Vascular Implant, Delivery Device and Medical Equipment

Abstract

The present invention relates to a vascular implant, a delivery device and a medical device, aiming to keep the vascular implant and the delivery rod relatively stationary axially during the delivery process, thereby avoiding the problem of the vascular implant being unloaded and improving the stability of the delivery of the vascular implant. The vascular implant of the present invention includes a first connecting portion, and the delivery device includes a delivery rod and a chamber. The delivery rod includes a second connecting portion. The first connecting portion is detachably snap-connected to the second connecting portion, and the first connecting portion and the delivery rod are adapted to be received in the chamber. When the first connecting portion and the delivery rod are received in the chamber, the first connecting portion is constrained by the chamber and remains in a snap-connected state with the second connecting portion to achieve axial locking between the vascular implant and the delivery rod; while when the first connecting portion is separated from the chamber, the first connecting portion is released from the constraint of the chamber and is in a separable state from the second connecting portion to achieve axial unlocking between the vascular implant and the delivery rod.

Description

Technical Field

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

[0002] Minimally invasive intervention is a treatment method for vascular aneurysms, which usually involves delivering a vascular implant, such as but not limited to a stent, a coil, an aneurysm occlusion device, etc., to the lesion site through a delivery device. The delivery device includes a delivery rod. During actual delivery, the delivery rod cooperates with the vascular implant and they are both placed in a delivery sheath. Then the delivery rod pushes the vascular implant in the delivery sheath to release the vascular implant.

[0003] In the prior art, the vascular implant is usually transported in the delivery sheath by the static friction force between the implant and the delivery rod, that is, after the vascular implant is crimped, it is sleeved outside the delivery rod, and the two are not mechanically connected and move as a whole in the delivery sheath. However, in actual operation, it is difficult to control the magnitude of the friction force, which easily causes the vascular implant to be dislodged (i.e., the vascular implant falls off the delivery rod), so that the vascular implant cannot be stably transported, thus affecting the surgical effect. Summary of the Invention

[0004] For this reason, the purpose of the present invention is to provide a vascular implant, a delivery device and a medical device, aiming to keep the vascular implant and the delivery rod relatively stationary axially during the delivery process, so as to avoid the problem of the vascular implant being dislodged and improve the stability of the delivery of the vascular implant.

[0005] To achieve the above object, the present invention provides a vascular implant, which is delivered to a target position through a delivery device. The delivery device includes a delivery rod and a chamber; wherein the vascular implant has a proximal end, and the proximal end includes a first connecting portion, the first connecting portion is used for detachably engaging with the delivery rod, and the first connecting portion and the delivery rod are used for being received in the chamber;

[0006] When the first connecting portion and the delivery rod are received in the chamber, the first connecting portion is constrained by the chamber and remains in a state of engagement with the delivery rod to achieve axial locking between the vascular implant and the delivery rod;

[0007] When the first connecting portion disengages from the chamber, the first connecting portion is released from the constraint of the chamber and is in a separable state from the delivery rod to achieve axial unlocking between the vascular implant and the delivery rod.

[0008] Optionally, in the vascular implant, the first connecting portion includes at least one first connecting member, the first connecting member being configured to maintain an engaged state with the delivery rod when subjected to the restraining force of the chamber, and to be in a separable state from the delivery rod when the restraining force of the chamber is released; wherein the first connecting member has a gap;

[0009] When the first connecting part and the conveying rod are accommodated in the chamber, the gap is configured to prohibit the conveying rod from passing through, so that the first connecting part and the conveying rod remain in an engaged state;

[0010] When the first connecting portion is separated from the chamber, the gap is configured to allow the conveying rod to pass through, so that the first connecting member and the conveying rod are in a separable state.

[0011] Optionally, in the vascular implant, the first connecting member includes more than two snap fasteners, the two or more snap fasteners are arranged at intervals along the circumference of the vascular implant, and the gap is formed between the two or more snap fasteners.

[0012] Optionally, in the vascular implant, the buckle is configured to be deformable in the axial direction of the vascular implant, so that the first connecting member can be deformed in the axial direction of the vascular implant.

[0013] Optionally, in the vascular implant, at least a portion of the buckle is made of a metal developing material.

[0014] Optionally, in the vascular implant, the first connecting portion includes more than two first connecting members, and the more than two first connecting members are arranged at intervals along the axial direction of the vascular implant.

[0015] Optionally, in the vascular implant, the buckles of two or more of the first connectors are aligned in the axial direction of the vascular implant.

[0016] Optionally, in the vascular implant, the first connection portion includes more than two first connection groups, and the more than two first connection groups are arranged at intervals along the axial direction of the vascular implant;

[0017] Each of the first connection groups includes more than two first connection members, and the first connection members in each of the first connection groups are arranged at intervals along the axial direction of the vascular implant;

[0018] Wherein: the buckles in the same first connection group are arranged in alignment in the axial direction of the vascular implant, and the buckles in different first connection groups are arranged staggered in the axial direction of the vascular implant.

[0019] Optionally, in the vascular implant, the vascular implant is a self-expanding implant.

[0020] Optionally, in the vascular implant, the vascular implant is a stent, a coil or an aneurysm occlusion device.

