Medical device post-implantation release device

Abstract

The present invention provides a post-release device for medical device implants, which relates to the field of medical devices. A first central hole is provided in a first locking part, a first groove is provided on the circumference of the rear end of the first locking part, and a first curved surface is formed on the top surface of the first groove body; a second central hole is provided in a second locking part, the second central hole is connected to the lumen of the slender tube, a second groove is provided on the circumference of the front end of the second locking part, and a second curved surface is formed on the top surface of the second groove body, and an anti-drop limiter is connected to the front end of the second locking part; in the locked state, the first curved surface and the second curved surface are interlocked, the front end of the control cable passes through the first central hole and the second central hole, and the anti-drop limiter cooperates with the control cable to limit the front end of the second locking part to the inside of the first groove. The present invention at least alleviates the problem that in the existing post-release device for mechanically detachable medical device implants, once the medical device implant is detached from the delivery tube, it can no longer be withdrawn into the delivery tube, which may cause mis-bolting.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a post-implantation release device for medical devices. Background Art

[0002] Percutaneous transcatheter embolization is defined as the intravascular deposition of a device or agent (solid or liquid) that produces intentional vascular occlusion. Occlusion of embolic vessels can be performed at any level, from large arteries or veins to capillary beds, and embolization can be temporary or permanent in nature. During the procedure, embolic material is injected or delivered into the target vessel via a catheter to occlude the vessel and achieve the desired therapeutic purpose.

[0003] Through embolization, congenital or acquired abnormal vasculature can be eliminated, thereby improving clinical conditions. This method has also been used for occlusion of normal vasculature to relieve tumors and tissue ablation. These normal or abnormal vessels can cause massive bleeding or hemodynamic disorders. With the advent of more advanced hardware such as microcatheters, embolic materials and high-resolution digital imaging, this method has been recognized for its safety and effectiveness. Due to the continuous improvement of physician expertise and the low incidence of surgical complications, it has become the preferred treatment for certain diseases.

[0004] Embolic materials include mechanical embolic materials, which are generally made of stainless steel, platinum and nickel-titanium alloys and wrapped with polymer fibers. They are called medical device implants in embolization. Medical device implants can be divided into pushable and detachable types according to the delivery or release method (Deployment Mechanism). Push-type medical device implants consist of preloaded implants inserted into catheters. After insertion, the implants can be pushed into place by implant pushers or guide wires, or saline injections can be used to deliver the implants to the appropriate location. The release methods of detachable medical device implants include electrolytic release, water (hydraulic) release and mechanical release. For electrolytic release medical device implants, their stability after release failure is higher than that of hydrolytic release and mechanical release, but their release time is longer, the release area is hard, and the incidence of complications is higher; for hydrolytic release medical device implants, their release is rapid and the microcatheter head is slightly offset during release, which makes it easy to achieve precise positioning of the implant, but the impact of water flow will have a displacement effect on the implantation of the medical device implant; for mechanical release medical device implants, their release time is short, and the catheter head is stable and displaced during release, without the impact force generated by the hydrolytic release method; after comprehensive comparison, it can be seen that the mechanical release method has the lowest risk.

[0005] Studies have shown that traditional push-type medical device implants cannot be withdrawn in time when the implantation position is inappropriate, so they are gradually being replaced by detachable medical device implants. Among them, mechanically detachable medical device implants have the advantages of good softness, simple operation, high success rate, and strong controllability, and are gradually being adopted by interventional physicians.

