Conveyor and stent delivery system

Abstract

The present application relates to a kind of conveyor and stent delivery system, wherein, conveyor includes sheath core, TIP head connected with the distal end of sheath core, push rod set outside sheath core, sheath tube set outside push rod and be arranged in the catcher of push rod, the distal end of push rod and TIP head define the loading area for accommodating stent between, sheath tube can be moved relative to sheath core along the axial direction of sheath core to close loading area or open loading area, catcher has the capture state for capturing stent and release state, when sheath tube and TIP head converge and close loading area, catcher is in capture state and can bind the proximal end of stent, when sheath tube is withdrawn and opens loading area, catcher is in release state and can release the proximal end of stent. According to the conveyor of the present application, the stent can be prevented from moving to the distal end side under the drive of sheath tube, thereby effectively solving the problem that the distal end of stent accumulates and the gap between the proximal end of stent and the distal end of push rod is too large.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a delivery device and stent delivery system. Background Technology

[0002] Stent implantation device systems are classified as Class III medical devices. These systems are pre-loaded with implants and are delivered and implanted into the lesion site via catheter-based intervention, puncturing a blood vessel, to prevent or treat the lesion in the target tissue.

[0003] Please combine Figure 1 and Figure 2 As shown, the existing stent 1' is generally a hyperelastic device. After being compressed, it is pre-loaded into the delivery sheath 2'. In order to reserve space for loading the stent, the sheath core has a stent loading area corresponding to the length of the stent. However, the lengths are inconsistent after the stent is compressed and loaded. When the stent is bifurcated, the proximal end is smaller than the distal end, and the proximal end fits loosely with the sheath. After the stent is loaded, rotating the sliding handle moves the sheath forward to close with the TIP head 4'. During this process, the sheath 2' will move the proximal part of the stent 1' forward, which will cause the distal end of the stent to accumulate and the gap between the proximal end of the stent and the distal end of the push rod 3' to be too large. During the release process after the stent is implanted into the human blood vessel, there are problems with release difficulties and the stent rebound effect. Summary of the Invention

[0004] The purpose of this invention is to at least solve the problem of excessive gap between the proximal end of the stent and the push rod caused by the movement of the stent during the forward movement and closing of the sheath. To address the shortcomings of existing technologies, this invention provides a conveyor and a stent conveying system.

[0005] The technical problem solved by this invention is achieved through the following technical solution:

[0006] According to a first aspect of the invention, a conveyor is provided, the conveyor comprising a sheath core, a TIP head connected to the distal end of the sheath core, a push rod sleeved outside the sheath core, a sheath tube sleeved outside the push rod, and a catch member disposed on the push rod, wherein the distal end of the push rod and the TIP head define a loading area for accommodating a support, the sheath tube being movable relative to the sheath core along the axial direction of the sheath core to close or open the loading area, the catch member having a catch state and a release state, wherein when the sheath tube and the TIP head are closed and the loading area is closed, the catch member is in the catch state and is capable of restraining the proximal end of the support, and when the sheath tube is retracted and the loading area is opened, the catch member is in the release state and is capable of releasing the proximal end of the support.

[0007] In some embodiments of the present invention, the capturing member includes a connecting portion connected to the distal end of the push rod and at least two grippers connected to the distal end of the connecting portion. The at least two grippers are arranged sequentially around the circumference of the sheath core and define an anchoring region for accommodating the distal end of the bracket between the outer circumferential surface of the sheath core and the grippers along the radial direction of the sheath core. In the capturing state, the grippers are squeezed by the sheath tube and bent toward the radial inward side, so that the at least two grippers can clamp the bracket. In the releasing state, the grippers separate from the sheath tube and elastically recover, so that the at least two grippers can release the bracket.

[0008] In some embodiments of the present invention, the at least two grippers are arranged in a ring around the axial direction of the sheath core. In the natural state, the maximum outer diameter of the at least two grippers along the radial direction is greater than the inner diameter of the sheath tube, and the minimum outer diameter of the at least two grippers along the radial direction is greater than the outer diameter of the sheath core.

[0009] In some embodiments of the present invention, in the natural state, the outer diameter of the at least two grippers gradually increases and then gradually decreases along the radial direction from the proximal end to the distal end.

