the rigidity of the first bend;

[0006] A follower tube is sleeved on the active tube. The follower tube includes a second flexible portion, which includes a second ridge and a second curved portion. The second curved portion has at least one second window extending from one side of the second ridge and ending at the other side of the first ridge to reduce the rigidity of the second curved portion.

[0007] The first flexible portion and the second flexible portion are axially aligned, and the first ridge and the second ridge are circumferentially opposite to each other.

[0008] Preferably, the active tube further includes a first head and a first tail in the axial direction, the first head and the first tail being respectively disposed at both ends of the first flexible portion.

[0009] Preferably, the follower tube includes an outer tube, a thickening layer, and a sleeve in the radial direction, wherein the thickening layer is located on the outer surface of the outer tube, and the sleeve is located on the outer surface of the thickening layer.

[0010] Preferably, the outer tube further includes a second head and a second tail along the axial direction, with the second head and the second tail respectively disposed at both ends of the second flexible portion.

[0011] Preferably, the first head has a first positioning hole on its circumferential surface, and the second head has a second positioning hole on its circumferential surface, with the first positioning hole and the second positioning hole corresponding to each other.

[0012] Preferably, it further includes a controller for controlling the bending of the active pipe, the controller comprising:

[0013] shell;

[0014] A screw, which is rotatably disposed within the housing and can rotate threadedly relative to the housing, and the proximal end of the drive tube is connected to the screw;

[0015] An actuating wheel, sleeved on the screw, is used to drive the screw to rotate when operated, thereby controlling the distal end of the active tube to switch between a bent state and a straight state.

[0016] Preferably, the controller further includes:

[0017] A fixing block is sleeved on the proximal end of the follower tube to support the follower tube;

[0018] A limiting ring is sleeved on the proximal end of the active tube and spaced apart from the fixing block, and the limiting ring is located between the active tube and the screw to limit and fix the active tube and the screw.

[0019] Preferably, the screw surface is provided with a groove that extends along the axial direction of the screw, and the housing has a limiting strip corresponding to the groove to restrict the rotation of the screw.

[0020] Preferably, a sealing element is provided between the fixing block and the limiting ring, with one end of the sealing element sleeved on the active tube and the other end sleeved on the follower tube.

[0021] Another object of this invention is to provide a medical kit comprising: a bending assembly as described above and an actuation assembly passing through the active tube in the bending assembly.

[0022] The above-described solution of this utility model has at least the following beneficial effects:

[0023] The bending assembly provided by this utility model can increase the connection strength between the first flexible part and the rest of the active tube, and between the second flexible part and the rest of the follower tube in the bending assembly. It can repeatedly change the bending state of the far end of the bending assembly without breaking, and the fatigue resistance of the active tube and the follower tube can also be improved.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the bending adjustment component provided in the embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the active tube provided in the embodiment of this utility model;

[0028] Figure 3a This is a schematic diagram of the structure of the follower tube provided in the embodiment of this utility model;

[0029] Figure 3b yes Figure 3a The diagram shows a cross-sectional view of the follower tube at point AA.

[0030] Figure 4 This is a schematic diagram of the structure of the outer tube provided in the embodiment of this utility model;

[0031] Figure 5a This is an example diagram of the unfolded first flexible part provided in the embodiment of this utility model;

[0032] Figure 5b This is another unfolded example diagram of the first flexible part provided in this embodiment of the present invention;

[0033] Figure 5cThis is another unfolded example diagram of the first flexible part provided in the embodiments of this utility model;

[0034] Figure 6a This is an example diagram of the unfolded second flexible part provided in the embodiment of this utility model;

[0035] Figure 6b This is another unfolded example diagram of the second flexible part provided in this embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the controller provided in the embodiment of this utility model;

[0037] Figure 8 This is an exploded view of the controller provided in the embodiments of this utility model;

[0038] Figure 9 This is a schematic diagram of the screw provided in the embodiment of this utility model;

[0039] Figure 10 This is an exploded view of the near end of the bending assembly provided in this embodiment of the present invention;

[0040] Figure 11 This is a schematic diagram of the assembly of a portion of the controller (including the actuation wheel) with the active tube and the follower tube provided in this embodiment of the utility model.

