Clamp release structure and delivery system

Abstract

This application relates to the field of medical devices and discloses a clamping and releasing structure and a delivery system. The clamping and releasing structure includes a base, a second clamping member, and a wire. The base includes a connecting seat and a first clamping member connected together, the first clamping member having a first clamping surface. The second clamping member includes a clamping portion and a connecting portion connected together, the clamping portion having a second clamping surface, the second clamping surface and the first clamping surface being able to jointly clamp the proximal side of the branch stent. The distal end of the wire is connected to the clamping portion, and the proximal end of the wire is positioned at the distal end of the delivery system. The clamping and releasing structure of this application can accurately release the branch stent to the lesion area and ensure its morphology after implantation is determined.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more particularly to a clamping release structure and delivery system. Background Technology

[0002] To treat lesions with branching vessels, a branch stent can be implanted at the lesion site. By closely attaching the branch stent to the inner wall of the blood vessel, the lesion is isolated from blood flow, thus achieving treatment. Furthermore, embedded stents are implanted in the two channels of the branch stent to allow the aorta to connect with the two branch arteries, ensuring smooth blood flow to the branch vessels.

[0003] However, after the branch stent is released, the proximal end of the branch stent located between the two channels may shift, which cannot ensure that the two channels of the branch stent can be positioned opposite the two branch arteries respectively. This affects the implantation channel of the embedded stent, thereby affecting the treatment effect of the surgery and posing a safety risk to the patient. Summary of the Invention

[0004] The purpose of this application is to provide a clamping release structure and delivery system designed to ensure the positioning of the distal ends between branches, thereby improving the safety of the procedure.

[0005] To achieve the above objectives, this application provides a clamping release structure applied to a conveyor for conveying branch supports, comprising:

[0006] The base includes a connecting seat and a first clamping member connected to each other. The first clamping member is connected to the distal end of the connecting seat, and the first clamping member has a first clamping surface on one side in the radial direction.

[0007] The second clamping member includes a clamping part and a connecting part connected to each other. The connecting part is elastic. The proximal end of the connecting part is connected to the base, and the distal end of the connecting part is connected to the clamping part. The clamping part and the first clamping member are arranged side by side in a radial direction. The clamping part is provided with a second clamping surface. The second clamping surface and the first clamping surface can jointly clamp the proximal side of the branch bracket.

[0008] The wire is drawn, with its distal end connected to the clamping part and its proximal end positioned at the distal end of the conveyor.

[0009] In one embodiment, the connecting portion is inclined away from the clamping portion along the direction from the distal end to the proximal end.

[0010] In one embodiment, the connecting portion surrounds a portion of the first clamping member, and the proximal end of the connecting portion is connected to the connecting seat.

[0011] In one embodiment, the proximal side of the clamping portion is provided with a first surface adjacent to the second clamping surface, and the first surface is inclined towards the proximal end in a direction away from the first clamping member.

[0012] In one embodiment, the distal end of the clamping portion is provided with a second surface, which is inclined toward the proximal end in a direction away from the first clamping member.

[0013] In one embodiment, it further includes an elastic element disposed between the clamping portion and the connecting seat; and / or, the elastic element surrounds the wire drawing.

[0014] In one embodiment, the base has a communicating hole that passes through the first clamping member and the connecting seat. The communicating hole is located at the axial center of the connecting seat and at an off-center position from the axial center of the first clamping member. The communicating hole is used for the conveyor sheath core to pass through.

[0015] In one embodiment, an adapter structure is further provided between the first clamping surface and the second clamping surface. The adapter structure includes a protrusion and a groove. The protrusion is adapted to and can be placed in the groove. The protrusion is formed on one of the first clamping surface and the second clamping surface, and the groove is formed on the other of the first clamping surface and the second clamping surface. The protrusion is used to pass through the proximal end of the branch bracket.

[0016] A conveying system includes a conveyor, the conveyor comprising a sheath core, a push rod, a sheath tube, a handle, and the clamping and releasing structure;

[0017] The proximal end of the push rod is connected to the handle, the distal end of the push rod is connected to the connecting seat, the sheath core passes through the push rod and the clamping release structure, the sheath tube is sleeved on the outside of the push rod and the clamping release structure, the handle is used to control the sheath tube to move axially relative to the push rod, and at least part of the proximal end of the wire drawing can be exposed outside the handle.