[0006] Existing mechanically detachable medical device implant post-release devices mainly include a delivery tube, a control cable and a locking assembly. Specifically, in a type of mechanically detachable medical device implant post-release device in the prior art, the delivery tube includes a microcatheter and a slender tube, the slender tube passes through the microcatheter, the control cable passes through the slender tube and there is a large friction between the control cable and the slender tube, the locking assembly includes a first locking part connected to the rear end of the medical device implant and a second locking part connected to the front end of the slender tube, and the control cable locks the first locking part to the second locking part; before release, the first locking part and the second locking part are both located inside the microcatheter, and as the microcatheter is relatively close to each other, the first locking part and the second locking part are locked. By pushing the slender tube forward, the first locking part and the second locking part can be slowly pushed out of the microcatheter, and then the control cable is withdrawn backward relative to the microcatheter, so as to separate the first locking part from the second locking part to release the medical device implant; the more detailed structure is: the first locking part and the second locking part are both tubular structures with grooves on the tube wall, the grooves are connected to the tube cavity, and the top surface of the groove body is a corrugated surface extending along the axial direction of the tubular structure. Before release, the top surface of the corrugated groove body of the first locking part and the top surface of the corrugated groove body of the second locking part are mutually buckled, The control cable passes through the lumen of the slender tube, the lumen of the second locking part and the lumen of the first locking part. When release is required, the medical device implant can be released by withdrawing the control cable, and then the slender tube can be withdrawn from the body. In another type of release device that can mechanically release the medical device implant in the prior art, the control cable passes through a microcatheter or a slender tube as a delivery tube, and the locking assembly includes a first locking part connected to the rear end of the medical device implant and a second locking part connected to the front end of the control cable. Before release, the first locking part and the second locking part are both located inside the delivery tube and the first locking part and the second locking part are interlocked with each other. As the control cable is pushed forward relative to the delivery tube, the first locking part and the second locking part can be slowly pushed out of the delivery tube, and then the first locking part is separated from the second locking part to release the medical device implant. The more detailed structure is mostly: the first locking part and the second locking part are hook structures that are interlocked, or the first locking part and the second locking part not shown are mutually matched protrusion and groove structures, and the protrusion can be but not limited to a spherical protrusion, etc.

[0007] The following is further explained in the order of examples of the above-mentioned prior art as the first prior art structure and the second prior art structure: in the prior art, in the first prior art structure, the mutually interlocking portion of the first locking portion and the second locking portion in the locking assembly is a simple mutual interlocking between grooves, and the control cable passes through the groove portion of the first locking portion and the second locking portion, and the first locking portion and the second locking portion cannot be firmly limited. Once the first locking portion and the second locking portion are pushed out of the microcatheter, the first locking portion and the second locking portion become loose, affecting the selection and control of the implantation angle, and due to the misalignment caused by the loosening between the first locking portion and the second locking portion, the medical device implant cannot be withdrawn into the interior of the microcatheter; in the second prior art structure, it is even more impossible to withdraw the medical device implant into the delivery tube after the first locking portion is pushed forward.

[0008] In summary, the existing mechanically detachable medical device implant release device has at least one problem: once the medical device implant is detached from the delivery tube, it cannot be withdrawn into the delivery tube, which may cause the problem of accidental embolism. After accidental embolism, the wrongly released medical device implant can only be removed from the human body by another loop method or other methods. The operation is complicated, not conducive to the rapid completion of the operation, and it is easy to increase the surgical trauma. Summary of the invention

[0009] The object of the present invention is to provide a post-release device for a medical device implant, so as to at least alleviate the problem in existing post-release devices for mechanically detachable medical device implants that once the medical device implant is detached from a delivery tube, it can no longer be withdrawn into the delivery tube, which may cause accidental occlusion.

