Conveyor and conveying system

Abstract

The present application relates to a delivery device and a delivery system, the delivery device comprising an inner sheath core, an outer sheath core, an outer sheath tube and a delivery handle, a restraint and a fixing anchor, the proximal ends of the inner sheath core, the outer sheath core and the outer sheath tube being connected to the delivery handle so as to be axially relatively movable under the adjustment of the delivery handle; the restraint being fixed to the distal end of the inner sheath core, and the fixing anchor being connected to the distal end of the outer sheath core so as to be at least partially inserted into the restraint when the inner sheath core and the outer sheath core are relatively axially moved; the fixing anchor comprising a main body and a plurality of anchor hooks, the outer wall of the main body forming a limiting groove at the proximal end side of each anchor hook; the delivery device of the present application radially compresses the wave pole of the bare stent through the restraint during the relative axial movement of the inner sheath core and the outer sheath core before the bare stent is separated from the anchor hook, so that the wave pole can be re-stored in the limiting groove, thereby driving the main body stent connected to the wave pole to be radially compressed, so as to adjust the shape and position of the covered stent during the release adjustment process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interventional medical devices, and in particular to a delivery device and a delivery system. BACKGROUND

[0002] In an interventional procedure, a delivery device is usually used to deliver an implant such as a stent to a lesion site and release the implant at a predetermined position, and then the delivery device is withdrawn after the implant is anchored at the predetermined position. For example, in an interventional procedure for abdominal aortic aneurysm, a stent is first radially compressed into an outer sheath tube of a delivery device, and then the delivery device loaded with the stent is sent to a lesion site through a proximal end of an aorta, such as a femoral artery incision of a human body, and then the stent is released from the outer sheath tube at a predetermined position. After the stent is completely released, the stent is fully expanded and anchored to a blood vessel wall, and the stent cover can isolate the blood flow from the lesion site to eliminate the impact of the blood flow on the lesion site, and a new blood circulation channel is established through the lumen of the stent. Finally, the sheath core and the outer sheath tube of the delivery device are directly withdrawn, thereby achieving the interventional treatment of the aneurysm and the artery dissection.

[0003] Due to the influence of blood flow pulsation and friction, the position of the stent may change under the influence of blood flow impact during the release of the stent and before the stent is completely released. If the position of the stent changes greatly, it may cause occlusion of the renal artery branch or failure to cover the lesion site, which may threaten the safety of the patient's life. Therefore, it is particularly important to adjust the shape and position of the stent before the stent is completely released. However, in the existing delivery system, the sheath core only hooks the bare stent at the distal end of the stent cover, and then the sheath core and the stent are sleeved in the outer sheath. After the delivery system reaches the predetermined position, the outer sheath is withdrawn, and the end of the stent cover closest to the bare stent is preferentially self-expanded and expanded. Once the end of the stent cover connected to the bare stent is expanded, the existing delivery system cannot adjust the shape and position of the partially expanded stent, which undoubtedly increases the difficulty and risk of the procedure. SUMMARY

[0004] The purpose of the embodiments of the present application is to solve the technical problem that the existing delivery device cannot adjust the shape and position of the stent after the stent cover is released.

[0005] To solve the above technical problems, the embodiments of the present application provide a delivery device, which adopts the following technical solutions:

[0006] The conveyor includes a sheath core assembly, an outer sheath tube, and a conveying handle. The sheath core assembly includes an inner sheath core and an outer sheath core sleeved outside the inner sheath core. The outer sheath tube is sleeved outside the outer sheath core. The proximal ends of the inner sheath core, the outer sheath core, and the outer sheath tube are all connected to the conveying handle. Under the adjustment of the conveying handle, the inner sheath core and the outer sheath core, as well as the outer sheath tube and the sheath core assembly, can move relative to each other in the axial direction.

[0007] The sheath core assembly further includes a sleeve-shaped constraint member and a fixing anchor. The constraint member is sleeved outside the distal end of the inner sheath core and fixed relative to the inner sheath core. The fixing anchor is fixed to the distal end of the outer sheath core. During the axial relative movement between the inner sheath core and the outer sheath core, and between the outer sheath tube and the sheath core assembly, at least a portion of the fixing anchor can be inserted into the constraint member, and the outer sheath tube can be sleeved outside the constraint member.

[0008] The fixed anchor includes a main body with a preset axial length and a plurality of anchor hooks disposed on the outer wall of the main body for hooking the bare bracket of the film-coated bracket. The outer wall of the main body has a limiting groove formed on the proximal side of each of the anchor hooks for receiving the wave rod of the bare bracket.

[0009] Before the fixed anchor is inserted into the constraint member and the bare bracket is disengaged from the anchor hook, the bare bracket can radially compress the wave rod of the bare bracket through the constraint member during the relative axial movement of the inner sheath core and the outer sheath core, so that the wave rod can be re-accommodated in the limiting groove, thereby driving the main bracket connected to the wave rod to be radially compressed.

[0010] In some embodiments of the conveyor of the present invention, the anchor hook extends along the proximal end of the main body toward the distal end and gradually deviates from the outer wall of the main body.

[0011] In some embodiments of the conveyor of the present invention, the outer wall of the main body is recessed with a groove that communicates with the limiting groove and the bottom of the groove is for the anchor hook to protrude. The radial height of the bottom of the groove in the main body is less than the radial height of the bottom of the limiting groove.

[0012] In some embodiments of the conveyor of the present invention, the angle range of the anchor hook deviating from the outer wall of the main body portion during the extension of the anchor hook from the proximal end to the distal end of the main body portion is 70° to 90°.

[0013] And / or, the outer wall of the main body is provided with a limiting rib corresponding to each anchor hook on the proximal side of the anchor hook, and the limiting ribs are circumferentially spaced and located between two limiting grooves corresponding to the same anchor hook;

[0014] And / or, each of the anchor hooks corresponds to two of the limiting grooves, and the two limiting grooves are arranged symmetrically with respect to the center of the corresponding anchor hook;

[0015] And / or, the distal surface of the main body is a guide arc surface, and the angle between the tangent of the guide arc surface and the axis of the main body is an obtuse angle.

[0016] In some embodiments of the conveyor of the present invention, the conveying handle includes a rotary assembly sleeved on the inner sheath core for driving the inner sheath core to move axially; wherein...

[0017] The throttle assembly has a first axial movement distance and a second axial movement distance, the second axial movement distance being greater than the first axial movement distance; within the first axial movement distance range, the fixed anchor is always at least partially inserted into the constraint member, and the constraint member has a radial constraint on the bare bracket hooked on the fixed anchor; within the second axial movement distance range, the constraint member no longer has a radial constraint on the bare bracket hooked on the fixed anchor, and the bare bracket can detach from the anchor hook.

[0018] In some embodiments of the conveyor of the present invention, a limiting step is provided on the outer wall of the main body, the limiting step being used to abut against the proximal end of the constraint member when the insertion section of the fixed anchor is fully inserted into the constraint member.

[0019] In some embodiments of the conveyor of the present invention, the conveying handle further includes a main handle sleeved on the inner sheath core and the outer sheath core, for adjusting the axial movement of the outer sheath tube, and an intermediate connecting member connected to the proximal end of the main handle; the throttle assembly is axially movable and connected to the proximal end of the intermediate connecting member;

[0020] The conveyor further includes a locking member detachably disposed between the intermediate connector and the throttle assembly; when the locking member is located between the intermediate connector and the throttle assembly, the throttle assembly has only a first axial movement distance; after the locking member is removed from between the intermediate connector and the throttle assembly, the throttle assembly has a second axial movement distance.

[0021] In some embodiments of the conveyor of the present invention, the intermediate connector includes a connecting portion connected to the proximal end of the main handle and having a first limiting surface at the proximal end; the rotary handle assembly includes a rotating handle sleeved on the proximal side of the connecting portion and fitted onto the inner sheath core, and an inner slider fixedly sleeved on the inner sheath core and helically connected to the rotating handle inside the rotating handle to drive the inner sheath core to move axially, wherein the maximum axial distance between the distal end face of the inner slider and the first limiting surface is the second axial movement distance;

[0022] The locking member is provided with a second limiting surface. When the locking member is disassembled and fitted onto the connecting part of the intermediate connector, the maximum axial distance between the distal end face of the inner slider and the second limiting surface near the inner slider is the first axial movement distance.

[0023] In some embodiments of the conveyor of the present invention, the intermediate connector further includes a guide rod portion connected to the proximal end of the connector portion, and the throttle assembly further includes a tail end cap sleeved on the proximal side of the throttle handle and disposed on the inner sheath core and the proximal end of the guide rod portion.

[0024] The inner slider is slidably sleeved on the guide rod between the connecting part and the tail end cap;

[0025] Before the bare bracket is disengaged from the anchor hook, the locking member is detachably connected to the guide rod between the connecting part and the rotating handle.

[0026] In some embodiments of the conveyor of the present invention, the locking member includes a locking sleeve with a circumferential opening that is fixedly sleeved on the connecting portion, and a limiting rib protruding from the inner wall of the locking sleeve toward the circumferential opening and having a through hole for the inner sheath core to pass through. When the locking member is sleeved on the connecting portion, the proximal end face of the limiting rib is the second limiting surface.