[0010] In some embodiments of the present invention, the capturing member further includes an inner sleeve, the proximal end of which is connected to the connecting portion and sleeved over the sheath core, and the at least two grippers are arranged sequentially around the circumference of the inner sleeve and define an anchoring area for accommodating the distal end of the support between the outer circumferential surface of the inner sleeve and the grippers along the radial direction of the sheath core.

[0011] In some embodiments of the present invention, one of the outer peripheral surface of the inner liner sleeve and the inner wall surface of the gripper is provided with a groove, and the other is provided with a boss, the boss and the groove being arranged opposite to each other along the radial direction of the sheath core.

[0012] In some embodiments of the present invention, the outer wall surface of the gripper is provided with at least one elongated protrusion extending axially along the sheath core.

[0013] In some embodiments of the invention, the capture element includes at least one filament structure, which, in the capture state, is capable of restraining the proximal end of the support, and both ends of the filament structure extend to the outside of the proximal end of the sheath.

[0014] In some embodiments of the present invention, the tube wall of the push rod is provided with an axially extending threading hole, the distal end of the threading hole forms a first opening on the distal end face of the push rod, the proximal end of the threading hole forms a second opening on the outer peripheral surface of the push rod, the wire structure is inserted into the threading hole, the wire structure extends through the first opening to the distal end face of the push rod to bind the proximal end of the bracket, and both ends of the wire structure extend out of the push rod through the second opening.

[0015] According to a second aspect of the invention, a support conveying system is also provided, the support conveying system comprising a support and a conveyor as described in any one of the first aspects of the technical solution, the support being loaded within the loading area of ​​the conveyor.

[0016] According to the conveyor proposed in this invention, after the support is loaded into the loading area of ​​the conveyor, during the process of the sheath closing and sealing the loading area, the proximal end of the support is restrained by the capture member, which can prevent the support from moving to the distal end under the drive of the sheath. This effectively solves the problems of support accumulation at the distal end and excessive gap between the proximal end of the support and the distal end of the push rod. During the process of the sheath retracting and opening the loading area, since there is no problem of support accumulation at the distal end, the release of the proximal end of the support by the capture member can effectively reduce the difficulty of support release and enable the support to rebound according to the preset stroke, thereby improving the accuracy of support release. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0018] Figure 1 This is a schematic diagram of the structure of a support conveying system after its first assembly in the prior art.

[0019] Figure 2 This is a schematic diagram of the structure of the support conveying system after the second assembly in the prior art.

[0020] Figure 3 This is a schematic diagram of the support conveying system according to an embodiment of the present invention;

[0021] Figure 4 This is a partial structural diagram of a conveyor according to an embodiment of the present invention;

[0022] Figure 5 This is a partial cross-sectional structural diagram of the support and conveyor according to an embodiment of the present invention;

[0023] Figure 6This is a partial cross-sectional schematic diagram of the bracket, the capturing element, the sheath core, and the sheath tube according to one embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of a capturing element according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the bracket, the capturing element, and the sheath according to one embodiment of the present invention;

[0026] Figure 9 This is a cross-sectional structural diagram of the support, sheath core, and capture element according to one embodiment of the present invention;

[0027] Figure 10 This is a cross-sectional structural diagram of the capturing element and the bracket according to one embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the capture element according to an embodiment of the present invention, viewed from the axial direction of the sheath core.

[0029] Figure 12 This is a cross-sectional structural diagram of the capturing member and the support in the capturing state according to an embodiment of the present invention.

[0030] Figure 13 This is a schematic diagram of the support, capturing element, and push rod according to one embodiment of the present invention;

[0031] Figure 14 This is a schematic diagram of the handle assembly and the capture element according to an embodiment of the present invention;

[0032] Figure 15 This is a schematic diagram of the structure of the bracket, wire, and catcher according to an embodiment of the present invention;

[0033] Figure 16 This is a schematic diagram of the structure of the bracket, the capturing element, the push rod, and the sheath according to one embodiment of the present invention;

[0034] Figure 17 This is a schematic diagram of the sheath connector assembly, the catcher, and the push rod according to one embodiment of the present invention.