[0010] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0011] An embodiment of the present invention provides a post-implantation release device for a medical device, comprising a microcatheter, a slender tube, a control cable, and a locking assembly; the slender tube passes through the microcatheter, the control cable is installed in the slender tube, and the rear end of the control cable is fixed to the slender tube, the locking assembly comprises a first locking portion and a second locking portion, the first locking portion is used to be connected to the rear end of the medical device implant, and the second locking portion is connected to the front end of the slender tube;

[0012] A first center hole axially penetrating the first locking portion is provided inside the first locking portion, a first slot communicating with the first center hole is provided on the radial circumferential surface of the rear end of the first locking portion, and a top surface of the first slot is formed as a first curved surface extending along the axial direction of the first locking portion;

[0013] A second center hole axially penetrating the second locking portion is provided inside the second locking portion, the second center hole is communicated with the tube cavity of the elongated tube, a second groove communicated with the second center hole is provided on the radial circumferential surface of the front end of the second locking portion, the top surface of the groove body of the second groove is formed as a second curved surface extending along the axial direction of the second locking portion, and an anti-drop limit portion is connected to the front end of the second locking portion;

[0014] In the locked state, the first curved surface and the second curved surface are interlocked with each other, the front end of the control cable passes through the first center hole and the second center hole, and the anti-drop limit portion cooperates with the control cable to limit the front end of the second locking portion inside the first groove.

[0015] In an optional embodiment, the anti-drop limit portion includes a limit block connected to the inside of the second groove, and a limit hole axially passing through the limit block is opened on the limit block; in the locked state, the control cable passes through the limit hole.

[0016] In an optional embodiment, with the axis of the second locking portion as the longitudinal direction, the anti-drop limit portion includes a limit rod laterally connected to the wall surface of the second groove; in the locked state, the front end of the control cable passes through the area between the limit rod and the bottom surface of the second groove.

[0017] Further optionally, a card interface is provided on the top surface of the groove body on both axial sides of the second groove, and the two ends of the limit rod are card-connected to the inside of the card interface on the corresponding side in a one-to-one correspondence.

[0018] In an optional embodiment, the first center hole passes through the rear end surface of the first slot.

[0019] In an optional implementation, the diameter of the front end of the control cable is d1, and the diameter of the first center hole is d2, then d2-d1≤0.5 mm.

[0020] In an optional embodiment, the second locking portion is integrally formed with the slender tube; and / or the first locking portion includes a main body and a connecting portion that are integrally connected, the first center hole passes through the main body and the connecting portion, the first groove is arranged on the main body, and the connecting portion is used to be inserted into and fixedly connected to the rear end of the medical device implant.

[0021] In an optional embodiment, at least one tube cutting groove extending along the axial direction of the slender tube is opened on the tube wall of the slender tube.

[0022] In an optional embodiment, a breaking portion for breaking the slender tube is provided at the rear end of the slender tube.

[0023] In an optional embodiment, a control cable fixing groove connected to the tube cavity of the slender tube is opened on the tube wall at the rear end of the slender tube, and the rear end of the control cable is fixedly connected to the inner wall of the control cable fixing groove; the breaking portion is arranged at the rear end of the slender tube and is located at the front end of the control cable fixing groove.

[0024] The embodiments of the present invention can achieve the following beneficial effects:

[0025] An embodiment of the present invention provides a post-release device for a medical device implant, which includes a microcatheter, a slender tube, a control cable and a locking assembly; the slender tube passes through the microcatheter, the control cable is installed in the slender tube and the rear end of the control cable is fixed to the slender tube, the locking assembly includes a first locking part and a second locking part, the first locking part is used to connect to the rear end of the medical device implant, and the second locking part is connected to the front end of the slender tube.

[0026] Wherein: a first center hole axially penetrating the first locking part is provided inside the first locking part, a first groove connected with the first center hole is provided on the radial circumferential surface of the rear end of the first locking part, and the top surface of the groove body of the first groove is formed as a first curved surface extending axially along the first locking part; a second center hole axially penetrating the second locking part is provided inside the second locking part, the second center hole is communicated with the tube cavity of the slender tube, a second groove connected with the second center hole is provided on the radial circumferential surface of the front end of the second locking part, the top surface of the groove body of the second groove is formed as a second curved surface extending axially along the second locking part, and an anti-drop limiting part is connected to the front end of the second locking part; in the locked state, the first curved surface and the second curved surface are interlocked with each other, the front end of the control cable passes through the first center hole and the second center hole, and the anti-drop limiting part cooperates with the control cable to limit the front end of the second locking part to the inside of the first groove.