[0018] In one embodiment, the system further includes a branch support, which includes a main body segment and a proximal segment connected together. The proximal segment includes two radially parallel channels, and the proximal side of the proximal segment includes a connecting end located between the two channels. The first clamping surface and the second clamping surface are capable of clamping the connecting end. The arrangement direction of the two channels is the same as the arrangement direction of the first clamping member and the second clamping member.

[0019] The clamping-release structure and delivery system provided in this application, when a branch stent is implanted into the lesion site via a delivery device, uses the first clamping surface of the first clamping member and the second clamping surface of the second clamping member to clamp and fix the proximal end of the branch stent, thereby determining the position of the proximal end of the branch stent. For example, the proximal end of the branch stent can be positioned at the bifurcation of a branch artery. After the branch stent reaches the designated lesion site, by pulling the distal end of the pull wire, the clamping part, under the connecting action of the connecting part, will swing away from the first clamping surface, separating the first clamping surface and the second clamping surface to release the proximal end of the branch stent. This allows the branch stent to be accurately released into the lesion area and ensures that its post-implantation morphology is determined. Therefore, the clamping-release structure of this application can facilitate surgical treatment and avoid potential safety hazards during surgery. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of the clamping release structure provided in the embodiments of this application;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a second schematic diagram of the clamping release structure provided in the embodiments of this application;

[0024] Figure 4 This is a schematic internal cross-sectional view of the clamping and releasing structure provided in the embodiments of this application;

[0025] Figure 5 This is the third schematic diagram of the clamping and releasing structure provided in the embodiments of this application;

[0026] Figure 6 This is the fourth schematic diagram of the clamping release structure provided in the embodiments of this application;

[0027] Figure 7 This is the fifth schematic diagram of the clamping release structure provided in the embodiments of this application;

[0028] Figure 8 This is a schematic diagram illustrating the clamping and releasing steps of the clamping and releasing structure provided in this application embodiment;

[0029] Figure 9This is a schematic diagram of the structure of the conveyor provided in the embodiment of this application;

[0030] Figure 10 This is one of the connection diagrams of the clamping release structure provided in the embodiments of this application;

[0031] Figure 11 This is the second connection diagram of the clamping release structure provided in the embodiments of this application;

[0032] Figure 12 This is the third connection diagram of the clamping and releasing structure provided in the embodiments of this application;

[0033] Figure 13 This is a schematic diagram of the structure of the handle of the conveyor provided in the embodiment of this application;

[0034] Figure 14 This is a schematic diagram of the branch support structure provided in the embodiment of this application.

[0035] Explanation of icon numbers:

[0036] 100: Clamping release structure;

[0037] 10: Base; 10a: Connecting hole; 10b: First wire drawing channel;

[0038] 11: Connecting seat; 12: First clamping member; 121: First clamping surface; 13: Protruding post;

[0039] 20: Second clamping member; 21: Clamping part; 211: Second clamping surface; 212: Second surface; 213: First surface; 22: Connecting part;

[0040] 30: Stringing;

[0041] 40: Elastic component;

[0042] 90: Adaptive structure;

[0043] 200: Branch support; 201: Main body segment; 202: Proximal segment; 2022: Channel;

[0044] 300: Handle; 301: Locking structure;

[0045] 400: Push rod;

[0046] 500: Sheath;

[0047] 600: Sheath core. Detailed Implementation

[0048] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may 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 this application and to fully convey the scope of this application to those skilled in the art.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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".

[0053] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0054] like Figure 1 and Figure 14 As shown, the conveying system provided in this application embodiment includes a clamping release structure 100 applied to a conveyor for conveying a branch support 200. The clamping release structure 100 includes a base 10, a second clamping member 20, and a wire drawing member 30.

[0055] The base 10 includes a connecting seat 11 and a first clamping member 12 connected together. The connecting seat 11 and the first clamping member 12 are arranged sequentially from the proximal end to the distal end. The first clamping member 12 is connected to the distal end of the connecting seat 11, and a first clamping surface 121 is provided on one side of the first clamping member 12 in the radial direction. The second clamping member 20 includes a clamping part 21 and a connecting part 22 connected together. The connecting part 22 can be an elastic element, thereby enabling a certain amount of elastic deformation. The proximal end of the connecting part 22 is connected to the base 10, and the distal end of the connecting part 22 is connected to the clamping part 21. The clamping part 21 and the first clamping member 12 are arranged side by side. The clamping part 21 is provided with a second clamping surface 211, which elastically abuts against the first clamping surface 121. The second clamping surface 211 and the first clamping surface 121 are used to jointly clamp the proximal side of the branch bracket 200. The distal end of the drawing wire 30 is connected to the clamping part 21, and the proximal end of the drawing wire 30 is placed at the distal end of the conveyor.

