An implant delivery system

Abstract

This invention relates to the technical field of medical devices, and more particularly to an implant delivery system. The implant delivery system includes an implant and a delivery device. The implant includes a first tubular member and a second tubular member, the distal portion of which is housed within the first tubular member such that the outer wall of the second tubular member engages with the inner wall of the first tubular member to form an openable or closable channel. The delivery device includes a sheath core, an outer sheath, and a restraint assembly. The compressed implant is housed within the outer sheath, which is slidable relative to the sheath core to release the implant. The restraint assembly is connected to the second tubular member and is used to detachably restrain the distal end of the second tubular member into a compressed state to open the channel when the first tubular member is in a radially extended state. In this implant delivery system, the channel can be fully opened under the action of the delivery device, thereby facilitating the establishment of a branch stent implantation path.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices, and more particularly to an implant delivery system. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Aortic dissection, also known as aortic aneurysm, is caused by a tear in the aortic intima due to various reasons, allowing blood to flow into the aortic wall and causing it to separate into layers, forming a hematoma. Aortic dissection is a serious vascular disease that threatens life and health, with a high mortality rate.

[0004] Currently, there are two main treatment methods for aortic dissection: surgical treatment and minimally invasive treatment. Surgical treatment involves open-chest and open-abdomen surgery to remove the tear in the intima and reconstruct the blood flow pathway using an artificial vascular graft. Minimally invasive interventional treatment, on the other hand, involves implanting a endovascular stent graft at the lesion site to isolate the blood flow from the aortic dissection while maintaining normal blood flow. Compared to surgical treatment, minimally invasive interventional treatment is increasingly being used in routine care due to its advantages such as less trauma, faster recovery, and fewer complications.

[0005] Generally, covered stents are straight-tube stents. However, when the aortic dissection involves or is close to branch vessels, such as when the aortic dissection involves or is close to the coronary arteries, the aortic arch branches, or the abdominal aorta is close to the renal arteries, the covered stent may cover or obstruct the openings of branch vessels, coronary vessels, or renal arteries in order to cover the lesion or to increase the anchoring area. In such cases, it is usually necessary to implant both a main stent and a branch stent (or bypass stent) at the lesion site for treatment. The main stent and the branch stent work together to maintain blood flow in the aorta and branch vessels.

[0006] Generally, the implantation procedure is performed as follows: first, the main stent is delivered to the appropriate site; then, the main stent is partially deployed; next, a branch stent is delivered to the appropriate site, and then the branch stent is deployed to engage with the main stent; finally, the main stent is fully deployed to complete the procedure. This process means that during the deployment of the branch stent, because the main stent is still in the blood vessel and partially deployed, it may obstruct blood flow to some extent. If the deployment of the branch stent takes too long, the blood flow obstruction will also be prolonged, which can adversely affect the patient's health and, in severe cases, even endanger their life.

[0007] Currently, researchers have modified the main stent to ensure blood flow during the implantation of branch stents. This modification involves creating an opening that can be opened and closed, dividing the main stent into proximal and distal portions. During implantation, the distal portion is released while the proximal portion is compressed using a sheath, opening the opening to maintain blood flow or allow for the implantation of the branch stent. However, this structure has a drawback: due to the self-expanding nature of the main stent, the portion not bound by the sheath tends to expand circumferentially when the opening is opened, preventing the opening from fully opening. This makes it difficult to establish the implantation path for the branch stent, as the guidewire can easily enter the sheath along the inner wall of the incompletely expanded portion of the main stent, creating an incorrect path and increasing the difficulty of establishing the branch stent implantation path. Summary of the Invention

[0008] Therefore, it is necessary to provide an implant delivery system that can reduce the difficulty of establishing a branch stent implantation path.

[0009] An implant delivery system includes: an implant comprising a first tubular member and a second tubular member, the first tubular member having a first cavity and the second tubular member having a second cavity, the first tubular member being connected to the second tubular member, and a distal portion of the second tubular member being accommodated within the first tubular member such that the outer wall of the second tubular member engages with the inner wall of the first tubular member to form an openable or closable channel; and a delivery device comprising a sheath core, an outer sheath tube, and a restraint assembly, the outer sheath tube being hollow and sleeved outside the sheath core, the outer sheath tube forming an open loading cavity between the sheath core and the sheath tube, the loading cavity being for accommodating the compressed implant, the outer sheath tube being slidable relative to the sheath core to release the implant, and the restraint assembly being connected to the second tubular member, the restraint assembly being used to detachably restrain the distal end of the second tubular member into a compressed state to open the channel when the first tubular member is in a radially extended state.

[0010] In one embodiment, the restraint assembly includes a bolt and a cord, the bolt extending in the same direction as the sheath core, the bolt being axially movably housed within the outer sheath and movably connected to the cord; in the loaded state, the cord detachably binds the distal end of the second tubular member to the sheath core in the radial direction; when the cord is connected to the bolt, the cord binds the distal end of the second tubular member; when the cord is separated from the bolt, the cord's binding on the second tubular member disappears.

[0011] In one embodiment, the distal end of the second tubular member is provided with at least one restraining ring, through which the tether passes and is tightened to detachably radially bind the distal end of the second tubular member to the sheath core.

[0012] In one embodiment, the tether is folded in half to form a sleeve end and an open end. The sleeve end is sleeved on the tether rod, and the open end extends along the sheath core to the outside of the conveyor after passing through at least one constraint ring in sequence.

[0013] In one embodiment, the tether includes two free ends and at least one folding portion disposed between the two free ends. The folding portion corresponds one-to-one with the constraint ring. The folding portion passes through the constraint ring and is sleeved on the tether rod. The free ends extend along the sheath core to the outside of the conveyor. Alternatively, when the number of constraint rings is even, the number of folding portions is half that of the constraint rings, and each of the two ends of the folding portion is fitted with a constraint ring.

[0014] In one embodiment, the constraint assembly further includes a constraint control element connected to both the bolt rod and the bolt rope, the constraint control element being used to control the bolt rod and the bolt rope to move axially toward the proximal end of the conveyor.

[0015] In one embodiment, the constraint control component includes: a mounting base disposed near the proximal end of the sheath core, wherein the mounting base has a bolt rod mounting hole through which the bolt rod passes and a bolt rope mounting hole through which the bolt rope passes; a bolt rod release key engaged with the mounting base and connected to the proximal end of the bolt rod, wherein when the bolt rod release key is separated from the mounting base, it can drive the bolt rod to move axially away from the mounting base; and a bolt rope release key engaged with the mounting base and connected to the open end or a free end of the bolt rope, wherein when the bolt rope release key is separated from the mounting base, it can drive the bolt rope to move axially away from the mounting base.

[0016] In one embodiment, the conveyor further includes an outer sheath drive assembly for driving the outer sheath to slide axially relative to the sheath core. The outer sheath drive assembly includes: a slide rail extending in the axial direction; a base connected to the proximal end of the slide rail, the sheath core passing through the slide rail and the proximal end of the sheath core being connected to the base; and a drive member slidably assembled with the slide rail, the outer sheath passing through the slide rail and the proximal end of the outer sheath tube being connected to the drive member. The drive member slides along the slide rail to drive the outer sheath to slide relative to the sheath core.

[0017] In one embodiment, the slide rail is a hollow tube with an axially extending sliding hole on its side wall. The driving component includes a sliding part, an operating part, and a connecting key. The sliding part is housed within the slide rail and connected to the outer sheath. The operating part is located outside the slide rail. One end of the connecting key is connected to the sliding part, and the other end extends from the sliding hole and is connected to the operating part.

