Conveyor and conveying system

Abstract

The invention relates to a conveyor and a conveying system.The conveyor comprises an inner sheath core, an outer sheath core, an outer sheath tube, a conveying handle, a restraining piece and a fixing anchor which are sequentially connected in a sleeved mode, and the near end of the inner sheath core, the near end of the outer sheath core and the near end of the outer sheath tube are all connected with the conveying handle so that the inner sheath core, the outer sheath core and the outer sheath tube can axially and relatively move under adjustment of the conveying handle; the restraining piece is fixed to the far end of the inner sheath core, and the fixing anchor is connected with the far end of the outer sheath core so that at least part of the restraining piece can be inserted into the restraining piece when the inner sheath core and the outer sheath core move relative to each other in the axial direction. The fixing anchor comprises a main body part and a plurality of anchor hooks, and limiting grooves are formed in the positions, on the near-end sides of the anchor hooks, of the outer wall of the main body part. According to the conveyor, before the bare stent is separated from the anchor hook, the wave rod of the bare stent is radially compressed through the restraining piece in the relative axial movement process of the inner sheath core and the outer sheath core, so that the wave rod can be contained in the limiting groove again, the main body stent connected with the wave rod is driven to be radially compressed, and in the release debugging process, the main body stent can be released. The shape and the position of the covered stent can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and particularly to a delivery device and a delivery system. Background Art

[0002] In interventional surgery, 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. After the implant is anchored at the predetermined position, the delivery device is withdrawn. Taking the interventional surgery for abdominal aortic aneurysm as an example, the operator radially compresses the stent into the outer sheath of the delivery device in advance, and then sends the delivery outer sheath of the delivery device loaded with the stent to the lesion site through an incision in the proximal aorta such as the femoral artery of the human body. Then, the stent is released from the outer sheath at a predetermined position. After the covered part and the bare stent part of the stent are completely released, the stent can be fully expanded and tightly anchored to the blood vessel wall, and the covering film of the stent can isolate the blood flow and the lesion site to eliminate the impact of the blood flow on the lesion site, and a new blood flow circulation channel is re-established through the lumen of the stent. Finally, the sheath core, outer sheath, etc. of the delivery device are directly withdrawn, so as to realize the interventional treatment of aneurysms and aortic dissections.

[0003] Due to the influence of blood flow pulsation, friction, etc., during the stent release process and before complete release and anchoring, the position of the stent may change due to the influence of blood flow impact, etc. If the stent position changes greatly, it is easy to cause the occlusion of the renal artery branch or the failure to cover the lesion site, resulting in surgical failure and threatening the life safety of the patient. Therefore, it is particularly important to maintain the shape and position of the stent before complete release. However, in the existing delivery system, the distal end of the sheath core only hooks the bare stent at the distal end of the covered stent, and then the sheath core and the stent are sleeved in the outer sheath. After the delivery system reaches the preset position, the outer sheath is withdrawn, and the end of the covered stent closest to the bare stent expands self-expandingly first. Once the end of the covered stent connected to the bare stent expands, the existing delivery system cannot adjust the shape and position of the partially expanded stent, which undoubtedly increases the surgical difficulty and risk. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to solve the technical problem that the existing delivery device cannot readjust the shape and position of the stent after partial release of the covered section of the stent.

[0005] To solve the above technical problem, the embodiments of the present invention 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. And under the adjustment of the conveying handle, relative axial movement can occur between the inner sheath core and the outer sheath core, and between the outer sheath tube and the sheath core assembly;

[0007] Wherein, the sheath core assembly further includes a sleeve-shaped restraint and a fixing anchor. The restraint is sleeved outside the distal end of the inner sheath core and is relatively fixed to the inner sheath core; the fixing anchor is fixed to the distal end of the outer sheath core. During the relative axial 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 part of the fixing anchor can be inserted into the restraint, and the outer sheath tube can be sleeved outside the restraint;

[0008] The fixing anchor includes a main body portion having a preset axial length and a plurality of anchor hooks provided on the outer wall of the main body portion for hooking the bare stent of the covered stent. The outer wall of the main body portion forms a limit groove for receiving the wave rod of the bare stent on the proximal side of each anchor hook;

[0009] Before the fixing anchor is inserted into the restraint and the bare stent disengages from the anchor hook, during the relative axial movement of the inner sheath core and the outer sheath core, the restraint can radially compress the wave rod of the bare stent so that the wave rod can be re-received in the limit groove, thereby driving the main body stent connected to the wave rod to be radially compressed.

[0010] In some embodiments of the conveyor of the present invention, the anchor hooks extend along the proximal end towards the distal end of the main body portion and gradually deviate from the outer wall of the main body portion.

[0011] In some embodiments of the conveyor of the present invention, a groove communicating with the limit groove is recessed on the outer wall of the main body portion, 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 portion is less than the radial height of the bottom of the limit 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 from the proximal end to the distal end of the main body portion is 70° to 90°;

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

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

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

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

[0017] The rotating handle assembly has a first axial moving distance and a second axial moving distance, and the second axial moving distance is greater than the first axial moving distance; within the range of the first axial moving distance, the fixed anchor is always at least partially inserted into the restraint, and the restraint has a radial restraint on the bare stent hooked on the fixed anchor; within the second axial moving distance, the restraint no longer has a radial restraint on the bare stent hooked on the fixed anchor, and the bare stent can be disengaged 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 portion, and the limiting step is used to abut against the proximal end of the restraint when the insertion section of the fixed anchor completely enters the restraint.

[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 side of the main handle; the rotating handle assembly is axially movably connected to the proximal end of the intermediate connecting member;

[0020] The conveyor further includes a locking member detachably provided between the intermediate connecting member and the rotating handle assembly; when the locking member is located between the intermediate connecting member and the rotating handle assembly, the rotating handle assembly only has a first axial moving distance; after the locking member is removed from between the intermediate connecting member and the rotating handle assembly, the rotating handle assembly has a second axial moving distance.

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

[0022] The locking member is provided with a second limiting surface. When the locking member is detachably sleeved on the connecting portion of the intermediate connecting member, the maximum axial distance between the distal end surface of the inner slider and the second limiting surface close to the inner slider is the first axial moving distance.

[0023] In some embodiments of the conveyor of the present invention, the intermediate connecting member further includes a guide rod portion connected to the proximal end of the connecting portion, and the rotary handle assembly further includes a tail end cover sleeved on the inner sheath core on the proximal side of the rotary handle and arranged at the proximal end of the guide rod portion;

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

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

[0026] In some embodiments of the conveyor of the present invention, the locking member includes a lock sleeve fixedly sleeved on the connecting portion with a circumferential opening, and a limiting rib protruding from the inner wall of the lock sleeve towards 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 surface of the limiting rib is the second limiting surface;

[0027] When the intermediate connecting member further includes a guide rod portion connected to the proximal end of the connecting portion, first insertion holes and second insertion holes for slidably inserting the guide rod portion are respectively defined between the opposite sides of the limiting rib in the radial direction and the inner wall of the lock sleeve;

[0028] When the rotary handle assembly further includes a tail end cover sleeved on the inner sheath core on the proximal side of the rotary handle and arranged at the proximal end of the guide rod portion, the proximal end of the rotary handle is sleeved on the distal end of the tail end cover, and the proximal end of the lock sleeve is sleeved on the distal end.

[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 lock sleeve, and both opposite ends of the limiting rib in the axial direction do not protrude from the lock sleeve.

[0030] In some embodiments of the conveyor of the present invention, a supporting convex rib for rotatably sleeving the proximal end of the rotary handle is protruded from the distal end of the tail end cover towards the inner slider;

[0031] And / or, a first transition step is recessed at the proximal end of the lock sleeve, and a second transition step for engaging with the first transition step in a concave-convex manner is recessed at the distal end of the rotary handle;

[0032] And / or, a supporting convex platform for rotatably sleeving the distal end of the rotary handle is protruded from the proximal end of the connecting portion of the intermediate connecting member towards the inner slider.

