Post-deployment device for covered stent and covered stent implantation system

Abstract

The present invention provides a post-release device for a covered stent and a covered stent implantation system, which relates to the technical field of medical devices and includes a guiding seat, a wire pulling seat, a locking structure, a first wire made of a flexible material, and a plurality of second wires; the first wire is wound around the outer or inner circumferential surface of the guiding seat, and one end of the first wire is fixedly connected to the wire pulling seat, and the locking structure fixes the other end of the first wire to the guiding seat; one end of each of the plurality of second wires is fixedly connected to the guiding seat, and the free ends are all fixed between the first wire and the guiding seat; when the wire pulling seat moves away from the guiding seat, the first wire can be disengaged from the guiding seat, so as to release the free ends of the plurality of second wires. The present invention alleviates the technical problems that the existing post-release device for a covered stent is extremely easy to scratch blood vessels, causing blood vessel injury or even rupture, and when the proximal end of the covered stent is released, the proximal part of the covered stent is released and bounced out simultaneously everywhere, which will cause great damage to blood vessels, thereby resulting in high surgical difficulty and low surgical success rate.

Description

Technical Field

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

[0002] Aortic diseases include aortic dissection, aortic aneurysm, etc., which are mainly caused by hypertension, arteriosclerosis, injury, infection, etc. They are cardiovascular diseases that seriously threaten human health, and patients face a great threat to life. The traditional surgical method for treating aortic diseases is to introduce extracorporeal circulation and perform an open surgery to replace the damaged part with an artificial blood vessel. However, the open surgery takes a long time, has a large surgical trauma, and has a very high mortality rate. In recent years, a minimally invasive interventional method has become popular for treating patients, that is, a covered stent is released to the diseased blood vessel position of the patient through a specific delivery system to repair the blood vessels of aortic dissection and aortic aneurysm, protect the diseased blood vessels, and avoid the death caused by the rupture of the diseased blood vessels.

[0003] The covered stent is generally cylindrical, composed of a metal skeleton and a thin artificial blood vessel covering. The metal skeleton is mostly made of shape memory alloy, and the material of the thin artificial blood vessel is mostly made of polyester or polytetrafluoroethylene. Before the operation, the covered stent needs to be loaded into the outer tube of the delivery system. The delivery system transports the loaded covered stent to the diseased blood vessel position of the patient and releases it to achieve the treatment purpose. Usually, the delivery system for transporting the covered stent to the diseased blood vessel position of the patient includes a delivery device and a guiding wire. The delivery device includes an operating handle, an outer tube, an inner tube, a wire tube, and a post-deployment device for the covered stent. The wire tube passes through the inner tube, the inner tube passes through the outer tube, both the outer tube and the inner tube are connected to the operating handle, and the post-deployment device for the covered stent is connected to the proximal end of the inner tube. When delivering the covered stent to the human body, in the first step, the covered stent is installed inside the proximal end of the delivery device. Specifically, the whole covered stent is compressed inside the outer tube, and the rear fixator fixes the rear end of the covered stent from the inside of the outer tube, fixes the proximal end of the covered stent to the post-deployment device for the covered stent, and the post-deployment device for the covered stent restrains the proximal end of the covered stent so that the proximal end of the covered stent is in a retracted state. In the second step, the guiding wire is passed through the wire tube, and the delivery device loaded with the covered stent is transported to the diseased blood vessel position of the patient through percutaneous puncture along the guiding wire. In the third step, the outer tube is retracted using the operating handle so that the distal end of the covered stent is released from the outer tube, and the covered stent is semi-released. In the fourth step, the inner tube is retracted using the operating handle so that the post-deployment device for the covered stent releases the proximal end of the covered stent, thereby completely releasing the covered stent. In the fifth step, the outer tube is reset using the operating handle. In the sixth step, the whole delivery device and the guiding wire are withdrawn backward.