[0027] In the embodiment of the present invention, by providing the above-mentioned anti-drop limit portion, the space for the control cable to swing up and down and left and right relative to the first groove and the second groove can be limited, thereby improving the locking stability of the control cable to the first locking portion and the second locking portion in the locked state. At the same time, after the first locking portion and the second locking portion are extended out of the tube, the front end of the second locking portion is prevented from falling out of the first groove of the first locking portion, causing the front end of the second locking portion and the first locking portion to be misaligned with each other. Since the control cable is installed in the slender tube and the rear end of the control cable is fixed to the slender tube, the medical device implant can be withdrawn into the interior of the microcatheter by withdrawing the slender tube. After the accurate release position is determined, the fixed relationship between the rear end of the control cable and the slender tube is released, and the control cable is withdrawn to release the medical device implant, so as to achieve the purpose of avoiding accidental occlusion.

[0028] In summary, the embodiments of the present invention at least alleviate the problem of the existing mechanically detachable medical device implant rear release device, that once the medical device implant is detached from the delivery tube, it can no longer be withdrawn into the delivery tube, which may cause mis-engagement. At the same time, it can enhance the locking stability of the first locking part and the second locking part in the mutually locked state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of the first existing mechanically detachable medical device implant post-release device;

[0031] Figure 2 It is a schematic diagram of the overall structure of a second existing post-implantation release device for a mechanically detachable medical device;

[0032] Figure 3 A schematic diagram of a first optional structure of a post-implantation release device for a medical device provided in an embodiment of the present invention, wherein the first locking portion is not shown;

[0033] Figure 4 for Figure 3 A schematic diagram of the front end structure of the medical device implant rear release device in a state where the medical device implant is not released;

[0034] Figure 5 for Figure 3 A schematic diagram of the front end structure of the medical device implant post-release device in a state of releasing the medical device implant;

[0035] Figure 6 A schematic diagram of a second optional structure of the post-implantation release device for a medical device provided in an embodiment of the present invention;

[0036] Figure 7 for Figure 6 A schematic diagram of the overall structure of a slender tube of a release device after implantation of a medical device;

[0037] Figure 8 for Figure 6 A schematic diagram of the front end structure of the slender tube in a locking state of the control cable and the slender tube in a release device after implantation of the medical device;

[0038] Fig. 9 for Figure 6A schematic diagram of the front end structure of the medical device implant rear release device in a state where the medical device implant is not released;

[0039] Fig.10 for Figure 6 A schematic diagram of the front end structure of the medical device implant post-release device in a state of releasing the medical device implant;

[0040] Fig.11 An exploded view of the assembly structure of the first locking portion and the medical device implant in the locking assembly of the medical device implant rear release device provided in an embodiment of the present invention.