[0041] Figure 12 yes Figure 11 The diagram shows a partial structure of the controller (excluding the actuation wheel) and the assembly of the drive tube and follower tube.

[0042] Figure 13 yes Figure 11 The diagram shows a partial structure of the controller (excluding the actuating wheel and screw) and an assembly diagram of the drive tube and follower tube.

[0043] Figure 14 This is a cross-sectional schematic diagram of the first flexible part provided in an embodiment of this utility model.

[0044] Explanation of icon numbers:

[0045] 111, Active tube; 1111, First head; 1112, First flexible part; 1113, First tail; 112, Follower tube; 1121, Outer tube; 11211, Second head; 11212, Second flexible part; 11213, Second tail; 1122, Thickened layer; 1123, Tube sleeve; 113, Controller; 1131, Outer shell; 1131a, Upper outer shell; 1131b, Lower outer shell; 1132, Screw; 1132a, Circumferential limiting groove; 1133, Fixing block; 1134, Limiting ring; 1135, Actuating wheel; 114, Seal; H1, First positioning hole; H2, Second positioning hole; H3, Connecting hole; P1, First ridge; P2, First bend; W1, First window; P3, Second ridge; P4, Second bend; W2, Second window.

[0046] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 utility model according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In this utility model, unless otherwise explicitly specified and limited, "proximal end" or "proximal side" refers to the end that is relatively far from the patient and close to the operator; "distal end" or "distal side" refers to the end that is relatively close to the patient and far from the operator.

[0053] The bending adjustment component in the embodiments of this utility model will now be described explanatoryly with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below in conjunction with the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0054] Reference Figure 1As shown in Figure 3, this embodiment of the present invention provides a bending assembly, including: an active tube 111 and a follower tube 112. The active tube 111 includes a first flexible portion 1112 located at the distal end of the active tube 111 and which is bendable. The first flexible portion 1112 includes a first ridge P1 and a first curved portion P2 arranged circumferentially. The first curved portion P2 is provided with at least one first window W1 extending from one side of the first ridge P1 and ending at the other side of the first ridge P1 to reduce the rigidity of the first curved portion P2. The follower tube 112 is sleeved on the active tube 111. On 11, the follower tube 112 includes a second flexible portion 11212 located at the distal end of the follower tube 112 and is bendable. The second flexible portion 11212 includes a second ridge P3 and a second curved portion P4 arranged in a circumferential direction. The second curved portion P4 is provided with at least one second window W2 extending from one side of the second ridge P3 and ending at the other side of the first ridge P1 to reduce the rigidity of the second curved portion P4. The first flexible portion 1112 and the second flexible portion 11212 are axially corresponding, and the first ridge P1 and the second ridge P3 are arranged circumferentially opposite to each other.

[0055] In the bending assembly provided in this embodiment, the active tube 111 is used to change the state of the first flexible part 1112 under the action of external force, thereby changing the extension direction of the actuator passing through the active tube 111; the follower tube 112 is used to support the active tube 111. In this embodiment, by arranging the first ridge P1 on the opposite side of the second ridge P3, compared with the conventional bending assembly, the connection strength between the first flexible part 1112 and the rest of the active tube 111, and between the second flexible part 11212 and the rest of the follower tube 112, can be increased. This allows the bending assembly to repeatedly change its distal bending state without breaking, and also improves the fatigue resistance of the active tube 111 and the follower tube 112. In this embodiment, "change of state" can be a switch between a bent state and a straight state, or a change in the bent state, such as changing from a first bending angle to a second bending angle.