[0035] The labels in the attached diagram are as follows:

[0036] 1', Support; 2', Sheath; 3', Push Rod; 4', Tip Head;

[0037] 100. Conveyor; 101. Loading area;

[0038] 10. Sheath core;

[0039] 20. TIP header;

[0040] 30. Push rod; 31. Thread hole; 311. First opening;

[0041] 40. Sheath;

[0042] 50. Snapping element; 51. Connecting part; 52. Gripper; 521. Long strip protrusion; 53. Inner liner sleeve; 501. Anchoring area; 502. Boss; 503. Groove;

[0043] 60. Handle assembly; 61. Handle; 62. Sheath connector; 63. Washer; 64. Lock; 65. Screw; 651. Hollow slot; 66. Sliding handle;

[0044] 200. Support conveying system;

[0045] 210. Bracket; 211. Waveform; 212. Coating; 220. Thread; 221. Thread buckle. Detailed Implementation

[0046] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0047] 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.

[0048] 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.

[0049] 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 rotates, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0050] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end furthest from the operator during the procedure, while "proximal" refers to the end closest to the operator. Axial direction refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0051] like Figure 1 and Figure 2 As shown, in the existing support conveying system assembly process, the support 1' and sheath 2' are assembled in two stages. During the first stage of assembly (see...), Figure 1 The gap between the stent 1' and the sheath 2' is pre-set to a certain length. Then, the conveyor is assembled, and finally, a second assembly is performed. Rotating the sliding handle moves the sheath forward to close with the TIP head 4', completing the assembly of the stent and sheath. However, during the second assembly, the movement of the sheath 2' causes the stent 1' to move distally, resulting in distal accumulation of the stent 1' and an excessive gap between the proximal end of the stent 1' and the push rod 3'. This leads to difficulties in release and affects the stent's rebound effect.

[0052] Based on the above considerations, this invention proposes a conveyor 100, which includes a sheath core 10, a TIP head 20, a push rod 30, a sheath tube 40, and a capturing element 50. The TIP head 20 is connected to the distal end of the sheath core 10. The push rod 30 is sleeved outside the sheath core 10, and the distal end of the push rod 30 is spaced apart from the TIP head 20. A loading area 101 for accommodating a support 210 is defined between the distal end of the push rod 30 and the TIP head 20. The sheath tube 40 is sleeved outside the push rod 30. After the support 210 is loaded into the loading area 101 and completes its first closing assembly, the sheath tube 40 is driven to move distally and engage with the TIP head 50. During the closing of the P-head 20, the capturing element 50 binds the proximal end of the bracket 210, preventing the bracket 210 from moving to the distal end under the drive of the sheath 40. This effectively solves the problem of the distal end of the bracket 210 accumulating and the excessive gap between the proximal end of the bracket 210 and the distal end of the push rod 30. During the process of the sheath 40 retracting and opening the loading area 101, since there is no problem of distal end accumulation of the bracket 210, after the capturing element 50 releases the proximal end of the bracket 210, the difficulty of releasing the bracket 210 can be effectively reduced, and the bracket 210 can rebound according to the preset stroke, thus improving the accuracy of the bracket 210 release.

[0053] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0054] Example 1

[0055] In this embodiment, combined with Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, according to an embodiment of the present invention, a delivery device 100 is provided, comprising a sheath core 10, a TIP head 20, a push rod 30, a sheath tube 40, and a capture element 50. The TIP head 20 is connected to the distal end of the sheath core 10 and is located at the distal end of the delivery device 100. The TIP head 20 mainly serves a guiding function. During the insertion of the stent 210 into a specific part of the human body, the TIP head guides the delivery device 100 into the specific part, such as into a blood vessel or a specific surgical site, helping the entire delivery device 100 accurately reach the target position. The sheath core 10 is the supporting structure of the delivery device 100, providing stable support for components such as the push rod 30 and the sheath tube 40 sleeved on its exterior, ensuring that the entire delivery system maintains a certain shape and structural stability during the interventional operation. A push rod 30 is sleeved outside the sheath core 10 and is fixed relative to the sheath core 10. The distal end of the push rod 30 is spaced apart from the TIP head 20, defining a loading area 101 for accommodating the bracket 210 between the distal end of the push rod 30 and the TIP head 20. A sheath tube 40 is sleeved outside the push rod 30 and is axially movable relative to the push rod 30 and the sheath core 10. When the sheath tube 40 moves distally, it can close with the TIP head 20 to close the loading area 101, thus accommodating the bracket 210 inside the sheath tube 40. When the sheath tube 40 moves proximally, it separates from the TIP head 20 until the distal end of the sheath tube 40 retracts to the distal end of the push rod 30, at which point the sheath tube 40 completely detaches from the loading area 101, allowing the bracket 210 accommodated in the loading area 101 to be released.