[0018] In one embodiment, the proximal end of the second tubular member is further provided with a hook portion, and the conveyor further includes a hook member, which is fixed on the sheath core and detachably connected to the hook portion. When the hook portion is housed in the loading cavity, the hook member is connected to the hook portion, and when the hook portion is located outside the outer sheath tube, the hook member is disconnected from the hook portion.

[0019] In one embodiment, the hooking part is a hooking ring, the hooking member is a hooking block, the hooking block has a receiving groove on its side wall, and a positioning post is provided in the receiving groove. The hooking ring is sleeved on the positioning post and received in the receiving groove. When the opening of the receiving groove is covered by the outer sheath tube, the hooking member is connected to the hooking part. When the opening of the receiving groove is not covered by the outer sheath tube, the connection between the hooking member and the hooking part is broken.

[0020] In one embodiment, the implant delivery system further includes a branch support, one end of which can be inserted into the channel when the channel is open, and the branch support is clamped by the first tubular member and the second tubular member when the channel is closed.

[0021] The implant delivery system provided in this application embodiment has an openable and closable channel formed by the inner wall of the first tubular member and the outer wall of the second tubular member. When the implant is fully housed in the loading cavity, both the first and second tubular members are compressed, and the channel is closed. When the outer sheath is retracted, the first tubular member is released into an unfolded state, while the second tubular member remains compressed due to the restraint assembly, thus opening the channel. This allows the guidewire to extend more easily from the channel, avoiding the situation where the distal end of the second tubular member tends to unfold when the first tubular member is in the released state, causing the guidewire to extend from the inside of the second tubular member and resulting in implantation path establishment failure. This reduces the difficulty of establishing the branch stent implantation path and effectively shortens the implantation surgery time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] in:

[0024] Figure 1 This is a schematic diagram of an implant delivery system according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of an implant according to an embodiment of the present invention;

[0026] Figure 3 for Figure 2 The image shows a cross-sectional view of the implant with the channel open, cut along the axial direction.

[0027] Figure 4 This is a partial structural schematic diagram of an implant delivery system according to an embodiment of the present invention in the channel open state;

[0028] Figure 5 This is a schematic diagram of a portion of the structure of an implant according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a portion of the structure of an implant delivery system according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the assembly of the constraint component and the constraint ring according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram illustrating the degree of channel opening of an implant in an unconstrained state according to an embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram illustrating the degree of channel opening of an implant in a constrained state according to an embodiment of the present invention;

[0033] Figure 10 This is a cross-sectional view of a conveyor according to an embodiment of the present invention;

[0034] Figure 11 This is an exploded view of a conveyor according to an embodiment of the present invention;

[0035] Figure 12 for Figure 10 Enlarged view of section A;

[0036] Figure 13 for Figure 10 A magnified view of section B. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In the field of interventional medical devices, the end of a medical device implanted in the human or animal body that is closer to the operator is generally called the "proximal end," and the end that is farther from the operator is called the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of a medical device are defined. "Axial direction" generally refers to the length of the medical device during delivery, while "radial direction" generally refers to the direction of the medical device that is not parallel to its "axial direction." Based on this principle, the "axial direction" and "radial direction" of any component of a medical device are defined. "Circumferential direction" refers to the circumferential direction, that is, the axial direction surrounding a tubular structure or cylinder.

[0041] Please see Figure 1 An embodiment of the present invention provides an implant delivery system, including an implant 1 and a delivery device 2. The implant 1 is suitable for being implanted into human tissue to treat lesions. The implant 1 is loaded in the delivery device 2 and delivered to the lesion site by the delivery device 2 and then released in stages. After release, the implant 1 is anchored on the lesion site and plays a therapeutic role.

[0042] Please see Figure 1-4 In one embodiment, the implant 1 includes a first tubular member 11 and a second tubular member 12. The delivery device 2 includes a sheath core 21, an outer sheath 22, and a restraint assembly 23.

[0043] Among them, such as Figure 2-4 A first tubular member 11 has a first cavity 110, and a second tubular member 12 has a second cavity 120. The second tubular member 12 is connected to the first tubular member 11, and the second tubular member 12 is partially housed within the first tubular member 11. The outer wall of the second tubular member 12 and the inner wall of the first tubular member 11 cooperate to form an openable or closable channel 13. When the first tubular member 11 is fully extended and the second tubular member 12 is compressed, the inner wall of the first tubular member 11 separates from the outer wall of the second tubular member 12, and the channel 13 opens. When both the first tubular member 11 and the second tubular member 12 are fully extended, the inner wall of the first tubular member 11 fits against the outer wall of the second tubular member 12, and the channel 13 closes.

[0044] like Figure 1 As shown, the sheath core 21 provides support and can support the implant 1. The outer sheath tube 22 is a hollow tube that is sleeved on the outside of the sheath core 21, forming a loading cavity 220 between the outer sheath tube 22 and the sheath core 21 (see...). Figure 10 The loading cavity 220 is used to accommodate the compressed implant 1. The restraint assembly 23 is connected to the second tubular member 12 and is used to detachably restrain the distal end of the second tubular member 12 into a compressed state to open the channel 13 when the first tubular member 11 is in a radially extended state.

[0045] In the implant delivery system provided in the above embodiment, when the implant 1 is in the delivery state, the implant 1 is compressed and fitted onto the sheath core 21, and the second tubular member 12 is at least distally restrained by the restraint component 23 before being housed together with the first tubular member 11 in the outer sheath 22. When the implant 1 is delivered to the lesion site, by controlling the outer sheath 22 to slide proximally relative to the sheath core 21, a state can be formed in which only the first tubular member 11 is released while the proximal portion of the second tubular member 12 that does not extend into the first tubular member 11 remains housed in the outer sheath 22 and is not released. In the state where the distal end of the second tubular member 12 is not radially compressed, the distal portion of the second tubular member 12 housed in the first tubular member 11 is subjected to the synergistic effect of the first tubular member 11 and the outer sheath 22, so that the channel 13 is opened to a certain extent but not fully opened. To further open the channel 13 and facilitate the establishment of the implantation path, the distal end of the second tubular member 12 (i.e., the portion of the second tubular member 12 housed within the first tubular member 11) is radially compressed by the constraint component 23. This allows the channel 13 to be fully open under the combined action of the constraint component 23 and the outer sheath 22. The fully open channel 13 facilitates the establishment of the branch stent implantation path, preventing the guidewire from extending from the distal end of the second tubular member 12 into the second lumen 120, which could lead to implantation failure and effectively shorten the procedure time. Furthermore, it allows for smoother blood flow through the channel 13 along the first lumen 110, or vice versa, ensuring optimal blood flow during stent implantation and preventing adverse effects on the patient's health due to blood flow obstruction.

[0046] It is understood that the first tubular member 11 and the second tubular member 12 can be directly connected or indirectly connected through other components. The first tubular member 11 and the second tubular member 12 can be coaxial or non-coaxial. The channel 13 can be an annular channel, thereby making blood flow smoother and more effective. There can also be multiple channels 13, and the multiple channels 13 are arranged at intervals along the circumference of the second tubular member 12. The channel 13 can also be a non-annular channel.