[0021] To achieve the above object, the present invention also provides a delivery device for delivering a vascular implant to a target location, including:

[0022] A delivery rod, the delivery rod includes a second connecting portion for detachably engaging with the proximal end of the vascular implant; and

[0023] A chamber for accommodating the delivery rod and the proximal end of the vascular implant;

[0024] When the proximal end of the vascular implant and the delivery rod are accommodated in the chamber, the proximal end of the vascular implant is constrained by the chamber and remains in a state of engagement with the second connecting portion to achieve axial locking between the vascular implant and the delivery rod;

[0025] When the proximal end of the vascular implant is removed from the chamber, the proximal end of the vascular implant is released from the constraint of the chamber and is in a separable state from the second connecting portion to achieve axial unlocking between the vascular implant and the delivery rod.

[0026] Optionally, in the delivery device, the second connecting portion includes at least one second connecting member for detachably engaging with the proximal end of the vascular implant;

[0027] The delivery rod further includes a rod body, and at least one convex portion is formed on the rod body, and the convex portion is the second connecting member, so that the proximal end of the vascular implant is clamped on both sides of at least one of the convex portions or clamped between at least two of the convex portions.

[0028] Optionally, in the delivery device, the second connecting portion includes at least one second connecting member for detachably engaging with the proximal end of the vascular implant;

[0029] The delivery rod further includes a rod body, and at least one concave portion is formed on the rod body, and the concave portion is the second connecting member, so that the proximal end of the vascular implant is clamped in the concave portion.

[0030] Optionally, in the delivery device, the second connecting member has an axially penetrating surface groove for accommodating a part of the vascular implant.

[0031] Optionally, in the conveying device, there are two or more surface grooves arranged circumferentially along the second connecting member.

[0032] Optionally, the proximal end of the vascular implant includes at least one first connecting member for detachably engaging with the second connecting member. The first connecting member includes two or more snap members spaced circumferentially along the vascular implant, and a gap is formed between the two or more snap members.

[0033] When the proximal end of the vascular implant and the delivery rod are engaged and received in the chamber, the surface groove is configured to prevent the snap member from passing through.

[0034] Optionally, in the conveying device, the second connecting portion is made of a metal developing material.

[0035] Optionally, in the conveying device, the conveying device further includes a restraint member including the chamber and disposed outside the delivery rod.

[0036] Optionally, in the conveying device, the conveying device further includes a delivery sheath for loading the vascular implant. The delivery rod is movably inserted into the delivery sheath, and the delivery sheath constitutes the restraint member.

[0037] Optionally, in the conveying device, the conveying device further includes a delivery sheath for loading the vascular implant. The delivery rod is movably inserted into the delivery sheath; the restraint member is movably inserted into the delivery sheath to wrap the proximal end of the vascular implant and the delivery rod.

[0038] To achieve the above object, the present invention further provides a medical device, including: the vascular implant according to any one of the above; and the conveying device according to any one of the above.

[0039] Wherein, the first connecting portion of the vascular implant is detachably engaged with the second connecting portion of the delivery rod.

[0040] In summary, the vascular implant, the conveying device, and the medical device provided by the present invention have the following advantages:

[0041] First, the proximal end of the above-mentioned vascular implant is detachably engaged with the delivery rod of the conveying device, realizing the relative static state of the vascular implant and the delivery rod in the axial direction during the conveying process. In this way, during the conveying process, the vascular implant is not easily dislodged, so that the vascular implant can be stably conveyed, thereby reducing the difficulty of surgical operation and improving the safety and treatment effect of surgical operation.

[0042] Second, the above-mentioned medical device realizes axial locking and unlocking between the vascular implant and the delivery rod through the chamber of the delivery device. This not only makes the locking and unlocking operations convenient, which is beneficial to reducing the difficulty of surgical operations and improving surgical efficiency, but also has high reliability of snap connection, and can preferably achieve axial locking between the vascular implant and the delivery rod.

[0043] Third, the proximal end of the above-mentioned vascular implant preferably includes more than two first connection groups. The more than two first connection groups are arranged at intervals along the axial direction of the vascular implant, and the buckle parts in different first connection groups are arranged staggeredly in the axial direction of the vascular implant. This can enable the buckle parts in different axial directions to be compressed on different circumferences, thereby reducing the compression size of the vascular implant and its delivery device, and enabling the vascular implant to be delivered in a smaller delivery device.

[0044] Fourth, the above-mentioned delivery device preferably includes a restraint, and the restraint provides a chamber. The restraint is preferably movably inserted into the delivery sheath to realize the restraint of the first connection part at the proximal end of the vascular implant. This can achieve the full release and full recovery of the vascular implant. For example, after the vascular implant and its delivery rod are all pushed out of the delivery tube sheath, the vascular implant is fully released at the target position. At this time, the vascular implant and the delivery rod are still not separated, and the vascular implant can be recovered again. When the release condition is met, the restraint and the delivery rod move relative to each other, so that the restraint applied is released, and the vascular implant and the delivery rod are separated, thereby realizing release. Such a setting can improve the accuracy of the release of the vascular implant in the body, thereby improving the treatment effect. Description of the Drawings

[0045] Figure 1 is a schematic structural view of a self-expanding braided stent according to an embodiment of the present invention;

[0046] Figure 2a is a schematic structural view of the proximal end of a self-expanding braided stent according to an embodiment of the present invention, where the proximal end is wire-welded and formed with buckle parts;

[0047] Figure 2b is an enlarged schematic view of the buckle part on the proximal end of a self-expanding braided stent according to an embodiment of the present invention;

[0048] Figures 3a - 3d are respectively schematic structural views of a second connecting member according to an embodiment of the present invention;

[0049] Figure 4 is a schematic structural view of a delivery rod according to Embodiment 1 of the present invention, where the delivery rod includes two second connecting members;

[0050] Figure 5 is a schematic view of the connection between the delivery device and the self-expanding braided stent according to Embodiment 1 of the present invention;