[0056] Here, when the proximal end of the wire 30 is pulled, the clamping part 21 will be subjected to a pulling force towards the proximal end. Since the clamping part 21 is connected to the base 10 through the connecting part 22, the clamping part 21 will press against the proximal end of the connecting part 22, causing the connecting part 22 to undergo elastic bending deformation. The clamping part 21 will then swing around the connecting part 22 in a direction away from the first clamping surface 121, causing the first clamping surface 121 and the second clamping surface 211 to separate. The first clamping member 12 and the second clamping member 20 will be released, thereby releasing the proximal end of the branch stent 200 so that the branch stent 200 can be accurately placed at the lesion location and ensure that its post-implantation morphology is determined.

[0057] It is important to know that after the delivery device places the branch stent 200 at the lesion site, an embedded stent can be implanted in the channel 2022 of the branch stent 200 before the proximal end of the branch stent 200 is released. This allows for anchoring of the embedded stent and one of the branch vessels before the branch stent 200 is released. Alternatively, the embedded stent can be implanted in the channel 2022 of the branch stent 200 after the proximal end of the branch stent 200 has been released.

[0058] In this embodiment of the clamping and release structure 100, when the branch stent 200 is implanted into the lesion site via a delivery device, the first clamping surface 121 of the first clamping member 12 and the second clamping surface 211 of the second clamping member 20 clamp and fix the proximal end of the branch stent 200, thereby determining the position of the proximal end of the branch stent 200. For example, the proximal end of the branch stent 200 can be positioned at the bifurcation of a branch artery. After the branch stent 200 reaches the designated lesion site, by pulling the distal end of the pull wire 30, the clamping part 21, under the connecting action of the connecting part 22, swings away from the first clamping surface 121, separating the first clamping surface 121 and the second clamping surface 211 to release the proximal end of the branch stent 200. This allows the branch stent 200 to be accurately released into the lesion area and ensures that its post-implantation morphology is determined. Therefore, the clamping and release structure 100 of this application can facilitate surgical treatment and avoid potential safety hazards during surgery.

[0059] like Figure 14 As shown, in some embodiments, the branch support 200 includes a connected main body segment 201 and a proximal segment 202. The proximal segment 202 includes two radially parallel channels 2022. The proximal end of the proximal segment 202 includes a connecting end located between the two channels 2022. A first clamping surface 121 and a second clamping surface 211 clamp the connecting end. The arrangement direction of the two channels 2022 is the same as the arrangement direction of the first clamping member 12 and the second clamping member 20. In this embodiment, both channels 2022 are provided with bevels so that the proximal end of the proximal segment 202 presents a V-shaped tip, thereby facilitating clamping and release structure 100 to clamp it. Figure 9 As shown, in this embodiment, after the branch stent 200 is delivered to the lesion site via a delivery device, the main body segment 201 of the branch stent 200 can be anchored to the vessel wall of the main blood vessel, while the proximal segment 202 is placed at the lesion site to provide support and vascular repair functions. The two channels 2022 can each correspond to two branch vessels. By implanting an embedded stent within the channel 2022, the strength and stability of the branch stent 200 are further enhanced, while ensuring the connectivity between the main blood vessel and the branch vessels, allowing for smooth blood flow.

[0060] like Figure 1 and Figure 2 As shown, in some embodiments, the distal end of the drawn wire 30 passes through the clamping portion 21, and a spherical structure is welded to the distal end of the clamping portion 21 and fixed thereto. When the clamping portion 21 is pulled by the drawn wire 30, it can be ensured that the drawn wire 30 can stably pull the clamping portion 21, and it is not easy for the drawn wire 30 to separate from the clamping portion 21, thus affecting the release of the clamping release structure 100 to the proximal end of the branch bracket 200. Exemplarily, the drawn wire 30 includes, but is not limited to, a nickel-titanium wire.

[0061] like Figure 1 and Figure 3 As shown, in some embodiments, the connecting portion 22 is inclined away from the clamping portion 21 along the direction from the distal end to the proximal end. When the proximal end of the wire 30 is pulled, the clamping portion 21 is subjected to a pulling force towards the proximal end, which presses against the proximal end of the connecting portion 22. Because the connecting portion 22 is inclined, when the clamping portion 21 acts on the connecting portion 22, the connecting portion 22 can more easily undergo elastic deformation, so as to release the proximal end of the branch bracket 200. This facilitates the operator in releasing the branch bracket 200.

