CN113893061A

CN113893061A - Medical device and conveyer

Info

Publication number: CN113893061A
Application number: CN202111514082.8A
Authority: CN
Inventors: 朱清; 赵明杰; 马明洁; 张博纬; 屠春霖; 朱永锋; 姚禹; 张军利; 陈伊璐
Original assignee: Shanghai Minimally Invasive Heart Pulse Medical Technology Group Co Ltd
Current assignee: Shanghai Minimally Invasive Heart Pulse Medical Technology Group Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-01-07

Abstract

The invention provides a medical device and a conveyor, wherein the medical device comprises a covered stent and a conveyor, wherein the covered stent comprises a stent body, a first rear release connecting piece and a slow release connecting piece; the first rear release connecting piece is arranged at the near end of the bracket body; the stent body is provided with a slow release area, the slow release area is arranged at the far end side of the first rear release connecting piece and corresponds to the first rear release connecting piece in the circumferential direction, and the slow release area is provided with a slow release connecting piece; the conveyor comprises a tube assembly and a first control member; loading the covered stent on the pipe assembly; the first control piece is connected with the stent body through the first rear release connecting piece and the slow release connecting piece, and applies radial inward tension to the proximal end of the stent body through the first rear release connecting piece and applies radial inward tension to the slow release area through the slow release connecting piece; when the covered stent is released, the first control piece is sequentially disconnected from the first post-release connecting piece and the slow-release connecting piece. When the medical device is used for the occlusion treatment of a bent blood vessel, the bird's beak phenomenon is effectively reduced.

Description

Medical device and conveyer

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical device and a conveyor.

Background

Thoracic aortic endoluminal repair (TEVAR) is an effective means of treating aortic dissection and has the advantages of less trauma, fewer complications and faster post-operative recovery of patients compared to traditional open thoracic surgery. The TEVAR mainly utilizes a covered stent to plug intimal lacerations at the near end of the aorta, improves the blood supply of a true lumen, enlarges the true lumen, reduces the pressure of a false lumen, induces the thrombosis of the false lumen, reduces the false lumen to tend to be blocked until the morphological remodeling of the blood supply of the aorta is completed.

Due to the uncertainty of the bending structure of the aortic arch part and the position of the intimal laceration, particularly for patients with sharp radian of the aortic arch, the covered stent is difficult to be tightly attached to the aortic wall. As shown in FIG. 1, the presence of a wedge-shaped gap 20 between the stent graft 10 and the small curve of the vessel wall resulting from the incomplete apposition of the proximal end of the stent graft 10 to the aortic wall is referred to as the "bird's beak" effect. Studies have shown that the occurrence and morphology of the "bird's beak" effect is significantly related to the occurrence of type Ia and type IIa endoleaks, and that patients with type Ia endoleaks or type IIa endoleaks all exhibit the "bird's beak" effect, and that the length of the "bird's beak" is significantly greater than that of patients without endoleaks.

Disclosure of Invention

The invention aims to provide a medical device and a conveyor, wherein when the medical device is applied to thoracic aorta intracavity repair, the bird's beak effect of a covered stent can be reduced or even eliminated, postoperative complications are reduced, and the treatment effect is improved.

To achieve the above object, the present invention provides a medical device comprising:

the covered stent comprises a stent body, a first rear release connecting piece and a slow release connecting piece; the first rear release connector is arranged at the proximal end of the stent body; the stent body is provided with a slow release area, the slow release area is positioned at the far end side of the first rear release connecting piece and is circumferentially arranged corresponding to the first rear release connecting piece, and the slow release area is provided with the slow release connecting piece;

a conveyor comprising a tube assembly and a first control member; the tube assembly is used for loading the covered stent; the first control element is movably connected with the tube assembly, the first control element is used for being connected with the stent body through the first rear release connecting piece and the slow release connecting piece and is configured for applying a radial inward pulling force to the proximal end of the stent body through the first rear release connecting piece and applying a radial inward pulling force to the slow release area through the slow release connecting piece; when the first control member is disconnected from the stent body, the first control member is configured to be disconnected from the first after-release connecting member first and then from the sustained-release connecting member.