[0051] Figure 6a Schematic diagram of the formation of the gap of the first connecting member in the first embodiment of the present invention;

[0052] Figure 6b Schematic diagram showing that the maximum diameter of the second connecting member in the first embodiment of the present invention is greater than the gap in the first connecting member;

[0053] Figure 7 Enlarged schematic diagram of the snap member at the proximal end of the self-expanding braided stent in the second embodiment of the present invention;

[0054] Figure 8 Schematic diagram of the structure of the delivery rod in the second embodiment of the present invention, wherein the delivery rod includes a second connecting member;

[0055] Figure 9 Schematic diagram of the snap connection between the first connecting member and the second connecting member in the second embodiment of the present invention;

[0056] Figure 10 Schematic diagram of the connection between the delivery device and the self-expanding braided stent in the second embodiment of the present invention, wherein the proximal end of the self-expanding braided stent has not yet disengaged from the delivery sheath;

[0057] Figure 11 Enlarged schematic diagram of the snap member at the proximal end of the self-expanding braided stent in the third embodiment of the present invention;

[0058] Figure 12 Schematic diagram of the connection between the delivery device and the self-expanding braided stent in the third embodiment of the present invention, wherein the proximal end of the self-expanding braided stent has not yet disengaged from the delivery sheath;

[0059] Figure 13 For Figure 12 Enlarged schematic diagram of the snap connection between the self-expanding braided stent and the delivery rod shown;

[0060] Figure 14 Schematic diagram of the connection between the delivery device and the self-expanding braided stent in the fourth embodiment of the present invention, wherein the proximal end of the self-expanding braided stent has not disengaged from the release restraint tube.

[0061] In the figure:

[0062] 1 - stent, 11 - proximal end, 12 - distal end; 13 - snap member; 14, 15 - first connection group; 2 - first connecting member; 3 - second connecting member; 4 - delivery rod; 5 - delivery sheath; 6 - release restraint tube;

[0063] G - surface groove; S1, S2, S - braided wire; Q - welding point.

[0064] In the drawings, the same or similar components are denoted by different reference numerals. Detailed implementation manners

[0065] To make the objectives, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are in highly simplified form and are not drawn to precise scale, merely for the purpose of facilitating and clearly assisting in the description of the objectives of the embodiments of the present invention.

[0066] As used in this specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise. The term "plural" is generally used to include two or more unless the context clearly dictates otherwise. The term "several" is used to include one or more unless the context clearly dictates otherwise.

[0067] In addition, in the following description, for the sake of convenience of description, the terms "distal end" and "proximal end" are used; the "proximal end" is the end closer to the operator of the medical device; the "distal end" is the end farther from the operator of the medical device. Additionally, in the following description, numerous specific details are provided to give a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, well-known technical features are not described to avoid obscuring the present invention.

[0068] The core idea of the present invention is to provide a medical device, including a vascular implant and a delivery device; the vascular implant is delivered to a target location through the delivery device, and the delivery device includes a delivery rod and a chamber.

[0069] The vascular implant of the present invention has a proximal end, and the proximal end includes a first connecting portion. In the delivery device of the present invention, the delivery rod includes a second connecting portion. The first connecting portion is used for detachably engaging with the second connecting portion, so that the vascular implant and the delivery rod remain relatively stationary axially.

[0070] Among them, the first connecting portion and the delivery rod are configured to be received in the chamber. When the first connecting portion and the delivery rod are received in the chamber, the first connecting portion is constrained by the chamber and remains in a latched state with the second connecting portion, thereby achieving axial locking between the vascular implant and the delivery rod. Conversely, when the first connecting portion is disengaged from the chamber, the first connecting portion is released from the constraint of the chamber and is in a separable state from the second connecting portion, ultimately achieving axial unlocking between the vascular implant and the delivery rod. In this way, the vascular implant and the delivery rod achieve a separable mechanical connection, so that during the delivery process, the problem of the vascular implant being unloaded can be avoided, enabling the vascular implant to be stably delivered, thereby reducing the difficulty of surgical operation and improving the safety and therapeutic effect of surgical operation.

[0071] Further, the delivery device further includes a constraint member, and the constraint member includes the chamber, and the constraint member is configured to be disposed outside the delivery rod. In one embodiment, the delivery device further includes a delivery sheath for loading the vascular implant, the delivery rod is movably inserted into the delivery sheath, and the delivery sheath constitutes the constraint member. In one embodiment, the constraint member is a release tube, which is movably inserted into the delivery sheath and sleeved outside the delivery rod to wrap the first connecting portion and the delivery rod. Wherein, the first connecting portion may include one or more than two first connecting members, and one or more than two first connecting members are configured to be detachably latched with the second connecting portion. And the second connecting portion may include one or more than two second connecting members, and one or more than two second connecting members are configured to be detachably latched with the first connecting portion.

[0072] In the present invention, the ways of forming the latching connection mainly include:

[0073] (1) Latching at least one of the first connecting members between at least two of the second connecting members;

[0074] (2) Latching at least one of the second connecting members between at least two of the first connecting members;

[0075] (3) Latching at least one of the first connecting members in at least one of the second connecting members.

[0076] In actual operation, the above ways of forming the latching connection can be used in combination or alone, and are not limited to only achieving a pair of latching connections. Two or more latching connections can also be provided to form a more reliable connection.