[0056] In this embodiment, the first ridge P1 and the first curved portion P2 with the first window W1 in the first flexible portion 1112 form a structure similar to a sodium hypocarbon tube to improve the bending performance of the first flexible portion 1112. Figure 14As shown, the first ridge P1 and the first curved portion P2 in the first flexible portion 1112 are arranged circumferentially. The circumferential length of the first ridge P1 is 1 / 12 to 1 / 3 of the circumferential length of the first flexible portion 1112. The first window W1 can be laser-engraved on the first curved portion P2. In one example, the circumferential length of the first window W1 can occupy 1 / 2 to 9 / 10 of the circumference of the first flexible portion 1112. In one example, there are multiple first windows W1, and the spacing between the first windows W1 at both ends along the axial direction of the first flexible portion 1112 is 1 / 2 to 1 / 3 of the axial length of the first flexible portion 1112. In one example, there can be multiple first windows W1, and the circumferential length of the multiple first windows W1 can vary with the position along the axial direction of the first flexible portion 1112. For example, the circumferential length of the first windows W1 located at both ends along the axial direction is smaller than the circumferential length of the first windows W1 located in the middle portion. In another example, the circumferential length of the first windows W1 remains unchanged. In one example, all the first windows W1 are equally spaced. In another example, some of the first windows W1 are equally spaced. This embodiment does not impose any particular limitation on the shape of the first windows W1. In one example, the first window W1 is a slit, and the shape of the slit can be rectangular, rhomboid, elliptical, oval, or crescent-shaped, or a combination thereof. For example, Figures 5a to 5c These are schematic diagrams showing the first flexible part 1112 unfolding along the first ridge P1, wherein... Figure 5a The slit shown is rectangular. Figure 5b The slit shown is a combination of rectangle and oval. Figure 5c The slits shown are a combination of rectangles and crescent shapes. In one example, the first windows W1 are configured in groups. The first windows W1 in each group can be configured according to the length and shape described above. For example, as... Figure 5b As shown, each group includes one oval-shaped slit, four first rectangular slits, and a pair of second rectangular slits between every two first rectangular slits and between the first rectangular slits and the oval-shaped slits. The second rectangular slits are located at both ends of the first rectangular slits, that is, closer to the first ridge P1 than the first rectangular slits. Each group is repeated at equal intervals. Thus, the first flexible part 1112 can only swing within the plane defined by the first ridge P1 and the axis of the first flexible part 1112. When the active tube 111 needs to be in a bent state, the first ridge P1 can be positioned on the outer side of the circumference. In this way, during the insertion of the actuator, the actuator can slide along the first ridge P1, preventing the actuator from getting stuck in the first window W1 and thus causing damage to the actuator.