[0004] In the prior art, the structure of the stent graft proximal end restrained by the stent graft rear release device is mostly a hard metal wire or a rigid metal fork structure. When the stent graft is fully released, the edges and corners of the rigid structure of the stent graft proximal end restrained by the stent graft rear release device can easily scratch and damage the blood vessels in narrow and curved blood vessel channels, causing blood vessel damage or even rupture, which may cause fatal injuries to the patient if not handled with care. In addition, in the prior art, when the proximal end of the stent graft is released by the stent graft rear release device, various parts of the proximal end of the stent graft are released and bounced outward at the same time. This release process can also cause greater damage to the blood vessels, thereby leading to high surgical difficulty and low surgical success rate. Summary of the invention

[0005] The purpose of the present invention is to provide a coated stent post-release device and a coated stent implantation system to alleviate the problem that the coated stent post-release device in the prior art is very likely to scratch the blood vessels in narrow and curved blood vessel channels, causing blood vessel damage or even rupture, which will cause fatal injuries to the patient if not handled with care. When the proximal end of the coated stent is released by the existing coated stent post-release device, all parts of the proximal end of the coated stent are released and bounced outward at the same time. This release process will also cause significant damage to the blood vessels, thereby leading to technical problems such as high surgical difficulty and low surgical success rate.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a stent graft rear release device, comprising a guide seat, a wire puller seat, a first wire puller, a second wire puller and a locking structure;

[0008] The first pull wire and the second pull wire are both made of flexible material;

[0009] The direction extending from the proximal end of the guide seat toward the distal end of the guide seat is taken as the axial direction of the guide seat, and the direction extending from the proximal end of the wire pulling seat toward the distal end of the wire pulling seat is taken as the axial direction of the wire pulling seat. A first mounting through hole penetrating the guide seat along the axial direction of the guide seat is provided on the guide seat, and a second mounting through hole penetrating the wire pulling seat along the axial direction of the wire pulling seat is provided on the wire pulling seat;

[0010] The first pull wire is coiled around the outer circumference of the guide seat or the inner circumference of the guide seat, and one end of the first pull wire is fixedly connected to the pull wire seat, and the locking structure fixes the other end of the first pull wire to the guide seat;

[0011] The second guy wires are multiple, and one ends of the multiple second guy wires are fixedly connected to the guide seat, and the multiple second guy wires are distributed at intervals in pairs around the radial circumferential surface of the guide seat. Taking the other ends of the second guy wires as the free ends of the second guy wires, the free ends of the multiple second guy wires are all fixed between the first guy wire and the guide seat; and when the guy wire seat moves away from the guide seat, the first guy wire can be separated from the guide seat, so as to release the free ends of the multiple second guy wires.

[0012] Combined with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the locking structure includes a spiral groove provided on the outer circumferential surface or the inner circumferential surface of the guide seat, and the notch of the spiral groove is configured to be able to squeeze and fix the first guy wire provided inside the spiral groove inside the spiral groove, so as to squeeze and fix the free end of the second guy wire between the groove wall of the spiral groove and the first guy wire.

[0013] Combined with the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the locking structure further includes an elastic tube, the elastic tube is fixed inside the spiral groove, and the first guy wire is squeezed and fixed inside the elastic tube; or, the elastic tube is squeezed and fixed inside the spiral groove, and the first guy wire is fixed inside the elastic tube.

[0014] Combined with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the elastic tube includes multiple segments that are spaced apart from each other in pairs.

[0015] Combined with one of the first to third possible implementation manners of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the depth of the spiral groove is greater than the thickness of the first guy wire in a direction perpendicular to the length of the first guy wire itself.

[0016] Combined with one of the second or third possible implementation manners of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the depth of the spiral groove is greater than the diameter of the elastic tube.

[0017] Combined with one of the first to third possible implementation manners of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein a first guy wire through hole is further provided on the guide seat, one end of the first guy wire through hole communicates with the distal end face of the guide seat, and the other end of the first guy wire through hole communicates with a portion of the spiral groove close to the distal end of the guide seat.

[0018] Combined with the first aspect and one of its first to third possible embodiments, an embodiment of the present invention provides a seventh possible embodiment of the first aspect, wherein the locking structure includes an elastic lock ring configured to: be able to squeeze and fix one end of the first wire rope away from the wire rope seat on the outer peripheral surface of the guide seat, or squeeze and fix one end of the first wire rope away from the wire rope seat on the inner peripheral surface of the guide seat.

[0019] Combined with the seventh possible embodiment of the first aspect, an embodiment of the present invention provides an eighth possible embodiment of the first aspect, wherein on the inner peripheral surface or the outer peripheral surface of the guide seat, there is further provided a lock ring fixing groove extending along the radial circumferential direction of the guide seat.

[0020] Combined with the eighth possible embodiment of the first aspect, an embodiment of the present invention provides a ninth possible embodiment of the first aspect, wherein the depth of the lock ring fixing groove is greater than the thickness of the ring body of the elastic lock ring.