[0033] To solve the above technical problems, this embodiment also provides a conveying system, adopting the following technical solution: The conveying system includes a film-covered stent and a conveyor for loading and releasing the film-covered stent as described above. The film-covered stent includes a self-expanding main stent and a bare stent disposed at the distal end of the main stent. The bare stent at the distal end of the film-covered stent can be hooked on the anchor hook of the fixed anchor; before the bare stent detaches from the anchor hook, the bare stent can drive the main stent of the film-covered stent to be radially compressed under the restraint of the restraint member of the conveyor.

[0034] Compared with the prior art, the conveyor and the conveying system provided by the embodiments of the present invention mainly have the following beneficial effects:

[0035] The conveyor of the present invention adds a restraint member fixedly sleeved at the distal end of the inner sheath core, and a plurality of anchor hooks for hooking the bare stent of the film-covered stent are provided on the outer wall of the main body of the fixed anchor connected with the outer sheath core. A limiting groove for accommodating the wave rod of the bare stent is formed on the proximal side of each anchor hook. Under the adjustment of the conveying handle, the relative axial movement among the inner sheath core, the outer sheath core and the sheath tube is enabled, so that when the film-covered stent is in a semi-released state and before the bare stent detaches from the anchor hook, within the maximum movable axial stroke range between the fixed anchor and the restraint member, the restraint member reciprocates to move away from or close to the fixed anchor, thereby enabling the part of the film-covered stent at the connection position between the bare stent and the main stent and its vicinity to be subjected to controllable self-expansion deployment and contraction in the circumferential direction, so as to add a semi-release debugging process before the film-covered stent is completely released, which is beneficial for the surgeon to timely adjust the shape and position of the film-covered stent according to the actual situation of the patient during the operation, thereby improving the success rate of the operation, ensuring the life safety of the patient, and also being beneficial for reducing the medical skill requirements for the surgeon. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the solutions in the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention or the corresponding prior art. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0037] Wherein:

[0038] Figure 1 is a schematic plan view of the conveyor in an embodiment of the present invention; wherein, in this figure, the front part of the conveyor is subjected to partial section treatment;

[0039] Figure 2 is Figure 1 an enlarged view of the longitudinal section after sectioning at A in

[0040] Figure 3 Schematic three-dimensional structure diagram of the sheath core assembly, fixed anchor and restraint sleeve of the conveyor in an embodiment of the present invention, with the inner sheath core sleeved and axially separated;

[0041] Figure 4 Schematic three-dimensional structure diagram of the fixed anchor of the conveyor with a bare stent hooked in an embodiment of the present invention;

[0042] Figure 5 Schematic three-dimensional structure diagram of the fixed anchor of the conveyor with a bare stent hooked inserted into the restraint member, and the proximal end of the restraint member abutted against the limit step of the fixed anchor in an embodiment of the present invention;

[0043] Figure 6 Front view of the fixed anchor of the conveyor in an embodiment of the present invention;

[0044] Figure 7 is Figure 6 Planar cross-sectional view of the A-A section in;

[0045] Figure 8 Left view of the fixed anchor of the conveyor in an embodiment of the present invention;

[0046] Figure 9 Schematic diagram of the principle of the front end part of the conveyor advancing in the blood vessel along the guide wire entering the blood vessel in an embodiment of the present invention; wherein, this figure is a diagram before the separated fixed anchor and restraint member are inserted;

[0047] Figure 10 Schematic diagram of the principle of the fixed anchor of the conveyor being received into the restraint member; wherein, in this figure, the restraint member is axially arranged at the end of the sheath core assembly;

[0048] Figure 11 Schematic planar structure diagram of the conveyor loading a covered stent to form a delivery system, the outer sheath tube releasing part of the main stent, the locking member being in the locked state, and the bare stent having a maximum axial distance that can reciprocate before detaching from the anchor hook in an embodiment of the present invention;

[0049] Figure 12 Schematic planar structure diagram of the conveyor loading a covered stent to form a delivery system, the outer sheath tube releasing part of the main stent, the locking member being in the locked state, the bare stent being in a radially constrained state, and the inner sheath core driving the restraint member to axially move a certain distance distally in an embodiment of the present invention;

[0050] Figure 13 Schematic planar structure diagram of the outer sheath tube and the restraint member of the conveyor being inserted into each other in the outer sheath tube, the rotating handle rotating to drive the inner sheath core to axially move a certain distance distally within the reciprocating movement range and then removing the locking member in an embodiment of the present invention;

[0051] Figure 14 is Figure 13 A partial enlarged view after making the end, restraint member, and outer sheath tube at position B in [Figure] transparent;

[0052] Figure 15 is Figure 13 An enlarged view after longitudinally sectioning at position C in [Figure];

[0053] Figure 16 A planar structure diagram of the conveyor in an embodiment of the present invention after removing the locking member, and the restraint member and the end are separated from the outer sheath tube under the drive of the rotary handle assembly;

[0054] Figure 17 is Figure 16 A partial enlarged view after making the end, restraint member, and outer sheath tube at position D in [Figure] transparent;

[0055] Figure 18 is Figure 16 An enlarged view after longitudinally sectioning at position E in [Figure];

[0056] Figure 19 A perspective three - dimensional structure diagram of the intermediate connector, locking member, rotary handle assembly, etc. of the conveyor during assembly in an embodiment of the present invention;

[0057] Figure 20 is Figure 19 A perspective exploded three - dimensional diagram of the assembly structure from the same perspective;

[0058] Figure 21 A perspective three - dimensional structure diagram of the intermediate connector, locking member, rotary handle assembly, etc. of the conveyor during assembly from another perspective in an embodiment of the present invention;

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

[0060] The reference numerals in the drawings are as follows:

[0061] 1000, conveying system; 100, conveyor; 200, film - covering bracket; 210, bare bracket; 211, hooking part; 212, wave rod; 220, main body bracket; 300, blood vessel; 400, guide wire;

[0062] 1, sheath core assembly; 11, inner sheath core; 12, outer sheath core; 13, end; 14, wire - passing channel; 15, Luer connector;

[0063] 2, outer sheath tube; 21, first shaft hole;

[0064] 3. Delivery handle; 31. Throttle assembly; 311. Rotating handle; 3112. Second adapter step; 3113. Anti-slip structure; 3114. Internal thread; 312. Inner slider; 3121. External thread; 313. Tail end cover; 3131. Support rib

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

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

[0067] 4. Constraint member; 41. Constraint shaft hole; 42. First cylindrical part; 43. Second cylindrical part

[0068] 5. Fixed anchor; 51. Main body part; 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. Abutting section; 554. Transition arc surface; 555. Conical surface

[0069] 6. Locking member; 61. Second limiting surface; 62. Locking sleeve; 621. Circumferential opening; 622. First adapter step; 63. Limiting rib; 631. Through hole; 64. First jack; 65. Second jack Detailed implementation mode

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs; the terms used in the description of this invention are only for the purpose of describing specific embodiments and are not intended to limit the invention. For example, terms such as "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, and are only for convenience of description and cannot be construed as a limitation to the technical solution of this application.

[0071] The terms "comprising" and "having" and any variations thereof in the description and claims of this invention and the above-mentioned drawings are intended to cover non-exclusive inclusion; the terms "first", "second", etc. in the description and claims of this invention or the above-mentioned drawings are used to distinguish different objects and not to describe a specific order. The meaning of "a plurality" is two or more unless otherwise specifically defined.

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

[0073] In addition, the mention of "embodiment" herein means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the description and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand 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 conventional terms. Among them, "proximal" refers to the end of the medical device implanted in the body that is close to the operator, and "distal" refers to the end far from the operator. And based on this principle, the "proximal" and "distal" of any part of the medical device are defined. "Axial" generally refers to the length direction of the medical device when it is being delivered, and "radial" generally refers to the direction perpendicular to its "axial" direction of the medical device, and based on this principle, the "axial" and "radial" of any part of the medical device are defined. "Intermediate section" generally refers to the part of any part of the medical device that is different from the two ends, and does not only refer to the part located in the exact middle position of any part of the medical device.

[0075] An embodiment of the present invention provides a delivery device 100. Using this delivery device 100, an implant is delivered into a patient's body through an interventional approach. Exemplarily, the implant can be a stent, of course, it is not limited thereto. Generally speaking, using the delivery device 100 of the present application can facilitate the operator to adjust the shape of the implant according to the actual situation during the process of releasing the implant, which is beneficial to accurately adjust and release the implant to achieve the best implant state, reduce the requirements for the operator and reduce the surgical risk of the patient.