[0057] Similarly, in this embodiment, the second flexible portion 11212, like the first flexible portion 1112, uses a second ridge P3 and a second curved portion P4 with a second window W2 to form a structure similar to a sodium hypocarbon tube, thereby improving the bending performance of the second flexible portion 11212. Similar to the first flexible portion 1112, the second ridge P3 and the second curved portion P4 in the second flexible portion 11212 are arranged circumferentially. The circumferential length of the second ridge P3 is 1 / 12 to 1 / 3 of the circumferential length of the second flexible portion 11212. The second window W2 can be laser-engraved on the second curved portion P4. The size, shape, etc., of the second window W2 are similar to those of the first window W1, and will not be described again here. For example, the circumferential length of the second window W2 along the circumference of the outer tube 1121 is 1 / 2 to 9 / 10 of the circumference of the second flexible portion 11212. For example, there are multiple second windows W2, and these multiple second windows W2 are arranged along the axial direction. The spacing between the second windows W2 located at both ends of the axial direction along the axial direction of the second flexible part 11212 is 1 / 2 to 1 / 2 of the axial length of the second flexible part 11212. As an example, Figure 6a This is a schematic diagram showing the second flexible section 11212 unfolding along the second ridge P3. (See diagram below.) Figure 6a As shown, the second window W2 is a slit, the slit is rectangular, and multiple slits are arranged at intervals along the axial direction, with the circumferential length of the slits at both ends of the axial direction being smaller than the circumferential length of the slit in the middle. (Example) Figure 6b This is a schematic diagram showing the second flexible section 11212 unfolding along the second ridge P2. (See diagram below.) Figure 6b As shown, the second window W2 is a slit, and multiple slits in the shape of a third rectangle are arranged at axial intervals. Between every two slits in the shape of a third rectangle, there is also a pair of slits in the shape of a fourth rectangle. The slits in the shape of a fourth rectangle are located at the circumferential ends of the slits in the shape of a third rectangle, and their axial projections from the second flexible part 11212 partially overlap. The circumferential length of each slit in the shape of a fourth rectangle located at the axial ends is less than the circumferential length of each slit in the shape of a fourth rectangle located in the middle. Thus, the second flexible part 11212 is restricted to swinging within the plane defined by the axes of the second ridge P3 and the second flexible part 11212. Furthermore, the maximum bendable angle of the second flexible part 11212 is greater than or equal to the maximum bendable angle of the first flexible part 1112 to prevent the follower tube 112 from obstructing the bending of the active tube 111.

[0058] Reference Figure 2As shown, the active tube 111 further includes a first head 1111 and a first tail 1113 along the axial direction. The first head 1111 and the first tail 1113 are respectively located at the distal and proximal ends of the first flexible portion 1112. The first head 1111 is used to fix with the outer tube 1121 described below, realizing distal-end fixation between the active tube 111 and the follower tube 112. This embodiment does not have any particular limitation on the specific fixing method, such as using laser welding or bio-adhesive bonding. The first tail 1113 is used to transmit external force to the first flexible portion 1112, causing the state of the first flexible portion 1112 to change. That is, the first flexible portion 1112 can switch between a bent state and a straight state, and the bending state of the first flexible portion 1112 can also be changed, for example, changing the first flexible portion 1112 from a first bending angle to a second bending angle, so that it can be flexibly adjusted for different application scenarios. In one example, the active tube 111 is integrally formed. Preferably, the integrally formed active tube 111 is made of stainless steel. In another example, the main pipe 111 is composed of multiple pipes. Preferably, the multiple pipes are made of either stainless steel or nickel-titanium alloy.

[0059] Reference Figure 3a and Figure 3b As shown, the follower tube 112 includes an outer tube 1121, a thickening layer 1122, and a sleeve 1123 in the radial direction. The second flexible portion 11212 is located at the distal end of the outer tube 1121. The thickening layer 1122 covers the outer surface of the second flexible portion 11212 and is used to locally increase the outer diameter of the follower tube 112. This allows for a tighter fit between the inner lumen of the guide tube, such as the guide sheath, through which the bending assembly is inserted, and the thickening layer 1122 without increasing the overall outer diameter of the follower tube 112. Consequently, when the bending assembly is inserted through the guide tube, the pushing resistance is minimized while ensuring a tight fit, and tissue abrasion is reduced. The sleeve 1123 is located on the outer surface of the thickening layer 1122 and is used to reduce the surface friction of the bending assembly.

[0060] In this embodiment, the axial length of the thickening layer 1122 can be 1mm-10mm longer than the second flexible part 11212. The thickening layer 1122 can be formed by winding a thin film, or by heat shrinking or reflowing a thin polymer tube. For example, the thickening layer 1122 can be formed by heat shrinking a 0.01mm thick ePTFE film (i.e., Expanded Polytetrafluoroethylene) or a thin PET heat-shrinkable tube (i.e., Polyethylene Terephthalate).