Optionally, the stent graft is configured to be implanted in a target lumen, the target lumen having a curved section; the slow release region is a region where the stent body is abutted against the cavity wall of the curved section close to the curvature center when the covered stent is implanted into the target lumen.

Optionally, the stent body comprises a plurality of stent rings arranged at intervals along the axial direction of the stent body and a coating attached to the stent rings; the sustained release region is located distal to the one of the stent rings that is closest to the proximal end.

Optionally, the tube assembly comprises an inner tube and an outer tube movably sleeved outside the inner tube, and a space between the inner tube and the outer tube is used for loading the covered stent; the first control member is for being partially disposed between the stent graft and the inner tube.

Optionally, the first post-release connector comprises a first coil, and the slow-release connector comprises a second coil; the first control member includes a third coil connected to the inner tube and adapted to pass through the second coil, and a first control wire extending in an axial direction of the tube assembly, and a proximal end of the first control wire is adapted to pass through the third coil and the first coil to be connected with the first rear release connector and the sustained release connector.

Optionally, the first post-release connector comprises a first coil, and the slow-release connector comprises a second coil; the first control member comprises a first control guide wire extending along the axial direction of the tube assembly, and the proximal end of the first control guide wire is used for passing through the second coil and the first coil to be connected with the first rear release connector and the slow release connector.

Optionally, the inner tube comprises an inner tube body and at least one support part, the support part is arranged on the outer surface of the proximal end of the inner tube body, and a first guide wire channel extending in an axial direction is formed on the support part; the proximal end of the first control guidewire is also adapted to pass through the first guidewire channel.

Optionally, the inner tube further includes a top tube, the top tube is sleeved outside the inner tube body and located on a distal end side of the supporting portion, a proximal end of the top tube is used for abutting against a distal end of the covered stent, the top tube is further provided with a second guide wire channel extending axially through the top tube, and the second guide wire channel is used for penetrating through the first control guide wire.

Optionally, the conveyor further comprises a guide head, the guide head is arranged at the proximal end of the inner tube, and a first positioning blind hole is arranged on the guide head; the proximal end of the first control guide wire is used for being inserted into the first positioning blind hole.

Optionally, the stent graft further comprises a second rear release connector disposed at the proximal end of the stent body and circumferentially spaced from the first rear release connector; the transporter further includes a second control member for selectively connecting and disconnecting with the second rear release link, the second control member applying a radially inward pulling force to the proximal end of the stent body through the second rear release link when the second control member is connected with the second rear release link.

To achieve the above object, the present invention provides a delivery device for a medical device as described in any one of the preceding claims.

Compared with the prior art, the medical device and the conveyor have the following advantages: the medical device comprises a covered stent and a conveyor, wherein the covered stent comprises a stent body, a first rear release connecting piece and a slow release connecting piece; the first rear release connecting piece is arranged at the near end of the stent body, the stent body is provided with a slow release area, the slow release area is positioned at the far end side of the first rear release connecting piece and is circumferentially arranged corresponding to the first rear release connecting piece, and the slow release area is provided with the slow release connecting piece; the delivery device comprises a tube assembly and a first control element, wherein the tube assembly is used for loading the covered stent, the first control element is movably connected with the tube assembly, the first control element is used for being connected with the stent body through the first rear release connecting piece and the slow release connecting piece and is configured for applying a radial inward pulling force to the proximal end of the stent body through the first rear release connecting piece and applying a radial inward pulling force to the slow release area through the slow release connecting piece; when the first control member is disconnected from the stent body, the first control member is configured to be disconnected from the first after-release connecting member first and then from the sustained-release connecting member. The conveyor is used for conveying and releasing the covered stent to a target lumen, the target lumen is provided with a bent section, and in the process of releasing the covered stent, the first control part is sequentially disconnected with the first rear release connecting piece and the slow release connecting piece, so that the bird's beak effect can be effectively reduced or even avoided, and the treatment effect is improved.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention.