[0062] like Figure 1 and Figure 3 As shown, in some embodiments, the connecting portion 22 partially surrounds the first clamping member 12, and the proximal end of the connecting portion 22 is connected to the connecting seat 11. This ensures that the connecting portion 22 has a relatively long length, making it easier for the connecting portion 22 to undergo elastic deformation when the wire 30 is pulled. Furthermore, the connecting portion 22, with its larger width, ensures sufficient structural strength to prevent breakage and guarantee safety and reliability during the surgical procedure.

[0063] For example, the circumference of the projection of the second clamping member 20 along the axial direction coincides with the circumference of the connecting seat 11. In this way, the outer surface of the connecting shaft and the outer surface of the second clamping member 20 are consistent, which can facilitate the insertion of the clamping release structure 100 into the sheath 500 and simplify the preoperative operation.

[0064] For example, there is a gap between the connecting part 22 and the periphery of the first clamping member 12, so that when the wire 30 is pulled, the connecting part 22 can undergo elastic deformation as a whole, which can prevent its local deformation from being too large and breaking.

[0065] like Figure 5As shown, in some embodiments, the proximal side of the clamping portion 21 is provided with a first surface 213 adjacent to the second clamping surface 211. The first surface 213 is inclined proximally in a direction away from the first clamping member 12. After the first clamping member 12 and the second clamping member 20 separate and release the proximal end of the branch stent 200, the clamping release structure 100 moves in a direction away from the branch stent 200 so that the proximal end of the branch stent 200 disengages from the first clamping member 12 and the second clamping member 20. If the first surface 213 is a radially arranged plane or is inclined distally in a direction away from the first clamping member 12, when the proximal end of the branch stent 200 disengages, the portion between the first surface 213 and the second clamping surface 211 of the clamping portion 21 may hook onto the proximal end of the branch stent 200, which may tear the proximal end of the branch stent 200, causing leakage of the branch stent 200, or causing the already positioned branch stent 200 to shift, affecting the subsequent implantation of the embedded stent. In this embodiment, since the first surface 213 is inclined towards the proximal end in a direction away from the first clamping member 12, when the proximal end of the branch stent 200 is disengaged, the first surface 213 and the second clamping surface 211 are set at an obtuse angle, and the part between them will not hook the proximal end of the branch stent 200. At the same time, the inclined first surface 213 can also provide guidance for the proximal disengagement of the branch stent 200, so as to ensure that the clamping release structure 100 can be smoothly disengaged from the branch stent 200 and ensure that the branch stent 200 is stably placed at the lesion position.

[0066] For example, the first surface 213 is a concave arc-shaped surface. When the clamping part 21 swings away from the first clamping surface 121, the clamping part 21 will tilt relative to the first clamping surface 121. At this time, the first surface 213 can tilt towards the first clamping surface 121. By setting the first surface 213 to a concave arc-shaped surface, it is ensured that there is a sufficient gap between the first clamping surface 121 and the clamping part 21 when the clamping part 21 swings, avoiding contact between other surfaces and the first clamping surface 121 when the clamping part 21 swings. For example, it can prevent the first surface 213 from contacting the first clamping surface 121. This ensures that the proximal end of the branch bracket 200 can smoothly disengage from the clamping release structure 100.

[0067] Of course, in other embodiments, the first clamping surface 121 of the clamping portion 21 extends proximally. When the first clamping surface 121 and the second clamping surface 211 clamp the proximal end of the branch stent 200, the proximal end of the branch stent 200 is entirely placed between the first clamping surface 121 and the second clamping surface 211 without crossing the first clamping surface 121. In this way, the clamping portion 21 does not need to have an inclined first surface 213. For example, the first clamping surface 121 of the clamping portion 21 can extend to the connecting portion 22. When the proximal end of the branch stent 200 is disengaged from the clamping release structure 100, since the proximal end of the branch stent 200 is entirely placed between the first clamping surface 121 and the second clamping surface 211, the first clamping surface 121 and the second clamping surface 211 will not hook the proximal end of the branch stent 200, ensuring that the clamping release structure 100 can smoothly disengage from the branch stent 200 and ensuring that the branch stent 200 is stably placed at the lesion position.