[0076] Exemplarily, for the convenience of description, the exemplary delivery device 100 of the present invention will be described in combination with an implant below. The delivery device 100 is loaded with an implant, that is, a stent. The loaded stent has self-expanding properties. The stent includes a main stent 220 and a bare stent 210. The bare stent 210 is disposed at the distal end of the main stent 220. Exemplarily, the bare stent 210 can be spliced by a plurality of wave rods 212 to form an annular wave structure. Hooking portions 211 are formed at the wave crests of the bare stent 210, and each hooking portion 211 is connected to a wave rod 212 on both sides respectively. Of course, the bare stent 210 can also adopt other suitable structures, which are not particularly limited herein.

[0077] Such asFigures 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 Figure 1 and Figure 3 shown, the outer sheath tube 2 is axially provided with a first axial hole 21. The sheath core assembly 1 is placed in the first axial 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] In addition, the proximal ends of the inner sheath core assembly, the outer sheath core assembly, and the outer sheath tube 2 are all connected to the conveying handle 3. Under the adjustment of the conveying handle 3, relative axial movement can occur between the inner sheath core assembly and the outer sheath core assembly, and between the outer sheath tube 2 and the sheath core assembly 1, so as to realize the loading, release, and adjustment of the stent through the cooperation of the inner sheath core assembly, the outer sheath core assembly, and the outer sheath tube 2. It should be noted that in order to facilitate passage in the blood vessel 300, the outer sheath tube 2 can be a plastic tube with toughness. For example, the outer sheath tube 2 can be made of at least one of materials such as nylon, polyimide, polyurethane, polyester, etc., so that the outer sheath tube 2 has strong strength and also has anti-folding properties, etc.

[0079] In this embodiment, as Figure 1 and Figure 3 shown, the inner sheath core assembly includes an inner sheath core 11 and a sleeve-shaped restraint 4. The sleeve-shaped restraint 4 is relatively fixed to the distal end of the inner sheath core 11. The outer sheath core assembly includes an outer sheath core 12 and a fixed anchor 5. The fixed anchor 5 is relatively fixed to the distal end of the outer sheath core 12. The fixed anchor 5 can be at least partially inserted into and extended out of the restraint 4 during the axial relative movement between the inner sheath core assembly and the outer sheath core assembly. The outer sheath tube 2 is sleeved outside the restraint 4.

[0080] It should be noted that, as Figure 1 and Figure 3 shown, in order to facilitate the formation of a guide during the conveying process of the conveyor to relatively fix the restraint 4 and the distal end of the inner sheath core 11 at the same time, the inner sheath core assembly further includes a head 13. Among them, the head 13 is axially provided with a wire passing channel 14 for a guide wire 400 (see Figure 9 ) to pass through; at the position corresponding to the wire passing channel 14, the restraint 4 is axially provided with a restraint axial hole 41 communicating with the wire passing channel 14. The distal end of the inner sheath core 11 passes through the restraint axial hole 41 and is connected to the head 13, and the distal end of the restraint 4 is connected to the proximal end of the head 13, so that the restraint 4 is relatively fixed to the inner sheath core 11, and the restraint 4 can move with the movement of the inner sheath core 11.

[0081] Exemplarily, specifically in this embodiment, the restraint 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. Among them, 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 and is placed in the first axial hole 21 of the outer sheath tube 2 when the outer sheath tube 2 is not retracted. When the stent needs to be released, the outer sheath tube 2 is retracted (i.e., moved towards the proximal end) so that the second cylindrical portion 43 of the restraint member 4 is axially separated from the outer sheath tube 2 (see Figure 12 ), as the outer sheath tube 2 continues to move, the covered stent 200 expands by self-expansion. At this time, the bare stent 210 of the covered stent 200 is still hooked on the fixed anchor 5 of the sheath core assembly 1, and at this time, the distal end of the fixed anchor 5 is also placed inside the restraint member 4. Of course, in other embodiments, the restraint member 4 can also adopt other suitable structures and can also be connected to the end head 13 by other suitable connection methods.

[0082] It should also be noted that as Figure 1 shown, the sheath core assembly 1 further includes a Luer connector 15. Among them, the Luer connector 15 is arranged at the proximal end of the inner sheath core 11 on the proximal side of the delivery handle 3 to be used for connecting a syringe to flush the inner sheath core 11, or to communicate with the wire passage 14 of the end head 13 through the inner sheath core 11 to inject contrast agent into the body, etc. Specifically, the Luer connector 15 can be connected to the proximal end of the inner sheath core 11 by injection molding, glue bonding, or threaded connection, etc.

[0083] As Figure 1 shown, the fixed anchor 5 is connected to the distal end of the outer sheath core 12 so that at least part of the fixed anchor 5 can be inserted into the restraint member 4 when the inner sheath core 11 and the outer sheath core 12 move axially relative to each other. It can be understood that during the relative axial movement of the inner sheath core 11 and the outer sheath core 12, the restraint member 4 and the fixed anchor 5 respectively fixed to the distal ends of the inner sheath core 11 and the outer sheath core 12 will also move axially relative to each other to enable at least part of the fixed anchor 5 to be inserted into or withdrawn from the restraint member 4.

[0084] Exemplarily, specifically in the embodiment, the outer sheath core 12 can be directly fixedly connected to the delivery handle 3. In this way, in the body, the fixed anchor 5 connected to the distal end of the outer sheath core 12 is also fixed, and only by axially moving the inner sheath core 11 through the delivery handle 3 can at least part of the fixed anchor 5 be inserted into the restraint member 4 or withdrawn from the restraint member 4. Of course, in other embodiments, other suitable structures can also be adopted to realize the relative axial movement between the fixed anchor 5 and the restraint member 4, which will not be elaborated here.

[0085] In this embodiment, as Figure 1 , Figures 3 to 7As shown, the fixed anchor 5 includes a main body portion 51 and a plurality of anchor hooks 52. Among them, the main body portion 51 has a preset axial length to enable the relative insertion of the fixed anchor 5 and the restraint member 4, and the fixed anchor 5 has a length that can reciprocate within the restraint member 4. Through this length, the bare stent 210 of the covered stent 200 can be re-constrained, thereby facilitating the operator to more flexibly control the shape of the stent during the relative axial movement of the fixed anchor 5 and the restraint member 4.

[0086] It should be noted that a second axial hole 512 is axially formed in the main body portion 51 of the fixed anchor 5 (see Figure 4 ). Among them, the inner sheath core 11 can pass through the second axial hole 512 and the restraint axial hole 41 of the restraint member 4 to be connected to the end 13. Specifically, in this embodiment, the distal end of the outer sheath core 12 sleeved outside the inner sheath core 11 can also be inserted into the second axial hole 512. Specifically, the distal end of the outer sheath core 12 can be connected to the hole wall of the second axial hole 512 by injection molding, glue bonding, screw connection or other means to fixedly connect the fixed anchor 5 to the distal end of the outer sheath core 12. Preferably, the distal end surface of the outer sheath core 12 is flush with the distal end surface of the fixed anchor 5 to protect the entire inner sheath core 11 passing through the second axial hole 512.

[0087] As Figure 3 and Figure 4 shown, the plurality of anchor hooks 52 are circumferentially spaced on the outer wall of the main body portion 51 for the hooking portion 211 of the bare stent 210 of the covered stent 200 to hook. On the proximal side of each anchor hook 52, a limiting groove 53 for receiving the wave rod 212 of the bare stent 210 is formed on the outer wall of the main body portion 51. Exemplarily, the anchor hooks 52 generally correspond to the hooking portions 211 of the bare stent 210 one by one, and each hooking portion 211 is correspondingly connected to two wave rods 212, that is, each anchor hook 52 corresponds to two limiting grooves 53.