FIG. 1 is a schematic illustration of the bird's beak phenomenon that occurs when a stent graft is implanted in the aorta.

Fig. 2 is a schematic structural diagram of a medical device according to an embodiment of the present invention.

FIG. 3 is a schematic view of a stent graft of a medical device according to an embodiment of the present invention.

FIG. 4 is a schematic illustration of a delivery apparatus for a medical device according to an embodiment of the present invention.

Fig. 5 is a schematic view of a medical device according to an embodiment of the present invention in a use state, wherein the first control element is disconnected from the first post-release coupling but remains connected to the slow release coupling, and the top tube and the outer tube are not shown.

FIG. 6 is a schematic view of a stent graft of a medical device according to an embodiment of the present invention fully deployed within a target lumen.

In the drawings: 10, 1000-stent graft, 1100-stent body, 1101-first section, 1102-second section, 1103-third section, 1104-fourth section, 1110-sustained release region, 1120-stent ring, 1130-stent graft, 1200-first post-release connector, 1300-sustained release connector, 2000-transporter, 2100-tube assembly, 2110-inner tube, 2111-inner tube body, 2112-support section, 2112 a-first support section, 2112 b-second support section, 2113-first guide wire channel, 2114-top tube, 2115-second guide wire channel, 2120-outer tube, 2200-first control section, 2210-third coil, 2220-first control guide wire, 2300-guide head, 2310-first positioning blind hole, 20-bird's beak.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Herein, the terms "proximal" and "distal" are relative orientations, relative positions, and directions of elements or actions with respect to each other from the perspective of a clinician using a medical device, and although "proximal" and "distal" are not intended to be limiting, the term "distal" generally refers to the end of the medical device that is closer to the clinician during normal operation, and the term "proximal" generally refers to the end of the medical device that is first introduced into a patient.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

FIG. 1 shows a prior art stent graft 10 released in the aorta and forming a "bird's beak" at the proximal end of the aortic arch. The prior art stent graft 10 has a symmetrical tubular structure (i.e., a hollow cylindrical structure) in an initial state and has a certain bending strength. When the stent graft 10 is bent, the stent graft 10 accumulates stresses such that the proximal and distal ends of the stent graft 10 always have a tendency to return to a cylindrical configuration. The stress is referred to herein as the recoil force, and further, when the stent graft 10 is implanted in the aorta, the proximal end of the stent graft 10 is also the end thereof that is proximal to the heart, i.e., the proximal end.

When the stent graft 10 is delivered into the aorta and is partially positioned in the arch of the aorta, the stent graft 10 bends to conform to the vascular structure under the constraint of the aorta. Upon release of the proximal end of the stent graft 10, the proximal end of the stent graft 10 expands radially and springs open under the influence of the return force to tend to return the stent graft 10 to a cylindrical configuration such that the A of the proximal end of the stent graft 10 is adjacent the major curve of the aorta₂The points may conform to the greater curvature of the vessel wall while the A of the proximal end of the stent graft 10 is adjacent to the lesser curvature of the aorta₁Point then willDeviated from the minor curvature of the aorta and unable to conform to the minor curvature of the vessel wall, forming a "bird's beak". Here, the major curve side refers to a side of a blood vessel wall of the aorta from which three branch arteries (not shown) issue, and the minor curve side is a side opposite to the major curve side, and the minor curve side is closer to the center of curvature of the arch portion than the major curve side.

In view of the above, as shown in FIG. 2, an embodiment of the present invention provides a medical device comprising a stent graft 1000 and a delivery device 2000, wherein the delivery device 2000 is used for delivering and releasing the stent graft 1000 into the aorta so that the stent graft 1000 is partially located at the arch and the "bird's beak" phenomenon is effectively reduced or even eliminated. That is, the medical device may be used for thoracic aortic endoluminal repair (TEVAR), but it will be understood by those skilled in the art that the medical device may also be applied to the occlusion treatment of other target lumens having a curved section and in which a lesion occurs, and for this type of target lumen, the minor curve refers to a side wall of the target lumen that is close to the center of curvature of the curved section, and the major curve refers to a side wall of the target lumen that is opposite to the relatively minor curve. The medical device is described herein for use in TEVAR, for example, and those skilled in the art can modify the description to accommodate other occlusion treatments of a target lumen.