[0027] When the intermediate connector further includes a guide rod connected to the proximal end of the connecting part, the opposite sides of the limiting rib in the radial direction and the inner wall of the locking sleeve respectively form a first insertion hole and a second insertion hole that are slidably inserted into the guide rod.

[0028] When the throttle assembly further includes a tail cap that is sleeved on the proximal side of the throttle handle and disposed on the proximal end of the guide rod, the proximal end of the throttle handle is sleeved on the distal end of the tail cap, and the distal end is sleeved on the proximal end of the locking sleeve.

[0029] In some embodiments of the conveyor of the present invention, the axial length of the limiting rib is less than the axial length of the locking sleeve, and neither of the two opposite ends of the limiting rib in the axial direction protrudes from the locking sleeve.

[0030] In some embodiments of the conveyor of the present invention, the distal end of the tail cap is provided with a supporting rib protruding towards the inner slider for the proximal end of the rotating handle to be rotatably sleeved.

[0031] And / or, the proximal end of the lock sleeve is recessed with a first transition step, and the distal end of the rotary handle is recessed with a second transition step that mates with the first transition step.

[0032] And / or, the proximal end of the connecting portion of the intermediate connector has a support boss protruding toward the inner slider for the distal end of the rotating handle to be rotatably sleeved.

[0033] To solve the above-mentioned technical problems, this embodiment also provides a conveying system, which adopts the following technical solution: The conveying system includes a film-coated support and the above-described conveyor for loading and releasing the film-coated support. The film-coated support includes a self-expanding main support and a bare support disposed at the distal end of the main support. The bare support at the distal end of the film-coated support can be hooked onto the anchor hook of the fixed anchor. Before the bare support is released from the anchor hook, the bare support can drive the main support of the film-coated support to be radially compressed under the constraint of the constraint member of the conveyor.

[0034] Compared with the prior art, the conveyor and conveying system provided in the embodiments of the present invention have the following main advantages:

[0035] The delivery device of this invention adds a constraint member fixedly sleeved at the distal end of the inner sheath core, and sets multiple anchor hooks on the outer wall of the main body of the fixed anchor connected to the outer sheath core for hooking the bare stent of the covered stent. A limiting groove for receiving the wave rod of the bare stent is formed on the proximal side of each anchor hook. Under the adjustment of the delivery handle, the inner sheath core, outer sheath core and sheath tube move axially relative to each other. When the covered stent is in a semi-released state and before the bare stent is disengaged from the anchor hook, the constraint member moves back and forth within the maximum movable axial stroke range between the fixed anchor and the constraint member to move away from or towards the fixed anchor. This causes the covered stent portion at and near the connection position between the bare stent and the main stent to undergo controllable self-expansion and contraction in the circumferential direction. This adds a semi-release adjustment process before the covered stent is fully released, which is beneficial for the surgeon to adjust the shape and position of the covered stent in a timely manner according to the actual situation of the patient during the operation, thereby improving the success rate of the operation, ensuring the patient's life safety, and also reducing the surgeon's skill requirements. Attached Figure Description

[0036] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention or corresponding prior art. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] in:

[0038] Figure 1 This is a schematic diagram of the planar structure of a conveyor in one embodiment of the present invention; wherein, in this figure, the front end portion of the conveyor is partially sectioned;

[0039] Figure 2 yes Figure 1 Enlarged view of the longitudinal section at point A;

[0040] Figure 3 This is a three-dimensional structural diagram of the sheath core assembly, fixed anchor, and constraint member of the conveyor in one embodiment of the present invention, which are fitted with the inner sheath core and axially separated.

[0041] Figure 4 This is a three-dimensional structural diagram of the conveyor with a bare support hook attached to its fixed anchor in one embodiment of the present invention;

[0042] Figure 5 This is a three-dimensional structural diagram of a conveyor with a bare support fixed anchor inserted into a constraint member, and the near end of the constraint member abutting against the limiting step of the fixed anchor in one embodiment of the present invention.

[0043] Figure 6 This is a front view of the fixed anchor of the conveyor in one embodiment of the present invention;

[0044] Figure 7 yes Figure 6 Plan view of section AA in the middle;

[0045] Figure 8 This is a left view of the fixed anchor of the conveyor in one embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram illustrating the principle of the delivery device's front end advancing along the guide wire entering the blood vessel in one embodiment of the present invention; wherein, this diagram is an illustration of the separated fixed anchor and constraint member before they are inserted together;

[0047] Figure 10 This is a schematic diagram of the fixed anchorage constraint member of the conveyor in one embodiment of the present invention; wherein, in this figure, the constraint member is axially disposed at the end of the sheath core assembly;

[0048] Figure 11 This is a schematic diagram of a planar structure in one embodiment of the present invention, showing a conveyor loading a film-coated support to form a conveying system, an outer sheath releasing part of the main support, a locking member in a locked state, and a bare support having a maximum axial distance that can reciprocate before being released from the anchor hook;

[0049] Figure 12 This is a schematic diagram of a planar structure in one embodiment of the present invention, showing a conveyor loading a film-coated bracket to form a conveying system, an outer sheath tube releasing part of the main bracket, a locking member in a locked state, a bare bracket in a radially constrained state, and an inner sheath core driving the constraining member to move axially a certain distance to the far end.

[0050] Figure 13 This is a planar structural diagram of an embodiment of the present invention, in which the outer sheath of the conveyor and the constraint are inserted into the outer sheath, the rotating handle rotates to drive the inner sheath core to move axially a certain distance to the far end within the range of reciprocating movement, and then the locking part is removed.

[0051] Figure 14 yes Figure 13 A magnified view of the end, constraint, and outer sheath at point B after they have been made transparent.

[0052] Figure 15 yes Figure 13 Enlarged view of the longitudinal section at point C;

[0053] Figure 16 This is a plan view of the conveyor after the disassembly locking member, the constraint member and the end head are separated from the outer sheath tube under the drive of the throttle assembly in one embodiment of the present invention.

[0054] Figure 17 yes Figure 16 A magnified view of the end, constraint, and outer sheath at point D after transparent treatment;

[0055] Figure 18 yes Figure 16 Enlarged view of the longitudinal section at point E after cross-section;

[0056] Figure 19 This is a three-dimensional structural diagram of the conveyor's intermediate connector, locking component, and throttle assembly from one perspective during assembly in one embodiment of the present invention.

[0057] Figure 20 yes Figure 19 3D exploded view of the assembly structure from the same perspective;

[0058] Figure 21 This is a three-dimensional structural diagram of the conveyor's intermediate connecting parts, locking parts, and throttle assembly from another perspective during assembly in one embodiment of the present invention.

[0059] Figure 22 yes Figure 21 A three-dimensional exploded view of the device structure from the same perspective.

[0060] The labels in the attached diagram are as follows:

[0061] 1000, Delivery system; 100, Delivery device; 200, Covered stent; 210, Bare stent; 211, Hook; 212, Wave rod; 220, Main stent; 300, Blood vessel; 400, Guide wire;

[0062] 1. Sheath core assembly; 11. Inner sheath core; 12. Outer sheath core; 13. End; 14. Wire feeding channel; 15. Luer connector;

[0063] 2. Outer sheath; 21. First shaft hole;

[0064] 3. Conveyor handle; 31. Rotary handle assembly; 311. Rotary handle; 3112. Second transition step; 3113. Anti-slip structure; 3114. Internal thread; 312. Internal slider; 3121. External thread; 313. Tail end cap; 3131. Support rib;

[0065] 32. Main handle; 321. Fixed handle; 322. Movable handle; 323. Switch; 324. Screw;

[0066] 33. Intermediate connector; 331. Connecting part; 3311. First limiting surface; 3312. Support boss; 3313. Limiting groove; 332. Guide rod part;

[0067] 4. Constraint component; 41. Constraint shaft hole; 42. First cylindrical section; 43. Second cylindrical section;

[0068] 5. Fixed anchor; 51. Main body; 511. Guide arc surface; 512. Second shaft hole; 513. Guide head; 52. Anchor hook; 53. Limiting groove; 54. Groove; 55. Limiting rib; 551. Limiting step; 552. Insertion section; 553. Abutment section; 554. Transition arc surface; 555. Conical surface;

[0069] 6. Locking element; 61. Second limiting surface; 62. Locking sleeve; 621. Circumferential opening; 622. First transition step; 63. Limiting rib; 631. Through hole; 64. First insertion hole; 65. Second insertion hole. Detailed Implementation

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0071] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0072] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0073] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] It should be noted that in the field of interventional medical devices, "proximal" and "distal" are commonly used terms. "Proximal" refers to the end of the implanted medical device closer to the operator, and "distal" refers to the end farther from the operator. The "proximal" and "distal" ends of any component of a medical device are defined based on this principle. "Axial" generally refers to the length of the medical device during delivery, and "radial" generally refers to the direction perpendicular to its "axial" direction. The "axial" and "radial" ends of any component of a medical device are defined based on this principle. "Middle section" generally refers to the portion of any component of a medical device that distinguishes it from its two ends, and not just the portion located in the exact middle.

[0075] This invention provides a delivery device 100 for delivering an implant into a patient via interventional means. Exemplarily, the implant can be a stent, but it is not limited to this. Overall, the delivery device 100 of this application allows the surgeon to easily adjust the shape of the implant according to the actual situation during implant release, facilitating precise adjustment and release to achieve the optimal implantation state, reducing the demands on the surgeon and lowering the surgical risk for the patient.