[0088] It can be understood that when the bare stent 210 is hooked on the anchor hook 52 and the wave rod 212 is received in the limiting groove 53, on the one hand, it can prevent the bare stent 210 from tilting after being hooked on the anchor hook 52, facilitating the smooth accommodation of the bare stent 210 and even the covered stent 200 in the first axial hole 21 of the outer sheath tube 2, and reducing the friction between the bare stent 210 and the inner wall of the sheath tube 2; on the other hand, it can play a limiting role on the bare stent 210 hooked on the anchor hook 52, preventing the bare stent 210 from shaking easily when the covered stent 200 is inserted into the outer sheath tube 2 and damaging the sheath tube 2. At the same time, the wave rods of each bare stent 210 are relatively independent, avoiding mutual influence.

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

[0090] It can be understood from the above that when the covered stent 200 is not released in the body, that is, when neither the main body stent 220 of the bare stent 210 nor the bare stent 210 is released, at least the main body stent 220 of the covered stent 200 sleeved and hooked on the fixed anchor 5 is accommodated in the first axial hole 21 of the outer sheath tube 2, and the distal part of the fixed anchor 5 hooked with the bare stent 210 is inserted into the restraint axial hole 41 of the restraint member 4 in the first axial hole 21 of the outer sheath tube 2.

[0091] Exemplarily, the working principle of adjusting the shape of the covered stent 200 by using the transporter 100 of the present invention is generally as follows:

[0092] When the covered stent 200 is not released in the body, if it is necessary to release the covered stent 200 and adjust the shape of the covered stent 200, the outer sheath tube 2 can be axially moved relative to the sheath core assembly by operating the delivery handle 3 first. For example, the outer sheath tube 2 is adjusted to move proximally (see Figure 11 ), so that the proximal end of the restraint member 4 disengages from the first axial hole 21 of the outer sheath tube 2, and the distal end of the main body stent 220 of the covered stent 200 expands by self-expansion, and the main body stent 220 near the proximal end is still radially constrained in the first axial hole 21 of the outer sheath tube 2, that is, the covered stent 200 is in a semi-released state.

[0093] When the covered stent 200 is in a semi-released state, before the bare stent 210 disengages from the anchor hook 52, the inner sheath core 11 and the outer sheath core 12 can be axially moved relative to each other by operating the delivery handle 3 again. For example, the inner sheath core 11 is adjusted to move distally (see Figure 12 ), so that the restraint member 4 gradually moves away from the fixed anchor 5, thereby gradually releasing the wave rod 212 accommodated in the limiting groove 53 on the proximal side of the anchor hook 52. After the released wave rod 212 expands by self-expansion, it disengages from the limiting groove 53, and the main body stent 220 connected to the wave rod 212 will also expand and gradually unfold with the self-expanded wave rod 212.

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

[0095] Thus, before the main stent 220 of the stent graft 200 is completely released, the anchor 5 is plugged into the restraint 4, and before the bare stent 210 is separated from the anchor hook 52, the anchor 5 and the restraint 4 have a maximum movable axial travel L1 (see FIG. Figure 1 and Figure 6 ), within this stroke, the restraint 4 can move reciprocatingly so that the part of the coated stent 200 at and near the connection position of the bare stent 210 and the main stent 220 can be controllably self-expanded and contracted in the circumferential direction, so as to achieve the shape adjustment of the coated stent 200 when it is in a semi-released state, that is, before the coated stent 200 is fully released, it is released and debugged. When the coated stent 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 toward the distal end until the restraint 4 exits the above-mentioned maximum movable axial stroke range, so as to release the radial restraint of the restraint 4 on the bare stent 210, so that the bare stent 210 can be separated from the anchor hook 52 and self-expanded.

[0096] It should be noted that after the bare stent 210 is detached from the anchor hook 52 and fully deployed, the fixing anchor 5 can still be partially inserted into the constraint shaft hole 41 of the constraint member 4, and can also be completely detached 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 is provided with a restraining member 4 fixedly sleeved on the inner sheath core 11, and a plurality of anchor hooks 52 for hooking the bare stent 210 of the coated stent 200 are arranged on the outer wall of the main body 51 of the fixing anchor 5 connected to the outer sheath core 12, and a limiting groove 53 for accommodating the wave rod 212 of the bare stent 210 is formed on the proximal side of each anchor hook 52. Under the adjustment of the conveying handle 3, the inner sheath core 11, the outer sheath core 12 and the outer sheath tube 2 are relatively moved axially, so that when the coated stent 200 is in a semi-released state and before the bare stent 210 is separated from the anchor hook 52, the inner sheath core 11, the outer sheath core 12 and the outer sheath tube 2 can move relative to each other in the axial direction. Within the maximum movable axial travel range between the restraining parts 4, the restraining parts 4 are reciprocated to move away from or close to the fixing anchor 5, so that the part of the coated stent 200 at and near the connection position between the bare stent 210 and the main stent 220 is controllably self-expanded and contracted in the circumferential direction, so as to add a semi-release release debugging process before the coated stent 200 is fully released, which is beneficial for the surgeon to adjust the shape and position of the coated stent 200 in time according to the actual situation of the patient during the operation, thereby improving the success rate of the operation, ensuring the life safety of the patient, and also helping to reduce the medical skills requirements of the surgeon.

[0099] In order to make those skilled in the art better understand the present invention, Figures 1 to 22, clearly and completely describe the technical solutions in the embodiments of the present invention.

[0100] In some embodiments of the present invention, as Figure 1 , Figure 3 and Figure 7 shown, the distal end of the anchor hook 52 extends along the proximal end of the main body portion 51 towards the distal end and gradually deviates from the outer wall direction of the main body portion 51 of the fixed anchor 5, so that the anchor hook 52 inclines towards the distal end of the fixed anchor 5, thereby facilitating the hook portion 211 of the bare stent 210 to not only stably hook on the anchor hook 52 and not easily fall off, but also not affect the bare stent 210 to disengage from the anchor hook 52 and self-expand and deploy during the complete release process.

[0101] Preferably, as Figure 7 shown, when the anchor hook 52 inclines from the proximal end to the distal end of the main body portion 51, the inclination angle α of the anchor hook 52 is 70° - 90°, that is, the anchor hook 52 slightly inclines towards the distal end relative to the main body portion 51, so as to more smoothly disengage from the anchor hook 52 during the complete release process while ensuring that the bare stent 210 is stably hooked on the anchor hook 52.

[0102] It should be noted that the main body portion 51 of the fixed anchor 5 is a columnar body with the same or different diameters at different coaxial segments. Exemplarily, specifically in this embodiment, 6 anchor hooks 52 are provided, and the 6 anchor hooks 52 are evenly circumferentially arranged around the central axis of the main body portion 51. Of course, in other embodiments, the number of the anchor hooks 52 is not limited to 6, and the specific number can be determined according to the number of the hook portions 211 of the bare stent 210 of the loaded covered stent 200.

[0103] It should also be noted that in order to prevent the anchor hook 52 from rubbing against the restraint member 4 when the fixed anchor 5 is inserted into the restraint member 4, and when the fixed anchor 5 is withdrawn from the inside of the covered stent 200 after the covered stent 200 is completely released, the anchor hook 52 rubs against the blood vessel 300, the covered stent 200, the outer sheath tube 2, etc. and gets stuck, a fillet or a bevel is provided at the corresponding position of the anchor hook 52, so that the anchor hook 52 can smoothly contact other components and reduce the friction force.

[0104] In some embodiments of the present invention, as Figure 1 , Figure 3 , Figure 6 and Figure 7 shown, a groove 54 is recessed on the outer wall of the main body portion 51 of the fixed anchor 5. Among them, in the fixed anchor 5, the groove 54 communicates with the limiting groove 53, the bottom of the groove supplies the anchor hook 52 to protrude, and the radial height of the bottom of the groove 54 in the main body portion 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 with a radial height smaller than that of the bottom of the limiting groove 53, on the one hand, it can better conform to the shape of the bare stent 210 after radial compression, making it easier for the wave rods 212 of the bare stent 210 to be completely received in the limiting groove 53. Specifically, since the hooking part 211 of the bare stent 210 has to hook on the anchor hook 52 set on the bottom of the groove 54 with a smaller radial height, it will not only be subjected to the radial compression of the constraint member 4, but also be subjected to the radial traction force caused by the radial height difference between the distal end and the proximal end of the bare stent 210. Therefore, it is beneficial to increase the radial compression force on the distal end of the bare stent 210 and conform to the deformation trend of each wave rod 212 of the bare stent 210 gradually approaching from the proximal end to the distal end when the bare stent 210 is radially compressed, further strengthening the overall radial compression effect of the covered stent 200.