[0041] Icons: 100-medical device implant; 1-microcatheter; 2-slender tube; 201-tube cutting groove; 202-breaking part; 203-control cable fixing groove; 3-control cable; 4-first locking part; 41-main body; 42-connecting part; 400-first center hole; 401-first curved surface; 5-second locking part; 501-second curved surface; 502-card interface; 61-limit block; 62-limit rod. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "lateral", "longitudinal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] In addition, the term "front end" refers to the end away from the doctor during surgery, and the term "rear end" refers to the end close to the doctor during surgery; the terms "transverse" and "longitudinal" do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "transverse" only means that its direction is more horizontal than "longitudinal", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] Existing mechanically detachable post-release devices for medical device implants mainly include a delivery tube, a control cable, and a locking assembly. Specifically, in a type of mechanically detachable post-release devices for medical device implants in the prior art, the delivery tube includes a microcatheter and a slender tube, the slender tube passes through the microcatheter, the control cable passes through the slender tube, and there is a large friction between the control cable and the slender tube, the locking assembly includes a first locking part connected to the rear end of the medical device implant and a second locking part connected to the front end of the slender tube, and the control cable locks the first locking part to the second locking part; before release, the first locking part and the second locking part are both located inside the microcatheter, and as the slender tube is pushed forward relative to the microcatheter, the first locking part and the second locking part can be slowly pushed out of the microcatheter, and then the control cable is withdrawn backward relative to the microcatheter, thereby separating the first locking part from the second locking part to release the medical device implant; more detailed structures are as follows. Figure 1As shown, the first locking part 4 and the second locking part 5 are both tubular structures with grooves on the tube wall, the grooves are connected to the tube cavity, and the top surface of the groove body is a corrugated surface extending along the axial direction of the tubular structure. Before release, the top surface of the corrugated groove body of the first locking part 4 and the top surface of the corrugated groove body of the second locking part 5 are mutually buckled, and the control cable 3 passes through the tube cavity of the slender tube 2, the tube cavity of the second locking part 5 and the tube cavity of the first locking part 4. When release is required, the control cable 3 is withdrawn to release the medical device implant 100, and then the slender tube 2 is withdrawn out of the body; another type of mechanical release of medical devices in the prior art In the post-release device for medical device implant, the control cable passes through a microcatheter or a slender tube as a delivery tube, and the locking assembly includes a first locking portion connected to the rear end of the medical device implant and a second locking portion connected to the front end of the control cable. Before release, the first locking portion and the second locking portion are both located inside the delivery tube and the first locking portion and the second locking portion are engaged with each other. As the control cable is pushed forward relative to the delivery tube, the first locking portion and the second locking portion can be slowly pushed out of the delivery tube, and then the first locking portion is separated from the second locking portion to release the medical device implant. The more detailed structure is as follows. Figure 2 As shown, the control cable 3 passes through the microcatheter 1 or the slender tube 2 serving as a delivery tube, and the first locking portion 4 and the second locking portion 5 are hook-shaped structures that interlock with each other, or the first locking portion 4 and the second locking portion 5 not shown in the figure are protrusion and groove structures that cooperate with each other, and the protrusion can be but is not limited to a spherical protrusion, etc.

[0050] The following is further explained in the order of the examples of the above-mentioned prior art as the first prior art structure and the second prior art structure: in the prior art, in the first prior art structure, the mutually buckled portion of the first locking portion 4 and the second locking portion 5 in the locking assembly is a simple mutual buckling between grooves, and the control cable 3 passes through the groove portion of the first locking portion 4 and the second locking portion 5, and the first locking portion 4 and the second locking portion 5 cannot be firmly limited. Once the first locking portion 4 and the second locking portion 5 are pushed out of the microcatheter 1, the first locking portion 4 and the second locking portion 5 become loose, affecting the selection and control of the implantation angle, and due to the dislocation caused by the loosening between the first locking portion 4 and the second locking portion 5, the medical device implant 100 cannot be withdrawn into the interior of the microcatheter 1; in the second prior art structure, it is even more impossible to withdraw the medical device implant 100 into the delivery tube after the first locking portion 4 is pushed forward.

[0051] In summary, the existing mechanically detachable medical device implant post-release device has at least one problem: once the medical device implant 100 is detached from the delivery tube, it cannot be withdrawn into the delivery tube, which may cause the problem of accidental embolism. After accidental embolism, another loop method or other methods can only be used to remove the erroneously released medical device implant 100 from the human body. The operation is complicated, not conducive to the rapid completion of the operation, and it is easy to increase the surgical trauma.