With continued reference to fig. 2 in conjunction with fig. 3 and 4, the stent graft 1000 includes a stent body 1100, a first post-release connector 1200, and a slow-release connector 1300. The first rear release connector 1200 is disposed at the proximal end of the stent body 1100, the stent body 1100 is provided with a slow release region 1110, the slow release region 1110 is located at the distal end of the first rear release connector 1200 and is circumferentially disposed corresponding to the first rear release connector 1200, and the slow release region 1110 is provided with the slow release connector 1300. The transporter 2000 includes a tube assembly 2100 and a first control member 2200, wherein the tube assembly 2100 is used to load the stent graft 1000 and the first control member 2200 is movably coupled to the tube assembly 2100. The first control part 2200 is further configured to be connected to the stent body 1100 through the first rear release link 1200 and the sustained release connecting part 1300, and configured to apply a first radially inward pulling force to the proximal end of the stent body 1100 through the first rear release link 1200 and apply a second radially inward pulling force to the sustained release zone 1110 through the sustained release connecting part 1300. When the first control member 2200 is disconnected from the stent body 1100, the first control member 2200 is configured to be disconnected from the first after-release link 1200 and then from the slow-release link 1300. When the first control member 2200 is disconnected from the first rear release link 1200, since the first control member 2200 is also connected to the slow release link 1300, the degree of forward movement of the stent body 1100 due to the back-straight force is reduced or even eliminated, and when the first control member 1200 is connected to the slow release link 1300, the supporting force given to the stent by the target lumen prevents the stent from continuously releasing the back-straight force, so that the arc length of the stent on the small curve side can be reduced or even eliminated, and the bird's beak phenomenon can be reduced or even eliminated.

Here, the sustained release region 1110 is a region where the stent body 1100 is located at the arch and abuts against the lesser curvature when the stent graft 1000 is implanted in the aorta and partially located at the arch. In the circumferential direction, the stent body 1100 may be divided into a first portion 1101, a second portion 1102, a third portion 1103 and a fourth portion 1104, wherein the first portion 1101 is disposed opposite to the third portion 1103, the second portion 1102 is disposed opposite to the fourth portion 1104, the first portion 1101 is configured to abut against a major curved side of the aorta, and the third portion 1103 is configured to abut against a minor curved side of the aorta. The sustained-release region 1110 and the first rear release connector 1200 are circumferentially disposed correspondingly, which means that both the sustained-release region 1110 and the first rear release connector 1200 are disposed on the third portion 1103. As known to those skilled in the art, the stent body 1100 includes a plurality of stent rings 1120 and a cover 1130, the number of the stent rings 1120 is plural, the plurality of stent rings 1120 are coaxially and alternately arranged, and the cover 1130 is attached to the stent rings 1120 by thermal fusion bonding, suture or any other suitable means. The sustained release region 1110 may be located on the distal side of the one of the stent rings 1120 that is closest to the proximal end.

The tubular assembly 2100 of the delivery instrument 2000 may include an inner tube 2110 and an outer tube 2120 mounted around the outside of the inner tube 2110, the outer tube 2120 being configured for axial relative movement with respect to the inner tube 2110. As shown in fig. 5 and 6, when the medical device is executing TEVAR, the stent graft 1000 is sleeved on the outer surface of the proximal end of the inner tube 2110 and compressed by the outer tube 2120 during the delivery process, and the first control member 2200 is partially disposed between the stent graft 1000 and the inner tube 2110 and connected to the first rear release connector 1200 and the sustained release connector 1300.