[0106] On the other hand, it is beneficial to reduce the diameter of the outer sheath 2 and realize the miniaturized design of the delivery device 100. Specifically, since the proximal end of the anchor hook 52 is set in the groove 54 with a lower radial height, the radial height of the top of the anchor hook 52 in its longitudinal section will also be reduced for the same length, so as to use a constraint member 4 and an outer sheath 2 with a smaller inner diameter to load and release the covered stent 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 is inclined gradually towards the distal end of the fixed anchor 5, so as to further conform to the shape of the wave rods 212 of the bare stent 210 after radial compression, enabling the wave rods 212 to be quickly received in the limiting groove 53 with a relatively small relative axial movement between the constraint member 4 and the fixed anchor 5, which is beneficial to improving the efficiency of the operator in adjusting the shape and position of the covered stent 200.

[0108] And / or, in some embodiments of the present invention, as Figures 3 to 7 shown, on the proximal side of the anchor hook 52, the outer wall of the main body part 51 of the fixed anchor 5 is convexly provided with limiting ribs 55 corresponding to each anchor hook 52. Among them, the limiting ribs 55 are circumferentially spaced, and each limiting rib 55 is located between two limiting grooves 53 corresponding to the same anchor hook 52, so that the two wave rods 212 corresponding to the same hooking part 211 can be independently and stably maintained in the 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 in order to avoid the limiting ribs 55 from rubbing against the blood vessel 300, the covered stent 200, the outer sheath 2, the constraint member 4, etc., and to prevent the fixed anchor 5 from getting stuck during forward movement or retraction, the corresponding parts of the limiting ribs 55 adopt a smooth transition structure. Exemplarily, such as Figure 3 、 Figure 6 and Figure 7As shown, the proximal outer profile surface of the limiting rib 55 is arranged as a conical surface 555 to form a conical cylinder structure; the distal outer profile surface of the limiting rib 55 is arranged as a transition arc surface 554.

[0110] And / or, in some embodiments of the present invention, such as Figure 3 and Figure 6 As shown, each anchor hook 52 corresponds to two limiting grooves 53, and the two limiting grooves 53 are symmetrically arranged with respect to the center of the corresponding anchor hook 52. So that when the covered stent 200 is in a contracted state, the peak of the bare stent 210 can just be hooked on the anchor hook 52. Similarly, the wave rods 212 on both sides of the peak can be received in the corresponding limiting grooves 53. Additionally, 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] Exemplarily, specifically in this embodiment, such as Figure 8 As shown, there are 6 anchor hooks 52, and the 6 anchor hooks 52 are circumferentially and uniformly arranged around the central axis of the main body part 51. Each anchor hook 52 corresponds to two limiting grooves 53, that is, a total of 12 limiting grooves 53 are provided on the main body part 51 of the fixed anchor 5 to correspondingly receive the 12 wave rods 212 forming the wave-ring-shaped bare stent 210.

[0112] And / or, in some embodiments of the present invention, such as Figure 3 、 Figure 6 and Figure 7 As shown, the distal end surface of the main body part 51 of the fixed anchor 5 is a guiding arc surface 511, so that the distal end of the main body part 51 can become the guiding head 513 of the fixed anchor 5. For example, as Figure 9 As shown, in scenarios such as when the transporter 100 bends forward in the in-vivo blood vessel 300 and the release debugging of the covered stent 200 by the transporter 100, the guiding head 513 can quickly guide the fixed anchor 5 to be aligned and connected with the restraint 4 through the transitional contact with the restraint 4.

[0113] Preferably, as Figure 7 As shown, the angle β between the tangent of the guiding arc surface 511 and the central axis of the fixed anchor 5 is an obtuse angle. Similarly, as Figure 10 As shown, the angle β between the tangent of the guiding arc surface 511 and the inner wall surface of the restraint 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 more easily slide into the restraint 4 through the contact between the guiding head 513 and the restraint 4, preventing the fixed anchor 5 from being stuck at the edge of the restraint 4 when moving back and forth.

[0114] Exemplarily, the guiding arc surface 511 is preferably a semi-spherical surface, and the maximum outer diameter of the guiding head 513 is smaller than the inner diameter of the restraint 4, so that the fixed anchor 5 can flexibly adjust its direction in the restraint 4 along with the restraint 4.

[0115] It should be noted that, specifically in this embodiment, such as Figure 7 and Figure 8 As shown, to enable the fixed anchor 5 to be smoothly inserted into the restraint member 4 and to ensure that the bare stent 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 delivery handle 3 includes a rotating handle assembly 31. Among them, the rotating handle assembly 31 is sleeved on the inner sheath core 11 and is mainly used to drive the inner sheath core 11 to axially move. Among them, the rotating handle assembly 31 has a first axial movement distance L4 and a second axial movement distance L3, and the second axial movement distance L3 is greater than the first axial movement distance L4; within the range of the first axial movement distance L4, the fixed anchor is always at least partially inserted into the restraint member and the restraint member has a radial restraint on the bare stent hooked on the fixed anchor; within the second axial movement distance L4, the restraint member no longer has a radial restraint on the bare stent hooked on the fixed anchor, and the bare stent can be disengaged from the anchor hook.

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

[0118] In addition, as Figure 1 shown, in scenarios such as when the covered stent 200 needs to be fully released, the maximum axial distance that the rotating handle assembly 31 drives the inner sheath core 11 to move the fixed anchor 5 out of the restraint member 4 is greater than the maximum axial distance L2 between the proximal end of the restraint member 4 and the distal end of the fixed anchor 5 within the restraint member 4. It can be understood that to enable the fixed anchor 5 to completely withdraw from the restraint member 4, the maximum axial distance that the rotating handle assembly 31 drives the inner sheath core 11 to move needs to be greater than the maximum length L2 of the fixed anchor 5 received within the restraint member 4.

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

[0120] In some embodiments of the present invention, or in some 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, and the locking member 6 is detachably arranged between the intermediate connector and the handle assembly; when the locking member is located between the intermediate connector and the handle assembly, the handle assembly has only a first axial movement distance L4; after the locking member is removed from between the intermediate connector and the handle assembly, the handle assembly has a second axial movement distance L3. Among them, the locking member 6 is mainly used to limit the handle assembly 31 when the fixed anchor 5 is received in the constraint member 4, so as to prevent the handle assembly 31 from driving the inner sheath core 11 to make the bare stent 210 detach from the anchor hook 52. It can be understood that before the coated stent 200 is adjusted to a suitable position, the bare stent 210 can be kept in a semi-released state by limiting the locking member 6, avoiding premature release of the bare stent 210 due to misoperation, and ensuring that the distal end of the bare stent 210 always has a radial constraint force from the constraint member 4, thereby facilitating the adjustment of the position and shape of the coated stent 200.

[0121] For example, Figure 11 and Figure 12 As shown, the locking member 6 is detachably arranged on the distal side of the turning handle assembly 31, so as to limit the turning handle assembly 31 from further driving the inner sheath core 11 forward when the turning handle assembly 31 drives the inner sheath core 11 to move axially forward, that is, the axial physical limit is directly performed through the locking member 6, so that the forward movement distance of the constraint member 4 connected to the inner sheath core 11 is limited, so as to ensure that the anchor hook 52 moves within the constraint member 4 within the reciprocating travel range. After the locking member 6 is removed, once the constraint member 4 moves forward to the distal side of the anchor hook 52 where its proximal end is located at the fixed anchor 5, the bare stent 210 will no longer be subject to the radial constraint force of the constraint member 4, but will be separated from the anchor hook 52 to self-expand and fully unfold.

[0122] In some embodiments of the present invention, 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 fixing anchor 5. When the proximal end of the restraining member 4 and the anchor hook 52 have a maximum axial distance, that is, when the length of the fixing anchor 5 received in the restraining member 4 is the longest, the limiting step 551 is mainly used for axially abutting against the proximal end of the restraining member 4.