[0077] In the present invention, the vascular implant is mainly an implant for treating vascular aneurysms, such as a stent, a coil or an aneurysm occlusion device, etc., and can also be used for the treatment of vascular dilation, vascular embolization capture or other lumen lesions. Taking the restraint member as the delivery sheath as an example, the delivery process of the vascular implant of the present invention specifically includes the following steps:

[0078] First is the loading of the vascular implant: First, the vascular implant is sleeved outside the delivery rod, and then the vascular implant and the delivery rod are loaded into the delivery sheath together. At this time, under the radial restraint of the delivery sheath, the first connecting portion and the second connecting portion are kept in the engaged state, realizing the axial locking between the vascular implant and the delivery rod;

[0079] Then is the delivery of the vascular implant: The delivery rod is used to push the vascular implant so that the whole vascular implant (including the proximal end) is separated from the delivery sheath. Since the radial restraint from the delivery sheath is released, the vascular implant expands (or swells), causing the first connecting portion and the second connecting portion to separate and release the engagement, thereby realizing the release of the vascular implant in the body.

[0080] Among them, the expansion method of the vascular implant after being separated from the delivery sheath can be self-expansion or passive expansion. The "self-expansion" means that the vascular implant has the self-expanding property and can expand or deploy itself after the external force restraint is released; the "passive expansion" means that with the help of an external mechanism, such as an expansion balloon, the vascular implant expands or deploys after the external force restraint is released.

[0081] In an alternative embodiment, the restraint member is a release tube, which is movably inserted into the delivery sheath and sleeved outside the delivery rod. During actual operation, the full release and full recovery of the vascular implant can also be realized by using the release tube. This operation process will be described in detail in the following description. This is convenient for observing the position and state of the implant after implantation and release, and readjusting the implantation position as needed, thereby improving the accuracy of the release of the vascular implant in the body and improving the treatment effect.

[0082] The following further describes the vascular implant and the delivery device proposed by the present invention in conjunction with the accompanying drawings and several embodiments. And hereinafter, it is assumed that the vascular implant is a stent, but those skilled in the art should be able to modify the following description and apply it to cases other than stents.

[0083] Such as Figure 1As shown, the vascular implant may be a stent 1. The stent 1 may be one or a combination of a cut stent and a braided stent, and the stent 1 may be a self-expanding stent or a passively expanding stent. The cut stent may be made of a shape memory material or an elastic material, including but not limited to nitinol. The braided stent may be braided from braided wires made of metal or polymer materials, including but not limited to nitinol, stainless steel, or polymer.

[0084] In the following description, a self-expanding braided stent is mainly used as an example for description. However, those skilled in the art should also be able to modify the following description and apply it to cases where it is not a self-expanding braided stent.

[0085] Continue to refer to Figure 1 , the stent 1 has opposite proximal end 11 and distal end 12. The proximal end 11 of the stent 1 may be formed by binding one or two or more braided wires together, or may be formed by a single wire being back-braided. The present invention does not specifically limit this. Among them, the binding method of the braided wires may be but is not limited to knotting, gluing, welding, etc. In a non-limiting embodiment, as Figure 2a shown, two adjacent braided wires S1 and S2 located at the proximal end 11 may be wire-joined and welded together, and welding points Q may be formed at multiple locations.

[0086] Refer to Figure 2b , and in combination with Figure 2a shown, a single braided wire S1 or S2 and / or two braided wires S1 and S2 may be further wound to form a helical tubular fastener 13. However, an external wire may also be used to wind around the proximal end 11 of the stent 1 to form a helical tubular fastener 13. Alternatively, a tubular fastener 13 may also be directly sleeved on the proximal end 11 to cover the braided wires bound together. The present invention does not particularly limit the setting method of the fastener 13 at the proximal end of the stent 1.

[0087] In this embodiment, the fastener 13 may be a hollow tubular structure, including but not limited to a helical form. The fastener 13 may also be a solid member. For example, a solid cylinder may be directly connected to the proximal end of two braided wires joined and welded together to form the fastener 13. Therefore, the present invention does not particularly limit the structure of the fastener 13, as long as it is convenient to realize the connection between the braided wire and the fastener. In this embodiment, the fastener 13 is preferably tubular and wraps the braided wire. Additionally, the tubular shape is more preferably helical to provide elasticity. When the fastener 13 is a helical tube, it can be compressed and deformed axially on the stent 1 to facilitate clamping, thereby reducing the difficulty of clamping and making the operation more convenient. The fastener 13 may be made of a polymer material or a metal material, including but not limited to stainless steel, nitinol, etc. Preferably, the fastener 13 is made of a radiopaque metal imaging material so as to observe the specific position of the proximal end 11 of the stent 1 during the implantation process.

[0088] In an embodiment of the present invention, the proximal end 11 of the stent 1 includes a first connection portion, and the first connection portion includes at least one first connecting member 2 (see Figure 6a ). The first connecting member 2 is configured to engage with the delivery rod when subjected to the restraining force of the chamber, and to be in a separable state from the delivery rod when the restraining force of the chamber is released. Preferably, the first connecting member 2 includes more than two snap members 13, and the more than two snap members 13 are symmetrically arranged around the axis of the stent 1 (i.e., symmetrically arranged along the circumferential direction of the stent 1, or centrally symmetrically arranged). Thus, a gap is formed between the more than two snap members 13 (such as the position marked d1 in Figure 6a ), and the size of the gap can be converted between a larger size and a smaller size, which is mainly related to the compression and expansion of the stent. Taking the delivery sheath as a restraint member as an example, before the stent 1 is loaded into the delivery sheath, since the stent 1 has not been radially subjected to the restraining force of the chamber, the stent 1 is not compressed and the size of the gap is relatively large, so that the second connecting member 3 of the delivery rod can pass through the gap, facilitating the loading of the stent 1 onto the delivery rod. When the stent 1 is loaded into the delivery sheath in a mating state (engaged) with the delivery rod, since the stent 1 is compressed by the restraining force of the chamber and the size of the gap is reduced, the second connecting member 3 of the delivery rod cannot axially pass through the gap at this time. Therefore, the maximum size (e.g., diameter) of the gap at this time is smaller than the size (e.g., diameter) of the second connecting member 3, ensuring that the first connecting member 2 at the proximal end of the stent and the second connecting member 3 at the distal end of the delivery rod remain in an engaged state and do not separate, thereby achieving axial locking between the delivery rod and the stent 1, and further enabling the delivery of the stent 1 in the delivery sheath through the delivery rod. When the restraining force of the chamber is released, the stent 1 expands and the first connecting member 2 can be separated from the second connecting member 3, realizing axial unlocking between the delivery rod and the stent 1.