[0068] like Figure 5 As shown, in some embodiments, the distal end of the clamping portion 21 is provided with a second surface 212, which is inclined proximally away from the first clamping member 12. It should be noted that after the branch stent 200 is implanted at the lesion site, when the clamping release structure 100 clamps the proximal end of the branch stent 200, the second clamping member 20 will be located on one side of one of the channels 2022 of the branch stent 200. Before implanting the embedded stent in one of the channels 2022, a guidewire can be inserted from the proximal end of the branch stent 200, allowing the guidewire to enter one of the channels 2022. The inclined second surface 212 can guide the soft tip of the guidewire, making it easier for the guidewire to enter the branch vessel and preventing the second clamping member 20 from jamming the guidewire, thus facilitating the subsequent implantation of the embedded stent in one of the channels 2022. Therefore, this arrangement facilitates guidewire insertion, thereby improving the success rate of the surgical procedure.

[0069] For example, the second surface 212 is an inclined plane. In this way, when inserting the guidewire, it can not only provide better guidance for the soft tip of the guidewire, but also ensure that the guidewire can preferentially enter the branch blood vessel and avoid the guidewire getting stuck at the bifurcation of the branch blood vessel.

[0070] For example, the second surface 212 is a concave arc-shaped surface. In this way, when inserting the guidewire, it can provide a better guiding effect on the soft tip of the guidewire, so that the guidewire can be inserted into the branch blood vessel more smoothly.

[0071] For example, the second surface 212 is a convex arc-shaped surface. In this way, when inserting the guidewire, the convex part of the second surface 212 can contact the soft tip of the guidewire in advance, so that the guidewire can enter the branch blood vessel more preferentially and avoid the guidewire getting stuck at the bifurcation of the branch blood vessel.

[0072] like Figure 1 and Figure 2 As shown, in some embodiments, the clamping release structure 100 further includes an elastic element 40, which is disposed between the clamping portion 21 and the connecting seat 11. One end of the elastic element 40 abuts against the connecting seat 11, and the other end abuts against the proximal end of the clamping portion 21, so that the first clamping surface 121 of the clamping portion 21 can be in close contact with the second clamping surface 211, ensuring effective clamping of the proximal end of the branch bracket 200.

[0073] For example, the elastic element 40 surrounds the wire drawing 30. The elastic element 40 provides support for the wire drawing 30, while the wire drawing 30 also ensures the elastic element 40 is firmly positioned and not easily deviated. Furthermore, placing the elastic element 40 and the wire drawing 30 together saves space, allowing the elastic element 40 to be rationally positioned between the clamping part 21 and the connecting seat 11. For example, the elastic element 40 is a spring.

[0074] like Figure 4 As shown, in some embodiments, the base 10 is provided with a through hole 10a passing through the first clamping member 12 and the connecting seat 11, the through hole 10a being for the conveyor sheath core 600 to pass through. In this way, the sheath core 600 and the clamping release structure 100 are coaxially arranged, so that the clamping release structure 100 can be more compact when applied to the conveyor, so as to facilitate the insertion of the sheath tube 500.

[0075] like Figure 1 and Figure 4 As shown, in some embodiments, the first clamping member 12 is not a cylindrical structure. Specifically, it is a non-cylindrical structure formed by the chordal cutting of a cylinder coaxial with the connecting hole 10a to form the first clamping surface 121. The connecting hole 10a is located at the axial center of the connecting seat 11, which is beneficial for the connecting seat 10a and the push rod 400 to be coaxial and have the same outer side wall structure. The non-cylindrical first clamping member 12 forms an eccentric setting structure with the connecting hole 10a. In this way, the side of the first clamping member 12 with the first clamping surface 121 has sufficient space to accommodate the clamping part 21. This ensures that the connecting hole 10a is centered in the clamping and releasing structure 100.

[0076] like Figure 1 and Figure 4 As shown, in some embodiments, the connecting seat 11 is cylindrical and has the same diameter as the cylindrical push rod 400 of the conveyor to ensure a tight connection between the connecting seat 11 and the push rod 400, and to allow the clamping release structure 100 and the push rod 400 to be inserted into the sheath 500.

[0077] For example, the connecting seat 11 is provided with a first wire drawing channel 10b on one side of the clamping part 21, and maintains communication with the connecting hole 10a to ensure that the wire drawing 30 can slide smoothly.

[0078] like Figure 5 As shown, in some embodiments, the first clamping surface 121 and the second clamping surface 211 clamp the proximal end of the branch bracket 200 through the clamping force generated by the interference fit. In this embodiment, the first clamping surface 121 abuts against one side of the proximal end of the branch bracket 200, and the second clamping surface 211 abuts against the other side of the proximal end of the branch bracket 200 to clamp the proximal end of the branch bracket 200 and achieve fixation of the proximal end of the branch bracket 200. The clamping release structure 100 of this embodiment can be applied to clamp the proximal end of the branch bracket 200 without a hook portion.