[0047] It is also understandable that the sheath core 21 has an internal hollow structure, allowing the guide wire guiding the implant 1 to pass through the sheath core 21 to establish an insertion path. Additionally, a tip with a double-conical tip is provided at the distal end of the sheath core 21. This tip ensures smooth advancement of the sheath core 21 within the tissue and prevents it from scraping against the structures within the tubular component 1 after its release. The tip can be fixed to the sheath core 21 by adhesive bonding, threaded connection, or other methods.

[0048] It is also understood that in other embodiments, the constraint component 23 may also constrain the entire second tubular member 12. The length of the constraint component 23 axially constraining the second tubular member 12 may be unlimited, as long as the constraint component 23 constrains at least the distal end of the second tubular member 12 to achieve the purpose of causing the channel 13 to be fully opened.

[0049] Please continue reading. Figure 2-4 In one embodiment, the first tubular member 11 includes a first film-coated support 111 and a connector 112, and the second tubular member 12 includes a second film-coated support 121 and a sealing assembly 122.

[0050] The first cavity 110 is formed on the first covered support 111, and the second cavity 120 is formed on the second covered support 121. The distal end of the connector 112 is connected to the proximal end of the first covered support 111, and the proximal end of the connector 112 is connected to the distal end of the second covered support 121. The connector 112 is used to connect the first covered support 111 and the second covered support 121. The proximal end of the sealing assembly 122 is connected to the second covered support 121, and the distal end extends axially away from the second covered support 121 to be at least partially accommodated within the first cavity 110. The portion of the sealing assembly 122 accommodated within the first cavity 110 has an annular structure and a free end. This annular structure surrounds the longitudinal central axis of the first covered support 111. The sealing assembly 122 can expand or contract synchronously with the second covered support 121. The channel 13 is formed by the outer wall of the portion of the sealing assembly 122 accommodated within the first cavity 110 mating with the inner wall of the first covered support 111. When the first covered support 111 is radially extended and the second covered support 121 is radially compressed, the outer wall of the sealing component 122 is spaced from the inner wall of the first covered support 111, and the channel 13 is open and connected to the first cavity 110. When both the first covered support 111 and the second covered support 121 are radially extended, the outer wall of the sealing component 122 is in contact with the inner wall of the first covered support 111, and the channel 13 is closed.

[0051] It is understood that in this embodiment, the first covered stent 111 and the second covered stent 121 are connected by the connector 112, allowing the expansion or contraction movements of the first covered stent 111 and the second covered stent 121 to proceed independently without interfering with each other. This facilitates and quickly opens the channel 13, rapidly ensuring unobstructed blood flow and shortening the surgical time. Furthermore, the connector 112 allows the channel 13 to open to its maximum extent, further guaranteeing unobstructed blood flow. In other embodiments, the connector 112 can be omitted, allowing the distal end of the first covered stent 111 and the proximal end of the second covered stent 121 to be directly connected by point connections. That is, the connection points (connection sites) between the first covered stent 111 and the second covered stent 121 are multiple discrete points (sites) and are not completely closed circumferentially. For example, point connections can be formed by suturing.

[0052] Furthermore, in this embodiment, by providing a sealing component 122, and having the sealing component 122 cooperate with the first covered stent 111 to form a channel 13, the restrictions on the radial dimension of the second covered stent 121 can be reduced. That is, the outer diameter of the distal end of the second covered stent 121 can be equal to the outer diameter of the proximal end of the first covered stent 111, and the outer diameter of the distal end of the second covered stent 121 can also be smaller than the outer diameter of the proximal end of the first covered stent 111. This allows for a more diverse shape of the implant 1, thus adapting to implantation into more anatomical structures. In other embodiments, the sealing component 122 can be omitted, and the channel 13 can be formed by the cooperation of the inner wall of the first covered stent 111 and the outer wall of the second covered stent 121. It is understood that the connection position between the connector 112 and the first covered stent 111 and the second covered stent 121 will change accordingly to ensure that the second covered stent 121 can be at least partially accommodated within the first lumen 110. It is also understood that when the second tubular member 12 includes the sealing component 122, the restraining component 23 restrains at least the distal end of the sealing component 122, thereby fully opening the channel 13. When the sealing component 122 is omitted, the restraining component 23 restrains at least the distal end of the second film-coated support 121, thereby fully opening the channel 13. It should be noted that the first film-coated support 111, the second film-coated support 121, and the sealing component 122 can be integral structures of equal diameter or variable diameter structures. As long as the formation of the channel 13 can be guaranteed, the shape of the first film-coated support 111, the second film-coated support 121, and the sealing component 122 is not limited.

[0053] In other embodiments, the connector 112 and the sealing assembly 122 can be omitted simultaneously, allowing the first film-coated bracket 111 and the second film-coated bracket 121 to be directly connected to form a channel 13. For example, the first film-coated bracket 111 and the second film-coated bracket 121 can be connected at multiple discrete connection points in the circumferential direction to form multiple channels 13 that can be opened and closed and are spaced apart circumferentially along the second film-coated bracket 121; or, the first film-coated bracket 111 and the second film-coated bracket 121 can be directly connected, with only a portion connected and a portion unconnected, in which case a non-annular channel 13 is formed in the unconnected area. It is understood that in this case, in the overlapping portion of the first film-coated bracket 111 and the second film-coated bracket 121, the radial dimension of the second film-coated bracket 121 can only be slightly smaller than the radial dimension of the first film-coated bracket 111, thereby ensuring that the channel 13 can be closed while guaranteeing its formation.

[0054] Please continue reading. Figure 2 In one embodiment, the connector 112 is a corrugated rod, with its distal end interlocked with the first film-coating bracket 111 to achieve a hinged connection with the first film-coating bracket 111, and its proximal end fixedly connected to the second film-coating bracket 121. This allows the connector 112 to rotate around the connection point between the connector 112 and the first film-coating bracket 111 as the second film-coating bracket 121 expands or contracts, thereby maintaining the connection between the first film-coating bracket 111 and the second film-coating bracket 121 without hindering the expansion or contraction of the second film-coating bracket 121.

[0055] In other embodiments, the connector 112 may also be configured as a plurality of separate straight rods, one end of which is connected to the first coating bracket 111 and the other end of which is connected to the second coating bracket 121.

[0056] In this embodiment, the connector 112 is a flexible component, for example, made of polymer filaments. It is understood that when the connector 112 is flexible, to ensure the connection between the first coating support 111 and the second coating support 121 without hindering the expansion or contraction of the second coating support 121, one end of the connector 112 can be fixedly connected to the first coating support 111 or the second coating support 121, and the other end can be hinged, or both ends can be hinged. In other embodiments, the connector 112 can also be a rigid component, for example, made of metal wire. It is understood that when the connector 112 is rigid, to ensure the connection between the first coating support 111 and the second coating support 121 without hindering the expansion or contraction of the second coating support 121, both ends of the connector 112 need to be hinged to the first coating support 111 and the second coating support 121 respectively.

[0057] Please see Figure 3-4 In one embodiment, the sealing assembly 122 includes a sealing membrane 1221 and at least two drive rods 1222.

[0058] The sealing membrane 1221 is connected to the second covered support 121 at its proximal end and extends axially toward the side where the first covered support 111 is located to be at least partially accommodated in the first cavity 110. The portion of the sealing membrane 1221 accommodated in the first cavity 110 has a free end. The sealing membrane 1221 has an unfolded and folded state. The outer wall of the portion of the sealing membrane 1221 accommodated in the first cavity 110 cooperates with the inner wall of the first covered support 111 to form a channel 13. The driving rod 1222 is connected to the second covered support 121 at its proximal end and extends axially toward the side where the first covered support 111 is located to be at least partially accommodated in the first cavity 110. The portion of the driving rod 1222 accommodated in the first cavity 110 has a free end. The driving rod 1222 is connected to the sealing membrane 1221. The driving rod 1222 is used to drive the sealing membrane 1221 to unfold as the second covered support 121 expands or to drive the sealing membrane 1221 to fold as the second covered support 121 contracts.