After the delivery apparatus 2000 delivers the stent graft 1000 to the target site (i.e., the stent graft 1000 is partially positioned at the arch to bend the stent graft 1000), the outer tube 2120 is first controlled to move in a proximal-to-distal direction relative to the inner tube 2110 to expose the stent graft 1000 from the proximal end of the outer tube 2120. At this time, the distal end of the stent body 1100 is no longer radially constrained to radially expand and conform to the vessel wall, and the proximal end of the third portion 1103 of the stent body 1100 tends to radially expand, so that the first control member 2200 applies the first pulling force to the proximal end of the third portion 1103 through the first rear release link 1200, so that the proximal end of the third portion 1103 is constrained from expanding under the first pulling force. Similarly, the sustained release region 1200 has a tendency to radially expand, and the first control member 2200 applies the second pulling force to the sustained release region 1110 through the sustained release link 1300 such that the sustained release region 1110 is restrained from expanding. Next, the first control member 2200 is disconnected from the first rear release link 1200 to release the proximal end of the third portion 1103. Due to the straightening force, the proximal end of the third portion 1103 tends to move forward (i.e., in the direction of the heart) and away from the small curve side of the vessel wall, but under the second pulling force, the coating 1130 on the proximal side of the sustained release region 1110 is pulled and in a wrinkled (or folded) state, reducing the distance the proximal end of the third portion 1103 moves forward and reducing the chord length of the third portion 1103 at the arch, so that the proximal end of the third portion 1103 abuts against the small curve side of the vessel wall. Finally, the connection of the first control member 2200 to the slow release connection piece 1300 is released, and since the proximal end of the third portion 1103 has already been in abutment with the small curve of the vessel wall, the release of the straightening force can be resisted by the supporting force from the small curve, reducing or even avoiding the formation of a "bird's beak".

Referring back to fig. 3, in the first embodiment of the present invention, the first rear release connector 1200 includes a first coil, which may be directly sewn to the stent body 1100. The sustained-release connector 1300 includes a second coil, which may be directly sewn to the sustained-release region 1110, or the sustained-release connector 1300 further includes a connection string (not shown) having one end sewn to the sustained-release region 1110 and the other end connected to the second coil. The first control member 2200 comprises a first control wire, the proximal end of which is adapted to pass through the second coil to make connection with the slow release connector 1300, and the proximal end of which is further adapted to pass through the first coil to make connection with the first post-release connector 1200 (not shown). In this embodiment, since the second pulling force applied by the first control guide wire is larger, the second coil needs to have a larger size (when the second coil is directly sewed on the sustained-release region 1110) or the connection cord needs to be longer (when the second coil is sewed on the sustained-release region 1110 through the connection cord) so as to avoid the second coil from being broken by the second pulling force. However, in practice, the size of the sustained-release connector 1300 should be as small as possible (i.e., the second coil should be as small as possible when the second coil is directly sutured to the sustained-release region 1110, and the connection string should be as short as possible and the second coil should be as small as possible when the second coil is sutured to the sustained-release region 1110 via the connection string), because the greater the size of the sustained-release connector 1300 is, the greater the possibility of causing thrombus when the stent graft 1000 is implanted in the aorta, the more the sustained-release connector 1300 is suspended in the blood vessel and impacted by the blood flow.

In view of this, in the second embodiment of the present invention, the first control member 2200 includes a third coil 2210 and a first control wire 2220. The third coil 2210 is connected to the inner tube 2110 with the third coil 2110 adapted to pass through the second coil, the first control wire 2220 extends axially of the tube assembly 2100 with the proximal end of the first control wire 2220 adapted to pass through the third coil 2110 to make a connection with the slow release connection 1300, and the proximal end of the first control wire 2220 adapted to pass through the first coil to make a connection with the first post-release connection 1200. In this embodiment, the third coil 2210 actually serves as a buffer member, reducing the amount of the second tensile force applied to the second coil by the first control wire 2220, so that the second coil is not broken due to excessive force even if the size of the second coil is small or the connection cord is short.