[0076] For ease of explanation, the following description will focus on the delivery device 100 of the present invention in conjunction with an implant, wherein the delivery device 100 is loaded with an implant, namely a stent. The loaded stent is self-expanding and includes a main stent 220 and a bare stent 210, the bare stent 210 being disposed at the distal end of the main stent 220. Exemplarily, the bare stent 210 may be formed by splicing multiple wave rods 212 into a ring-shaped wave structure, with hook portions 211 formed at the crests of the bare stent 210, each hook portion 211 having a wave rod 212 connected to both sides. Of course, the bare stent 210 may also employ other suitable structures, which are not particularly limited here.

[0077] likeFigures 1 to 3 As shown, the conveyor 100 includes a sheath core assembly 1, an outer sheath tube 2, and a conveying handle 3. The sheath core assembly 1 includes an inner sheath core assembly and an outer sheath core assembly sleeved on the inner sheath core assembly. The outer sheath tube 2 is sleeved outside the sheath core assembly 1. Specifically, as shown... Figure 1 and Figure 3 As shown, the outer sheath tube 2 has a first shaft hole 21 axially, the sheath core assembly 1 is placed in the first shaft hole 21 of the outer sheath tube 2, and the distal end of the sheath core assembly 1 extends out of the distal end of the outer sheath tube 2.

[0078] Furthermore, the proximal ends of the inner sheath core assembly, outer sheath core assembly, and outer sheath tube 2 are all connected to the delivery handle 3. Under the adjustment of the delivery handle 3, relative axial movement can occur between the inner and outer sheath core assemblies, and between the outer sheath tube 2 and the sheath core assembly 1, so that the loading, release, and adjustment of the stent can be achieved through the cooperation of the inner and outer sheath core assemblies and the outer sheath tube 2. It should be noted that, for ease of passage within the blood vessel 300, the outer sheath tube 2 can be a tough plastic tube. For example, the outer sheath tube 2 can be made of at least one of the following materials: nylon, polyimide, polyurethane, polyester, etc., to give the outer sheath tube 2 high strength and resistance to bending.

[0079] In this embodiment, as Figure 1 and Figure 3 As shown, the inner sheath core assembly includes an inner sheath core 11 and a cylindrical constraint member 4. The cylindrical constraint member 4 is fixed relative to the distal end of the inner sheath core 11. The outer sheath core assembly includes an outer sheath core 12 and a fixing anchor 5. The fixing anchor 5 is fixed relative to the distal end of the outer sheath core 12. The fixing anchor 5 can at least partially insert into and extend out of the constraint member 4 during axial relative movement between the inner and outer sheath core assemblies. The outer sheath tube 2 is sleeved on the outside of the constraint member 4.

[0080] It should be noted that, as Figure 1 and Figure 3 As shown, in order to facilitate the conveyor to form a guide during the conveying process and simultaneously fix the constraint member 4 relative to the distal end of the inner sheath core 11, the inner sheath core assembly also includes an end head 13, wherein the end head 13 is axially provided with a guide wire 400 (see... Figure 9 The wire feed channel 14 passes through the wire feed channel 14; at the position corresponding to the wire feed channel 14, the constraint member 4 is axially provided with a constraint shaft hole 41 communicating with the wire feed channel 14, the distal end of the inner sheath core 11 passes through the constraint shaft hole 41 and is connected to the end 13, and the distal end of the constraint member 4 is connected to the proximal end of the end 13, so that the constraint member 4 and the inner sheath core 11 are relatively fixed, so that the constraint member 4 can move with the movement of the inner sheath core 11.

[0081] Exemplarily, specifically in this embodiment, the constraint member 4 includes a first cylindrical portion 42 and a second cylindrical portion 43 connected to the proximal end of the first cylindrical portion 42. The first cylindrical portion 42 is axially inserted into the proximal end of the end head 13, and the second cylindrical portion 43 is located on the proximal side of the end head 13, positioned within the first axial hole 21 of the outer sheath 2 when the outer sheath 2 is not retracted. When the support needs to be released, retracting (i.e., moving towards the proximal end) the outer sheath 2 causes the second cylindrical portion 43 of the constraint member 4 to axially separate from the outer sheath 2 (see...). Figure 12 As the outer sheath tube 2 continues to move, the covered support 200 expands and unfolds. At this time, the bare support 210 of the covered support 200 is still hooked on the fixing anchor 5 of the sheath core assembly 1, and the distal end of the fixing anchor 5 is still placed inside the constraint member 4. Of course, in other embodiments, the constraint member 4 can also adopt other suitable structures, or can be connected to the end 13 in other suitable ways.

[0082] It should also be noted that, such as Figure 1 As shown, the sheath core assembly 1 also includes a Luer connector 15, which is disposed at the proximal end of the inner sheath core 11 on the proximal side of the delivery handle 3. This Luer connector 15 is used to connect a syringe to flush the inner sheath core 11, or to communicate with the wire feeding channel 14 of the end cap 13 through the inner sheath core 11 for injecting contrast agents into the body. Specifically, the Luer connector 15 can be connected to the proximal end of the inner sheath core 11 by injection molding, adhesive bonding, or threaded connection.

[0083] like Figure 1 As shown, the fixed anchor 5 is connected to the distal end of the outer sheath core 12 so that at least a portion of the fixed anchor 5 can be inserted into the constraint member 4 when the inner sheath core 11 and the outer sheath core 12 move axially relative to each other. Understandably, during the relative axial movement of the inner sheath core 11 and the outer sheath core 12, the constraint member 4 and the fixed anchor 5, which are respectively fixed at the distal ends of the inner sheath core 11 and the outer sheath core 12, will also move axially relative to each other, so as to allow the fixed anchor 5 to at least partially insert into or disengage from the constraint member 4.

[0084] Exemplarily, in a specific embodiment, the outer sheath core 12 can be directly fixedly connected to the conveying handle 3. Thus, within the body, the fixing anchor 5, connected to the distal end of the outer sheath core 12, is also fixed. At least partial insertion or disengagement of the fixing anchor 5 from the constraint member 4 can be achieved simply by axially moving the inner sheath core 11 via the conveying handle 3. Of course, in other embodiments, other suitable structures can be used to achieve relative axial movement between the fixing anchor 5 and the constraint member 4, which will not be elaborated here.

[0085] In this embodiment, as Figure 1 , Figures 3 to 7As shown, the fixing anchor 5 includes a main body 51 and multiple anchor hooks 52. The main body 51 has a preset axial length to enable the fixing anchor 5 and the constraint member 4 to be inserted relative to each other. The fixing anchor 5 has a length that can move back and forth within the constraint member 4. This length is used to re-constrain the bare stent 210 of the covered stent 200, thereby facilitating the surgeon to more flexibly adjust the shape of the stent during the relative axial movement of the fixing anchor 5 and the constraint member 4.

[0086] It should be noted that the main body 51 of the fixed anchor 5 has a second shaft hole 512 axially (see...). Figure 4 The inner sheath core 11 can pass through the second shaft hole 512 and the constraint shaft hole 41 of the constraint member 4 and connect to the end 13. Specifically, in this embodiment, the distal end of the outer sheath core 12, which is sleeved outside the inner sheath core 11, can also be inserted into the second shaft hole 512. Specifically, the distal end of the outer sheath core 12 can be connected to the hole wall of the second shaft hole 512 by injection molding, adhesive bonding, or threaded connection, so as to fix the fixing anchor 5 to the distal end of the outer sheath core 12. Preferably, the distal end face of the outer sheath core 12 is flush with the distal end face of the fixing anchor 5 to protect the inner sheath core 11 passing through the second shaft hole 512 throughout its length.

[0087] like Figure 3 and Figure 4 As shown, multiple anchor hooks 52 are circumferentially spaced on the outer wall of the main body 51 for hooking onto the hook portion 211 of the bare support 210 of the film-coated support 200. On the proximal side of each anchor hook 52, a limiting groove 53 is formed on the outer wall of the main body 51 for accommodating the wave rod 212 of the bare support 210. Exemplarily, each anchor hook 52 generally corresponds one-to-one with the hook portion 211 of the bare support 210, and each hook portion 211 is connected to two wave rods 212; that is, each anchor hook 52 corresponds to two limiting grooves 53.

[0088] Understandably, by hooking the bare support 210 onto the anchor hook 52 and housing the wave rod 212 in the limiting groove 53, on the one hand, the bare support 210 is prevented from tilting up after being hooked onto the anchor hook 52, which facilitates the smooth housing of the bare support 210 and even the coated support 200 into the first shaft hole 21 of the outer sheath tube 2, and reduces the friction between the bare support 210 and the inner wall of the sheath tube 2; on the other hand, it can limit the bare support 210 hooked onto the anchor hook 52, preventing the bare support 210 from easily shaking when the coated support 200 is installed into the outer sheath tube 2, thus preventing damage to the sheath tube 2. At the same time, the wave rods of each bare support 210 are relatively independent, avoiding mutual interference.

[0089] In this embodiment, as Figure 1 , Figure 11 and Figure 12As shown, when the fixed anchor 5 is inserted into the constraint member 4 and before the bare bracket 210 is disengaged from the anchor hook 52, during the relative axial movement of the inner sheath core 11 and the outer sheath core 12, the bare bracket 210 can radially compress the wave rod 212 through the constraint member 4, so that the wave rod 212 of the self-expanded bare bracket 210 can be re-accommodated in the corresponding limiting groove 53, thereby driving the main bracket 220 connected to the wave rod 212 and after self-expansion to be radially compressed.