[0059] By configuring the sealing assembly 122 to include a sealing membrane 1221 and a drive rod 1222, when a branch stent is implanted in the channel 13, since there are no extra stent units on the sealing membrane 1221 to obstruct it, the sealing membrane 1221 can more tightly cover the side wall of the branch stent, thus ensuring a better anti-internal leakage effect. Furthermore, because the sealing membrane 1221 has no extra stent units and is more flexible, it can prevent the branch stent from being jointly squeezed by the first covered stent 111 and the sealing assembly 122, thus better maintaining the shape of the branch stent.

[0060] It is understandable that the specific extension direction of the drive rod 1222 only needs to satisfy the following: when both the first coating bracket 111 and the second coating bracket 121 are in a radially extended state, the portion of the drive rod 1222 housed in the first coating bracket 111 is in contact with the inner wall of the first coating bracket 111. For example, in one embodiment, the first film-coated support 111 is a cylindrical structure with equal diameter, and the driving rod 1222 is fully housed within the first film-coated support 111 when both the first film-coated support 111 and the second film-coated support 121 are in the unfolded state. In this case, the driving rod 1222 is a straight rod structure. Alternatively, in other embodiments, the first film-coated support 111 is still a cylindrical structure with equal diameter, but the driving rod 1222 is only partially housed within the first film-coated support 111 when both the first film-coated support 111 and the second film-coated support 121 are in the unfolded state. In this case, the portion of the driving rod 1222 housed within the first film-coated support 111 is a straight rod that fits against the inner wall of the first film-coated support 111, while the extension direction of the portion of the driving rod 1222 not housed within the first film-coated support 111 can form a non-zero angle with the extension direction of the portion of the driving rod 1222 housed within the first film-coated support 111. Alternatively, if the first film-coated support 111 is a variable-diameter cylindrical structure, then the portion of the drive rod 1222 housed within the first film-coated support 111 is a curved rod with a bending angle that fits against the inner wall of the first film-coated support 111, and its bending angle matches the internal shape of the first film-coated support 111.

[0061] It should be noted that the proximal end of the drive rod 1222 can be fixed to the second coating bracket 121 by welding, sewing or other means, or it can be woven from the braided filaments on the second coating bracket 121. The specific connection method can be selected according to the application.

[0062] In one embodiment, the drive rod 1222 is a long rod-shaped structure with a rectangular cross-section. In other embodiments, the cross-section of the drive rod 1222 can also be circular, fan-shaped, elliptical, or other polygonal shapes. Alternatively, the drive rod 1222 can also be a spiral structure formed by winding braided filaments. In one embodiment, the sealing membrane 1221 is integrally formed with the membrane on the second membrane-covered support 121. In other embodiments, the sealing membrane 1221 can also be sewn to the distal end of the second membrane-covered support 121 by sutures. The sealing membrane 1221 can be a monolithically formed annular sheet or it can be composed of multiple arc-shaped sheets spliced ​​together. It is understood that the material of the sealing membrane 1221 can be a biocompatible material such as nylon, polyester fabric, or PTFE film. It should be noted that the material of the sealing membrane 1221 is not limited to the materials mentioned above; the material of the sealing membrane 1221 can be a flexible material that can block blood flow and is suitable for implantation in the human body. The connection between the sealing membrane 1221 and the drive rod 1222 can be achieved by suturing, heat treatment covering, or bonding.

[0063] It should be noted that in other embodiments, the drive rod 1222 and the sealing membrane 1221 can also be connected to the middle or distal end of the second coating bracket 121. However, the method of connecting the drive rod 1222 and the sealing membrane 1221 to the distal end of the second coating bracket 121 is more convenient to assemble and does not affect the shape of the second coating bracket 121.

[0064] Please continue reading. Figure 3-4 In one embodiment, the distal end of the sealing membrane 1221 is also point-connected to the first covered support 111, meaning the sealing membrane 1221 is connected to the first covered support 111 at multiple discrete points and is not completely closed in the circumferential direction. Furthermore, the connection points between the sealing membrane 1221 and the first covered support 111, and the connection points between the connector 112 and the first covered support 111, are located on the same axis on the first covered support 111. The distal ends of the sealing membrane 1221 and the drive rod 1222 are disposed on the same radial plane (a radial plane is a plane perpendicular to the longitudinal central axis of the implant 1). The distal end of the drive rod 1222 is also provided with a restraining ring 14, and the restraining assembly 23 restrains the distal end of the sealing assembly 122 by passing through each restraining ring 14.

[0065] Before the branch stent is implanted, the outer sheath 22 is retracted, releasing the first covered stent 111, which is radially expanded, while the proximal portion of the second covered stent 121 is radially compressed. At this time, the proximal end of the drive rod 1222, constrained by the second covered stent 121, drives the proximal end of the sealing membrane 1221 to fold, while the distal end of the drive rod 1222, constrained by the constraint component 23, also drives the distal end of the sealing membrane 1221 to fully fold, thus fully opening the channel 13. The folded sealing membrane 1221, due to its point connection with the first covered stent 111, divides the gap between the sealing component 122 and the first covered stent 111, forming multiple distinct channels 13. After the branch stent is implanted in the specific channel 13, by releasing the distal end of the drive rod 1222 and the second covered stent 121, the proximal end of the connector 112 and the drive rod 1222 will move towards the side closer to the inner wall of the first covered stent 111 as the second covered stent 121 unfolds. Driven by the drive rod 1222, the sealing membrane 1221 also unfolds until the second covered stent 121 is in a radially unfolded state. At this time, in the channel 13 where the branch stent is implanted, the drive rod 1222 is attached to the side wall of the branch stent, and the sealing membrane 1221 is wrapped around the branch stent under the action of the drive rod 1222 to wrap the branch stent. In the channel 13 where no branch stent is implanted, the drive rod 1222 drives the sealing membrane 1221 to adhere to the inner wall of the first covered stent 111 to seal the channel 13.

[0066] By point-connecting the sealing membrane 1221 to the first covered stent 111, the implant 1 has channels 13 in all implantation directions, and the boundaries of the channels 13 are clear, thus facilitating the rapid positioning and implantation of the branch stent. Simultaneously, the connection between the sealing membrane 1221 and the first covered stent 111 allows the first covered stent 111 to work with the drive rod 1222 to better tension the sealing membrane 1221 and to restrict the branch stent, thereby improving the assembly stability of the branch stent. The constraint ring 14 allows the constraint component 23 to bind the distal end of the sealing component 122 by passing through the constraint ring 14. This effectively restricts the axial displacement of the constraint component 23 in the sealing component 12, preventing the constraint component 23 from slipping prematurely from the distal end to the proximal end of the sealing component 122 during stent delivery, thus enhancing the constraint stability of the constraint component 23. Alternatively, by setting the size of the constraint ring 14, the projected area of ​​the constraint ring 14 on the first film-coating bracket 111 can be larger than the projected area of ​​the same length part of the drive rod 1222 on the first film-coating bracket 111. In this case, when the channel 13 is in the closed state, the constraint ring 14 can also increase the tightness of the contact between the sealing film 1221 and the first film-coating bracket 111, thereby expanding the function of the constraint ring 14.