[0021] Combined with the first aspect, an embodiment of the present invention provides a tenth possible embodiment of the first aspect, wherein the locking structure includes a first wire rope fixing groove provided on the outer peripheral surface or the inner peripheral surface of the guide seat;

[0022] The first wire rope fixing groove includes a first fixing groove and a second fixing groove; one end of the first fixing groove is connected to one end of the second fixing groove, and the depth of the second fixing groove is greater than the depth of the first fixing groove;

[0023] The first wire rope passes through the first fixing groove; an elastic limiting head is provided at the end of one end of the first wire rope away from the wire rope seat, and the elastic limiting head is configured to be compressible to a maximum thickness of the elastic limiting head less than the depth of the first fixing groove, and in the case where the elastic limiting head is not compressed, the maximum thickness of the elastic limiting head is greater than the depth of the first fixing groove;

[0024] The notch of the second fixing groove is configured to limit the elastic limiting head in the second fixing groove.

[0025] Combined with the first aspect and one of its first to third and tenth possible embodiments, an embodiment of the present invention provides an eleventh possible embodiment of the first aspect, wherein a ferrule is provided at the free end of each of the second wire ropes, and the first wire rope sequentially passes through the ferrules on the free ends of multiple second wire ropes.

[0026] Combined with one of the first aspect and its first to third and tenth possible embodiments, an embodiment of the present invention provides a twelfth possible embodiment of the first aspect, wherein a fixing ring is provided on the wire drawing seat, and one end of the first wire is fixedly connected to the wire drawing seat in a manner of passing through the fixing ring and then tying a knot.

[0027] Combined with one of the first aspect and its first to third and tenth possible embodiments, an embodiment of the present invention provides a thirteenth possible embodiment of the first aspect, wherein a plurality of bosses are provided on the outer peripheral surface of the guiding seat, and the plurality of bosses are configured to be able to hook the hanging ring at the proximal end of the covered stent on the guiding seat.

[0028] Combined with one of the thirteenth possible embodiments of the first aspect, an embodiment of the present invention provides a fourteenth possible embodiment of the first aspect, wherein a boss through hole is formed in each of the bosses, and the opposite end of the free end of the second wire is fixedly connected to the boss through hole.

[0029] Combined with one of the first aspect and its first to third and tenth possible embodiments, an embodiment of the present invention provides a fifteenth possible embodiment of the first aspect, wherein a plurality of second wire limiting grooves are formed on the outer peripheral surface or the inner peripheral surface of the guiding seat, the plurality of second wire limiting grooves correspond to the plurality of second wires one by one, and one end of each of the plurality of second wire limiting grooves extends to the distal end face of the guiding seat.

[0030] Combined with the fifteenth possible embodiment of the first aspect, an embodiment of the present invention provides a sixteenth possible embodiment of the first aspect, wherein the depth of the second wire limiting groove is greater than the thickness of the second wire in a direction perpendicular to the extension direction of the second wire itself.

[0031] Combined with one of the first aspect and its first to third and tenth possible embodiments, an embodiment of the present invention provides a seventeenth possible embodiment of the first aspect, wherein the outer peripheral surface of the proximal end of the guiding seat is a frustum side surface with a diameter gradually increasing from the proximal end of the guiding seat towards the distal end of the guiding seat.

[0032] Combined with one of the first aspect and its first to third and tenth possible embodiments, an embodiment of the present invention provides an eighteenth possible embodiment of the first aspect, wherein an X-ray imaging agent is connected to the first wire and / or the second wire.

[0033] In a second aspect, an embodiment of the present invention provides a covered stent implantation system, including an operating handle, a guide wire tube, an inner tube, an outer tube, and the post-release device for the covered stent provided by the first aspect and any one of its possible embodiments; wherein: the guide wire tube passes through the inner tube, and the guide wire tube passes through the second installation through hole, and the proximal end of the guide wire tube is fixed inside the first installation through hole; the proximal end of the inner tube is fixed to the distal end of the wire pulling seat; the distal ends of the outer tube and the inner tube are both connected to the operating handle, and the operating handle is configured to be able to drive the outer tube and the inner tube to move forward and backward.

[0034] The embodiments of the present invention can achieve the following beneficial effects:

[0035] In a first aspect, an embodiment of the present invention provides a post-release device for a covered stent, including a guiding seat, a wire pulling seat, a first wire, a second wire, and a locking structure.