[0061] In this embodiment, the sleeve 1123 is located outside the follower tube 112 and can extend from the proximal end of the outer tube 1121 to the distal end of the outer tube 1121. The sleeve 1123 can be formed by directly heat-shrinking heat-shrink tubing or by heat reflow. Furthermore, the proximal end of the outer tube 1121 extends slightly beyond the sleeve 1123 to facilitate the outer tube 1121's mating with other components. Furthermore, since the first head 1111 is typically made of metal, a portion of the first head 1111 can be covered by the distal end of the sleeve 1123, thereby preventing damage caused by the first head 1111 directly contacting tissue.

[0062] Reference Figure 4 As shown, the outer tube 1121 is sleeved on the outside of the active tube 111, and both ends of the active tube 111 extend from both ends of the outer tube 1121. In this embodiment, there is no particular limitation on the length of the extension at both ends. For example, the distal end of the active tube 111 can extend to a length of 1-2 mm. The outer tube 1121 also includes a second head 11211 and a second tail 11213 along the axial direction, with the second head 11211 and the second tail 11213 respectively located at the distal and proximal ends of the second flexible part 11212. The second head 11211 is used to fix with the first head 1111, achieving fixation between the active tube 111 and the follower tube 112. The second tail 11213 serves a supporting function. In one example, the outer tube 1121 is integrally formed. Preferably, the integrally formed outer tube 1121 is made of stainless steel. In another example, the outer tube 1121 is composed of multiple tubes. Preferably, the multiple tubes are made of stainless steel or nickel-titanium alloy.

[0063] Reference Figure 2 and Figure 4 As shown, a first positioning hole H1 is provided on the circumferential surface of the first head 1111, and a second positioning hole H2 is provided on the circumferential surface of the second head 11211. When the first positioning hole H1 and the second positioning hole H2 are configured to be aligned with each other, the first flexible part 1112 and the second flexible part 11212 correspond in axial position, and the first ridge P1 and the second ridge P3 are arranged opposite each other in the circumferential direction. In this way, the bending directions of the first flexible part 1112 and the second flexible part 11212 are matched, and the outer tube 1121 provides support to the active tube 111 without restricting the bending of the active tube 111.

[0064] In this embodiment, the first positioning hole H1 may include at least one, and the second positioning hole H2 may also include at least one. The diameter of the first positioning hole H1 and the second positioning hole H2 may be 0.5mm to 1.0mm. For example, the diameter of both the first positioning hole H1 and the second positioning hole H2 is 0.6mm. When there are multiple first positioning holes H1 and multiple second positioning holes H2, the first positioning holes H1 and multiple second positioning holes H2 are configured such that when the multiple first positioning holes H1 and multiple second positioning holes H2 are aligned one-to-one, the active tube 111 and the follower tube 112 have a unique relative positional relationship. This avoids the situation where, when the multiple first positioning holes H1 and multiple second positioning holes H2 are aligned one-to-one, the first ridge P1 and the second ridge P3 are not axially aligned or not circumferentially aligned.

[0065] Exemplarily, there is one first positioning hole H1 and one second positioning hole H2. The first positioning hole H1 is located at the first head 1111 and is circumferentially located on one side of the first ridge P1. The second positioning hole H2 is located at the second head 11211 and is circumferentially located on the opposite side of the second ridge P3. Thus, when the first positioning hole H1 corresponds to the second positioning hole H2, the first flexible part 1112 and the second flexible part 11212 correspond in axial position, and the first ridge P1 and the second ridge P3 are distributed at a circumferential interval of 180°.

[0066] Exemplarily, there are two first positioning holes H1 and two second positioning holes H2. The included angle between the two first positioning holes H1 in the circumferential direction is equal to the included angle between the two second positioning holes H2 in the circumferential direction, and neither angle is equal to 180°. That is, the two first positioning holes H1 are not evenly distributed in the circumferential direction, and the two second positioning holes H2 are not evenly distributed in the circumferential direction. Furthermore, the axial distance between the first positioning holes H1 and the axial distance between the second positioning holes H2 are equal. At this time, when the first positioning holes H1 and the second positioning holes H2 are aligned one by one, the outer tube 1121 and the active tube 111 can be accurately positioned in the circumferential direction, realizing the axial positional correspondence between the first flexible part 1112 and the second flexible part 11212, and the first ridge P1 and the second ridge P3 are distributed at 180° intervals in the circumferential direction. The accuracy is higher when connecting the active tube 111 and the outer tube 1121.