[0123] Understandably, if Figure 1 and Figure 6 As shown, when the proximal end of the constraint member 4 and the limiting step 551 of the fixed anchor 5 axially abut against each other, the maximum axial distance L2 between the proximal end of the constraint member 4 and the distal end of the fixed anchor 5 in the constraint member 4 is the length of the fixed anchor 5 received in the constraint member 4, that is, 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 in the constraint member 4 is the stroke of the anchor hook 52 of the fixed anchor 5 in the constraint member 4, that is, 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 position and shape adjustment of the covered stent 200 in the body by radial constraint depends on the stroke of the constraint member 4. Exemplarily, when the transporter 100 has a locking member 6 and a limit 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 limit step 551. In this way, the bare stent 210 can be ensured to be in a radially constrained state through the locking member 6 and the limit step 551.

[0125] Specifically, as Figure 11 shown, when the covered stent 200 is in a semi-released release debugging state and the constraint member 4 abuts against the limit 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, since the bare stent 210 is radially constrained by the constraint member 4, the main stent 220 connected to the wave rod 212 of the bare stent 210 will also be radially constrained and the diameter will become smaller, and it cannot fully expand self-expandingly and fit against the wall of the blood vessel 300. This is beneficial to the adjustment of the position and shape of the covered stent 200.

[0126] As Figure 12 shown, through the limitation of the locking member 6, when the constraint member 4 connected to the inner sheath core 11 moves forward a certain distance within the reciprocating movement range driven by the rotary handle assembly 31, that is, when the proximal end of the constraint member 4 moves away from the limit step 551, the wave rod 212 of the bare stent 210 partially radially compressed by the constraint member 4 is released and expands self-expandingly and disengages from the limit groove 53. At this time, the main stent 220 connected to the wave rod 212 will also expand self-expandingly and the diameter will become larger.

[0127] In this way, within the movable stroke range defined by the locking member 6 and the limit step 551, by controlling the forward or backward movement of the constraint member 4 through the rotary handle assembly 31, the covered stent 200 in the semi-released state can adjust the expansion diameter in the blood vessel 300, enabling the operator to rotate the covered stent 200 circumferentially or move it forward and backward through the delivery handle 3 outside the body, so as to adjust to the optimal implantation position according to the actual situation of the patient.

[0128] Exemplarily, specifically in this embodiment, as Figure 1 、 Figures 4 to 8 shown, the limit step 551 is axially recessed on the limit rib 55 of the fixed anchor 5, so that the limit rib 55 includes an insertion section 552 and an abutting section 553. Specifically, the radial height of the insertion section 552 is less than the radial height of the distal end of the abutting section 553, so that the above-mentioned limit step 551 is formed at the connection between the insertion section 552 and the abutting 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 restraint member 4, so that the insertion section 552 can smoothly slide into or out of the restraint member 4. Correspondingly, the outer diameter of the distal end of the abutting section 553 is larger than the inner diameter of the proximal end of the restraint member 4, so as to achieve the abutment of the proximal end of the restraint member 4 against the distal end face of the abutting section 553. Preferably, the height of the limiting step 551 is the same as the wall thickness of the restraint member 4, so that the outer wall of the abutting section 553 is flush with the outer wall of the restraint member 4, which is beneficial to the smooth docking of the two.

[0130] And / or, in some embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 11 and Figure 12 shown, the conveying handle 3 specifically further includes a main handle 32 and an intermediate connecting member 33. Among them, 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 connecting member 33 is sleeved on the inner sheath core 11 on the proximal side of the main handle 32, and cooperates with the rotary handle assembly 31 on the distal side of the rotary handle assembly 31 to define the maximum axial movement distance for the fixed anchor 5 to withdraw from the restraint member 4 of the inner sheath core 11.

[0131] Understandably, the intermediate connecting member 33 is axially located between the main handle 32 and the rotary handle assembly 31. After the locking member 6 is removed or when there is no locking member 6, the rotary handle assembly 31 can move from the initial position to axially abut against the intermediate connecting member 33, and the further forward movement of the rotary handle assembly 31 driving the inner sheath core 11 is restricted through the intermediate connecting member 33, so as to ensure that the fixed anchor 5 can completely withdraw from the restraint member 4.

[0132] In addition, when the conveyor 100 further includes a locking member 6 and before the bare stent 210 is separated from the anchor hook 52, for example, when the covered stent 200 is in a semi-released release debugging state, the locking member 6 is detachably sleeved on the intermediate connecting member 33 on the distal side of the rotary handle assembly 31, so as to jointly define the reciprocating movement stroke range of the restraint member 4 for radially restraining the bare stent 210 through the locking member 6 and the limiting step 551, and after the locking member 6 is removed, the maximum axial distance L3 of the forward movement of the restraint member 4 itself is defined through the intermediate connecting member 33 (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 rod 324, a fixed handle 321, a movable handle 322, and a switch 323. Among them, the screw rod 324, the fixed handle 321, and the movable handle 322 are all sleeved on the inner sheath core 11, the outer sheath core 12, and the outer sheath tube 2. The fixed handle 321 is fixedly sleeved on the distal end of the screw rod 324 so that the fixed handle 321 can be held by hand to operate the delivery handle 3. The movable handle 322 is movably sleeved on the screw rod 324 on the proximal side 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 rod 324, or can be threadedly connected to the screw rod 324 to rotate relative to the screw rod 324, thereby driving the outer sheath tube 2 to move axially back and forth relative to the inner sheath core 11 and the outer sheath core 12. In addition, the intermediate connecting member 33 is axially connected to the proximal end of the screw rod 324, and a locking member 6 is detachably connected to the distal side of the rotary handle assembly 31.

[0134] Further exemplarily, during the operation, after the guide wire 400 intervenes into the blood vessel 300, the front half of the delivery device 100 loaded with the covered stent 200, specifically the part located on the distal side of the fixed handle 321, can be directly inserted into the blood vessel 300 along the guide wire 400, and the covered stent 200 can be delivered to the lesion position according to the position indication of the imaging points of the covered stent 200 in the CT image, such as Figure 11 shown. Then hold the fixed handle 321 by hand, rotate the movable handle 322 or drag the movable handle 322 after turning on the switch 323, so that the movable handle 322 moves backward relative to the fixed handle 321 to drive the outer sheath tube 2 to retreat, so as to release part of the main stent 220 of the covered stent 200. At this time, the proximal end of the restraint member 4 can abut against the limiting step 551 of the limiting rib 55, and the insertion section 552 of the limiting rib 55 is completely received into the restraint member 4, and the abutting section 553 is exposed outside the restraint member 4.

[0135] On this basis, as Figure 12 shown, further adjust the rotary handle assembly 31 to move the restraint 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 restraint member 4, that is, the proximal end of the restraint member 4 is in the middle position of the fixed anchor 5, so as to release more of the main stent 220, and the released main stent 220 further expands self-expandingly, and under the restriction of the locking member 6, the anchor hook 52 of the fixed anchor 5 is always received into the restraint member 4.

[0136] After the covered stent 200 is adjusted to the target position, the locking member 6 can be removed, and the rotary handle assembly 31 can be directly moved forward to quickly move the restraint member 4 to the distal side of the anchor hook 52 of the fixed anchor 5, so as to quickly release the bare stent 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, and then the remaining main stent 220 in the outer sheath 2 can be completely released. Alternatively, the remaining main stent 220 in the outer sheath 2 can be completely released first, and then the bare stent 210 can be completely released. Specifically, it can be determined according to the specific structure of the covered stent 200 and the operating habits of the operator, etc.

[0138] In some embodiments of the present invention, the following solutions can be adopted for adjusting the inner sheath core 11 by the rotating handle assembly 31 to drive the restraining member 4 to move back and forth:

[0139] As Figure 2 , Figures 13 to 18 shown, the intermediate connecting member 33 includes a connecting portion 331 having a first limiting surface 3311 provided at the proximal end. The distal end of the connecting portion 331 is connected to the proximal end of the main handle 32 (specifically, it can be the proximal end of the screw 324 of the main handle 32). In addition, to enable the rotating handle assembly 31 to adjust the back-and-forth movement function of the inner sheath core 11, the rotating handle assembly 31 includes a rotating handle 311 and an inner slider 312. Among them, the rotating handle 311 is sleeved on the inner sheath core 11 on the proximal side of the connecting portion 331, and the inner slider 312 is fixedly sleeved on the inner sheath core 11 and is helically connected with the rotating handle 311 inside the rotating handle 311 to drive the inner sheath core 11 to move axially.