[0036] Wherein: both the first wire and the second wire are made of flexible materials; taking the direction from the proximal end to the distal end of the guiding seat as the axial direction of the guiding seat, and taking the direction from the proximal end to the distal end of the wire pulling seat as the axial direction of the wire pulling seat, a first installation through hole penetrating the guiding seat along the axial direction of the guiding seat is provided on the guiding seat, and a second installation through hole penetrating the wire pulling seat along the axial direction of the wire pulling seat is provided on the wire pulling seat; the first wire is wound around the outer peripheral surface or the inner peripheral surface of the guiding seat, and one end of the first wire is fixedly connected to the wire pulling seat, and the locking structure fixes the other end of the first wire to the guiding seat; there are multiple second wires, one ends of the multiple second wires are all fixedly connected to the guiding seat, and the multiple second wires are distributed at intervals of two around the radial circumferential surface of the guiding seat. Taking the other end of the second wire as the free end of the second wire, the free ends of the multiple second wires are all fixed between the first wire and the guiding seat; and when the wire pulling seat moves away from the guiding seat, the first wire can be separated from the guiding seat, so as to release the free ends of the multiple second wires.

[0037] In the fixing and releasing device for the covered stent provided by the embodiment of the present invention, first, by using the first pull wire and the second pull wire made of flexible materials, no sharp edges are generated during bending, which can ensure the flexibility of the structure for binding the proximal end of the covered stent in the fixing and releasing device for the covered stent. During the operation, the scratching damage to the blood vessel can be greatly reduced. On this basis, pay attention to the operation matters, for example, but not limited to, making the second pull wire passing through the hanging ring position at the proximal end of the covered stent longer, so that when the outer tube is withdrawn to semi-release the covered stent, the constrained deformation of the covered stent is smaller; thus, when the covered stent is completely released, the force for releasing the covered stent is not so large, and the buffering effect can be achieved, further protecting the blood vessel and even not causing scratching to the blood vessel. Therefore, the damage to the blood vessel during the operation process is greatly reduced; second, in the prior art, before the whole delivery device and the guiding wire are withdrawn backward, it is necessary to first reset the outer tube by using the operation handle of the delivery device to avoid the sharp edges of the rigid structure at the front end for binding the covered stent from continuously damaging the blood vessel during withdrawal. This operation consumes a certain amount of operation time. In contrast, this embodiment does not require this step of operation and the whole delivery device can be directly withdrawn, thereby reducing the operation steps of the doctor and improving the operation efficiency; in addition, the overall structure of the fixing and releasing device for the covered stent provided by this embodiment is simple and convenient for installation and adjustment, thereby improving the preparation and debugging efficiency of the surgical instruments before the operation. In addition, in this embodiment, when the covered stent is completely released, the covered stent is gradually and slowly released by pulling the first pull wire backward, and the first pull wire is wound around the outer peripheral surface or the inner peripheral surface of the guiding seat. That is to say, during this release process, each hanging ring on the covered stent is relatively independent, and the adjacent two hanging rings are released sequentially and slowly, and the impact on the blood vessel for each release is very small, and the whole release process will be safer.

[0038] In summary, the embodiment of the present invention at least alleviates the technical problems in the prior art that the structures for binding the proximal end of the covered stent in the fixing and releasing device for the covered stent are mostly hard metal wires or rigid metal fork-like structures, which are extremely easy to scratch the blood vessel in the narrow and curved blood vessel channel, causing blood vessel injury or even rupture, and with a little carelessness, it will cause fatal injury to the patient. And when the proximal end of the covered stent is released by the existing post-release device for the covered stent, all parts of the proximal end of the covered stent are released and bounced outward at the same time, and this release process will also cause greater damage to the blood vessel, thereby resulting in high operation difficulty and low operation success rate; at the same time, the operation efficiency is improved, and the preparation and debugging efficiency of the surgical instruments before the operation is improved.