[0090] As can be understood from the above, when the covered stent 200 is in the body and not released, that is, when neither the main stent 220 nor the bare stent 210 is released, at least the main stent 220 of the covered stent 200, which is sleeved and hooked onto the fixing anchor 5, is housed in the first shaft hole 21 of the outer sheath tube 2, and the distal part of the fixing anchor 5, which hooks onto the bare stent 210, is inserted into the constraint shaft hole 41 of the constraint member 4 in the first shaft hole 21 of the outer sheath tube 2.

[0091] By way of example, the working principle of adjusting the shape of the film-coating support 200 using the conveyor 100 of the present invention is roughly as follows:

[0092] If, while the covered stent 200 is in the body and not yet released, to release the covered stent 200 and adjust its shape, the outer sheath 2 can be moved axially relative to the sheath core assembly by operating the delivery handle 3. For example, the outer sheath 2 can be adjusted to move proximally (see...). Figure 11 This allows the proximal end of the constraint member 4 to disengage from the first shaft hole 21 of the outer sheath tube 2, and the distal end of the main support 220 of the covered stent 200 to expand and unfold. The main support 220 near the proximal end is still radially constrained within the first shaft hole 21 of the outer sheath tube 2, that is, the covered stent 200 is in a semi-released state.

[0093] When the covered support 200 is in a semi-released state, before the bare support 210 disengages from the anchor hook 52, the inner sheath core 11 and the outer sheath core 12 can be moved axially relative to each other by operating the delivery handle 3, for example, by adjusting the inner sheath core 11 to move it distally (see...). Figure 12 This allows the constraint member 4 to gradually move away from the fixed anchor 5, thereby gradually releasing the wave rod 212 contained in the limiting groove 53 at the near end of the anchor hook 52. After being released, the wave rod 212 expands and disengages from the limiting groove 53, and the main support 220 connected to the wave rod 212 will also expand and gradually unfold along with the self-expanding wave rod 212.

[0094] Alternatively, after the wave rod 212 expands, the inner sheath core 11 is adjusted to move towards the proximal end so that the constraint member 4 gradually approaches the fixed anchor 5 and tightens the wave rod 212 again. That is, the wave rod 212 of the bare bracket 210 after self-expansion is re-accommodated in the corresponding limiting groove 53 by the constraint member 4, and the self-expansion main bracket 220 connected to the wave rod 212 will also be radially compressed again along with the wave rod 212.

[0095] Thus, before the main support 220 of the covered support 200 is fully released, the fixing anchor 5 is inserted with the constraint member 4, and before the bare support 210 is disengaged from the anchor hook 52, there is a maximum movable axial travel L1 between the fixing anchor 5 and the constraint member 4 (see...). Figure 1 and Figure 6 During this stroke, the constraint member 4 can reciprocate to allow the portion of the covered bracket 200 located at and near the connection point between the bare bracket 210 and the main bracket 220 to undergo controllable self-expansion and contraction in the circumferential direction. This allows for shape adjustment of the covered bracket 200 when it is in a semi-released state. In other words, before the covered bracket 200 is fully released, it is released and adjusted. Once the covered bracket 200 is adjusted to a suitable shape and the current optimal position, the inner sheath core 11 can be adjusted by the conveying handle 3 to move it further to the distal end until the constraint member 4 exits the aforementioned maximum movable axial stroke range. This releases the radial constraint effect of the constraint member 4 on the bare bracket 210, allowing the bare bracket 210 to detach from the anchor hook 52 and self-expand.

[0096] It should be noted that after the bare bracket 210 is fully extended from the anchor hook 52, the fixed anchor 5 can still be partially inserted into the constraint shaft hole 41 of the constraint member 4, or it can be completely removed from the constraint shaft hole 41 of the constraint member 4.

[0097] In summary, compared with the prior art, the conveyor 100 has at least the following beneficial effects:

[0098] The conveyor 100 adds a constraint 4 fixedly fitted to the inner sheath core 11, and provides multiple anchor hooks 52 on the outer wall of the main body 51 of the fixed anchor 5 connected to the outer sheath core 12 for hooking the bare bracket 210 of the film-coated bracket 200. A limiting groove 53 for receiving the wave rod 212 of the bare bracket 210 is formed on the proximal side of each anchor hook 52. Under the adjustment of the conveyor handle 3, the inner sheath core 11, outer sheath core 12 and outer sheath tube 2 move axially relative to each other. Before the film-coated bracket 200 is in a semi-released state and the bare bracket 210 is disengaged from the anchor hook 52, the fixed anchor 5 and the constraint are in place. Within the maximum movable axial travel range between the components 4, the constraint component 4 reciprocates to move away from or towards the fixed anchor 5, thereby causing the portion of the covered stent 200 located at and near the connection position of the bare stent 210 and the main stent 220 to undergo controllable self-expansion and contraction in the circumferential direction. This adds a semi-release adjustment process before the covered stent 200 is fully released, which allows the surgeon to adjust the shape and position of the covered stent 200 in a timely manner according to the patient's actual condition during the operation, thereby improving the success rate of the operation, ensuring the patient's life safety, and also reducing the surgeon's skill requirements.

[0099] To enable those skilled in the art to better understand the present invention, the following will be described in conjunction with the appendix. Figures 1 to 22The technical solutions in the embodiments of the present invention will be clearly and completely described.

[0100] In some embodiments of the present invention, such as Figure 1 , Figure 3 and Figure 7 As shown, the distal end of the anchor hook 52 extends from the proximal end of the main body 51 toward the distal end and gradually deviates from the outer wall of the main body 51 of the fixed anchor 5, so that the anchor hook 52 is tilted toward the distal end of the fixed anchor 5. This makes it easy for the hook portion 211 of the bare bracket 210 to not only be stably hooked on the anchor hook 52 and not easily fall off, but also to not affect the bare bracket 210 from detaching from the anchor hook 52 and self-expanding during the complete release process.

[0101] Preferably, such as Figure 7 As shown, when the anchor hook 52 tilts from the proximal end to the distal end of the main body 51, the tilt angle α of the anchor hook 52 is 70° to 90°. That is, the anchor hook 52 tilts slightly towards the distal end relative to the main body 51, so that while ensuring that the bare bracket 210 is stably hooked to the anchor hook 52, it can be more smoothly released from the anchor hook 52 during the complete release process.

[0102] It should be noted that the main body 51 of the fixing anchor 5 can be a columnar body with the same or different diameters at different shaft sections. Specifically, in this embodiment, six anchor hooks 52 are provided, and the six anchor hooks 52 are evenly arranged circumferentially around the central axis of the main body 51. Of course, in other embodiments, the number of anchor hooks 52 is not limited to six; the specific number can be determined according to the number of hook portions 211 of the bare bracket 210 of the loaded film-coated bracket 200.

[0103] It should also be noted that, in order to prevent the anchor hook 52 from rubbing against the constraint 4 when the fixing anchor 5 is inserted with the constraint 4, and to prevent the anchor hook 52 from rubbing against the blood vessel 300, the covered stent 200, the outer sheath 2, etc., when the fixing anchor 5 is retracted from the inside of the covered stent 200 after the covered stent 200 is fully released, the corresponding position of the anchor hook 52 is provided with rounded corners or bevels so that the anchor hook 52 can make smooth contact with other components and reduce friction.

[0104] In some embodiments of the present invention, such as Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, a groove 54 is recessed on the outer wall of the main body 51 of the fixed anchor 5. In the fixed anchor 5, the groove 54 communicates with the limiting groove 53, and the bottom of the groove provides for the protrusion of the anchor hook 52. The radial height of the bottom of the groove 54 in the main body 51 is less than the radial height of the bottom of the limiting groove 53.

[0105] In this way, by setting the proximal end of the anchor hook 52 on the bottom of the groove 54, where the radial height is less than the radial height of the bottom of the limiting groove 53, it can better conform to the shape of the bare bracket 210 after radial compression, making it easier for the wave rods 212 of the bare bracket 210 to be completely housed in the limiting groove 53. Specifically, since the hook part 211 of the bare bracket 210 is hooked on the anchor hook 52 set on the bottom of the groove 54, which has a smaller radial height, it will not only be subjected to the radial compression of the constraint member 4, but also to the radial traction force caused by the radial height difference between the distal and proximal ends of the bare bracket 210. Therefore, it is beneficial to increase the radial compression force on the distal end of the bare bracket 210, and also conform to the deformation trend of each wave rod 212 gradually approaching from the proximal end to the distal end when the bare bracket 210 is subjected to radial compression, further enhancing the overall radial compression effect of the covered bracket 200.

[0106] On the other hand, it is beneficial to reduce the diameter of the outer sheath tube 2, thereby achieving a miniaturized design of the conveyor 100. Specifically, since the proximal end of the anchor hook 52 is located in the groove 54 with a lower radial height, the radial height of the top of the anchor hook 52 of the same length on its longitudinal section is also reduced, so that a restraint member 4 with a smaller inner diameter and an outer sheath tube 2 can be used to load and release the membrane support 200.