[0089] Further, referring to Figures 3a to 3d , and in combination with Figure 4 , the delivery device includes a delivery rod 4. The delivery rod 4 includes a second connection portion, and the second connection portion includes at least one second connecting member 3. In this embodiment, the delivery rod 4 further includes a rod body, and at least one second connecting member 3 is formed on the rod body. In some embodiments, at least one convex portion is formed on the rod body, and the convex portion constitutes the second connecting member 3, such that at least one first connecting member 2 can be engaged between at least two convex portions, or at least two second connecting members 3 can be engaged on opposite sides of at least one convex portion. In some embodiments, at least one concave portion is formed on the rod body, and the concave portion constitutes the second connecting member 3, such that at least one first connecting member 2 can be engaged in at least one concave portion.

[0090] In the following description, it is assumed that the second connecting member 3 is a convex portion to further illustrate the snap connection between the first connecting portion and the second connecting portion, which is easy to implement. However, those skilled in the art should be able to modify the following description and apply it to cases that are not convex portions.

[0091] Combined Figure 2b , in actual application, when the stent 1 is radially constrained by the delivery sheath, each buckle member 13 overlaps on the second connecting member 3 to form a snap connection and is constrained by the delivery sheath and cannot be released. This snap-type physical connection can provide more stable delivery. Moreover, when the buckle member 13 is pushed out of the delivery sheath, the constraint from the delivery sheath is released, enabling the buckle member 13 to be disengaged from the second connecting member 3. Such a release method is also very convenient and fast, and the structure is simple, enabling the rapid release of the stent 1.

[0092] Compared with the prior art, the stent 1 is transported in the delivery sheath through a mechanical connection with the delivery rod. In this way, the stent 1 is not easily detached during transportation, thereby improving the stability of stent delivery. Moreover, the structure of the snap connection is simple, and locking and unlocking are also relatively convenient.

[0093] Continue to refer to Figures 3a to 3c , in some embodiments, the second connecting member 3 has an axially penetrating surface groove, but the surface groove can be formed by notches as shown in Figure 3b or Figure 3c , or can be defined by adjacent protrusions as shown in Figure 3a . As shown in Figure 3d , in other embodiments, the second connecting member 3 can also be a column with a smooth surface, but the shape of the cross-section of the column is not limited and can be circular, square, rectangular or irregular. The second connecting member 3 can be a solid member or a tubular member, and the tubular member can also be spiral. The second connecting member 3 can be made of a polymer material or a metal material, including but not limited to stainless steel, nitinol alloy, etc. Preferably, the second connecting member 3 is made of a radiopaque metal imaging material so as to observe its position and its axial relative position with the delivery sheath during the implantation process to judge the release state of the stent 1.

[0094] Furthermore, there are two or more of the surface grooves and they are arranged around the axis of the second connecting member 3 (i.e., arranged at intervals along the circumferential direction of the second connecting member 3, and more preferably symmetrically arranged along the circumferential direction of the second connecting member 3). Then, through the surface grooves on the second connecting member 3, a part of the braided wire at the proximal end 11 of the stent 1 can be received in the surface grooves during snap connection. On the one hand, the diameter of the stent 1 after compression can be reduced, thereby reducing the diameter of the delivery sheath. On the other hand, the stent 1 and the delivery rod can be further constrained, thereby further improving the stability of stent delivery.

[0095] Further, the proximal end 11 of the stent 1 includes a plurality of meshes, and snap members 13 are provided at the ends of at least some of the meshes. That is, it is not necessary to provide snap members 13 on all the meshes at the proximal end of the stent. A first connecting member 2 includes more than two snap members 13 on different meshes, and the snap members 13 in each first connecting member 2 are symmetrically arranged on the same circumference.

[0096] The following further describes the manner in which the first connecting member 2 and the second connecting member 3 form a snap connection. However, the following description is not a limitation on the present invention, and any transformation made on the basis of the following content is within the protection scope of the present invention.

[0097] Embodiment 1

[0098] As Figure 4 shown, in this embodiment, the delivery rod 4 includes a second connecting portion, and the second connecting portion includes at least two second connecting members 3. The at least two second connecting members 3 are spaced apart axially on the rod body. Assuming that there are two second connecting members 3, the axial distance between the two second connecting members 3 is configured to allow at least one first connecting member 2 to be engaged. Since the first connecting member 2 can be an elastic member, it can be compressed between the two second connecting members 3. Therefore, the axial distance between the two second connecting members 3 can be less than or equal to the axial length of the first connecting member 2 (i.e., the length before compression). However, the first connecting member 2 can also be a rigid member without elasticity, that is, it cannot be deformed. At this time, the axial distance between the two second connecting members 3 can be greater than or equal to the axial length of the first connecting member 2, and in order to avoid a large displacement in the axial direction, the gap between the two second connecting members 3 and the first connecting member 2 should not be too large. However, the second connecting member 3 can also be an elastic member, which is convenient to engage a first connecting member 2 by deformation. Therefore, the axial distance between the two second connecting members 3 can also be less than or equal to the axial length of the first connecting member 2.