[0067] It is understood that in other embodiments, the sealing membrane 1221 may only be connected to the drive rod 1222, that is, the sealing membrane 1221 is not connected to the first covering bracket 111. In the contracted state, the first covering bracket 111 and the sealing membrane 1221 are in contact, but there is no connection point between them. In this way, the sealing component 122 can also play a good sealing role, and the first covering bracket 111 and the sealing component 122 do not interfere with each other, thus not affecting the opening and closing of the channel 13. It is understood that when the sealing membrane 1221 is not connected to the first covering bracket 111, the constraint component 23 can constrain the sealing component 12 by simultaneously binding the sealing membrane 1221 and the drive rod 1222.

[0068] It is also understood that in other embodiments, the constraint ring 14 may be omitted. When the constraint ring 14 is omitted, the distal end of the drive rod 1222 may be set to extend beyond the distal end of the sealing membrane 1221, so that the constraint component 23 can restrain the distal end of the sealing component 122 by constraining the distal end of the drive rod 1222.

[0069] It should be noted that when the sealing membrane 1221 is connected to the first covered stent 111 to form multiple non-interconnected channels 13, the size of each channel 13 when unfolded is preferably matched with the size of the branch stent to be implanted.

[0070] Additionally, please see Figure 2 and Figure 5 To further enhance the installation stability of the branch support, an extension edge 1223 is connected to the distal end of the sealing membrane 1221. The extension direction of the extension edge 1223 is parallel to the extension direction of the first membrane support 111, and the axial height of the distal end of the extension edge 1223 is higher than the height of the crest of the connector 112. The axial height of the distal end of the constraint ring 14 is flush with the distal end of the extension edge 1223. The extension edge 1223 is used to extend the axial length of the channel 13. Under the action of the extension edge 1223, the axial length of the channel 13 is extended to a certain extent, thereby making the structure of the channel 13 more complete, which is more conducive to the establishment of the branch support path and the maintenance of the stability of the branch support.

[0071] Please see Figure 6 In one embodiment, the restraint assembly 23 includes a bolt 231 and a bolt rope 232.

[0072] The extension direction of the bolt 231 is consistent with that of the sheath core 21. The bolt 231 is axially movably housed in the outer sheath tube 22 and is movably connected to the bolt rope 232. In the loaded state, the bolt rope 232 detachably binds the distal end of the second tubular member 12 to the sheath core 21 in the radial direction. When the bolt rope 232 is connected to the bolt 231, the bolt rope 232 binds the distal end of the second tubular member 12. When the bolt rope 232 is separated from the bolt 231, the binding of the bolt rope 232 on the second tubular member 12 is lost.

[0073] The implant delivery system provided in the above embodiments uses the bolster 231 and the bolster rope 232 to bind the second tubular component 12, which has a simple structure and is easy to operate.

[0074] Please continue reading. Figure 6 In one embodiment, the distal end of the drive rod 1222 is provided with a constraint ring 14 corresponding to each other. The tether rope 232 passes through each constraint ring 14 and forms a movable connection with the tether rod 231. The tether rope 232 is tightened to restrain the distal end of the sealing assembly 122.

[0075] Specifically, in this embodiment, the tethering rope 232 is folded in half to form a sleeve end 2321a and an open end 2322a. The sleeve end 2321a refers to the end of the tethering rope that forms a loop after being folded in half, and the open end 2322a refers to the end that includes two line segments. The sleeve end 2321a is sleeved on the tethering rod 231, while the open end 2322a extends along the sheath core 21 to the outside of the conveyor 2 after passing through all the constraint rings 14 in sequence and being tightened.

[0076] When securing the distal end of the sealing assembly 122, the tether 232 can be folded in half to form a sleeve end 2321a and an open end 2322a. Then, the collar on the sleeve end 2321a is fitted onto the tether rod 231. Next, both segments of the open end 2322a are simultaneously inserted into one of the restraining rings 14 near the sheath core 21 and exited from the side of the restraining ring 14 away from the sheath core 21. Then, the open end 2322a is inserted into the next restraining ring 14 near the sheath core 21 and exited from the side of the restraining ring 14 away from the sheath core 21. This insertion and exit process is repeated until the tether 232 passes through the... After some of the constraint rings 14 are lowered, the open end 2322a is lowered from the far end of the sheath core 21, so that the open end 2322a overlaps the sleeve end 2321a. Then the open end 2322a extends along the sheath core 21 to the outside of the conveyor 2. At this time, by pulling the open end 2322a, due to the presence of the bolt rod 231, the sleeve end 2321a of the bolt rope 232 cannot move. Therefore, each constraint ring 14 will approach each other under the drive of the tension on the bolt rope 232 until each constraint ring 14 abuts against the sheath core 21. At this time, the sealing membrane 1221 is fully tensioned under the drive of the drive rod 1222, and the channel 13 is fully opened. After the branch stent is implanted, the tether rod 231 can be pulled out first. At this time, the sleeve end 2321a of the tether rope 232 is no longer restricted by the tether rod 231 and can move freely, thus losing its driving effect on the constraint ring 14. The constraint rings 14 will separate from each other under the action of the self-expansion of the drive rod 1222. At this time, the tether rope 232 can be removed from the conveyor 2 by pulling the open end 2322a.

[0077] This method of using the 232-type rope threading is simple and easy to operate.

[0078] Please continue reading. Figure 7-9 In one embodiment, a constraint ring 14 is provided at the distal end of each drive rod 1222, and a tether rope 232 passes through each constraint ring 14 and forms a movable connection with the tether rod 231, thereby restraining the distal end of the sealing assembly 122. Unlike the previous embodiment, the tether rope 232 is threaded in a different manner.

[0079] Specifically, in this embodiment, the tether 232 includes a reversing portion 2321b and two free ends 2322b. The reversing portion 2321b is disposed between the two free ends 2322b, and the number of reversing portions 2321b corresponds one-to-one with the number of constraint rings 14. After passing through the constraint rings 14, the reversing portion 2321b is sleeved on the tether rod 231, thereby forming a movable connection with the tether rod 231. The two free ends 2322b extend along the sheath core 21 to the outside of the conveyor 2.

[0080] In this embodiment, when the constraint rings 14 are not constrained by the constraint component 23, the constraint rings 14 are spaced a certain distance apart under the self-expansion action of the sealing component 122, and the channel 13 is not fully opened (e.g., Figure 8 (As shown). If the constraint rings 14 are sequentially numbered as ring 14a, ring 14b, ring 14c, ring 14d, ring 14e, and ring 14f in a clockwise direction, then to bind the distal end of the sealing assembly 122, one free end 2322b of the tether 232 can be extended along the sheath core 21 to the constraint ring 14, while the other free end 2322b of the tether 232 protrudes outside the conveyor 2. Then, the free end 2322b located at the constraint ring 14 is first inserted into ring 14a, and then the free end 2322b is folded back around the tether rod 231 to form a folded-back portion 2321b. The rope 232 passes through ring 14a and then through ring 24b. The free end 2322b then folds back around the bolt 231 to form a folded section 2321b before exiting through ring 24b again. This insertion-folding-exit process is repeated until the rope 232 passes through all the constraint rings 14. The free end 2322b is then extended along the sheath core 21 to the outside of the conveyor. Finally, both free ends 2322b are pulled simultaneously. Under the constraint of the bolt 231, the constraint rings 14 are driven closer together and finally restrained on the sheath core 21. To release the restraint, the bolt 231 can be pulled out first, and then one of the free ends 2322b can be pulled to remove both the bolt 231 and the rope 232 from the conveyor 2.