[0067] As an optional embodiment, the second head 11211 is further provided with connecting holes H3, including at least two holes distributed along the circumferential direction. The connecting holes H3 are used to fix the first head 1111 and the second head 11211 together, for example, by laser welding and / or adhesive bonding. Simultaneously, the connecting holes H3 also contribute to the axial bonding strength between the sleeve 1123 and the outer tube 1121. This embodiment does not have a particular limitation on the shape of the connecting holes H3; they can be round, square, elliptical, or irregularly shaped. Preferably, the connecting holes H3 are round, for example, round holes with a diameter of 1mm to 3mm.

[0068] Reference Figures 7 to 13 As shown, the bending assembly also includes a controller 113 for controlling the change of state of the first flexible part 1112. The controller 113 includes: a housing 1131, a screw 1132, and an actuating wheel 1135. The actuating wheel 1135 is rotatable relative to the housing 1131 and is at least partially housed in the housing 1131. The screw 1132 is movably disposed within the housing 1131 and is threadedly connected to the actuating wheel 1135 and fixedly connected to the proximal end of the active tube 111. The housing 1131 is fixedly connected to the outer tube 1121. When the actuating wheel 1135 is rotated, it drives the screw 1132 to move axially, thereby causing the proximal end of the active tube 111 to move and change the state of the first flexible portion 1112 of the active tube 111. This allows the first flexible portion 1112 to switch between a bent and straight state, and also changes its bending state, for example, from a first bending angle to a second bending angle, enabling flexible adjustment for different application scenarios. In this embodiment, by redundantly setting the stroke end point of the screw 1132, the actuating wheel 1135 can drive the screw 1132 in the reverse direction, thereby causing the first flexible portion 1112 to bend in the reverse direction, ensuring that the first flexible portion 1112 remains straight even after bending fatigue.

[0069] Specifically, the actuating wheel 1135 may include a receiving portion located at the distal end and a handle located at the proximal end. The receiving portion is located within the housing 1131 and has internal threads. A screw 1132 is partially received within the receiving portion and has external threads that are threadedly connected to the actuating wheel 1135. The handle is located on the outer side of the proximal end of the housing 1131. Preferably, the handle has anti-slip texture. Further, the actuating wheel 1135 also includes a limiting portion provided within the housing 1131, which prevents axial movement of the actuating wheel 1135, so that when an external force is applied, the actuating wheel 1135 can only rotate relative to the housing 1131 and cannot move axially relative to the housing 1131. Exemplarily, the receiving portion may be cylindrical, and the limiting portion may be an annular axial limiting protrusion fixedly fitted onto the receiving portion. Correspondingly, the housing 1131 has a circumferentially arranged axial limiting groove, in which the annular protrusion is rotatably received. The sidewall of the axial limiting groove prevents the annular protrusion from moving axially. In this way, the limiting part can limit the axial movement of the actuator wheel 1135. For example, the limiting part can be a limiting groove circumferentially provided in the receiving part, with an opening at the proximal end of the housing 1131, and a shoulder formed between the opening and the housing wall. By receiving the shoulder in the limiting groove, the actuator wheel 1135 is prevented from moving axially relative to the housing 1131.