[0039] In a second aspect, an embodiment of the present invention provides a covered stent implantation system, including an operating handle, a guide wire tube, an inner tube, an outer tube, and the covered stent post-release device provided in the first aspect; wherein: the guide wire tube passes through the inner tube and passes through the second mounting through-hole, and the proximal end of the guide wire tube is fixed inside the first mounting through-hole; the proximal end of the inner tube is fixed to the distal end of the wire pulling seat; the distal ends of the outer tube and the inner tube are both connected to the operating handle, and the operating handle is configured to be able to drive the outer tube and the inner tube to move forward and backward; since the covered stent implantation system provided in the embodiment of the present invention includes the covered stent post-release device provided in the first aspect, therefore, the covered stent implantation system provided in the embodiment of the present invention can achieve all the beneficial effects that the covered stent post-release device provided in the first aspect can achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic diagram of the overall structure of the covered stent post-release device provided in the embodiment of the present invention;

[0042] Figure 2 is Figure 1 a partial enlarged view of part A in;

[0043] Figure 3 It is an exploded view of the overall structure of the covered stent post-release device provided in the embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the overall structure of the fixed seat in the guide seat in the embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of the overall structure of the fixed seat in the guide seat from another perspective in the embodiment of the present invention;

[0046] Figure 6 It is a schematic diagram of the assembly structure of the first wire, the second wire, and the fixed seat of the guide seat in the embodiment of the present invention;

[0047] Figure 7 It is a schematic diagram of the assembly structure of the first wire, the second wire, and the fixed seat of the guide seat from another perspective in the embodiment of the present invention;

[0048] Figure 8 is Figure 7 a cross-sectional view taken along the line B-B of;

[0049] Figure 9 It is a schematic diagram of the overall structure of the wire pulling seat in the embodiment of the present invention;

[0050] Figure 10 It is an assembly drawing of the post-release device of the covered stent, the inner tube, the rear fixator and the guide wire tube in the covered stent implantation system provided by the embodiment of the present invention;

[0051] Figure 11 It is an exploded assembly drawing of the post-release device of the covered stent, the inner tube, the outer tube, the rear fixator and the guide wire tube in the covered stent implantation system provided by the embodiment of the present invention;

[0052] Figure 12 It is a schematic diagram of the overall structure of the fixed seat of the guide seat in the second alternative embodiment of the locking structure in the embodiment of the present invention;

[0053] Figure 13 It is a schematic diagram of the overall structure of the fixed seat of the guide seat in the third alternative embodiment of the locking structure in the embodiment of the present invention.

[0054] Icons: 100 - guide seat; 111 - fixed seat; 112 - guide head; 101 - first installation through hole; 110 - first wire pulling through hole; 120 - lock ring fixing groove; 130 - boss; 1301 - boss through hole; 140 - second wire pulling limiting groove; 150 - connection hole; 200 - wire pulling seat; 201 - second installation through hole; 210 - fixing ring; 300 - first wire; 310 - elastic limiting head; 400 - second wire; 410 - ferrule; 510 - spiral groove; 520 - elastic tube; 530 - elastic lock ring; 540 - first wire fixing groove; 541 - first fixing groove; 542 - second fixing groove; 600 - covered stent; 710 - guide wire tube; 7100 - connection part; 720 - inner tube; 730 - outer tube; 740 - rear fixator. Detailed implementation manners

[0055] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0059] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0060] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected" 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 directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0062] Embodiment 1

[0063] This embodiment provides a post-release device for a covered stent. Referring to Figures 1 to 3 , the post-release device for the covered stent includes a guide seat 100, a wire seat 200, a first wire 300, a second wire 400, and a locking structure.

[0064] Wherein: both the first cable 300 and the second cable 400 are made of flexible materials; taking the direction from the proximal end of the self-guiding seat 100 towards the distal end of the guiding seat 100 as the axial direction of the guiding seat 100, and taking the direction from the proximal end of the cable seat 200 towards the distal end of the cable seat 200 as the axial direction of the cable seat 200, a first mounting through-hole 101 penetrating the guiding seat 100 along the axial direction of the guiding seat 100 is provided on the guiding seat 100, and a second mounting through-hole 201 penetrating the cable seat 200 along the axial direction of the cable seat 200 is provided on the cable seat 200.

[0065] The first cable 300 is coiled around the outer peripheral surface or the inner peripheral surface of the guiding seat 100, and one end of the first cable 300 is fixedly connected to the cable seat 200, and the locking structure fixes the other end of the first cable 300 to the guiding seat 100; there are multiple second cables 400, one ends of the multiple second cables 400 are all fixedly connected to the guiding seat 100, and the multiple second cables 400 are distributed at intervals of two along the radial circumferential surface of the guiding seat 100, taking the other end of the second cable 400 as the free end of the second cable 400, and the free ends of the multiple second cables 400 are all fixed between the first cable 300 and the guiding seat 100; and when the cable seat 200 moves away from the guiding seat 100, the first cable 300 can be separated from the guiding seat 100, so as to release the free ends of the multiple second cables 400.