[0056] The capturing element 50 includes a connecting portion 51 and at least two grippers 52. The connecting portion 51 has a tubular structure and is sleeved on the outside of the sheath core 10. The proximal end of the connecting portion 51 is connected to the distal end of the push rod 30. The connection between the capturing element 50 and the push rod 30 includes, but is not limited to, adhesive bonding. The grippers 52 are connected to the distal end of the connecting portion 51. The grippers 52 and the connecting portion 51 can be an integral structure. At least two grippers 52 are arranged sequentially and spaced apart around the circumference of the sheath core 10. Along the radial direction of the sheath core 10, an anchoring area 501 for accommodating the distal end of the support 210 is defined between the outer circumferential surface of the sheath core 10 and the grippers 52. During the assembly of the bracket 210, the proximal end of the bracket 210 is first inserted into the anchoring area 501. The sheath 40 is then moved distally. When the inner wall of the sheath 40 contacts the gripper 52, the sheath 40 compresses the gripper 52, causing it to bend radially inward, reducing the gap between the gripper 52 and the outer peripheral surface of the sheath core 10. Multiple grippers 52 and the outer peripheral surface of the sheath core 10 clamp and anchor the proximal end of the bracket 210. After the conveyor 100 delivers the bracket 210 to the target position, the sheath 40 is moved proximally. When the sheath 40 disengages from the gripper 52, the gripper 52 elastically recovers, and the gripper 52 and the outer peripheral surface of the sheath core 10 release the proximal end of the bracket 210, allowing the bracket 210 to detach from the anchoring area 501, thus completing the release of the bracket 210.

[0057] In this embodiment, all the grippers 52 are arranged in a ring around the circumference of the sheath core 10. In its natural state, the maximum outer diameter of at least two grippers 52 in the radial direction is greater than the inner diameter of the sheath tube 40. When the sheath tube 40 moves distally and the interior of the sheath tube 40 gradually contacts the radial outer wall of the grippers 52, the outer diameter of the grippers 52 is greater than the inner diameter of the sheath tube 40, causing the inner wall of the sheath tube 40 to exert a radially inward pressure on the grippers 52. Under this pressure, the grippers 52 bend and deform in the radial direction. The difference between the maximum radial outer diameter of at least two grippers 52 and the inner diameter of the sheath tube 40 is the deformation of the grippers 52 in the radial direction. Furthermore, the minimum radial outer diameter of at least two grippers 52 is set to be greater than the outer diameter of the sheath core 10. On the one hand, this creates a space between the grippers 52 and the outer circumferential surface of the sheath core 10 to accommodate the support 210. On the other hand, it provides the space required for the bending deformation of the grippers 52.

[0058] It should be noted that the difference A between the maximum radial outer diameter L1 of at least two grippers 52 and the inner diameter L2 of the sheath 40 is equal to the difference B between the minimum radial outer diameter L3 of at least two grippers 52 and the outer diameter L4 of the sheath core 10. This ensures that after all grippers 52 are deformed under the pressure of the sheath 40, the maximum radial outer diameter of all grippers 52 is equal to the inner diameter of the sheath 40. This avoids interference fit between the grippers 52 and the sheath 40 when the sheath 40 and the TIP head 20 are closed, allowing the sheath 40 to move smoothly axially relative to the capture member 50 and the sheath core 10. Furthermore, it allows the grippers 52 to have sufficient deformation to clamp the support 210, ensuring a more secure grip on the support 210 and preventing the support 210 from loosening under the influence of the sheath 40.