[0107] Preferably, the radial height of the bottom of the limiting groove 53 of the fixed anchor 5 can gradually decrease from the proximal end to the distal end. That is, the bottom of the limiting groove 53 gradually tilts towards the distal end of the fixed anchor 5 to further conform to the radially compressed shape of the wave rod 212 of the bare stent 210. This allows the wave rod 212 to be quickly housed in the limiting groove 53 with a small axial movement between the constraint member 4 and the fixed anchor 5, which is beneficial to improving the efficiency of the surgeon in adjusting the shape and position of the covered stent 200.

[0108] And / or, in some embodiments of the invention, such as Figures 3 to 7 As shown, on the proximal side of the anchor hook 52, the outer wall of the main body 51 of the fixed anchor 5 is provided with limiting ribs 55 corresponding to each anchor hook 52. The limiting ribs 55 are circumferentially spaced and located between two limiting grooves 53 corresponding to the same anchor hook 52, so that the two wave rods 212 corresponding to the same hook part 211 are independently and stably maintained in a radially compressed state without affecting each other. Additionally, limiting ribs 55 are also provided between two adjacent limiting grooves 53.

[0109] It should be noted that, to avoid rubbing between the limiting rib 55 and the blood vessel 300, the covered stent 200, the outer sheath 2, the restraint member 4, etc., and to prevent the fixing anchor 5 from getting stuck during forward or backward movement, the corresponding parts of the limiting rib 55 adopt a smooth transition structure. For example, such as... Figure 3 , Figure 6 and Figure 7As shown, the proximal outer surface of the limiting rib 55 is set as a conical surface 555 to form a conical cylinder structure; the distal outer surface of the limiting rib 55 is set as a transition arc surface 554.

[0110] And / or, in some embodiments of the invention, such as Figure 3 and Figure 6 As shown, each anchor hook 52 corresponds to two limiting grooves 53, and these two limiting grooves 53 are arranged symmetrically with respect to the center of the corresponding anchor hook 52, so that when the film-covered support 200 is in the retracted state, the crest of the bare support 210 can be hooked onto the anchor hook 52. Similarly, the wave rods 212 on both sides of the crest can be accommodated in the corresponding limiting grooves 53. In addition, a limiting rib 55 is also provided between two adjacent limiting grooves 53. It can be understood that the limiting rib 55 is axially opposite to an anchor hook 52.

[0111] For example, specifically in this embodiment, such as Figure 8 As shown, there are 6 anchor hooks 52, which are evenly arranged around the central axis of the main body 51. Each anchor hook 52 corresponds to two limiting grooves 53, that is, the main body 51 that fixes the anchor 5 is provided with a total of 12 limiting grooves 53, so as to accommodate the 12 wave rods 212 that form the wave-shaped bare bracket 210.

[0112] And / or, in some embodiments of the invention, such as Figure 3 , Figure 6 and Figure 7 As shown, the distal end face of the main body 51 of the fixed anchor 5 is a guide arc surface 511, and the distal end of the main body 51 can serve as the guide head 513 of the fixed anchor 5, for example, as Figure 9 As shown, in scenarios such as the delivery device 100 bending forward within the blood vessel 300, and the delivery device 100 releasing and adjusting the covered stent 200, the fixed anchor 5 can be quickly guided to align and connect with the constraint member 4 through the transition contact between the guide head 513 and the constraint member 4.

[0113] Preferably, such as Figure 7 As shown, the angle β between the tangent of the guide arc surface 511 and the central axis of the fixed anchor 5 is obtuse. Similarly, as... Figure 10 As shown, the angle β between the tangent of the guide arc surface 511 and the inner wall surface of the constraint member 4 is an obtuse angle, so that when the fixed anchor 5 moves around the central axis of the inner sheath core 11, the fixed anchor 5 can slide more easily into the constraint member 4 through the contact between the guide head 513 and the constraint member 4, preventing the fixed anchor 5 from getting stuck with the edge of the constraint member 4 when it moves back and forth.

[0114] For example, the guide arc surface 511 is preferably a hemispherical surface, and the maximum outer diameter of the guide head 513 is smaller than the inner diameter of the constraint member 4, so that the fixed anchor 5 can flexibly adjust its direction within the constraint member 4.

[0115] It should be noted that, specifically in this embodiment, as... Figure 7 and Figure 8 As shown, in order to ensure that the fixed anchor 5 and the constraint member 4 can be smoothly inserted and that the bare bracket 210 is stably hooked on the anchor hook 52, the maximum outer diameter of the anchor hook 52 is greater than the maximum outer diameter of the guide head 513. That is, in the left view of the fixed anchor 5, the anchor hook 52 protrudes from the guide head 513.

[0116] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the conveying handle 3 includes a throttle assembly 31, which is sleeved on the inner sheath core 11 and is mainly used to drive the inner sheath core 11 to move axially. The throttle assembly 31 has a first axial movement distance L4 and a second axial movement distance L3, the second axial movement distance L3 being greater than the first axial movement distance L4. Within the first axial movement distance L4, the fixed anchor is always at least partially inserted into the constraint member, and the constraint member provides radial constraint on the bare bracket hooked on the fixed anchor. Within the second axial movement distance L4, the constraint member no longer provides radial constraint on the bare bracket hooked on the fixed anchor, and the bare bracket can detach from the anchor hook.

[0117] Specifically, when the anchor hook 52 is inserted into the constraint shaft hole 41 of the constraint member 4, and before the bare bracket 210 disengages from the anchor hook 52, the throttle assembly 31 drives the inner sheath core 11 so that the maximum axial distance that the anchor hook 52 can reciprocate within the constraint member 4 is less than the maximum axial distance L1 between the proximal end of the constraint member 4 and the anchor hook 52 within the constraint member 4. That is, when the covered bracket 200 is in a semi-released release adjustment state, during the process of the throttle assembly 31 driving the inner sheath core 11 to move axially, the anchor hook 52 needs to move within its reciprocating stroke to ensure that the distal end of the bare bracket 210 always receives radial constraint force from the constraint member 4 during the release adjustment process.

[0118] In addition, such as Figure 1 As shown, in scenarios where the covered support 200 needs to be completely released, the maximum axial distance by which the throttle assembly 31 moves the inner sheath core 11 to disengage the fixed anchor 5 from the constraint member 4 is greater than the maximum axial distance L2 between the proximal end of the constraint member 4 and the distal end of the fixed anchor 5 within the constraint member 4. Understandably, to achieve complete disengagement of the fixed anchor 5 from the constraint member 4, the maximum axial distance by which the throttle assembly 31 moves the inner sheath core 11 must be greater than the maximum length L2 of the fixed anchor 5 retracting into the constraint member 4.

[0119] To achieve the above functions, the throttle assembly 31 can adopt an existing structure or a newly created structure, and no particular limitation is made here.

[0120] In some embodiments of the present invention, or in other embodiments, such as Figure 1 , Figure 2 ,Figures 19 to 22 As shown, the conveyor 100 also includes a locking member 6 sleeved on the inner sheath core 11. The locking member 6 is detachably disposed between the intermediate connector and the throttle assembly. When the locking member is located between the intermediate connector and the throttle assembly, the throttle assembly has only a first axial movement distance L4. After the locking member is removed from between the intermediate connector and the throttle assembly, the throttle assembly has a second axial movement distance L3. The locking member 6 is mainly used to restrict the throttle assembly 31 when the fixed anchor 5 is retracted into the constraint member 4, to prevent the throttle assembly 31 from driving the inner sheath core 11 and causing the bare support 210 to disengage from the anchor hook 52. Understandably, before the film-coated support 200 is adjusted to the appropriate position, the locking member 6 can keep the bare support 210 in a semi-released state, avoiding premature release of the bare support 210 due to misoperation, ensuring that the distal end of the bare support 210 always has radial constraint force from the constraint member 4, thereby facilitating the adjustment of the position and shape of the film-coated support 200.

[0121] For example, such as Figure 11 and Figure 12 As shown, the locking element 6 is detachably mounted on the distal end of the throttle assembly 31. When the throttle assembly 31 drives the inner sheath core 11 axially forward, it restricts the further forward movement of the inner sheath core 11. In other words, the locking element 6 directly provides axial physical restraint, limiting the forward movement distance of the constraint element 4 connected to the inner sheath core 11, thus ensuring that the anchor hook 52 remains within the reciprocating stroke range of the constraint element 4. After removing the locking element 6, once the constraint element 4 moves forward to the distal end of the anchor hook 52 of the fixed anchor 5, the bare bracket 210 will no longer be subject to the radial restraint force of the constraint element 4 and will detach from the anchor hook 52 and fully expand.

[0122] In some embodiments of the present invention, such as Figure 1 , Figures 3 to 7 As shown, a limiting step 551 is formed on the outer wall of the main body 51 of the fixed anchor 5. When there is the maximum axial distance between the near end of the constraint member 4 and the anchor hook 52, that is, when the length of the fixed anchor 5 retracted into the constraint member 4 is the longest, the limiting step 551 is mainly used to axially abut against the near end of the constraint member 4.