[0081] With this insertion method, the force exerted by the tether 232 on the restraint ring 14 is smaller during the process of removing the tether 232, thereby avoiding the situation where the implant 1 is displaced due to pulling the tether 232.

[0082] It is understood that in other embodiments, the tether 232 can also be inserted through ring 14a, folded around the bolt 231, and then exit through ring 24b. Alternatively, the two ends of a portion of the folded portion 2321b formed by the tether 232 folding around the bolt 231 can extend from the same constraint ring 14, while the two ends of the other portion of the folded portion 2321b can extend from two separate constraint rings 14. The method of threading the tether 232 only needs to satisfy the requirement that the constraint rings 14 can be pulled closer together and bound, without forming an inescapable knot. It is understood that when the number of constraint rings 14 is even, the tether 232 can be inserted through ring 14a, folded around the bolt 231, and then exit through ring 24b. That is, each end of the folded portion 2321b of the tether 232 is threaded through a constraint ring 14, thereby making the number of folded portions 2321b half the number of constraint rings 14.

[0083] It should be noted that the above description uses rings 14a, 14b, 14c, 14d, 14e, and 14f as examples to illustrate one method of constraining the sealing assembly 122 with the constraint component 23. However, in other embodiments, regardless of the winding method used to constrain the sealing assembly 11, the number of constraint rings 14 is not limited to six; it can be more or less than six. Furthermore, in this embodiment, the constraint rings 14 are circular. In other embodiments, the constraint rings 14 can also be rectangular or triangular ring structures, or they can be non-complete rings. The specific structure of the constraint rings 14 is not limited, as long as they can move closer to each other with the rope 232 when the rope 232 is tightened.

[0084] It is understandable that in the two insertion methods mentioned above, the bolt 231 can be located inside the second tubular member 12 or outside the second tubular member 12. However, when the bolt 231 is located inside the second tubular member 12 to abut against the sheath core 21, the driving force applied to each constraint ring 14 when the bolt rope 232 is pulled can be more uniform.

[0085] Please see Figure 10-12 In one embodiment, the constraint assembly 23 further includes a constraint control element 233, which is connected to the sheath core 21, the bolt 231 and the tether rope 232. The constraint control element 233 is used to control the bolt 231 and the tether rope 232 to move axially toward the proximal end of the conveyor 2.

[0086] Specifically, in one embodiment, the constraint control element 233 includes a mounting base 2331, a bolt release key 2332, and a rope release key 2333.

[0087] The mounting base 2331 is fixedly connected to the proximal end of the sheath core 21. The mounting base 2331 has a bolt mounting hole 23311 and a rope mounting hole 23312. The bolt mounting hole 23311 is used to accommodate and extend the bolt 231, and the rope mounting hole 23312 is used to accommodate and extend the rope 232. The bolt release key 2332 is engaged with the mounting base 2331 and is connected to the proximal end of the bolt 231. When the bolt release key 2332 is separated from the mounting base 2331, the bolt release key 2332 can drive the bolt 231 to move axially away from the mounting base 2331. The rope release key 2333 is also engaged with the mounting base 2331, and the rope release key 2333 is connected to the open end 2322a or the free end 2322b of the rope 232. When the rope release key 2333 is separated from the mounting base 2331, the rope release key 2333 can drive the rope 232 to move axially away from the mounting base 2331.

[0088] It is understandable that the engagement between the bolt release key 2332 and the mounting base 2331 is achieved through the cooperation of a locking block (not shown) and a locking groove (not shown). Specifically, the locking block is located on the bolt release key 2332, and the locking groove is located on the mounting base 2331; alternatively, the locking block is located on the mounting base 2331, and the locking groove is located on the bolt release key 2332. The bolt release key 2332 can be partially accommodated in the bolt mounting hole 23311 and engage with the side wall of the bolt mounting hole 23311. The engagement between the rope release key 2333 and the mounting base 2331 is also achieved through the cooperation of a locking block and a locking groove. Specifically, the locking block is located on the rope release key 2333, and the locking groove is located on the mounting base 2331; alternatively, the locking block is located on the mounting base 2331, and the locking groove is located on the rope release key 2333. The rope release key 2333 can be partially accommodated in the rope mounting hole 23312 and engaged with the side wall of the rope mounting hole 23312.

[0089] Please continue reading. Figure 10-12 In one embodiment, the conveyor is further provided with two side guide tubes 24. The side guide tubes 24 are hollow tubes and are fixed axially on the outer surface of the sheath core 21. The proximal end of one side guide tube 24 is connected to the tether rod mounting hole 23311, which is used to accommodate and pass through the tether rod 231. The proximal end of the other side guide tube 24 is connected to the tether rope mounting hole 23312, which is used to accommodate and pass through the tether rope 232. The side guide tubes 24 are provided so that the tether rod 231 and tether rope 232 will not be interfered with by other components during the withdrawal process, thereby making the withdrawal of the tether rod 231 and tether rope 232 smoother.

[0090] Understandably, the number of side tubes 24 is not limited, and only one may be provided to allow both the tether rope 232 and the tether rod 231 to be threaded through simultaneously. For example, the side tube 24 may be a multi-lumen tube, which would still ensure that the tether rod 231 and the tether rope 232 do not interfere with each other. When the side tube 24 is a multi-lumen tube, the side tube 24 is sleeved and fixed on the sheath core 21.

[0091] It is also understood that both the thrombectomy rod 231 and the thrombectomy cord 232 are made of materials that can come into contact with blood. For example, the thrombectomy rod 231 can be made of stainless steel, nickel-titanium, or a polymer material that can come into contact with blood, and the thrombectomy cord 232 can be made of materials such as polyethylene or polyester. In addition, in other embodiments, the thrombectomy cord 232 can also be made of a biodegradable material.

[0092] Please continue reading. Figure 2 and Figure 10-11In one embodiment, the proximal end of the second tubular member 12 is further provided with a hook portion 123, and the delivery device 2 also includes a hook member 25. The hook member 25 is fixed on the sheath core 21, and the hook member 25 is detachably connected to the hook portion 123. When the implant 1 is at least partially contained in the loading cavity 220, the hook member 25 is connected to the hook portion 123. When the outer sheath tube 22 completely releases the implant 1, the hook member 25 is disconnected from the hook portion 123.

[0093] The mounting part 123 and the mounting piece 25 can keep the implant 1 in a fixed axial position on the sheath core 21 before it is fully released, thus avoiding the situation where the implant 1 is displaced due to excessive friction between the tether 232 and the implant 1 during the pulling of the tether 232.

[0094] For details, please continue reading. Figure 2 and Figure 11 In one embodiment, the hook part 123 is a hook ring, the hook member 25 is a hook block, and the side wall of the hook member 25 is provided with a receiving groove 251. The receiving groove 251 is provided with a positioning post 252. When the second tubular member 12 is housed in the outer sheath tube 22 and is in a compressed state, the hook part 123 is sleeved on the positioning post 252 and the hook part 123 is housed in the receiving groove 251. When the opening of the receiving groove 251 is covered by the outer sheath tube 22, the second tubular member 12 is limited under the restriction of the outer sheath tube 22. When the outer sheath tube 22 is removed, the second tubular member 12 will change from a compressed state to an unfolded state under the action of self-expanding force, so that the hook part 123 is disengaged from the positioning post 252, that is, the hook part 123 is separated from the hook member 25 and the second tubular member 12 is separated from the sheath core 21.