[0070] Reference Figures 9 to 12 As shown, the screw 1132 has a circumferential limiting groove 1132a on its surface, which extends along the axial direction of the screw 1132. The housing 1131 has a circumferential limiting strip corresponding to the circumferential limiting groove 1132a. The circumferential limiting strip extends inward and is accommodated within the circumferential limiting groove 1132a to restrict the rotation of the screw 1132. For ease of disassembly and assembly, the housing 1131 may include an upper housing 1131a and a lower housing 1131b. Each of the upper housing 1131a and the lower housing 1131b has a circumferential limiting strip. Correspondingly, there are two circumferential limiting grooves 1132a, arranged symmetrically. Thus, through the cooperation of the circumferential limiting grooves 1132a and the circumferential limiting strips, the screw 1132 cooperates with the upper housing 1131a and the lower housing 1131b respectively to form a sliding pair, thereby restricting the rotation of the screw 1132. The screw 1132 is sleeved and fixed to the proximal end of the active tube 111, i.e., the first tail 1113. For example, it can be fixed by means of adhesive bonding.

[0071] In this embodiment, the controller 113 further includes a fixing block 1133 for fixing the follower tube 112 to the outer shell 1131. Specifically, the fixing block 1133 is fixedly connected to the proximal end of the follower tube 112, for example, by welding and / or bonding. More specifically, the fixing block 1133 is sleeved and fixed to the proximal end of the outer tube 1121, i.e., the outer surface of the second tail portion 11213. Meanwhile, the upper outer shell 1131a and the lower outer shell 1131b are respectively provided with receiving grooves, which can respectively receive and fit the two sides of the fixing block 1133, thereby fixing the outer tube 1121 to the outer shell 1131.

[0072] Furthermore, the controller 113 also includes a limiting ring 1134. The limiting ring 1134 is disposed between the drive tube 111 and the screw 1132 to limit and fix the drive tube 111 and the screw 1132. Specifically, the limiting ring 1134 is located near the end of the fixing block 1133 and is fixedly sleeved on the near end of the drive tube 111, for example, by welding and / or bonding. The limiting ring 1134 is fixedly connected to the screw 1132. For example, the limiting ring 1134 is located outside the screw 1132. Alternatively, the screw 1132 may have a cavity, and the limiting ring 1134 may be partially or entirely located within the cavity of the screw 1132. Thus, the screw 1132 and the active tube 111 are relatively fixed by the limiting ring 1134, and the force on the actuating wheel 1135 is transmitted to the far end of the active tube 111 through the screw 1132. Since the first head 1111 and the second head 11211 are fixedly connected, and the first flexible part 1112 adopts a structure similar to hyaluronic acid, when the force on the actuating wheel 1135 is transmitted to the far end of the active tube 111, the first flexible part 1112 can bend under the action of bending moment, thereby driving the second flexible part 11212 on the follower tube 112 to bend, so as to complete the bending operation of the bending assembly.

[0073] Furthermore, a sealing element 114 is provided between the fixing block 1133 and the limiting ring 1134. One end of the sealing element 114 is sleeved on the active tube 111, and the other end is sleeved on the follower tube 112. The sealing element 114 is tubular and is used to seal the gap between the outer tube 1121 of the active tube 111 and the follower tube 112 to prevent blood leakage. Preferably, the sealing element 114 also has a certain degree of elasticity, capable of withstanding a small axial displacement between the active tube 111 and the outer tube 1121, such as an axial displacement of 0.5 to 3 mm between them.