[0079] For example, both the first clamping surface 121 and the second clamping surface 211 are planar. This facilitates clamping and prevents the proximal end of the branch bracket 200 from snagging when it disengages. It also simplifies manufacturing.

[0080] In other examples, the first clamping surface 121 and the second clamping surface 211 are mating arc surfaces. Specifically, one of the first clamping surface 121 and the second clamping surface 211 is a concave arc surface, and the other is a convex arc surface. For example, the first clamping surface 121 and the second clamping surface 211 are axially curved and mating arc surfaces. In this way, when clamping the proximal end of the branch bracket 200, the proximal end of the branch bracket 200 can be slightly bent axially, which can further clamp the proximal end of the branch bracket 200 and prevent the proximal end of the branch bracket 200 from arbitrarily disengaging from the emergency release structure. As another example, the first clamping surface 121 and the second clamping surface 211 are radially curved and mating arc surfaces. In this way, while ensuring stable clamping of the proximal end of the branch bracket 200, it is beneficial for the proximal end of the branch bracket 200 to disengage from the emergency release structure when releasing the proximal end of the branch bracket 200. For example, the first clamping surface 121 and the second clamping surface 211 are mutually cooperating spherical arc surfaces, which can further ensure stable clamping of the proximal end of the branch support 200.

[0081] like Figure 6As shown, in some embodiments, an adapter structure 90 is further provided between the first clamping surface 121 and the second clamping surface 211. The adapter structure 90 includes a protrusion and a groove. The protrusion is adapted to and placed in the groove. The protrusion is formed on one of the first clamping surface 121 and the second clamping surface 211, and the groove is formed on the other of the first clamping surface 121 and the second clamping surface 211. The protrusion is used to pass through the through hole at the proximal end of the branch bracket 200. In this embodiment, when the first clamping surface 121 and the second clamping surface 211 clamp the proximal end of the branch bracket 200, the protrusion of the adapter structure 90 can pass through the through hole at the proximal end of the branch bracket 200 to hook the proximal end of the branch bracket 200, thereby fixing the proximal end of the branch bracket 200 and preventing the proximal end of the branch bracket 200 from disengaging from the clamping release structure 100 when it is not unlocked. The clamping release structure 100 of this embodiment can be applied to clamp the proximal end of the branch bracket 200 with the hook portion.

[0082] For example, a protrusion is formed on the first clamping surface 121, and a groove is formed on the second clamping surface 211.

[0083] For example, such as Figure 6 As shown, the adapter structure 90 is located between the distal and proximal ends of the second clamping surface 211. This adapter structure 90 is fully enclosed between the first clamping surface 121 and the second clamping surface 211 to stably clamp the branch support 200 with multiple clampable portions. The clamping release structure 100 of this example can be applied to branch supports 200 with a longer distal V-shaped structure or with wire clips. In other examples, such as... Figure 7 As shown, the adapter structure 90 is located at the distal end of the second clamping surface 211. This adapter structure 90 is semi-enclosed between the first clamping surface 121 and the second clamping surface 211 to stably clamp the branch support 200 with a limited clamping portion. The clamping release structure 100 of this example can be applied to a shorter V-shaped structure at the distal end.

[0084] For example, the protrusion and the through hole at the proximal end of the branch bracket 200 are adapted to each other. When the proximal end of the branch bracket 200 is clamped by the first clamping surface 121 and the second clamping surface 211, the position of the proximal end of the branch bracket 200 can be further ensured to be fixed. For example, the protrusion is a cylinder, and the corresponding through hole at the proximal end of the branch bracket 200 is a circular through hole. As another example, the protrusion is a triangular prism, and the corresponding through hole at the proximal end of the branch bracket 200 is a triangular through hole.

[0085] For example, such as Figure 6 and Figure 7As shown, the proximal end of the protrusion has a third surface, which is inclined towards the proximal end in a direction away from the first clamping member 12. When the proximal end of the branch stent 200 disengages from the clamping release structure 100, the inclined third surface can provide guidance for the proximal disengagement of the branch stent 200, ensuring that the clamping release structure 100 can smoothly disengage from the branch stent 200, preventing the protrusion from hooking onto the proximal end of the branch stent 200, and ensuring that the branch stent 200 is stably placed at the lesion position without shifting due to hooking.