[0123] Understandably, such as Figure 1 and Figure 6 As shown, when the proximal end of the constraint member 4 abuts axially against the limiting step 551 of the fixed anchor 5, the maximum axial distance L2 between the proximal end of the constraint member 4 and the distal end of the fixed anchor 5 inside the constraint member 4 is the length of the fixed anchor 5 retracted into the constraint member 4, which is also the axial distance L2 between the limiting step 551 and the distal end of the fixed anchor 5; the maximum axial distance L1 between the proximal end of the constraint member 4 and the anchor hook 52 inside the constraint member 4 is the stroke of the anchor hook 52 of the fixed anchor 5 inside the constraint member 4, which is also the axial distance L1 between the limiting step 551 and the distal end of the anchor hook 52 of the fixed anchor 5.

[0124] In short, the range of positional and morphological adjustments that the covered stent 200 can achieve within the body through radial constraint depends on the stroke of the constraint member 4. For example, when the delivery unit 100 has a locking member 6 and a limiting step 551 is provided on the fixed anchor 5, the forward movement distance of the constraint member 4 is limited by the locking member 6, and the backward movement distance is limited by the limiting step 551. Thus, the naked stent 210 can be kept in a radially constrained state by the locking member 6 and the limiting step 551.

[0125] Specifically, such as Figure 11 As shown, when the covered stent 200 is in a semi-released release and adjustment state, and the constraint member 4 abuts against the limiting step 551 of the fixed anchor 5, that is, when the anchor hook 52 and the constraint member 4 have the maximum axial distance for reciprocating movement, the bare stent 210 is radially constrained by the constraint member 4, and the main stent 220 connected to the wave rod 212 of the bare stent 210 is also radially constrained, causing its diameter to become smaller, and it cannot fully expand and fit against the wall of the blood vessel 300, thereby facilitating the adjustment of the position and shape of the covered stent 200.

[0126] like Figure 12 As shown, by limiting the locking member 6, under the drive of the throttle assembly 31, the constraint member 4 connected to the inner sheath core 11 moves forward a certain distance within the reciprocating stroke range. That is, after the proximal end of the constraint member 4 moves away from the limiting step 551, the wave rod 212 of the bare bracket 210, which was partially radially compressed by the constraint member 4, is released, expands and disengages from the limiting groove 53. At this time, the main bracket 220 connected to the wave rod 212 will also expand and increase in diameter.

[0127] Thus, within the movable stroke range defined by the locking member 6 and the limiting step 551, the restraint member 4 can be moved forward or backward by controlling the twisting handle assembly 31, so that the covered stent 200 in the semi-released state can adjust the unfolding diameter within the blood vessel 300. This allows the surgeon to adjust the circumferential rotation or forward and backward movement of the covered stent 200 outside the body by using the delivery handle 3, so as to adjust it to the optimal implantation position according to the patient's actual situation.

[0128] For example, specifically in this embodiment, such as Figure 1 , Figures 4 to 8 As shown, the limiting step 551 is axially recessed on the limiting rib 55 of the fixed anchor 5, so that the limiting rib 55 includes an insertion section 552 and an abutment section 553. Specifically, the radial height of the insertion section 552 is less than the radial height of the distal end of the abutment section 553, thereby forming the aforementioned limiting step 551 at the connection between the insertion section 552 and the abutment section 553.

[0129] It should be noted that the outer diameter of the insertion section 552 of the limiting rib 55 is equal to or slightly smaller than the inner diameter of the proximal end of the constraint member 4, so that the insertion section 552 can smoothly slide into or out of the constraint member 4. Correspondingly, the outer diameter of the distal end of the abutment section 553 is larger than the inner diameter of the proximal end of the constraint member 4, so that the proximal end of the constraint member 4 abuts against the distal end surface of the abutment section 553. Preferably, the height of the limiting step 551 is the same as the wall thickness of the constraint member 4, so that the outer wall of the abutment section 553 is flush with the outer wall of the constraint member 4, which facilitates smooth docking between the two.

[0130] And / or, in some embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 11 and Figure 12 As shown, the conveying handle 3 specifically includes a main handle 32 and an intermediate connector 33. The main handle 32 is sleeved on the inner sheath core 11, the outer sheath core 12, and the outer sheath tube 2, and is mainly used to adjust the axial movement of the outer sheath tube 2. The intermediate connector 33 is sleeved on the inner sheath core 11 at the proximal end of the main handle 32, and cooperates with the throttle assembly 31 at the distal end of the throttle assembly 31 to define the maximum axial distance that the inner sheath core 11 can move so that the fixed anchor 5 can exit the constraint member 4.

[0131] Understandably, the intermediate connector 33 is axially located between the main handle 32 and the throttle assembly 31. After the locking member 6 is removed or when the locking member 6 is not present, the throttle assembly 31 can move from its initial position to axially abut against the intermediate connector 33. The intermediate connector 33 restricts the throttle assembly 31 from further moving the inner sheath core 11 forward, thereby ensuring that the fixed anchor 5 can be completely removed from the constraint member 4.

[0132] Additionally, when the conveyor 100 also includes the locking member 6, and before the bare support 210 disengages from the anchor hook 52, exemplarily, when the film-coated support 200 is in a semi-released release adjustment state, the locking member 6 is detachably clamped onto the intermediate connector 33 at the distal end of the throttle assembly 31. This, together with the locking member 6 and the limiting step 551, limits the reciprocating travel range of the constraint member 4 when radially constraining the bare support 210. Furthermore, after the locking member 6 is removed, the intermediate connector 33 limits the maximum axial distance L3 of the constraint member 4's forward movement (see...). Figure 2 ).

[0133] For example, specifically in this embodiment, such as Figure 1 , Figure 2 , Figure 11 and Figure 12As shown, the main handle 32 includes a screw 324, a fixed handle 321, a movable handle 322, and a switch 323. The screw 324, fixed handle 321, and movable handle 322 are all fitted onto the inner sheath core 11, outer sheath core 12, and outer sheath tube 2. The fixed handle 321 is fixedly fitted onto the distal end of the screw 324, allowing the operator to grip the conveyor handle 3. The movable handle 322 is movably fitted onto the screw 324 near the proximal end of the fixed handle 321 and is connected to the outer sheath tube 2. Under the control of the switch 323, the movable handle 322 can move linearly back and forth relative to the screw 324, or it can be threaded onto the screw 324 to rotate relative to it, thereby causing the outer sheath tube 2 to move axially back and forth relative to the inner sheath core 11 and outer sheath core 12. Additionally, an intermediate connecting member 33 is axially connected to the proximal end of the screw 324, and a locking member 6 is detachably connected to the distal end of the throttle assembly 31.

[0134] Further exemplarily, during the procedure, after the guidewire 400 is inserted into the blood vessel 300, the front half of the delivery device 100 loaded with the covered stent 200, specifically the portion located distal to the fixation handle 321, can be directly inserted into the blood vessel 300 along the guidewire 400. The covered stent 200 is then delivered to the lesion site based on the location of the imaging point of the covered stent 200 in the CT image. Figure 11 As shown, hold the fixed handle 321, rotate the movable handle 322 or turn on the switch 323 and drag the movable handle 322 to move the movable handle 322 backward relative to the fixed handle 321 to drive the outer sheath tube 2 to retract, so as to release part of the main support 220 of the film-coated support 200. At this time, the proximal end of the constraint member 4 can abut against the limiting step 551 of the limiting rib 55, the insertion section 552 of the limiting rib 55 is completely retracted into the constraint member 4, and the abutment section 553 is exposed outside the constraint member 4.

[0135] Based on this, such as Figure 12 As shown, the throttle assembly 31 is then adjusted to move the constraint member 4 connected to the inner sheath core 11 forward, so that at least part of the fixed anchor 5 corresponding to the insertion section 552 of the limiting rib 55 is withdrawn from the constraint member 4, that is, the proximal end of the constraint member 4 is in the middle position of the fixed anchor 5, thereby releasing more of the main support 220, and allowing the released main support 220 to further expand and unfold, and under the restriction of the locking member 6, the anchor hook 52 of the fixed anchor 5 is always retracted into the constraint member 4.

[0136] After the film-coated bracket 200 is adjusted to the target position, the locking part 6 can be removed, and the throttle assembly 31 can be moved forward to quickly move the constraint part 4 to the far end of the anchor hook 52 of the fixed anchor 5, thereby quickly releasing the bare bracket 210.

[0137] It should be noted that after the covered stent 200 is adjusted to the target position, the bare stent 210 can be completely released first, followed by the complete release of the remaining main stent 220 inside the outer sheath 2, or the remaining main stent 220 inside the outer sheath 2 can be completely released first, followed by the complete release of the bare stent 210. The specific method depends on the specific structure of the covered stent 200 and the operator's operating habits.

[0138] In some embodiments of the present invention, the following scheme can be adopted to adjust the inner sheath core 11 by means of the throttle assembly 31 to drive the constraint member 4 to move back and forth:

[0139] like Figure 2 , Figures 13 to 18 As shown, the intermediate connector 33 includes a connecting portion 331 with a first limiting surface 3311 at its proximal end, and the distal end of the connecting portion 331 is connected to the proximal end of the main handle 32 (specifically, the proximal end of the screw 324 of the main handle 32). In addition, to realize the function of adjusting the forward and backward movement of the inner sheath core 11 of the throttle assembly 31, the throttle assembly 31 includes a rotating handle 311 and an inner slider 312. The rotating handle 311 is sleeved on the proximal end of the connecting portion 331 onto the inner sheath core 11, and the inner slider 312 is fixedly sleeved on the inner sheath core 11 and is helically connected to the rotating handle 311 inside the rotating handle 311 to drive the inner sheath core 11 to move axially.