[0052] In contrast, this embodiment provides a post-implantation release device for a medical device, specifically referring to Figures 3 to 11 The post-release device for medical device implant includes a microcatheter 1, a slender tube 2, a control cable 3 and a locking assembly; the slender tube 2 passes through the microcatheter 1, the control cable 3 is installed in the slender tube 2 and the rear end of the control cable 3 is fixed to the slender tube 2, the locking assembly includes a first locking part 4 and a second locking part 5, the first locking part 4 is used to connect to the rear end of the medical device implant 100, and the second locking part 5 is connected to the front end of the slender tube 2. Wherein: a first center hole 400 axially penetrating the first locking part 4 is provided inside the first locking part 4, a first groove communicating with the first center hole 400 is provided on the radial circumferential surface of the rear end of the first locking part 4, and the top surface of the groove body of the first groove is formed as a first curved surface 401 extending along the axial direction of the first locking part 4; a second center hole axially penetrating the second locking part 5 is provided inside the second locking part 5, the second center hole is communicated with the tube cavity of the slender tube 2, a second groove communicating with the second center hole is provided on the radial circumferential surface of the front end of the second locking part 5, and the top surface of the groove body of the second groove is formed as a second curved surface 501 extending along the axial direction of the second locking part 5, and an anti-drop limiting part is connected to the front end of the second locking part 5; in the locked state, the first curved surface 401 and the second curved surface 501 are buckled with each other, the front end of the control cable 3 passes through the first center hole 400 and the second center hole, and the anti-drop limiting part cooperates with the control cable 3 to limit the front end of the second locking part 5 to the inside of the first groove.

[0053] In this embodiment, by providing the above-mentioned anti-drop limit portion, the space for the control cable 3 to swing up and down and left and right relative to the first groove and the second groove can be limited, thereby improving the locking stability of the control cable 3 to the first locking portion 4 and the second locking portion 5 in the locked state. At the same time, after the first locking portion 4 and the second locking portion 5 are extended out of the tube, the front end of the second locking portion is prevented from falling from the first groove of the first locking portion, causing the front end of the second locking portion to be misaligned with the first locking portion. Since the control cable 3 is installed in the slender tube 2 and the rear end of the control cable 3 is fixed to the slender tube 2, the medical device implant 100 can be withdrawn into the interior of the microcatheter 1 by withdrawing the slender tube 2. After the accurate release position is determined, the fixed relationship between the rear end of the control cable 3 and the slender tube 2 is released, and the control cable 3 is withdrawn to release the medical device implant 100, so as to achieve the purpose of avoiding accidental occlusion.

[0054] In summary, this embodiment at least alleviates the problem of the existing mechanically detachable medical device implant rear release device, that once the medical device implant is detached from the delivery tube, it can no longer be withdrawn into the delivery tube, which may cause mis-engagement. At the same time, it can enhance the locking stability of the first locking part 4 and the second locking part 5 in the mutually locked state.

[0055] In particular, in this embodiment, the control cable mentioned above can be a solid cable or a hollow cable, which is not specifically limited here.

[0056] In optional implementations of this embodiment, the post-implantation release device of the medical device has a variety of specific optional structures.

[0057] For example but not limited to, Figures 3 to 5 As shown, the anti-drop limit part includes a limit block 61 connected to the inside of the second groove, and a limit hole axially passing through the limit block 61 is opened on the limit block 61; in the locked state, the control cable 3 passes through the limit hole; preferably, the diameter of the front end of the control cable 3 is d1, and the aperture of the limit hole is d0, then d0-d1≤0.5mm.

[0058] For example, Figures 6 to 10 As shown, with the axis of the second locking part 5 as the longitudinal direction, the anti-drop limit part includes a limit rod 62 which is transversely connected to the wall surface of the second slot; in the locked state, the front end of the control cable 3 passes through the portion between the limit rod 62 and the bottom surface of the second slot. Preferably, a card interface 502 is provided on the top surface of the slot on both sides of the axial direction of the second slot, and the two ends of the limit rod 62 are correspondingly connected to the inside of the card interface 502 on the corresponding side. Compared with the prior art, the first locking part 4 and the second locking part 5 cannot rotate relative to each other after being locked with each other, so that the locking assembly is stiff, has low flexibility, is not convenient for doctors to adjust the angle, and is not conducive to releasing the implant at an ideal position. In the above structure of this optional embodiment, the first locking part 4 and the second locking part 5 can rotate with each other at a certain angle with the limit rod 62 as the axis, so that it is flexible to use and convenient for doctors to adjust the angle, so as to accurately release the implant at the lesion.