[0086] like Figure 9 As shown, the conveying system of this embodiment includes a conveyor, which includes a sheath core 600, a push rod 400, a sheath tube 500, a handle 300, and a clamping and releasing structure 100.

[0087] The proximal end of the push rod 400 is connected to the handle 300, and the distal end of the push rod 400 is connected to the connecting seat 11. The sheath core 600 passes through the push rod 400 and the clamping release structure 100. The sheath tube 500 is sleeved on the outside of the push rod 400 and the clamping release structure 100. The handle 300 is used to control the axial movement of the sheath tube 500 relative to the push rod 400. The proximal end of the wire drawing 30 is placed on the handle 300 and at least partially exposed outside the handle 300, so that the operator can pull the proximal end of the wire drawing 30 to make the second clamping member 20 swing.

[0088] During the delivery of the branch stent 200, the clamp-release structure 100 clamps the proximal end of the branch stent 200. The branch stent 200, clamp-release structure 100, and push rod 400 are all housed within the sheath 500. After the branch stent 200 is delivered to the lesion site via the delivery device, the sheath 500 is moved proximally relative to the branch stent 200, clamp-release structure 100, and push rod 400 by the handle 300 to release the branch stent 200, allowing it to anchor against the vessel wall at the lesion site. Figure 8 As shown, after ensuring the position of the proximal end of the branch stent 200 is determined, the proximal end of the pull wire 30 at the handle 300 can be pulled, causing the distal end of the pull wire 30 to swing the clamping part 21 away from the first clamping surface 121, separating the first clamping surface 121 and the second clamping surface 211 to release the proximal end of the branch stent 200. Then, the push rod 400 and the clamping release structure 100 are withdrawn to disengage the proximal end of the branch stent 200 from the clamping release structure 100, thereby completing the implantation of the branch stent 200 and ensuring that its post-implantation morphology is determined.

[0089] like Figure 9 and Figure 10As shown, in some embodiments, the connecting seat 11 and the distal end of the push rod 400 are fastened together. Specifically, the connecting seat 11 is provided with a plurality of connecting posts 13 located on both sides of the through hole, and correspondingly, the distal end of the push rod 400 is provided with a plurality of connecting holes. The plurality of connecting posts 13 and the plurality of connecting holes correspond one-to-one, and the connecting posts 13 are embedded in the connecting holes to achieve a fastened connection between the connecting seat 11 and the push rod 400.

[0090] For example, such as Figure 11 As shown, the outer surface of the connecting post 13 is provided with one or more annular grooves, similar to a stepped structure. The connecting post 13 and the connecting hole are adapted to achieve a tight connection. The annular grooves not only increase the contact area but also effectively prevent axial displacement of the clamping release structure 100. Specifically, during molding, the connecting hole can be filled by injection molding, and the cooled and solidified connecting post 13 will form a tight mechanical lock within the connecting hole.

[0091] In other examples, such as Figure 12 As shown, the small hole on the side wall of the connecting post 13 has a diameter designed according to the wall thickness of the cylinder. It can be a through hole or a blind hole. The connecting post 13 and the connecting hole are adapted to achieve a tight connection. This design can greatly increase the pull-out resistance of the connecting post 13 and prevent it from slipping off under axial force. Specifically, during the molding process, a protrusion can be provided on the side wall of the connecting hole. When the connecting post 13 is injection molded, the plastic flows into the connecting hole to form the aforementioned connecting post 13, achieving a mechanical lock between it and the connecting hole.

[0092] In some other examples, such as Figure 10 As shown, the sidewall of the connecting post 13 is provided with threads or knurling to improve surface roughness. The connecting post 13 and the connecting hole are adapted to achieve a tight connection. This increases the friction between the connecting post 13 and the connecting hole, preventing the connecting post 13 from sliding axially. Specifically, during molding, fine threads can be machined on the sidewall of the connecting hole, or the surface of the sidewall of the connecting hole can be micro-sandblasted, knurled, or otherwise surface-treated to increase its surface roughness. When the connecting post 13 is injection molded, after curing, it can be tightly locked onto the rough surface, achieving a mechanical lock between it and the connecting hole.