[0095] It is understandable that the size of the positioning post 252 can match the size of the hook ring, or it can be smaller than the size of the hook ring, as long as it can allow the hook ring to detach from the positioning post 252 under the action of the self-expanding force of the second tubular member 12. In addition, the hook part 123 does not have to be a complete ring. For example, it can be a partially open C-shape. That is, the hook part 123 only needs to ensure that it does not move axially relative to the hook member 25 when the second tubular member 12 is in a compressed state.

[0096] In this embodiment, the connector 25 is located at the distal end of the side conduit 24, thereby allowing the connector 25 to further secure the side conduit 24 to the sheath core 21. In other embodiments, the connector 25 may also be located in the middle of the side conduit 24.

[0097] Please continue reading. Figure 10-12In one embodiment, the delivery device 2 further includes an outer sheath drive assembly 26 for driving the outer sheath 22 to slide axially relative to the sheath core 21.

[0098] In one embodiment, the outer sheath drive assembly 26 includes a slide rail 261, a base 262, and a drive member 263.

[0099] The proximal end of the sheath core 21 is fixedly assembled with the base 262; the proximal end of the slide rail 261 is connected to the base 262 and the slide rail 261 extends in the axial direction; the drive member 263 is slidably assembled with the slide rail 261 and is connected to the proximal end of the outer sheath tube 22. When the drive member 263 slides along the slide rail 261, it drives the outer sheath tube 22 to slide relative to the sheath core 21.

[0100] Please see Figure 11 In one embodiment, the proximal end of the sheath core 21 is fixedly connected to the base 262. The slide rail 261 is a hollow tube, connected to the base 262, and sleeved on the outside of the sheath core 21. A sliding hole 2610 is provided on the side wall of the slide rail 261 (see...). Figure 1 The sliding hole 2610 extends axially. The driving member 263 includes a sliding part 2631, an operating part 2632, and a connecting key 2633. The sliding part 2631 is housed within the slide rail 261, and the proximal end of the outer sheath 22 is connected to the sliding part 2631. The sliding part 2631 has a clearance hole (not shown) for the sheath core 21 to pass through. The operating part 2632 is located outside the slide rail 261 and receives the driving force applied by the operator. One end of the connecting key 2633 is connected to the sliding part 2631, and the other end extends from the sliding hole 2610 to connect with the operating part 2632. By pushing the operating part 2632 to slide along the sliding hole 2610, the sliding part 2631 can be driven to slide along the slide rail 261, thereby causing the outer sheath 22 to slide relative to the sheath core 21. In this embodiment, the distal end of the slide rail 261 gradually narrows to form a conical head, and the end of the conical head forms a channel (not shown in the figure) that allows only the outer sheath tube 22 to pass through, thereby further ensuring the pushing stability of the outer sheath tube 22.

[0101] In this embodiment, two sliding holes 2610 are provided and symmetrically distributed on the side wall of the slide rail 261. Two corresponding operating parts 2632 are also provided, allowing the drive member 263 to slide more stably along the slide rail 261. In other embodiments, the number of sliding holes 2610 can be three, four, six, or other integers, and the number of operating parts 2632 can also be correspondingly set to other integers, making it easier for the operator to select the most convenient side of the operating part 2632 for pushing. Additionally, in this embodiment, a groove (not shown in the figure) is provided on the sliding part 2631. This groove communicates with the clearance hole, and the outer sheath tube 22 is accommodated in the groove and bonded to the sliding part 2631 with medical adhesive. In other embodiments, the outer sheath tube 22 and the sliding part 2631 can also be configured to snap together. Furthermore, to facilitate pushing the operating part 2632, in this embodiment, the operating part 2632 is configured as an arched plate with its opening facing away from the sliding part 2631. The arched design is more ergonomic, making it easier for the operator to apply force to the operating part 2632 and making it easier to operate.

[0102] It should be noted that in this embodiment, the drive member 263 is also provided with an exhaust hole 2630, which is connected to the clearance hole and extends through the sliding part 2631. The exhaust hole 2630 is used to discharge gas or liquid in the gap between the outer sheath tube 22 and the sheath core 21. In addition, to further ensure the sealing of the delivery device 2, a sealing gasket 264 and a cover 265 are provided at the proximal end of the drive member 263. The cover 265 is screwed into the proximal end of the sliding part 2631 to clamp the sealing gasket 264, which is used to seal the clearance hole. The sealing gasket 264 can prevent blood from flowing back from the outer sheath tube 22 along the clearance hole into the slide rail 261, thereby reducing the surgical risk. It is understood that both the sealing gasket 264 and the cover 265 are provided with clearance channels for the sheath core 21 to pass through.

[0103] Please continue reading. Figure 11In one embodiment, the slide rail 261 includes a front cover 2611, an upper housing 2612, a lower housing 2613, and a rear cover 2614. The upper housing 2612 and the lower housing 2613 are joined to form the main body of the slide rail 261. The front cover 2611 and the rear cover 2614 cooperate to lock or unlock the upper housing 2612 and the lower housing 2613. In this embodiment, the front cover 2611 is threaded to the upper housing 2612 and the lower housing 2613, and the rear cover 2614 is snap-fitted to the upper housing 2612 and the lower housing 2613. In other embodiments, the front cover 2611 may also be snap-fitted to the upper housing 2612 and the lower housing 2613, or other mechanical connections may be used, and the rear cover 2614 may also be threaded to the upper housing 2612 and the lower housing 2613, or other mechanical connections may be used. It is understandable that if the slide rail 261 is configured as an assembly of the detachable upper housing 2612 and lower housing 2613, then the locking threads are actually distributed on the upper housing 2612 and the lower housing 2613.

[0104] Please continue reading. Figure 11-12 In one embodiment, a limiting baffle 2615 is provided on the proximal end of the slide rail 261, and the limiting baffle 2615 encloses a receiving cavity (not shown in the figure), in which the base 262 is received, thereby completing the connection with the slide rail 261. In other embodiments, the base 262 and the slide rail 261 may also be integrally formed or snap-fitted, and the connection method between the two is not limited.

[0105] Please continue reading. Figure 11-12 In one embodiment, the mounting base 2331 in the constraint control member 233 is also housed within the receiving cavity of the slide rail 261, and the mounting base 2331 is located near the proximal end of the base 262. The mounting base 2331 also has a through hole 23313. The base 262 has three guide channels 2621. The distal end of each guide channel 2621 is connected to the sheath core 21 and two side guide tubes 24, respectively. The proximal end of each guide channel 2621 is connected to the tether rod mounting hole 23311, the tether rope mounting hole 23312, and the through hole 23313, respectively. The guide channels 2621 are used for the passage of the finger guide wire or tether rod 231 and tether rope 232. To ensure that the guide channels 2621 do not affect the smoothness of the finger guide wire or tether rod 231 and tether rope 232 entering and exiting the guide channels 2621, the size of the guide channels 2621 is preferably 0.8-1.2 mm.

[0106] It should be noted that, in one embodiment, an exhaust channel 2622 is also provided on the base 262. The exhaust channel 2622 is connected to the three guide channels 2621 at the same time, and the exhaust channel 2622 is used for exhaust treatment.

[0107] Understandably, each guide channel 2621 is provided with a leak-proof gasket (not shown in the figure) at its proximal end, and the leak-proof gasket has a channel through which the guide wire or bolt 231 and bolt rope 232 can pass.