[0059] Furthermore, in its natural state, the outer diameter of the cylindrical structure gradually increases and then gradually decreases from the proximal end to the distal end. That is, the area where the outer contour of the gripper 52 of the capture member 50 is connected to the connecting part 51 is set to a frustum shape, which provides a guiding effect during the axial movement of the sheath 40, so that the sheath 40 can move smoothly axially.

[0060] Furthermore, the outer wall surface of the gripper 52 is provided with at least one elongated protrusion 521 extending axially along the sheath core 10 (see...). Figure 7 The elongated protrusions 521 contact the inner wall of the sheath 40, reducing the contact area between the capturing member 50 and the inner wall of the sheath 40, thereby reducing the friction between the sheath 40 and the gripper 52. In this embodiment, each gripper 52 has multiple elongated protrusions 521 on its outer wall, and these protrusions are arranged sequentially and at intervals along the circumference of the capturing member 50. In other embodiments, an elongated groove can be provided on the inner wall of the sheath 40, and the elongated protrusions 521 of the gripper 52 can fit into the groove. During axial movement, the sheath 40 can slide along the mating path of the groove and the elongated protrusions 521, preventing the sheath 40 from twisting and reducing the difficulty of sheath removal.

[0061] In some embodiments, a polytetrafluoroethylene (PTFE) coating is provided on the surface of the contact surface between the gripper 52 of the capturing member 50 and the sheath 40, which gives the surface good sliding properties, effectively improves surface friction, and reduces the impact on the movement of the sheath 40. PTFE (polytetrafluoroethylene) has the following characteristics: high continuous operating temperature, low coefficient of friction, good wear resistance, and chemical corrosion resistance.

[0062] Example 2

[0063] The differences between Example 2 and Example 1 will be described below. The similarities or similarities between Example 2 and Example 1 will not be repeated here.

[0064] In this embodiment, please refer to Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the capturing component 50 also includes an inner sleeve 53, which has a cylindrical structure. The proximal end of the inner sleeve 53 is connected to the connecting part 51 and sleeved on the outside of the sheath core 10. The inner sleeve 53, the grippers 52 and the connecting part 51 are an integral structure. The inner sleeve 53 is located in the internal space enclosed by multiple grippers 52, so that all the grippers 52 are arranged sequentially around the circumference of the inner sleeve 53. Along the radial direction of the sheath core 10, an anchoring area 501 for accommodating the distal end of the support 210 is defined between the outer peripheral surface of the inner sleeve 53 and the grippers 52.

[0065] When assembling the bracket 210, the proximal end of the bracket 210 is first inserted into the anchoring area 501 between the gripper 52 and the inner sleeve 53. The sheath 40 is then moved distally. When the inner wall of the sheath 40 contacts the gripper 52, the sheath 40 compresses the gripper 52, causing it to bend radially inward, reducing the gap between the gripper 52 and the outer circumferential surface of the inner sleeve 53. Multiple grippers 52 and the outer circumferential surface of the inner sleeve 53 clamp and anchor the proximal end of the bracket 210. After the conveyor 100 delivers the bracket 210 to the target position, the sheath 40 is moved proximally. When the sheath 40 disengages from the gripper 52, the gripper 52 elastically recovers, and the outer circumferential surface of the gripper 52 and the inner sleeve 53 releases the proximal end of the bracket 210, allowing the bracket 210 to detach from the anchoring area 501, thus completing the release of the bracket 210.

[0066] In this embodiment, by providing an inner sleeve 53 compared to the scheme without an inner sleeve 53, the radial dimension of the anchoring area 501 is reduced, thereby reducing the radial bending deformation of the gripper 52, reducing the squeezing of the sheath tube 40 on the four-jaw structure, and reducing the impact on the movement of the sheath tube 40.