[0059] In addition, in order to further increase the restraining effect of the control cable 3 on the first locking part 4 and the second locking part 5 in the locked state, in some optional implementations of the present embodiment, it is more preferred that the first center hole 400 passes through the rear end face of the first groove; in some optional implementations of the present embodiment, it is more preferred that the diameter of the front end of the control cable 3 is d1, and the aperture of the first center hole 400 is d2, then d2-d1≤0.5mm.

[0060] In addition, in order to facilitate processing and manufacturing and to reduce production costs as much as possible, in the optional implementation of this embodiment, it is more preferred that the second locking portion 5 is integrally formed with the elongated tube 2; and / or, the first locking portion 4 includes a main body 41 and a connecting portion 42 that are integrally connected, the first central hole 400 passes through the main body 41 and the connecting portion 42, the first slot is provided in the main body 41, and the connecting portion 42 is used to be inserted and fixedly connected to the rear end of the medical device implant 100 by welding, bonding or other fixed connection methods. Among them, "and / or" means that in a specific implementation, the two structures before and after the above "and / or" are selected or provided at the same time.

[0061] In addition, the delivery tube of the post-implantation release device of the medical device in the prior art is relatively hard and has poor flexibility, which is not conducive to the delivery tube passing through tortuous blood vessels and is inconvenient for doctors to use. Figures 6 to 10 As shown, in an optional implementation of this embodiment, it is more preferred that at least one tube cutting groove 201 extending along the axial direction of the slender tube 2 is provided on the tube wall of the slender tube 2. The number of the tube cutting groove 201 can be one or multiple tube cutting grooves spaced from each other, which is not specifically limited here. The tube cutting groove 201 can reduce the volume of a part of the slender tube 2, making the slender tube 2 easier to bend, and increasing the overall flexibility of the slender tube 2. Such a slender tube 2 is easier to pass through tortuous blood vessels, thereby facilitating doctors to quickly deliver the medical device implant 100 to the lesion site and reduce damage to the blood vessel wall. Preferably, the tube cutting groove 201 includes a portion of the slender tube 2 close to the second locking portion 5, which is equivalent to thinning the front end of the slender tube 2, so that the slender tube 2 is easier to bend.

[0062] Of course, in other optional implementations of this embodiment, other methods may be used to increase the flexibility of the slender tube 2, such as but not limited to reducing the diameter of the slender tube 2 and using more flexible materials to manufacture the slender tube 2.

[0063] In addition, in order to more conveniently withdraw the control cable 3 during the release process, in an optional implementation manner of this embodiment, as shown in FIG. Figure 3 , Figure 6 and Figure 7 As shown, a breaking portion 202 for breaking the slender tube 2 is provided at the rear end of the slender tube 2. When the medical device implant 100 needs to be released, the slender tube 2 is broken along the breaking portion 202, and then the control cable 3 is withdrawn. The breaking portion 202 includes but is not limited to one or more groove structures provided at the rear end of the slender tube 2, or a small section at the rear end of the slender tube 2 with a smaller diameter than other parts or other breakable structures.

[0064] Preferably, a control cable fixing groove 203 connected to the tube cavity of the slender tube 2 is opened on the tube wall at the rear end of the slender tube 2, and the rear end of the control cable 3 is fixedly connected to the inner wall of the control cable fixing groove 203; the breaking portion 202 is arranged at the rear end of the slender tube 2 and is located at the front end of the control cable fixing groove 203, so that when withdrawing the control cable 3, it is only necessary to pull backwards the rear end of the broken slender tube 2, which has the beneficial effect of convenient operation.