In some embodiments, the number of the first post-release linkage 1200 and the slow-release linkage 1300 is one, and correspondingly, the number of the first control wires 2220 is also one. In other embodiments, the number of the first post-release connectors 1200, the slow-release connectors 1300, and the first control guidewire 2220 is two or more, and the proximal end of each first control guidewire 2220 is used for connecting with one of the first post-release connectors 1200 and one of the slow-release connectors 1300.

Preferably, the inner tube 2110 includes an inner tube body 2111 and at least one support portion 2112, the support portion 2112 is disposed on a proximal outer surface of the inner tube body 2111, and the support portion 2112 is further formed with a first guide wire channel 2113 extending axially therethrough. The proximal end of the first control guidewire 2220 is used to pass through the first guidewire channel 2113 to effect connection with the tube assembly 2100. In this embodiment, the number of the support portions 2112 is two, the two support portions 2112 are referred to as a first support portion 2112a and a second support portion 2112b, and the first support portion 2112a and the second support portion 2112b are sequentially arranged at intervals in the axial direction of the inner tube body 2111 in the proximal-to-distal direction. The third coil 2210 is connected to the second support portion 2112b, and the proximal end of the first control wire 2220 is passed through the first wire passage 2113 in the second support portion 2112b, the third coil 2210, the first wire passage 2113 in the first support portion 2112a, and the first coil in this order. Further, the inner tube 2110 further includes a top tube 2114, the top tube 2114 is sleeved outside the inner tube main body 2111 and is located at the distal end side of the supporting portion 2112, and the proximal end of the top tube 2114 is used for abutting against the distal end of the stent graft 1000. The top tube 2114 is further provided with a second guide wire channel 2115 extending axially through the top tube 2114, and the second guide wire channel 2115 is used for penetrating the first control guide wire 2220. By providing the supporting portion 2112 and the top tube 2114, and providing the first wire guide channel 2113 and the second wire guide channel 2115, on one hand, the first control wire 2220 can be prevented from being folded at the distal end or the proximal end, and on the other hand, when the supporting portion 2112 is provided with a plurality of first wire guide channels 2113 arranged at intervals along the circumferential direction of the inner tube body 2111, and the first control member 2200 includes a plurality of first control wires 2220, when each first control wire 2220 passes through one first wire guide channel 2113, the plurality of first control wires 2220 can be effectively isolated, and the plurality of first control wires 2220 can be prevented from being wound.

Further, the delivery device 2000 further comprises a guide head 2300, wherein the guide head 2300 is of a generally conical structure, and the guide head 2300 is connected to the distal end of the inner tube 2110 and serves as a guide to facilitate the delivery device 2000 to travel in the blood vessel. A first positioning blind hole 2310 is formed in the seeker 2300, and the proximal end of the first control guide wire 2220 is inserted into the first positioning blind hole 2310 after passing through the first coil. Preferably, the first guide wire channel 2113, the second guide wire channel 2115 and the first positioning blind hole 2310 for passing the same first control guide wire 2220 are coaxially arranged.

In addition, the stent graft 1000 may further include at least one second rear release connector (not shown), which may include a fourth coil disposed at the proximal end of the stent body 1100 and circumferentially spaced from the first coil, i.e., the fourth coil may be disposed at least one of the proximal end of the first portion 1101, the proximal end of the second portion 1102, and the proximal end of the fourth portion 1103 of the stent body 1100. The transporter 2000 further includes a second control (not shown), such as a second control wire, having a proximal end for passing through the fourth coil and for applying a third pulling force to one of the proximal end of the first portion 1101, the proximal end of the second portion 1102, and the proximal end of the third portion 1103 of the stent body 1100 via the fourth coil.

Correspondingly, a third guide wire channel (not shown in the figure) can be arranged on the supporting portion 2112, a fourth guide wire channel (not shown in the figure) can be arranged on the top tube 2114, and a second positioning blind hole (not shown in the figure) can be arranged on the guide head 2300, and the proximal end of the second control guide wire is used for passing through the fourth guide wire channel, the third guide wire channel and the fourth coil and finally being inserted into the second positioning blind hole. And the third guide wire channel, the fourth guide wire channel and the second positioning blind hole for the same second control guide wire to penetrate through are preferably coaxially arranged.