[0067] Specifically, such as Figure 9 and Figure 10 As shown. Since the long branch of the support 210 is compressed and clamped onto the sheath core 10 by the gripper 52, the outer diameter D3 of the sheath core 10 determines the minimum compression diameter L. The minimum compression diameter L5 is equal to the inner diameter D2 of the four-jaw structure minus the outer diameter D3 of the sheath core 10. When the long branch of the support 210 is loaded onto the inner sleeve 53, the minimum compression diameter L6 is equal to the inner diameter D2 of the gripper 52 minus the outer diameter D4 of the inner sleeve. Since the outer diameter D4 of the inner sleeve is greater than the outer diameter D3 of the sheath core 10, the minimum compression L6 is less than the minimum compression L5. Therefore, the deformation of the gripper 52 is effectively reduced, the squeezing of the sheath tube 40 on the gripper 52 is reduced, and the impact of the movement of the sheath tube 40 is reduced.

[0068] Furthermore, one of the outer peripheral surface of the inner sleeve 53 and the inner wall surface of the gripper 52 is provided with a groove 503, and the other is provided with a boss 502. The boss 502 and the groove 503 are arranged opposite each other along the radial direction of the sheath core 10. When the gripper 52 is compressed and clamps the bracket 210, the boss 502 can be inserted into the groove 503, so that the gripper 52 and the inner sleeve 53 form an interlocking structure, which improves the clamping force of the capture member 50 on the bracket 210 and prevents the bracket 210 from moving and loosening under the drive of the sheath tube 40.

[0069] In some embodiments, the outer peripheral surface of the inner sleeve 53 is provided with two bosses 502 symmetrically arranged around the axis of the inner sleeve 53, and two grippers 52 opposite to the two bosses 502 are respectively provided with a groove 503, and the gripping force of the capture member 50 on the bracket 210 is further improved by the two bosses 502.

[0070] In this embodiment, the support 210 includes a membrane 212 and a plurality of corrugated coils 211. The plurality of corrugated coils 211 are arranged sequentially along the length direction of the support 210. The plurality of corrugated coils 211 are fixed on the membrane 212. The positions where corrugated coils 211 are provided form a convex surface at the membrane 212, and the positions where no corrugated coils 211 are provided form a concave surface at the membrane 212, thereby forming an uneven surface, such as... Figure 10 , Figure 11 and Figure 12 As shown, when the long branch of the bracket 210 is assembled in the anchoring area 501, the boss 502 and the groove 503 are aligned with the concave surface of the film 212 without the corrugated ring 211. During compression clamping, the boss 502 and the groove 503 are clamped on the concave surface of the film 212 without the corrugated ring 211, that is, between the two corrugated rings 211 in front, forming a limit and improving the effect of preventing the long branch of the bracket 210 from moving back and forth.

[0071] Example 3

[0072] The differences between Example 3 and Example 1 will be described below. The similarities or similarities between Example 3 and Example 1 will not be repeated here.

[0073] In this embodiment, please refer to Figure 13 , Figure 14 and Figure 15As shown, the capture element 50 includes at least one wire structure capable of binding the proximal end of the support, and both ends of the wire structure capture element extend to the outside of the proximal end of the sheath. For example, after the support 210 is loaded into the loading area 101 and completes the first closing assembly, the capture element 50 is passed through the tail end of the long branch of the support 210, thereby using the capture element 50 to bind the proximal end of the support 210. During the process of driving the sheath 40 to move to the distal end and close with the TIP head 20, the capture element 50 binds the proximal end of the support 210 and pulls the tail end of the long branch of the support 210 through the distal control line to prevent the support 210 from moving with the sheath 40, thereby eliminating the problems of support 210 stacking and excessive gaps. Both ends of the capture element 50 extend to the outside of the proximal end of the sheath 40. When the sheath 40 and the TIP head 20 are closed, one end of the capture element 50 is pulled to remove the capture element 50, completing the assembly. It should be noted that the capturing element 50 may also include multiple filament structures, each of which may be a parallel two-strand structure. That is, one end of the filament structure passes through the tail end of the long branch of the support 210, folds back, and extends to the outside of the proximal end of the sheath, thus forming two parallel strands. The number of filament structures can be set as needed.