[0065] Finally, it should be noted that: 1. The slot structure in this specification can be, but is not limited to, slots formed by laser cutting or other processes;

[0066] 2. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A post-implantation release device for a medical device, characterized in that: The invention comprises a microcatheter (1), a slender tube (2), a control cable (3) and a locking assembly; the slender tube (2) passes through the microcatheter (1), the control cable (3) is inserted into the slender tube (2) and the rear end of the control cable (3) is fixed to the slender tube (2); the locking assembly comprises a first locking portion (4) and a second locking portion (5); the first locking portion (4) is used to be connected to the rear end of a medical device implant (100), and the second locking portion (5) is connected to the front end of the slender tube (2); A first center hole (400) is provided inside the first locking portion (4) and axially penetrates the first locking portion (4); a first slot communicating with the first center hole (400) is provided on a radial circumferential surface at the rear end of the first locking portion (4); a top surface of the first slot is formed as a first curved surface (401) extending along the axial direction of the first locking portion (4); A second center hole axially penetrating the second locking portion (5) is provided inside the second locking portion (5), the second center hole being in communication with the lumen of the elongated tube (2), a second groove in communication with the second center hole being provided on the radial circumferential surface at the front end of the second locking portion (5), the top surface of the second groove being formed as a second curved surface (501) extending axially along the second locking portion (5), and an anti-dropping limiting portion being connected to the front end of the second locking portion (5); In the locked state, the first curved surface (401) and the second curved surface (501) are mutually buckled, the front end of the control cable (3) passes through the first center hole (400) and the second center hole, and the anti-drop limit portion cooperates with the control cable (3) to limit the front end of the second locking portion (5) to the inside of the first slot; With the axis of the second locking portion (5) as the longitudinal direction, the anti-drop limit portion comprises a limit rod (62) which is laterally connected to the wall surface of the groove body of the second groove; a card interface (502) is provided on the top surface of the groove body on both axial sides of the second groove, and the two ends of the limit rod (62) are correspondingly carded to the inside of the card interface (502) on the corresponding side; in the locked state, the front end of the control cable (3) passes through the area between the limit rod (62) and the bottom surface of the groove body of the second groove; the first locking portion (4) and the second locking portion (5) can rotate relative to each other at a certain angle with the limit rod (62) as the axis, so that the doctor can adjust the angle and accurately release the implant at the lesion; The diameter of the front end of the control cable (3) is d1, and the diameter of the first central hole (400) is d2, then d2-d1≤0.5 mm.

2. The post-implantation release device for medical devices according to claim 1, characterized in that: The first center hole (400) passes through the rear end surface of the first slot.

3. The post-implantation release device for medical devices according to claim 1, characterized in that: The second locking portion (5) is integrally formed with the elongated tube (2); And / or, the first locking portion (4) comprises a main body (41) and a connecting portion (42) which are integrally connected, the first center hole (400) passes through the main body (41) and the connecting portion (42), the first groove is provided in the main body (41), and the connecting portion (42) is used to be inserted into and fixedly connected to the rear end of the medical device implant (100).

4. The post-implantation release device for medical devices according to claim 1, characterized in that: At least one tube cutting groove (201) extending along the axial direction of the slender tube (2) is provided on the tube wall of the slender tube (2).

5. The post-implantation release device for medical devices according to claim 1, characterized in that: A breaking portion (202) for breaking the slender tube (2) is provided at the rear end of the slender tube (2).

6. The post-implantation release device for medical devices according to claim 5, characterized in that: A control cable fixing groove (203) communicating with the tube cavity of the slender tube (2) is provided on the tube wall at the rear end of the slender tube (2); the rear end of the control cable (3) is fixedly connected to the inner wall of the control cable fixing groove (203); and the breaking portion (202) is arranged at the rear end of the slender tube (2) and is located at the front end of the control cable fixing groove (203).

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