[0074] Another embodiment of this utility model provides a medical kit, including: the bending assembly as described above and an execution assembly passing through the active tube 111 in the bending assembly. By using the bending assembly for guidance, the connection strength between the first flexible portion 1112 and the remaining portion of the active tube 111, and between the second flexible portion 11212 and the remaining portion of the follower tube 112 in the bending assembly can be increased. This allows the bending assembly to withstand repeated changes in its distal bending state without breakage, and also improves the fatigue resistance of the active tube 111 and the follower tube 112. This embodiment does not have any particular limitation on the type of execution assembly. The execution assembly can be, for example, a puncture assembly for transseptal puncture, a TIPS procedure for puncturing liver parenchyma, or a delivery assembly for delivering valve clips in valve repair surgery.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A bending adjustment component, characterized in that, include: An active tube includes a first flexible portion located at the distal end of the active tube and which is bendable. The first flexible portion includes a first ridge and a first bend that are arranged circumferentially. The first bend has at least one first window that extends from one side of the first ridge and terminates on the other side of the first ridge to reduce the rigidity of the first bend. A follower tube is sleeved on the active tube. The follower tube includes a second flexible portion located at the distal end of the follower tube and is bendable. The second flexible portion includes a second ridge and a second curved portion arranged circumferentially. The second curved portion has at least one second window extending from one side of the second ridge and ending at the other side of the first ridge to reduce the rigidity of the second curved portion. The first flexible portion and the second flexible portion are axially aligned, and the first ridge and the second ridge are circumferentially opposite to each other.

2. The bending adjustment assembly according to claim 1, characterized in that, The circumferential length of the first ridge is 1 / 12 to 1 / 3 of the circumferential length of the first flexible part; the circumferential length of the second ridge is 1 / 12 to 1 / 3 of the circumferential length of the second flexible part; the circumferential length of the first window is 1 / 2 to 9 / 10 of the circumferential length of the first flexible part; the circumferential length of the second window is 1 / 2 to 9 / 10 of the circumferential length of the second flexible part.

3. The bending adjustment component according to claim 1, characterized in that, The maximum bending angle of the second flexible part is greater than or equal to the maximum bending angle of the first flexible part.

4. The bending adjustment assembly according to claim 1, characterized in that, The active tube further includes a first head and a first tail along the axial direction, the first head being located at the distal end of the first flexible portion and the first tail being located at the proximal end of the first flexible portion.

5. The bending adjustment assembly according to claim 4, characterized in that, The follower tube includes an outer tube, a thickening layer, and a sleeve in the radial direction. The thickening layer covers the outer surface of the second flexible part, the sleeve is located on the outer surface of the thickening layer, and the active tube extends from both ends of the outer tube.

6. The bending adjustment assembly according to claim 5, characterized in that, The outer tube also includes a second head and a second tail along the axial direction, the second head being located at the distal end of the second flexible part and the second tail being located at the proximal end of the second flexible part.

7. The bending adjustment assembly according to claim 6, characterized in that, The first head has a first positioning hole on its circumferential surface, and the second head has a second positioning hole on its circumferential surface. The first positioning hole and the second positioning hole are configured such that when the first positioning hole and the second positioning hole are aligned with each other, the first flexible part and the second flexible part correspond in axial position, and the first ridge and the second ridge are arranged opposite each other in the circumferential direction.

8. The bending adjustment assembly according to claim 5, characterized in that, It also includes a controller for controlling the change of state of the first flexible part, the controller comprising: a housing, a screw, and an actuating wheel; the actuating wheel is rotatable relative to the housing and is at least partially housed in the housing; the screw is movably disposed within the housing and threadedly connected to the actuating wheel, and fixedly connected to the proximal end of the active tube; the housing is fixedly connected to the outer tube; when the actuating wheel is operated to rotate, the actuating wheel drives the screw to move axially, thereby driving the proximal end of the active tube to move to change the state of the first flexible part.

9. The bending adjustment assembly according to claim 8, characterized in that, The controller also includes: A fixing block is fixedly sleeved on the proximal end of the follower tube and embedded in the outer shell to fix the follower tube to the outer shell; A limiting ring is located near the fixed block and is fixedly sleeved on the near end of the active tube. The limiting ring and the screw are fixedly connected to limit and fix the active tube and the screw. A sealing element is located between the fixed block and the limiting ring, with one end of the sealing element sleeved on the active tube and the other end sleeved on the follower tube.

10. A medical kit, characterized in that, include: The bending assembly as described in any one of claims 1 to 9 and the actuation assembly passing through the active tube in the bending assembly.

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