[0140] Exemplarily, the inner slider 312 can be fixedly sleeved on the outer wall of the inner sheath core 11 by glue or other connection methods. An anti-slip structure 3113 is provided on the outside of the rotating handle 311, such as anti-slip threads, anti-slip bumps, etc. An internal thread 3114 is provided inside the rotating handle 311, and an external thread 3121 adapted to be threadedly engaged with the internal thread 3114 is provided on the outer wall of the inner slider 312. Among them, the axial length of the internal thread 3114 is greater than the axial length of the internal thread 3114. By rotating the rotating handle 311, through the threaded engagement of the internal thread 3114 and the external thread 3121, the inner slider 312 can drive the inner sheath core 11 connected thereto to move axially back and forth. It can be understood that the moving stroke of the inner slider 312 itself is the moving stroke of the restraining member 4.

[0141] Again, as Figure 2 shown, the maximum axial distance L3 between the distal end surface of the inner slider 312 and the first limiting surface 3311 of the connecting portion 331 is the maximum axial distance that the inner sheath core 11 can move to withdraw the fixed anchor 5 from the restraining member 4, that is, the second axial movement distance. In other words, during the movement of the inner slider 312, when the distal end surface of the inner slider 312 abuts against the first limiting surface 3311 of the connecting portion 331, the fixed anchor 5 should have been completely withdrawn from the restraining member 4.

[0142] In addition, as Figure 2 shown, the locking member 6 is provided with a second limiting surface 61 (see Figure 20 orFigure 22 ) When the locking member 6 is detachably sleeved on the connecting portion 331 of the intermediate connecting member 33, the maximum axial distance L4 (i.e., the first axial movement distance) between the distal end surface of the inner slider 312 and the second limiting surface 61 close to the inner slider 312 is less than the maximum axial distance that the inner slider 312 drives the inner sheath core 11 to enable the anchor hook 52 to reciprocate within the restraint member 4. In other words, when the covered stent 200 is in the half-released release debugging state, during the process of rotating the rotary handle 311 to move the restraint member 4 forward through the movement of the inner slider 312, if the distal end surface of the inner slider 312 abuts against the second limiting surface 61 of the locking member 6, the restraint member 4 cannot continue to move forward, so as to prevent the bare stent 210 from being released in advance.

[0143] Wherein, the maximum axial distance between the distal end surface of the inner slider and the first limiting surface is the second axial movement distance L3; when the locking member is detachably sleeved on the connecting portion of the intermediate connecting member, the maximum axial distance between the distal end surface of the inner slider and the second limiting surface close to the inner slider is the first axial movement distance L4.

[0144] Exemplarily, the working principle of the rotary handle assembly 31 is generally as follows:

[0145] When the locking member 6 is not disassembled, by rotating the rotary handle 311, the inner slider 312 can move back and forth within the rotary handle 311 to drive the restraint member 4 to axially reciprocate within the safe stroke through the inner sheath core 11, and the shape and position of the covered stent 200 are adjusted through the insertion and cooperation of the fixed anchor 5 and the restraint member 4. When the inner slider 312 moves within the rotary handle 311, its distal end surface can be located within the rotary handle 311 or can extend out of the rotary handle 311. If the distal end surface of the inner slider 312 extends to abut against the second limiting surface 61 of the locking member 6, the inner slider 312 cannot continue to move forward, thereby defining the safe stroke of the restraint member 4 through the second limiting surface 61 of the locking member 6.

[0146] When the covered stent 200 is adjusted to the target position, as Figures 13 to 15 shown, the distal end surface of the inner slider 312 may not reach the second limiting surface 61 of the locking member 6, but at least moves forward a certain distance. Of course, it can also directly move forward to abut against the second limiting surface 61. As Figures 16 to 18 shown, after the locking member 6 is removed, the rotary handle 311 and the inner slider 312 can move forward synchronously until the rotary handle 311 abuts against the connecting portion 331 of the intermediate connecting member 33, thereby quickly releasing the covered stent 200. At this time, the fixing cap may be completely withdrawn from the restraint member 4, or there may still be a part received within the restraint member 4.

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

[0148] In some embodiments of the present invention, as Figures 19 to 22 shown, in order to improve the structural stability of the rotary handle assembly 31, the intermediate connecting member 33 further includes a guide rod portion 332 connected to the proximal end of the connecting portion 331, and the rotary handle assembly 31 further includes a tail end cover 313. Among them, the tail end cover 313 is sleeved on the inner sheath core 11 on the proximal side of the rotating handle 311 and is disposed at 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 end cover 313.

[0149] It should be noted that the rotating handle 311 and the inner slider 312 are located between the connecting portion 331 of the intermediate connecting member 33 and the tail end cover 313 and can slide between the two. The tail end cover 313 can be connected to the guide rod portion 332 by connection methods such as threaded connection, snap connection, and bonding.

[0150] In addition, before the bare bracket 210 is separated 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, as Figures 19 to 22 shown, in order to realize the limiting function of the locking member 6 and the detachable connection with the intermediate connecting portion 331, the locking member 6 includes a locking sleeve 62 and a limiting rib 63. Among them, the locking sleeve 62 has a circumferential opening 621 and is fixedly sleeved on the connecting portion 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, as Figure 2 shown, when the locking member 6 is sleeved on the connecting portion 331, the proximal end surface of the limiting rib 63 is the above-mentioned second limiting surface 61, that is, when the distal end surface of the inner slider 312 abuts against the proximal end surface of the limiting rib 63, the locking member 6 can limit the further forward movement of the inner slider 312. Of course, the distal end surface of the limiting rib 63 can also be set as the second limiting surface 61 to facilitate the use of both ends of the locking member 6 by swapping.

[0153] As Figure 20 and Figure 22As shown, when the intermediate connecting member 33 further includes a guide rod portion 332 connected to the proximal end of the connecting portion 331, first insertion holes 64 and second insertion holes 65 are respectively defined between the opposite sides in the radial direction of the limiting rib 63 and the inner wall of the locking sleeve 62. Exemplarily, there are two guide rod portions 332, 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 turning handle assembly 31 further includes a tail end cover 313 sleeved on the inner sheath core 11 on the proximal side of the rotating handle 311 and arranged at the proximal end of the guide rod portion 332, the proximal end of the rotating handle 311 is sleeved on the distal end of the tail end cover 313, and the proximal end of the locking sleeve 62 is sleeved on the distal end.

[0155] Exemplarily, the locking sleeve 62 has a C-shaped structure and can be made of a material with elastic deformation ability such as plastic. It can be understood that the locking sleeve 62 can be elastically deformed and clamped on the connecting portion 331 of the intermediate connecting member 33.

[0156] In some embodiments of the present invention, as Figure 20 and Figure 22 shown, the axial length of the limiting rib 63 is less than the axial length of the locking sleeve 62, and both opposite ends of the limiting rib 63 in the axial direction do not protrude from the locking sleeve 62, so as to provide a longer axial adjustment stroke with a locking member 6 of a shorter length, which is beneficial to shortening the overall length of the conveyor 100.

[0157] In some embodiments of the present invention, as Figures 19 to 22 shown, a supporting rib 3131 protrudes from the distal end of the tail end cover 313 towards the inner slider 312. Among them, the supporting rib 3131 is mainly used for the proximal end of the rotating handle 311 to be rotatably sleeved. Exemplarily, the proximal end of the rotating handle 311 is sleeved on the supporting rib 3131 and can rotate relative to the supporting rib 3131, and the supporting rib 3131 can also support the rotating handle 311 from the inside to improve its rotation stability and smoothness.

[0158] And / or, in some embodiments of the present invention, as Figures 19 to 22 shown, when the locking member 6 is provided, a first transfer step 622 is recessed in the proximal end of the locking sleeve 62 of the locking member 6, and a second transfer step 3112 is recessed in the distal end of the rotating handle 311. Among them, the proximal end of the locking sleeve 62 is rotatably sleeved with the distal end of the rotating handle 311 through the concave-convex fit of the first transfer step 622 and the second transfer step 3112. Preferably, first transfer steps 622 are recessed in both the proximal end and the distal end of the locking sleeve 62 so that the locking sleeve 62 can be reversely sleeved on the rotating handle 311.