[0093] like Figure 9 As shown, in some embodiments, the push rod 400 and the connecting seat 11 are coaxially arranged and have the same diameter. This ensures that the push rod 400 and the clamping release structure 100 can be stably housed within the sheath tube 500 for easy transport. The push rod 400 has a through hole corresponding to the connecting hole 10b of the clamping release structure 100 for the sheath core 600 to pass through. Furthermore, the push rod 400 also has a second wire drawing channel corresponding to the first wire drawing channel 10b. The wire 30 passes through the first wire drawing channel 10b and the second wire drawing channel to ensure that the wire 30 can slide smoothly.

[0094] like Figure 9 and Figure 13 As shown, in some embodiments, the handle 300 is provided with a locking structure 301 to fix the proximal end of the wire 30, thereby ensuring the stable clamping of the clamping release structure 100 on the proximal end of the branch bracket 200. When it is necessary to pull the wire 30, the locking structure 301 can be removed from the handle 300 to release the proximal end of the branch bracket 200. Specifically, the locking structure 301 is provided with a gripper. By tightening the locking structure 301 at the distal end, the gripper clamps the wire 30, thereby ensuring the stable clamping of the clamping release structure 100 on the proximal end of the branch bracket 200. When it is necessary to release the branch bracket 200, the locking structure 301 is unlocked, causing the gripper to release the wire 30, allowing it to be pulled backward, thus completing the release of the proximal end of the branch bracket 200.

[0095] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A clamping release structure applied to a conveyor for conveying branch supports, characterized in that, include: The base includes a connecting seat and a first clamping member connected to each other. The first clamping member is connected to the distal end of the connecting seat, and the first clamping member has a first clamping surface on one side in the radial direction. The second clamping member includes a clamping part and a connecting part connected to each other. The connecting part is elastic. The proximal end of the connecting part is connected to the base, and the distal end of the connecting part is connected to the clamping part. The clamping part and the first clamping member are arranged side by side in a radial direction. The clamping part is provided with a second clamping surface. The second clamping surface and the first clamping surface can jointly clamp the proximal side of the branch bracket. The wire is drawn, with its distal end connected to the clamping part and its proximal end positioned at the distal end of the conveyor.

2. The clamping release structure as described in claim 1, characterized in that, The connecting portion is inclined away from the clamping portion along the direction from the distal end to the proximal end.

3. The clamping release structure as described in claim 2, characterized in that, The connecting portion surrounds a portion of the first clamping member, and the proximal end of the connecting portion is connected to the connecting seat.

4. The clamping release structure as described in claim 1, characterized in that, The proximal side of the clamping part is provided with a first surface adjacent to the second clamping surface, and the first surface is inclined towards the proximal end in a direction away from the first clamping member.

5. The clamping release structure as described in claim 1, characterized in that, The distal end of the clamping part is provided with a second surface, which is inclined toward the proximal end in a direction away from the first clamping member.

6. The clamping release structure as described in claim 1, characterized in that, It also includes an elastic element disposed between the clamping portion and the connecting seat; and / or, the elastic element surrounds the wire drawing.

7. The clamping release structure as described in claim 1, characterized in that, The base has a connecting hole that passes through the first clamping member and the connecting seat. The connecting hole is located at the axial center of the connecting seat and at an off-center position from the axial center of the first clamping member. The connecting hole is used for the conveyor sheath core to pass through.

8. The clamping release structure as described in claim 1, characterized in that, An adapter structure is provided between the first clamping surface and the second clamping surface. The adapter structure includes a protrusion and a groove. The protrusion is adapted to and can be placed in the groove. The protrusion is formed on one of the first clamping surface and the second clamping surface, and the groove is formed on the other of the first clamping surface and the second clamping surface. The protrusion is used to pass through the proximal end of the branch bracket.

9. A conveying system, characterized in that, The device includes a conveyor comprising a sheath core, a push rod, a sheath tube, a handle, and a clamping release structure as described in any one of claims 1 to 8; The proximal end of the push rod is connected to the handle, the distal end of the push rod is connected to the connecting seat, the sheath core passes through the push rod and the clamping release structure, the sheath tube is sleeved on the outside of the push rod and the clamping release structure, the handle is used to control the sheath tube to move axially relative to the push rod, and at least part of the proximal end of the wire drawing can be exposed outside the handle.

10. The conveying system as described in claim 9, characterized in that, It also includes a branch support, which includes a main body segment and a proximal segment connected to each other. The proximal segment includes two channels arranged in parallel along the radial direction. The proximal side of the proximal segment includes a connecting end located between the two channels. The first clamping surface and the second clamping surface can clamp the connecting end. The arrangement direction of the two channels is the same as the arrangement direction of the first clamping member and the second clamping member.

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