[0099] As Figure 5 shown, and in combination with Figure 2b shown, the first connecting member 2 includes four snap members 13 spaced apart on the same circumference. Each snap member 13 is provided on the braided wire at the proximal end 11 of the stent 1, and the structures of these snap members 13 can be the same or different, and can also be aligned or not aligned at both ends. The delivery device further includes a delivery sheath 5. During actual operation, as Figure 5 shown, within the delivery sheath 5, the entire stent 1 is compressed so that the four snap members 13 at the proximal end 11 are also compressed and engaged between the two second connecting members 3. That is, one of the second connecting members 3 is engaged with the proximal end of the first connecting member 2, and the other second connecting member 3 is engaged with the distal end of the first connecting member 2. Therefore, the movement of the stent 1 is blocked from two opposite directions.

[0100] In addition, the surface groove is formed on the outer surface of the second connecting member 3, so that the braided wires at the proximal end 11 of the stent 1 are connected into a whole and then embedded in the surface groove of the second connecting member 3 at the distal end. Therefore, the structures of the two second connecting members 3 can be different or the same. Preferably, a surface groove is provided on one second connecting member 3 located at the distal end, and the other may not be provided with a surface groove.

[0101] As Figure 6a and Figure 6b shown, when the stent 1 is compressed in the delivery sheath 5 (i.e., the stent 1 is in the fully compressed state), a gap is formed between the four buckle members 13 (i.e., the d1 marked in the figure); when the gap is a regular figure, such as a circle, the diameter d2 (e.g., the maximum dimension) of the second connecting member 3 needs to be greater than the diameter d1 of the gap; and when the gap is an irregular figure, the diameter d2 of the second connecting member 3 needs to be greater than the maximum dimension of the gap; doing so can ensure that the second connecting member 3 will not slip out of the gap during pushing.

[0102] Continue to refer to Figure 6a and Figure 6b shown, when the stent 1 is in the fully compressed state, the radial distance L1 of the surface groove can be equal to or greater than the radial distance (d1 / 2) of the gap, and the radial distance L1 of the surface groove can also be less than the radial distance (d1 / 2) of the gap, that is, there is no special limitation on the depth of the surface groove. However, in order to prevent the buckle member 13 from entering the surface groove and slipping, the size of the surface groove is preferably configured to prohibit the buckle member 13 from passing through, and preferably, the maximum dimension of the surface groove along the circumferential direction of the second connecting member 3 is designed to be less than the minimum dimension of the buckle member 13 along the circumferential direction of the stent 1.

[0103] Therefore, during actual operation, as Figure 5 shown, when withdrawing the delivery rod 4 (i.e., in the proximal direction), one second connecting member 3 located at the distal end restricts the first connecting member 2, so that no relative movement occurs between the first connecting member 2 and the delivery rod 4; conversely, when pushing the delivery rod 4 forward (i.e., in the distal direction), one second connecting member 3 located at the proximal end restricts the first connecting member 2, so that no relative movement occurs between the first connecting member 2 and the delivery rod 4 either.

[0104] Embodiment 2

[0105] As Figure 7 and Figure 8As shown, in this embodiment, the second connection portion of the conveying rod 4 includes at least one second connecting member 3. At the same time, the first connection portion of the proximal end 11 of the bracket 1 includes at least two first connecting members 2, and the at least two first connecting members 2 are arranged at intervals along the axial direction at the proximal end of the bracket 1. Hereinafter, it is assumed that there are two first connecting members 2. The axial distance between the two first connecting members 2 is configured to allow at least one second connecting member 3 to be engaged. Here, the axial distance between the two first connecting members 2 may be greater than the axial length of the second connecting member 3, or may be less than or equal to the axial length of the second connecting member 3. For example, the first connecting member 2 is an elastic member and can be stretched or compressed.

[0106] As Figure 9 shown, during actual operation, inside the delivery sheath 5, one second connecting member 3 is engaged between the two first connecting members 2, and the braided wire S located between the two first connecting members 2 is inserted into the surface groove G on the second connecting member 3. Further, during the conveying process, if the bracket 1 is pushed forward (i.e., towards the distal end), the second connecting member 3 will block one of the first connecting members 2 at the proximal end, ensuring that there is no relative movement between the bracket 1 and the conveying rod 4; conversely, if the bracket 1 is retracted, the second connecting member 3 blocks one of the first connecting members 2 at the distal end. By doing so, there is no relative movement between the bracket 1 and the conveying rod 4 during both the conveying and recovery of the bracket 1, enabling the bracket 1 to be stably conveyed.

[0107] Furthermore, as Figure 10 shown, if the bracket 1 is to be released, as long as the bracket 1 is pushed forward until the proximal end 11 of the bracket 1 is completely pushed out of the delivery sheath 5, the first connecting member 2 can be popped out radially outward to release the engagement, thus releasing the bracket 1. Therefore, the disengagement is also convenient.