[0108] Please return Figure 2-3 In one embodiment, the first tubular member 11 further includes a cover film 113. The distal end of the cover film 113 is connected to the proximal end of the first covering support 111, and the proximal end extends toward the side near the second covering support 121 to form a free end. The cover film 113 is fixedly connected to the connector 112 along the extension direction of the connector 112.

[0109] In this embodiment, the outer diameter of the second film-coated support 121 is smaller than the outer diameter of the first film-coated support 111. The distal outer diameter of the sealing film 1221 matches the inner diameter of the first film-coated support 111, and the proximal outer diameter of the sealing film 1221 matches the outer diameter of the second film-coated support 121. Therefore, the sealing film 1221 is frustoconical in shape when radially unfolded. The channel 13 is formed by the mating of the outer wall of the sealing film 1221 and the inner wall of the cover film 113.

[0110] When the first covering bracket 111 is radially expanded and the second covering bracket 121 is radially compressed, the drive rod 1222 drives the sealing film 1221 to fold. At this time, the proximal end of the connector 112 also contracts under the influence of the second covering bracket 121, while the distal end of the connector 112 expands under the influence of the first covering bracket 111, causing the cover film 113 fixed on the connector 112 to expand, thus forming multiple non-communicating channels 13 between the inner side of the cover film 113 and the outer side of the sealing film 1221. When the second covering bracket 121 changes to a radially expanded state, the distal end of the connector 112 and the drive rod 1222 both expand outward, causing the sealing film 1221 to abut against the cover film 113 to close the channels 13. This configuration ensures that when the branch stent is held by the channel 13, both its inner and outer sides are flexible membranes, meaning that the cover membrane 113 and the sealing membrane 1221 can better conform to the shape of the branch stent, thereby allowing the branch stent to be more tightly wrapped, resulting in better anti-leakage and fixation of the branch stent by the implantable medical device 1.

[0111] Understandably, the material of the cover membrane 113 can be selected from materials with good biocompatibility, such as nylon, polyester, and polytetrafluoroethylene.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An implant delivery system, characterized by, The implant comprises a first tubular member and a second tubular member, the first tubular member is provided with a first lumen, the second tubular member is provided with a second lumen, the first tubular member is connected with the second tubular member, and a distal end portion of the second tubular member is accommodated in the first tubular member so that an outer wall of the second tubular member cooperates with an inner wall of the first tubular member to form an openable or closable passage. The delivery device comprises a sheath core, an outer sheath, and a restraint assembly, the outer sheath is hollow and sleeved outside the sheath core, an accommodation cavity with an opening is formed between the outer sheath and the sheath core, the accommodation cavity is used for accommodating the compressed implant, the outer sheath is slidable relative to the sheath core to release the implant, the restraint assembly is connected with the second tubular member, and the restraint assembly is used for releasably binding the distal end of the second tubular member into a compressed state to open the passage when the first tubular member is in a radially expanded state. The restraint assembly comprises a pin rod and a pin rope, the pin rod extends in the same direction as the sheath core, the pin rod is movably accommodated in the outer sheath in an axial direction and is movably connected with the pin rope. In a loaded state, the pin rope releasably binds the distal end of the second tubular member on the sheath core in a radial direction, when the pin rope is connected with the pin rod, the pin rope binds the distal end of the second tubular member, and when the pin rope is separated from the pin rod, the binding of the pin rope to the second tubular member disappears. The distal end of the second tubular member is provided with at least one restraint ring, the pin rope passes through the restraint ring and is tightened to releasably radially bind the distal end of the second tubular member on the sheath core. The pin rope is folded to form a sleeved end and an open end, the sleeved end is sleeved on the pin rod, and the open end extends to the outside of the delivery device along the sheath core after sequentially passing through the at least one restraint ring.

2. The implant delivery system of claim 1, wherein, The pin rope comprises two free ends and at least one folding part arranged between the two free ends, the folding part corresponds to the restraint ring one by one, the folding part is sleeved on the pin rod after passing through the restraint ring, and the free ends extend to the outside of the delivery device along the sheath core; or when the number of the restraint rings is even, the number of the folding parts is half of the number of the restraint rings, and two ends of the folding part pass through one restraint ring respectively.

3. The implant delivery system of claim 2, wherein, The restraint assembly further comprises a restraint control member, the restraint control member is connected with the pin rod and the pin rope, and the restraint control member is used for controlling the pin rod and the pin rope to move axially towards the proximal end of the delivery device.

4. The implant delivery system of claim 2, wherein, The restraint control member comprises:

5. The implant delivery system of claim 3 or 4, wherein, a mounting seat arranged at the proximal end of the sheath core, the mounting seat is provided with a pin rod mounting hole through which the pin rod passes out and a pin rope mounting hole through which the pin rope passes out; 6. The implant delivery system of claim 5, wherein, a pin rod release key which is connected with the mounting seat and connected with the proximal end of the pin rod, and the pin rod release key can drive the pin rod to move axially away from the mounting seat when the pin rod release key is separated from the mounting seat; and a pin rope release key which is connected with the mounting seat and connected with the proximal end of the pin rope, and the pin rope release key can drive the pin rope to move axially away from the mounting seat when the pin rope release key is separated from the mounting seat. ​ The rope release key is connected with the mounting seat, and the rope release key is connected with the open end or the free end of the rope. When the rope release key is separated from the mounting seat, the rope can be driven to move axially away from the mounting seat.

7. The implant delivery system of claim 1, wherein, The delivery device further comprises an outer sheath driving assembly for driving the outer sheath to slide axially relative to the sheath core, the outer sheath driving assembly comprises: a slide rail extending in an axial direction; a base connected with a proximal end of the slide rail, the sheath core passes through the slide rail and a proximal end of the sheath core is connected with the base; and a driving member slidingly assembled with the slide rail, the outer sheath passes through the slide rail and a proximal end of the outer sheath is connected with the driving member, the driving member slides along the slide rail to drive the outer sheath to slide relative to the sheath core.

8. The implant delivery system of claim 7, wherein, The slide rail is a hollow tube, and a slide hole extending in an axial direction is formed in a side wall of the slide rail. The driving member comprises a sliding part, an operating part and a connecting key. The sliding part is accommodated in the slide rail and connected with the outer sheath. The operating part is located outside the slide rail. One end of the connecting key is connected with the sliding part, and the other end of the connecting key extends out of the slide hole and is connected with the operating part.

9. The implant delivery system of claim 1, wherein, The proximal end of the second tubular member is further provided with a hanging part, and the delivery device further comprises a hanging member fixed on the sheath core and detachably connected with the hanging part. When the hanging part is accommodated in the loading cavity, the hanging member is connected with the hanging part. When the hanging part is located outside the outer sheath, the hanging member is disconnected from the hanging part.

10. The implant delivery system of claim 9, wherein, The hanging part is a hanging ring, and the hanging member is a hanging block. An accommodation groove is formed in a side wall of the hanging block, and a positioning column is arranged in the accommodation groove. The hanging ring is sleeved on the positioning column and accommodated in the accommodation groove. When an opening of the accommodation groove is covered by the outer sheath, the hanging member is in a connected state with the hanging part. When the opening of the accommodation groove is not covered by the outer sheath, the connection between the hanging member and the hanging part is disconnected.

11. The implant delivery system of claim 1, wherein, The implant delivery system further comprises a branch stent. When the channel is in an open state, one end of the branch stent can be inserted into the channel. When the channel is in a closed state, the branch stent is clamped by the first tubular member and the second tubular member.

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