The specific method of the transporter 2000 in releasing the stent graft 1000 is described next with reference to FIGS. 5 and 6.

First, the outer tube 2120 is controlled to move proximally and distally relative to the inner tube 2110 to fully expose the stent graft 2000 from the outer tube 2120 (shown in FIG. 5).

The first control guidewire 2220 and the second control guidewire are then withdrawn to disconnect the first control guidewire 2220 from the first rear release link 1200 and the second control guidewire from the second rear release link.

Thereafter, the first control wire 2220 is withdrawn further to decouple the first control wire 2220 from the slow release linkage 1300 to complete the release of the stent graft 1000, and no "bird's beak" is formed (as shown in FIG. 6) or a smaller bird's beak is formed (not shown) between the proximal end of the stent graft 1000 and the small curve of the vessel wall.

Further, the embodiment of the present invention further provides a conveyor, which is the aforementioned conveyor 2000.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A medical device, comprising:

2. The medical device of claim 1, wherein the stent graft is configured to be implanted in a target lumen, the target lumen having a curved section; the slow release region is a region where the stent body is abutted against the cavity wall of the curved section close to the curvature center when the covered stent is implanted into the target lumen.

3. The medical device of claim 1 or 2, wherein the stent body comprises a plurality of stent rings arranged at intervals along an axial direction of the stent body and a cover attached to the stent rings; the sustained release region is located distal to the one of the stent rings that is closest to the proximal end.

4. The medical device of claim 1, wherein the tube assembly comprises an inner tube and an outer tube movably disposed outside the inner tube, a space between the inner tube and the outer tube for loading the stent graft; the first control member is for being partially disposed between the stent graft and the inner tube.

5. The medical device of claim 4, wherein the first post-release connector comprises a first coil, and the sustained release connector comprises a second coil; the first control member includes a third coil connected to the inner tube and adapted to pass through the second coil, and a first control wire extending in an axial direction of the tube assembly, and a proximal end of the first control wire is adapted to pass through the third coil and the first coil to be connected with the first rear release connector and the sustained release connector.

6. The medical device of claim 4, wherein the first post-release connector comprises a first coil, and the sustained release connector comprises a second coil; the first control member comprises a first control guide wire extending along the axial direction of the tube assembly, and the proximal end of the first control guide wire is used for passing through the second coil and the first coil to be connected with the first rear release connector and the slow release connector.

7. The medical device according to claim 5 or 6, wherein the inner tube comprises an inner tube body and at least one support portion, wherein the support portion is arranged on the outer surface of the proximal end of the inner tube body, and a first guide wire channel extending in an axial direction is formed on the support portion; the proximal end of the first control guidewire is also adapted to pass through the first guidewire channel.

8. The medical device of claim 7, wherein the inner tube further comprises a top tube, the top tube is sleeved outside the inner tube body and located on the distal side of the supporting portion, the proximal end of the top tube is used for abutting against the distal end of the stent graft, the top tube is further provided with a second guide wire channel extending axially through the top tube, and the second guide wire channel is used for penetrating the first control guide wire.

9. The medical device of claim 5 or 6, wherein the delivery device further comprises a guide head, wherein the guide head is arranged at the proximal end of the inner tube, and a first positioning blind hole is arranged on the guide head; the proximal end of the first control guide wire is used for being inserted into the first positioning blind hole.

10. The medical device of claim 1, wherein the stent graft further comprises a second rear release connector disposed at the proximal end of the stent body and circumferentially spaced from the first rear release connector; the transporter further includes a second control member for selectively connecting and disconnecting with the second rear release link, the second control member applying a radially inward pulling force to the proximal end of the stent body through the second rear release link when the second control member is connected with the second rear release link.

11. A delivery device, wherein the delivery device is a delivery device for a medical device according to any of claims 1-10.