[0108] Embodiment Three

[0109] In this embodiment, the first connection portion at the proximal end of the bracket includes more than two first connection groups. The more than two first connection groups are arranged at intervals along the axial direction of the bracket 1, and each first connection group includes more than two first connecting members 2. The more than two first connecting members 2 in each first connection group are arranged at intervals along the axial direction of the bracket 1, and the buckle members 13 in the same first connection group are arranged in alignment along the axial direction of the bracket 1. Axial alignment means that in the same projection plane perpendicular to the axis of the bracket, the axial projections of the buckle members 13 in the same first connection group coincide.

[0110] Furthermore, the inventor found that when the radial dimension of the first connecting member 2 is large or the number of the snap members 13 is large, the compression dimension of the stent 1 and its delivery device is too large. To solve this problem, the snap members 13 in different first connection groups are arranged staggeredly in the axial direction of the stent 1, so that the snap members 13 in different first connection groups can be compressed on different circumferences, thereby reducing the compression dimension, and further reducing the dimension of the delivery sheath 5, facilitating the delivery of the stent 1 in a smaller delivery sheath.

[0111] As Figure 11 shown, in this embodiment, the number of the first connection groups is two, namely the first connection groups 14 and 15. And for the sake of clarity, the two first connection groups 14 and 15 are defined by dotted lines in the figure. The two first connection groups 14 and 15 are arranged at intervals in the axial direction of the stent 1, and the snap members 13 in the two first connection groups 14 and 15 are arranged staggeredly in the axial direction. Here, being arranged staggeredly in the axial direction means that in the same projection plane perpendicular to the axis of the stent, the axial projections of the snap members 13 in the two first connection groups 14 and 15 do not coincide.

[0112] More specifically, the first connection group 14 includes two first connecting members 2 arranged in sequence from far to near. The two first connecting members 2 are arranged at intervals in the axial direction of the stent 1, and the snap members 13 of the two first connecting members 2 are arranged in alignment in the axial direction. Similarly, the first connection group 15 includes two first connecting members 2 arranged in sequence from far to near. The two first connecting members 2 are also arranged at intervals in the axial direction of the stent 1, and the snap members 13 of the two first connecting members 2 are arranged in alignment in the axial direction.

[0113] Taking the example that each first connecting member 2 includes two snap members 13, as Figure 11 shown, from far to near, the first, second, third, and fourth first connecting members 2 are sequentially arranged at the proximal end 11 of the stent 1. The two snap members 13 in the first first connecting member 2 at the farthest end are arranged in alignment in the axial direction with the two snap members 13 in the adjacent second first connecting member 2, and the third first connecting member 2 and the fourth first connecting member 2 at the nearest end are arranged in the same way as the previous two first connecting members 2, but the snap members 13 of the latter two first connecting members 2 are arranged staggeredly in the axial direction with the snap members 13 of the previous two first connecting members 2. Such an arrangement makes the axial positions of the snap members 13 different in the circumferential direction (i.e., arranged staggeredly in the axial direction), so that the dimension of the stent 1 compressed in the delivery sheath 5 is smaller, enabling the stent 1 to be delivered in a delivery sheath with a smaller dimension.

[0114] In this embodiment, as Figure 4 shown, the delivery rod 4 includes two second connecting members 3, which are respectively engaged and connected with the two first connection groups 14 and 15. As Figure 12 and Figure 13As shown, a second connecting member 3 is provided between two first connecting members 2 at the proximal end, and another second connecting member 3 is provided between two first connecting members 2 at the distal end, thereby restricting the relative position between the stent 1 and the delivery rod 4, and achieving a stable and reliable connection while reducing the size.

[0115] Embodiment 4

[0116] The structures of the stent and the delivery device in this embodiment are basically the same as those in the above embodiment, and only the differences will be described below.

[0117] In this embodiment, as Figure 14 shown, the delivery device further includes a release restraint tube 6, which is movably disposed inside the delivery sheath 5 and sleeved outside the delivery rod 4 to achieve full release and full recovery of the stent 1. Here, the release restraint tube 6 constitutes the restraint member.

[0118] Specifically, after the entire stent 1 is pushed out of the delivery sheath 5, the stent 1 is fully released at the target position. At this time, the proximal end 11 of the stent is still not separated from the delivery rod 4. If the ideal release state has not been reached (for example, the stent is not fully released or released), the stent 1 can still be fully or partially recovered into the delivery sheath 5 by retracting the delivery rod 4. When the release condition is met (for example, the release position is confirmed to be correct), the release restraint tube 6 and the delivery rod 4 move relative to each other. For example, the operator operates the delivery rod 4 to move forward (towards the distal end), while keeping the release restraint tube 6 stationary, or the release restraint tube 6 is retracted but the delivery rod 4 remains stationary, so that the restraint exerted by the release restraint tube 6 on the proximal end 11 of the stent 1 is released, and the stent 1 is separated from the delivery rod 4, thereby achieving release. Compared with the prior art, the present invention can fully recover the stent 1 (except for the proximal end 11) after full release, until the ideal release position and release state are reached, and then the proximal end 11 of the stent 1 is released from the delivery rod 4. Such a setting can improve the accuracy of stent 1 release in the body, thereby improving the treatment effect.

[0119] More specifically, the release restraint tube 6 wraps the second connecting member 3 and the first connecting member 2, so that the second connecting member 3 and the first connecting member 2 are kept in a clamped state. When there is no relative displacement between the delivery rod 4 and the release restraint tube 6, the stent 1 and the delivery rod 4 are clamped and connected. When the release restraint tube 6 moves proximally relative to the delivery rod 4, the proximal end 11 of the stent 1 loses radial restraint from the first connecting member 2, and the stent 1 itself has the property of self-expansion. Therefore, the proximal end 11 of the stent 1 springs open radially from the second connecting member 3, and the proximal end 11 of the stent 1 is separated from the delivery rod 4, thereby achieving release.