[0074] In this embodiment, as Figure 13 As shown, the tube wall of the push rod 30 is provided with an axially extending threading hole 31. The distal end of the threading hole 31 forms a first opening 311 on the distal end face of the push rod 30, and the proximal end of the threading hole 31 forms a second opening (not shown in the figure) on the outer circumferential surface of the push rod 30. The capturing member 50 is inserted into the threading hole 31 and extends through the first opening 311 to the distal end face of the push rod 30 to bind the proximal end of the support 210. Both ends of the capturing member 50 extend out of the push rod 30 through the second opening. In this embodiment, a through hole is drilled radially at the middle position of the push rod 30, so that the through hole communicates with the threading hole 31 to form a second opening. The through hole is drilled vertically from the outer surface of the push rod 30 to the circumferential threading hole 31 of the multi-cavity push rod 30, thereby guiding the wire 220 out and avoiding drilling into the central main cavity of the push rod 30 to prevent the wire 220 from being unable to pass through.

[0075] Because the thread-shaped catcher 50 has a hole on each side of the long branch of the bracket 210, the bracket 210 is fixed by tension using the catcher 50. However, the tension is too concentrated, which may cause some tensile damage to the distal end of the long branch of the bracket 210. In some embodiments, in order to avoid excessive tension concentration, a thread buckle 221 is provided at the proximal end of the long branch of the bracket 210. The number of thread buckles 221 is set to 2, and the two thread buckles 221 are arranged symmetrically about the axis of the long branch of the bracket 210. Specifically, a suture thread 220 is used to suture around the proximal end of the long branch of the support 210. The suture thread 220 has multiple holes on the support 210, which are arranged sequentially around the long branch of the support 210 in the circumferential direction, so that the suture thread 220 can wrap around the long branch of the support 210 at least once. A suture knot 221 is tied at both ends of the suture thread 220 on both sides of the long branch of the support 210. The catcher 50 passes through the inner holes of the two suture knots 221 and stretches, so that the tensile force is distributed in the entire circumferential direction of the long branch of the support 210, reducing the local stress generated when the long branch of the support 210 is subjected to the tension of the catcher 50, and reducing the probability of damage to the long branch of the support 210 under the tension of the catcher 50.

[0076] In this embodiment, the conveyor 100 further includes a handle assembly 60, which includes a screw 65 sleeved on the push rod 30 and a sliding handle 66 rotatably sleeved on the screw 65. The screw 65 is provided with a slot 651 that radially penetrates the screw 65. Both ends of the capture member 50 pass through the slot 651 and exit the handle assembly 60 to facilitate the operator's control of the capture member 50. The operator drives the sheath to move relative to the push rod by rotating the sliding handle 66.

[0077] It should also be noted that in this embodiment, after the sheath tube 40 is closed and the capture member 50 is removed, glue is used to seal the through hole provided by the push rod 30 to seal the second opening and complete the assembly.

[0078] Example 4

[0079] The differences between Example 4 and Example 3 will be described below. The similarities or similarities between Example 4 and Example 3 will not be repeated here.

[0080] In this embodiment, please refer to Figure 16 and Figure 17As shown, the push rod 30 does not have a threading hole 31. The capture member 50 extends through the gap between the sheath tube 40 and the push rod 30. The delivery device 100 also includes a sheath tube connector assembly for connecting the sheath tube 40 and the handle 61. The capture member 50 passes through the inner hole of the sheath tube connector assembly. Both ends of the capture member 50 first pass through the inner hole of the sheath tube connector assembly, and then pass through the slot 651 of the screw 65, thus extending to the outside of the delivery device 100. The sheath tube connector assembly includes a sheath tube connector 62, a washer 63, and a locking head 64, which are sequentially fitted around the sheath tube 40 from distal to proximal. The washer 63 is made of elastic silicone material and is interference-fitted with the push rod 30. The washer 63 and the push rod 30 form a sealing structure inside the sheath tube 40 assembly, which has a hemostatic function during interventional treatment. When the sheath connector assembly inserts the capture element 50, the elasticity of the washer 63 allows the capture element 50 to be inserted and removed normally. After the sheath 40 is closed and the support 210 is fixed, the capture element 50 can be removed normally. The elastic material of the interference fit washer 63 automatically fills the space originally occupied by the capture element 50, without affecting the original hemostatic function.