[0140] For example, the inner slider 312 can be fixedly sleeved to the outer wall of the inner sheath core 11 by glue or other connection methods. The rotating handle 311 is provided with an anti-slip structure 3113, such as anti-slip textures or anti-slip protrusions. The rotating handle 311 has an internal thread 3114, and the outer wall of the inner slider 312 has an external thread 3121 adapted to the threaded engagement of the internal thread 3114. The axial length of the internal thread 3114 is greater than the axial length of the inner sheath core 11. By rotating the rotating handle 311, the inner slider 312 can drive the connected inner sheath core 11 to move axially back and forth through the threaded engagement of the internal thread 3114 and the external thread 3121. Understandably, the travel distance of the inner slider 312 itself is the travel distance of the constraint member 4.

[0141] For example Figure 2 As shown, the maximum axial distance L3 between the distal end face of the inner slider 312 and the first limiting surface 3311 of the connecting part 331 is the maximum movable axial distance of the inner sheath core 11 that allows the fixed anchor 5 to retract from the constraint member 4, i.e., the second axial movement distance. In other words, during the movement of the inner slider 312, when the distal end face of the inner slider 312 abuts against the first limiting surface 3311 of the connecting part 331, the fixed anchor 5 should have been completely withdrawn from the constraint member 4.

[0142] In addition, such as Figure 2 As shown, the locking member 6 is provided with a second limiting surface 61 (see figure). Figure 20 orFigure 22 When the locking member 6 is disassembled and fitted into the connecting part 331 of the intermediate connecting member 33, the maximum axial distance L4 (i.e., the first axial movement distance) between the distal end face of the inner slider 312 and the second limiting surface 61 near the inner slider 312 is less than the maximum axial distance that the inner slider 312 can drive the inner sheath core 11 to reciprocate within the constraint member 4. In other words, when the covered bracket 200 is in the semi-released release adjustment state, if the distal end face of the inner slider 312 abuts against the second limiting surface 61 of the locking member 6 during the process of rotating the rotating handle 311 to move the constraint member 4 forward by moving the inner slider 312, the constraint member 4 cannot continue to move forward, so as to prevent the bare bracket 210 from being released prematurely.

[0143] The maximum axial distance between the distal end face of the inner slider and the first limiting surface is the second axial movement distance L3; when the locking member is disassembled and sleeved at the connection part of the intermediate connector, the maximum axial distance between the distal end face of the inner slider and the second limiting surface near the inner slider is the first axial movement distance L4.

[0144] For example, the working principle of the throttle component 31 is roughly as follows:

[0145] Without disassembling the locking member 6, rotating the rotary handle 311 allows the inner slider 312 to move back and forth within the rotary handle 311. This allows the constraint member 4 to reciprocate axially within a safe travel range via the inner sheath core 11. The shape and position of the membrane support 200 are adjusted through the insertion and engagement of the fixed anchor 5 and the constraint member 4. When the inner slider 312 moves within the rotary handle 311, its distal end can be located within the rotary handle 311 or extend beyond it. If the distal end of the inner slider 312 extends to abut against the second limiting surface 61 of the locking member 6, the inner slider 312 will be unable to move forward further. Thus, the safe travel range of the constraint member 4 is defined by the second limiting surface 61 of the locking member 6.

[0146] When the film-coated support 200 is adjusted to the target position, such as Figures 13 to 15 As shown, the distal end face of the inner slider 312 may not reach the second limiting surface 61 of the locking member 6, but it may move forward at least a certain distance; alternatively, it may move forward directly until it abuts against the second limiting surface 61. Figures 16 to 18 As shown, after removing the locking piece 6, the rotating handle 311 and the inner slider 312 can move forward synchronously until the rotating handle 311 abuts against the connecting part 331 of the intermediate connecting piece 33, thereby quickly releasing the film-coated bracket 200. At this time, the fixing cap may be completely removed from the constraint piece 4, or it may still be partially retracted into the constraint piece 4.

[0147] When the rotating handle 311 abuts against the connecting part 331 of the intermediate connecting member 33, if there is still a gap between the far end face of the inner slider 312 and the connecting part 331, the rotating handle 311 can be rotated further to make the inner slider 312 continue to move forward until the far end face of the inner slider 312 abuts against the first limiting surface 3311 of the connecting part 331. At this time, the fixing cap should be able to be completely removed from the constraint member 4.

[0148] In some embodiments of the present invention, such as Figures 19 to 22 As shown, in order to improve the structural stability of the throttle assembly 31, the intermediate connector 33 also includes a guide rod portion 332 connected to the proximal end of the connecting portion 331. The throttle assembly 31 also includes a tail cap 313, wherein the tail cap 313 is sleeved on the inner sheath core 11 on the proximal side of the rotating handle 311 and is disposed on the proximal end of the guide rod portion 332; the inner slider 312 is slidably sleeved on the guide rod portion 332 between the connecting portion 331 and the tail cap 313.

[0149] It should be noted that the rotating handle 311 and the inner slider 312 are located between the connecting part 331 of the intermediate connector 33 and the tail cover 313, and can slide between the two. The tail cover 313 can be connected to the guide rod part 332 by means of threaded connection, snap-fit ​​connection, adhesive connection, etc.

[0150] Additionally, before the bare bracket 210 disengages from the anchor hook 52, the locking member 6 is detachably connected to the guide rod portion 332 between the connecting portion 331 and the rotating handle 311.

[0151] In some embodiments of the present invention, such as Figures 19 to 22 As shown, in order to realize the limiting function of the locking member 6 and the detachable connection with the intermediate connecting part 331, the locking member 6 includes a locking sleeve 62 and a limiting rib 63. The locking sleeve 62 has a circumferential opening 621 and is fixedly sleeved on the connecting part 331. The limiting rib 63 protrudes from the inner wall of the locking sleeve 62 toward the circumferential opening 621 and has a through hole 631 for the inner sheath core 11 to pass through.

[0152] In addition, such as Figure 2 As shown, when the locking member 6 is fitted onto the connecting part 331, the proximal end face of the limiting rib 63 is the aforementioned second limiting surface 61. That is, when the distal end face of the inner slider 312 abuts against the proximal end face of the limiting rib 63, the locking member 6 can restrict the inner slider 312 from continuing to move forward. Of course, the distal end face of the limiting rib 63 can also be set as the second limiting surface 61 to facilitate the interchange of the two ends of the locking member 6.

[0153] like Figure 20 and Figure 22As shown, when the intermediate connector 33 further includes a guide rod portion 332 connected to the proximal end of the connecting portion 331, the opposite sides of the limiting rib 63 in the radial direction and the inner wall of the locking sleeve 62 respectively form a first insertion hole 64 and a second insertion hole 65. Exemplarily, two guide rod portions 332 are provided, and the first insertion hole 64 and the second insertion hole 65 can be slidably inserted into the two guide rod portions 332 respectively.

[0154] When the throttle assembly 31 also includes a tail cap 313 that is sleeved on the proximal side of the rotary handle 311 and disposed on the proximal end of the guide rod portion 332, the proximal end of the rotary handle 311 is sleeved on the distal end of the tail cap 313, and the distal end is sleeved on the proximal end of the locking sleeve 62.

[0155] For example, the locking sleeve 62 has a C-shaped structure and may be made of a material with elastic deformation capabilities, such as plastic. Understandably, the locking sleeve 62 can be elastically deformed and snapped onto the connecting portion 331 of the intermediate connector 33.

[0156] In some embodiments of the present invention, such as Figure 20 and Figure 22 As shown, the axial length of the limiting rib 63 is less than the axial length of the locking sleeve 62, and neither of the two opposite ends of the limiting rib 63 in the axial direction protrudes from the locking sleeve 62. This allows for the use of a shorter locking member 6 to provide a longer axial adjustment stroke, which is beneficial for shortening the overall length of the conveyor 100.

[0157] In some embodiments of the present invention, such as Figures 19 to 22 As shown, the distal end of the tail cap 313 has a supporting rib 3131 protruding from the inward sliding block 312. The supporting rib 3131 is mainly used for the proximal end of the rotary handle 311 to be rotatably fitted. For example, the proximal end of the rotary handle 311 is fitted onto the supporting rib 3131 and can rotate relative to the supporting rib 3131. The supporting rib 3131 can also support the rotary handle 311 from the inside to improve its rotational stability and smoothness.

[0158] And / or, in some embodiments of the present invention, such as Figures 19 to 22 As shown, when the locking member 6 is provided, the proximal end of the locking sleeve 62 of the locking member 6 is recessed with a first transition step 622, and the distal end of the rotating handle 311 is recessed with a second transition step 3112. The proximal end of the locking sleeve 62 is rotatably engaged with the distal end of the rotating handle 311 through the interlocking of the first transition step 622 and the second transition step 3112. Preferably, both the proximal and distal ends of the locking sleeve 62 are recessed with the first transition step 622, so that the locking sleeve 62 can be fitted onto the rotating handle 311 in both directions.