[0159] And / or, in some embodiments of the present invention, as Figures 19 to 22As shown, a support boss 3312 protrudes from the proximal end of the connecting portion 331 of the intermediate connecting member 33 towards the inner slider 312. The support boss 3312 is mainly used for the distal end of the rotary handle 311 to be rotatably sleeved thereon. Exemplarily, as Figure 18 shown, when the locking member 6 is removed and the rotary handle 311 and the inner slider 312 are moved forward together, the distal end of the rotary handle 311 can be directly sleeved on the support boss 3312 to be rotatably connected to the intermediate connecting member 33. Preferably, as Figure 21 and Figure 22 shown, a limiting groove 3313 is axially recessed in the support boss 3312. The bottom surface of the limiting groove 3313 can be the above-mentioned first limiting surface 3311. Again, as Figure 18 shown, after the locking member 6 is removed, the rotary handle 311 can be rotated to make the distal end surface of the inner slider 312 abut against the bottom surface of the limiting groove 3313 to ensure that the fixed anchor 5 is completely withdrawn from the restraint member 4.

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

[0161] In summary, compared with the prior art, the conveying system 1000 has at least the following beneficial effects: By adopting the above conveyor 100, the conveying system 1000 adds a half-release debugging process before the film covering bracket 200 is completely released, which is conducive to the operator adjusting the shape and position of the film covering bracket 200 in time according to the actual situation of the patient during the operation, thereby improving the success rate of the operation, ensuring the life safety of the patient, and also reducing the medical skill requirements for the operator.

[0162] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall 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. And under the adjustment of the conveying handle, relative axial movement can occur between the inner sheath core and the outer sheath core, and between the outer sheath tube and the sheath core assembly; Wherein, the sheath core assembly further includes a sleeve-shaped restraint and a fixing anchor. The restraint is sleeved outside the distal end of the inner sheath core and is relatively fixed to the inner sheath core; the fixing anchor is fixed to the distal end of the outer sheath core. During the relative axial 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 part of the fixing anchor can be inserted into the restraint, and the outer sheath tube can be sleeved outside the restraint; The fixing anchor includes a main body portion having a preset axial length and a plurality of anchor hooks provided on the outer wall of the main body portion 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 outer wall of the main body portion on the proximal side of each anchor hook; Before the fixing anchor is inserted into the restraint and the bare stent disengages from the anchor hook, during the relative axial movement of the inner sheath core and the outer sheath core, the restraint can radially compress the wave rod of the bare stent so that the wave rod can be re-received in the limiting groove, thereby driving the main body stent connected to the wave rod to be radially compressed.

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

3. The conveyor according to claim 1, wherein A groove communicating with the limiting groove is recessed on the outer wall of the main body portion, and the anchor hook protrudes from the bottom of the groove. The radial height of the bottom of the groove in the main body portion 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 by which the anchor hook deviates from the outer wall of the main body portion during the extension from the proximal end to the distal end of the main body portion is 70° to 90°; And / or, a limiting rib corresponding to each anchor hook is protruded on the outer wall of the main body portion on the proximal side of the anchor hook. The limiting ribs are circumferentially spaced apart and are located between two limiting grooves corresponding to the same anchor hook; And / or, each anchor hook corresponds to two limiting grooves, and the two limiting grooves are symmetrically arranged with respect to the center of the corresponding anchor hook; And / or, the distal end face of the main body portion is a guiding arc surface, and the included angle between the tangent of the guiding arc surface and the axis of the main body portion is an obtuse angle.

5. The conveyor according to any one of claims 1 to 3, characterized in that, The delivery handle includes a rotating handle assembly sleeved on the inner sheath core for driving the axial movement of the inner sheath core; wherein, the rotating handle assembly has a first axial movement distance and a second axial movement distance, and the second axial movement distance is greater than the first axial movement distance; within the range of the first axial movement distance, the fixed anchor is always at least partially inserted into the restraint, and the restraint has a radial restraint on the bare stent hooked on the fixed anchor; within the second axial movement distance, the restraint no longer has a radial restraint on the bare stent hooked on the fixed anchor, and the bare stent can be detached from the anchor hook.

6. The conveyor according to claim 5, characterized in that, A limiting step is provided on the outer wall of the main body portion, and the limiting step is used to abut against the proximal end of the restraint when the insertion section of the fixed anchor completely enters the restraint.

7. The conveyor according to claim 5, characterized in that, The delivery 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 side of the main handle; the rotating handle assembly is axially movably connected to the proximal end of the intermediate connecting member; The delivery device further includes a locking member detachably provided between the intermediate connecting member and the rotating handle assembly; when the locking member is located between the intermediate connecting member and the rotating handle assembly, the rotating handle assembly only has the first axial movement distance; after the locking member is removed from between the intermediate connecting member and the rotating handle assembly, the rotating handle assembly has the second axial movement distance.

8. The conveyor according to claim 7, wherein The intermediate connecting member includes a connecting portion connected to the proximal end of the main handle and having a first limiting surface at the proximal end; the rotating handle assembly includes a rotating handle sleeved on the inner sheath core on the proximal side of the connecting portion, and an inner slider fixedly sleeved on the inner sheath core and helically connected to the rotating handle within the rotating handle to drive the axial movement of the inner sheath core, and the maximum axial distance between the distal end surface 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, and when the locking member is detachably sleeved on the connecting portion of the intermediate connecting member, the maximum axial distance between the distal end surface of the inner slider and the second limiting surface close to the inner slider is the first axial movement distance.

9. The conveyor according to claim 8, wherein The intermediate connecting member further includes a guide rod portion connected to the proximal end of the connecting portion, and the rotating handle assembly further includes a tail end cover sleeved on the inner sheath core on the proximal side of the rotating handle and provided at the proximal end of the guide rod portion; The inner slider is slidably sleeved on the guide rod portion between the connecting portion and the tail end cover; Before the bare stent is detached from the anchor hook, the locking member is detachably connected to the guide rod portion between the connecting portion and the rotating handle.

10. The conveyor according to claim 8, characterized in that, The locking member includes a lock sleeve fixedly sleeved on the connecting portion and having a circumferential opening, and a limiting rib protruding from the inner wall of the lock 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 face; when the intermediate connecting member further includes a guide rod portion connected to the proximal end of the connecting portion, first insertion holes and second insertion holes for slidably inserting the guide rod portion are respectively defined between the opposite sides of the limiting rib in the radial direction and the inner wall of the lock sleeve; When the handlebar assembly further includes a tail end cover sleeved on the inner sheath core at the proximal side of the rotating handle and disposed at the proximal end of the guide rod portion, the proximal end of the rotating handle is sleeved on the distal end of the tail end cover, and the distal end of the rotating handle is sleeved on the proximal end of the lock sleeve.

11. The conveyor according to claim 10, wherein, The axial length of the limiting rib is less than the axial length of the lock sleeve, and both opposite ends of the limiting rib in the axial direction do not protrude from the lock sleeve.

12. The conveyor according to claim 10, wherein The distal end of the tail end cover protrudes toward the inner slider with a support rib for rotatably sleeving the proximal end of the rotating handle; and / or, the proximal end of the lock sleeve is recessed with a first transfer step, and the distal end of the rotating handle is recessed with a second transfer step that is in concave-convex fit with the first transfer step; and / or, the proximal end of the connecting portion of the intermediate connecting member protrudes toward the inner slider with a support boss for rotatably sleeving the distal end of the rotating handle.

13. A conveying system, characterized in that, The delivery system includes a membrane stent and a delivery device as claimed in any one of claims 1 to 12 for loading and releasing the membrane stent. The membrane stent includes a self-expanding main stent and a bare stent disposed at the distal end of the main stent. The bare stent at the distal end of the membrane stent can be hooked on the anchor hook of the fixed anchor; before the bare stent is disengaged from the anchor hook, the bare stent can drive the main stent of the membrane stent to be radially compressed under the constraint of the constraint member of the delivery device.

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