[0120] In this embodiment, it is only necessary that the distal end of the release restraint tube 6 extends to the proximal end 11 of the stent 1, as long as the first connecting member 2 can be restrained, and the proximal end of the release restraint tube 6 extends out of the proximal end of the delivery sheath 5 to facilitate the operation of the operator. In addition, the material of the release restraint tube 6 is not limited and can be a polymer material or a metal material.

[0121] In addition, it should be noted that when a second connecting member 3 is engaged between two first connecting members 2, while the two first connecting members 2 are axially spaced apart, their buckle members 13 can be arranged axially aligned or axially staggered. If they are axially staggered, it is beneficial to reduce the compression size.

[0122] The above embodiments have described in detail how to connect the stent and the delivery rod. Of course, the present invention includes but is not limited to the connection methods listed in the above embodiments. Any content obtained by changing on the basis of the connection methods provided in the above embodiments belongs to the scope protected by the present invention. Those skilled in the art can draw inferences by analogy according to the content of the above embodiments.

[0123] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure are within the scope of protection of the claims.

Claims

1. A medical device, characterized in that, Comprising: A vascular implant; and a delivery device; the vascular implant is delivered to a target location through the delivery device; the delivery device includes a delivery rod and a chamber; the vascular implant has a proximal end, and the proximal end includes a first connection portion; the delivery rod includes a second connection portion; the first connection portion is detachably snap-connected to the second connection portion; The first connection portion includes at least one first connecting member; the first connecting member includes more than two snap members, and the more than two snap members are arranged at intervals around the circumference of the vascular implant, and a gap is formed between the more than two snap members; the second connection portion includes at least one second connecting member; the first connecting member is detachably snap-connected to the second connecting member; the second connecting member has axially penetrating surface grooves, and the surface grooves are more than two and arranged along the circumference of the second connecting member; when the first connecting member and the second connecting member are snap-connected, part of the braided wires at the proximal end of the vascular implant are embedded in the corresponding surface grooves; When the first connection portion and the delivery rod are received in the chamber, the first connecting member is restricted by the chamber, so that the gap prohibits the delivery rod and the second connecting member from passing through, and keeps the first connecting member and the second connecting member in a snap-connected state to achieve axial locking between the vascular implant and the delivery rod, and the first connecting member is snap-connected between two second connecting members arranged at intervals along the axis of the delivery rod, or the second connecting member is snap-connected between two first connecting members arranged at intervals along the axis of the vascular implant; When the first connection portion is disengaged from the chamber, the first connecting member is released from the restriction of the chamber, so that the gap allows the second connecting member to pass through, and makes the first connecting member and the second connecting member in a separable state to achieve axial unlocking between the vascular implant and the delivery rod.

2. The medical device according to claim 1, wherein The snap member is configured to be deformable in the axial direction of the vascular implant, so that the first connecting member is deformable in the axial direction of the vascular implant.

3. The medical device according to claim 1, characterized in that, At least part of the snap members are made of a metal developing material.

4. The medical device according to any one of claims 1-3, characterized in that, The first connection portion includes more than two first connecting members, and the more than two first connecting members are arranged at intervals along the axis of the vascular implant.

5. The medical device according to claim 4, characterized in that, The snap members in more than two first connecting members are arranged in alignment in the axial direction of the vascular implant.

6. The medical device according to any one of claims 1-3, characterized in that, The first connection portion includes more than two first connection groups, and the more than two first connection groups are arranged at intervals along the axis of the vascular implant; Each first connection group includes more than two first connecting members, and the first connecting members in each first connection group are arranged at intervals along the axis of the vascular implant; Wherein: the snap members in the same first connection group are arranged in alignment in the axial direction of the vascular implant, and the snap members in different first connection groups are arranged offset in the axial direction of the vascular implant.

7. The medical device according to claim 1, wherein The vascular implant is a self-expanding implant.

8. The medical device according to claim 1, characterized in that, The vascular implant is a stent, a coil or an aneurysm occlusion device.

9. The medical device according to claim 1, wherein The conveying rod further includes a rod body, at least one convex portion is formed on the rod body, and the convex portion is the second connecting member, so that the first connecting member is clamped on both sides of at least one convex portion or between at least two convex portions.

10. The medical device according to claim 1, wherein, The conveying rod further includes a rod body, at least one concave portion is formed on the rod body, and the concave portion is the second connecting member, so that the first connecting member is clamped in the concave portion.

11. The medical device according to claim 1, wherein When the first connecting member and the second connecting member are clamped and received in the chamber, the surface groove is configured to prevent the buckle member from passing through.

12. The medical device according to claim 1, wherein, The second connecting portion is made of a metal developing material.

13. The medical device according to claim 1, wherein, The conveying device further includes a restraint member, the restraint member includes the chamber and is disposed outside the conveying rod.

14. The medical device according to claim 13, characterized in that, The conveying device further includes a delivery sheath for loading the vascular implant, the conveying rod is configured to be movably inserted into the delivery sheath, and the delivery sheath constitutes the restraint member.

15. The medical device according to claim 13, characterized in that, The conveying device further includes a delivery sheath for loading the vascular implant, the conveying rod is configured to be movably inserted into the delivery sheath; the restraint member is configured to be movably inserted into the delivery sheath to wrap the proximal end of the vascular implant and the conveying rod.

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