[0159] And / or, in some embodiments of the present invention, such as Figures 19 to 22As shown, the proximal end of the connecting portion 331 of the intermediate connector 33 has a supporting boss 3312 protruding from the inward sliding block 312. The supporting boss 3312 is mainly used for the distal end of the rotating handle 311 to be rotatably fitted. For example, as... Figure 18 As shown, when the locking piece 6, rotating handle 311, and inner slider 312 are removed and moved forward together, the distal end of the rotating handle 311 can be directly sleeved onto the support boss 3312 to rotatably connect to the intermediate connecting piece 33. Preferably, as shown... Figure 21 and Figure 22 As shown, the supporting boss 3312 is axially recessed with a limiting groove 3313, wherein the bottom surface of the limiting groove 3313 can be the aforementioned first limiting surface 3311. For example... Figure 18 As shown, after removing the locking member 6, the far end face of the inner slider 312 can be made to abut against the bottom surface of the limiting groove 3313 by rotating the rotating handle 311, so as to ensure that the fixing anchor 5 is completely removed from the constraint member 4.

[0160] Based on the conveyor 100 described above, this embodiment of the invention also provides a conveying system 1000, wherein the conveying system 1000 includes a film-coated support 200 and the conveyor 100 described above. The film-coated support 200 includes a self-expanding main support 220 and an annular bare support 210, wherein the main support 220 is annular, the annular bare support 210 is disposed at the distal end of the main support 220, and the annular bare support 210 has a plurality of hooking portions 211 for hooking onto the anchor hook 52.

[0161] In summary, compared with the prior art, the delivery system 1000 has at least the following beneficial effects: By adopting the aforementioned delivery device 100, the delivery system 1000 adds a semi-release adjustment process before the covered stent 200 is fully released, which allows the surgeon to adjust the shape and position of the covered stent 200 in a timely manner according to the patient's actual situation during the operation, thereby improving the success rate of the operation, ensuring the patient's life safety, and also reducing the surgeon's skill requirements.

[0162] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A conveyor, characterized in that, The conveyor includes a sheath core assembly, an outer sheath tube, and a conveying handle. The sheath core assembly includes an inner sheath core and an outer sheath core sleeved outside the inner sheath core. The outer sheath tube is sleeved outside the outer sheath core. The proximal ends of the inner sheath core, the outer sheath core, and the outer sheath tube are all connected to the conveying handle. Under the adjustment of the conveying handle, the inner sheath core and the outer sheath core, as well as the outer sheath tube and the sheath core assembly, can move relative to each other in the axial direction. The sheath core assembly further includes a sleeve-shaped constraint member and a fixing anchor. The constraint member is sleeved outside the distal end of the inner sheath core and fixed relative to the inner sheath core. The fixing anchor is fixed to the distal end of the outer sheath core. During the axial relative movement between the inner sheath core and the outer sheath core, and between the outer sheath tube and the sheath core assembly, at least a portion of the fixing anchor can be inserted into the constraint member, and the outer sheath tube can be sleeved outside the constraint member. The fixed anchor includes a main body with a preset axial length and a plurality of anchor hooks disposed on the outer wall of the main body for hooking the bare bracket of the film-coated bracket. The outer wall of the main body has a limiting groove formed on the proximal side of each of the anchor hooks for receiving the wave rod of the bare bracket. Before the fixed anchor is inserted into the constraint member and the bare bracket is disengaged from the anchor hook, the bare bracket can be radially compressed by the constraint member during the relative axial movement of the inner sheath core and the outer sheath core, so that the wave rod can be re-accommodated in the limiting groove, thereby driving the main bracket connected to the wave rod to be radially compressed. It also includes a throttle assembly and a locking member. The throttle assembly is sleeved on the inner sheath core and is used to drive the inner sheath core to move axially. The locking member is detachably disposed on the distal end of the throttle assembly. The locking member limits the bare bracket to be kept in a semi-released state. The locking member includes a locking sleeve with a circumferential opening and a limiting rib protruding from the inner wall of the locking sleeve toward the circumferential opening and having a through hole for the inner sheath core to pass through. The two opposite sides of the limiting rib in the radial direction and the inner wall of the locking sleeve respectively form a first insertion hole and a second insertion hole.

2. The conveyor according to claim 1, characterized in that, The anchor extends from the proximal end of the main body toward the distal end and gradually deviates from the outer wall of the main body.

3. The conveyor according to claim 1, characterized in that, The outer wall of the main body is recessed with a groove that communicates with the limiting groove and the bottom of the groove is for the anchor hook to protrude. The radial height of the bottom of the groove in the main body is less than the radial height of the bottom of the limiting groove.

4. The conveyor according to any one of claims 1 to 3, characterized in that, The angle range of the anchor hook deviating from the outer wall of the main body during its extension from the proximal end to the distal end of the main body is 70° to 90°. And / or, the outer wall of the main body is provided with a limiting rib corresponding to each anchor hook on the proximal side of the anchor hook, and the limiting ribs are circumferentially spaced and located between two limiting grooves corresponding to the same anchor hook; And / or, each of the anchor hooks corresponds to two of the limiting grooves, and the two limiting grooves are arranged symmetrically with respect to the center of the corresponding anchor hook; And / or, the distal surface of the main body is a guide arc surface, and the angle between the tangent of the guide arc surface and the axis of the main body is an obtuse angle.

5. The conveyor according to any one of claims 1 to 3, characterized in that, The throttle assembly has a first axial movement distance and a second axial movement distance, the second axial movement distance being greater than the first axial movement distance; within the first axial movement distance range, the fixed anchor is always at least partially inserted into the constraint member, and the constraint member has a radial constraint on the bare bracket hooked on the fixed anchor; within the second axial movement distance range, the constraint member no longer has a radial constraint on the bare bracket hooked on the fixed anchor, and the bare bracket can detach from the anchor hook.

6. The conveyor according to claim 5, characterized in that, The outer wall of the main body is provided with a limiting step, which is used to abut against the proximal end of the constraint member when the insertion section of the fixed anchor is fully inserted into the constraint member.

7. The conveyor according to claim 5, characterized in that, The delivery handle also includes a main handle sleeved on the inner sheath core and the outer sheath core, for adjusting the axial movement of the outer sheath tube, and an intermediate connector connected to the proximal end of the main handle; the throttle assembly is axially movable and connected to the proximal end of the intermediate connector. The locking member is detachably disposed between the intermediate connector and the throttle assembly; when the locking member is located between the intermediate connector and the throttle assembly, the throttle assembly has only a first axial movement distance; after the locking member is removed from between the intermediate connector and the throttle assembly, the throttle assembly has a second axial movement distance.

8. The conveyor according to claim 7, characterized in that, The intermediate connector includes a connecting part connected to the proximal end of the main handle and having a first limiting surface at the proximal end; the throttle assembly includes a rotating handle sleeved on the proximal side of the connecting part and fitted onto the inner sheath core, and an inner slider fixedly sleeved on the inner sheath core and helically connected to the rotating handle inside the rotating handle to drive the inner sheath core to move axially, wherein the maximum axial distance between the distal end face of the inner slider and the first limiting surface is the second axial movement distance; The locking member is provided with a second limiting surface. When the locking member is disassembled and fitted onto the connecting part of the intermediate connector, the maximum axial distance between the distal end face of the inner slider and the second limiting surface near the inner slider is the first axial movement distance.

9. The conveyor according to claim 8, characterized in that, The intermediate connector also includes a guide rod portion connected to the proximal end of the connector portion, and the throttle assembly also includes a tail cap sleeved on the proximal side of the rotary handle and disposed on the proximal end of the guide rod portion; The inner slider is slidably sleeved on the guide rod between the connecting part and the tail end cap; Before the bare bracket is disengaged from the anchor hook, the locking member is detachably connected to the guide rod between the connecting part and the rotating handle.

10. The conveyor according to claim 8, characterized in that, When the locking member is fitted onto the connecting portion, the proximal end face of the limiting rib is the second limiting surface; When the intermediate connector further includes a guide rod portion connected to the proximal end of the connector portion, the first insertion hole and the second insertion hole are slidably inserted into the guide rod portion; When the throttle assembly further includes a tail cap that is sleeved on the proximal side of the throttle handle and disposed on the proximal end of the guide rod, the proximal end of the throttle handle is sleeved on the distal end of the tail cap, and the distal end is sleeved on the proximal end of the locking sleeve.

11. The conveyor according to claim 10, characterized in that, The axial length of the limiting rib is less than the axial length of the locking sleeve, and neither of the two opposite ends of the limiting rib in the axial direction protrudes from the locking sleeve.

12. The conveyor according to claim 10, characterized in that, The distal end of the tail cap has a supporting rib protruding towards the inner slider, which allows the proximal end of the rotating handle to be rotatably sleeved. And / or, the proximal end of the lock sleeve is recessed with a first transition step, and the distal end of the rotary handle is recessed with a second transition step that mates with the first transition step. And / or, the proximal end of the connecting portion of the intermediate connector has a support boss protruding toward the inner slider for the distal end of the rotating handle to be rotatably sleeved.

13. A conveying system, characterized in that, The conveying system includes a covered support and a conveyor as described in any one of claims 1 to 12 for loading and releasing the covered support. The covered support includes a self-expanding main support and a bare support disposed at the distal end of the main support. The bare support at the distal end of the covered support can be hooked onto the anchor hook of the fixed anchor. Before the bare support is disengaged from the anchor hook, the bare support can cause the main support of the covered support to be radially compressed under the constraint of the constraint member of the conveyor.

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