[0081] According to embodiments of the present invention, such as Figure 2 As shown, a stent delivery system 200 is also proposed, which includes a stent 210 and a conveyor 100, with the stent 210 loaded in the loading area 101 of the conveyor 100. According to the stent delivery system 200 proposed in this invention, after the stent 210 is loaded into the loading area 101 of the conveyor 100, during the process of the sheath 40 closing and sealing the loading area 101, the proximal end of the stent 210 is restrained by the capturing member 50, preventing the stent 210 from moving to the distal end under the influence of the sheath 40. This effectively solves the problems of stent 210 accumulation at the distal end and excessive gap between the proximal end of the stent 210 and the distal end of the push rod 30. During the process of the sheath 40 retracting and opening the loading area 101, since there is no problem of stent 210 accumulation at the distal end, the release difficulty of the stent 210 is effectively reduced after the capturing member 50 releases the proximal end of the stent 210, and the stent 210 can rebound according to a preset stroke, improving the accuracy of stent 210 release.

[0082] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A conveyor, characterized in that, The conveyor includes a sheath core, a TIP head connected to the distal end of the sheath core, a push rod sleeved outside the sheath core, a sheath tube sleeved outside the push rod, and a capture member located at the distal end of the push rod. The distal end of the push rod and the TIP head define a loading area for accommodating a support. The sheath tube is movable relative to the sheath core along the axial direction of the sheath core to close or open the loading area. The capture member has a capture state and a release state. When the sheath tube and the TIP head close together to close the loading area, the capture member is in the capture state and can restrain the proximal end of the support. When the sheath tube retracts and opens the loading area, the capture member is in the release state and can release the proximal end of the support.

2. The conveyor according to claim 1, characterized in that, The capturing element includes a connecting portion connected to the distal end of the push rod and at least two grippers connected to the distal end of the connecting portion. The at least two grippers are arranged sequentially around the circumference of the sheath core and define an anchoring area for accommodating the distal end of the bracket between the outer circumferential surface of the sheath core and the grippers along the radial direction of the sheath core. In the capture state, the grippers are squeezed by the sheath and bent toward the radial inward side, so that the at least two grippers can clamp the bracket; In the released state, the grippers separate from the sheath and elastically return to their original position, allowing the at least two grippers to release the support.

3. The conveyor according to claim 2, characterized in that, The at least two grippers are arranged in a ring around the axial direction of the sheath core. In the natural state, the maximum outer diameter of the at least two grippers along the radial direction is greater than the inner diameter of the sheath tube, and the minimum outer diameter of the at least two grippers along the radial direction is greater than the outer diameter of the sheath core.

4. The conveyor according to claim 3, characterized in that, In its natural state, from the proximal end to the distal end, the outer diameter of the at least two grippers along the radial direction first gradually increases and then gradually decreases.

5. The conveyor according to claim 2, characterized in that, The capture element further includes an inner sleeve, the proximal end of which is connected to the connecting portion and sleeved over the sheath core. The at least two grippers are arranged sequentially around the circumference of the inner sleeve and define an anchoring area for accommodating the distal end of the support between the outer circumferential surface of the inner sleeve and the grippers along the radial direction of the sheath core.

6. The conveyor according to claim 5, characterized in that, One of the outer peripheral surface of the inner liner sleeve and the inner wall surface of the gripper is provided with a groove, and the other is provided with a boss. The boss and the groove are arranged opposite to each other along the radial direction of the sheath core.

7. The conveyor according to any one of claims 2 to 6, characterized in that, The outer wall surface of the gripper is provided with at least one elongated protrusion extending axially along the sheath core.

8. The conveyor according to claim 1, characterized in that, The capture element includes at least one filament structure, which, in the capture state, is capable of restraining the proximal end of the support, and both ends of the filament structure extend to the outside of the proximal end of the sheath.

9. The conveyor according to claim 8, characterized in that, The push rod has an axially extending threading hole in its tube wall. The distal end of the threading hole forms a first opening on the distal end face of the push rod, and the proximal end of the threading hole forms a second opening on the outer peripheral surface of the push rod. The wire structure passes through the threading hole and extends through the first opening to the distal end face of the push rod to bind the proximal end of the bracket. Both ends of the wire structure extend out of the push rod through the second opening.

10. A support conveying system, characterized in that, The support conveying system includes a support and a conveyor as described in any one of claims 1 to 9, wherein the support is loaded within the loading area of ​​the conveyor.

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