[0066] In this embodiment, the proximal end refers to the end close to the patient's blood vessel when the medical device works, and the distal end refers to the end close to the doctor. Wherein: the flexible materials for making the first cable 300 and the second cable 400 can be but are not limited to high molecular materials such as PA (polyamide, commonly known as nylon), PP (Polypropylene), PET (Polyethyleneterephthalate, commonly known as polyester resin), etc., or wire materials such as soft stainless steel, cobalt-chromium alloy, titanium alloy, etc. Preferably, the flexible material used is a material with no elasticity or less elasticity to avoid the tensile deformation of the first cable 300 and the second cable 400; as Figure 3 shown, the guiding seat 100 includes a fixed seat 111 and a guiding head 112, the distal end of the guiding head 112 is connected to the proximal end of the fixed seat 111, and the fixed seat 111 is used to cooperate with the locking structure and the cable seat 200 to fix the first cable 300 and the second cable 400; the guiding head 112 and the fixed seat 111 can be an integrally formed structure, or as Figure 5As shown, a connection hole 150 is formed on the proximal end face of the fixed seat 111. At the same time, such a connection hole is also formed on the distal end face of the guide head 112. The guide head 112 is connected to the fixed seat 111 by connecting a plug rod in the connection hole on the guide head 112 or in the connection hole 150 on the fixed seat 111. The plug rod can be fixed in the connection holes on the guide head 112 and the fixed seat 111 by interference fit or other connection methods.

[0067] During use, in the first step, the covered stent as a whole is installed in the covered stent implantation system. Specifically, referring to Figure 10 and Figure 11 , the covered stent 600 is compressed in the outer tube 730 of the delivery device. The rear retainer 740 fixes the rear end of the covered stent 600 from the inside of the outer tube 730. The inner tube 720 is threadedly connected or welded or interference-fitted or fixed in other ways to the distal end of the wire seat 200. The proximal end of the inner tube 720 can extend into the second installation through hole 201 on the wire seat 200. The proximal end of the guide wire tube 710 is fixedly connected to the first installation through hole 101 on the guide seat 100. There are various fixing methods, such as but not limited to Figure 11As shown, a connection part 7100 is provided at the proximal end of the guide wire tube 710. The connection part 7100 is welded inside the first mounting through hole 101, etc., or connection threads are provided on the hole wall of the first mounting through hole 101, and the proximal end of the guide wire tube 710 is threadedly connected inside the first mounting through hole 101, etc.; the opposite end of the second pulling wire 400 fixed to the guide seat 100, that is, the free end of the second pulling wire 400, passes through the hanging ring provided at the proximal end of the covered stent 600, and then the free end of the second pulling wire 400 is fixed between the first pulling wire 300 and the guide seat 100 by fixing the end of the first pulling wire 300 away from the pulling wire seat 200 to the guide seat 100 by using a locking structure. At this time, the covered stent fixing and releasing device restrains the proximal end of the covered stent so that the proximal end of the covered stent is in a retracted state; in the second step, the guiding guide wire is passed through the guide wire tube 710, and the covered stent fixing and releasing device loaded with the covered stent 600 is delivered to the patient's vascular lesion position through percutaneous puncture along the guiding guide wire by using a transporter; in the third step, the outer tube 730 is retracted by using the operating handle of the transporter so that the distal end of the covered stent 600 is released from the outer tube 730 to semi-release the covered stent 600; in the fourth step, the inner tube 720 is retracted by using the operating handle of the transporter, the inner tube 720 drives the pulling wire seat 200 to retract, pulls the first pulling wire 300, and the free end of the first pulling wire 300 disengages from the locking structure to disengage from the guide seat 100, thereby releasing the free ends of multiple second pulling wires 400, and further releasing the proximal end of the covered stent 600, so that the covered stent 600 is completely released; in the fifth step, the entire transporter and the guiding guide wire are withdrawn backward. Among them, the hanging ring provided on the stent at the proximal end of the covered stent 600 can be directly bent from the metal skeleton of the covered stent 600, or a hanging ring can be provided separately and connected to the proximal end of the metal skeleton of the covered stent 600.

[0068] In the covered stent fixing and releasing device provided in this embodiment, first, by using the first pulling wire 300 and the second pulling wire 400 made of flexible materials, no sharp edges are generated during bending, which can ensure the flexibility of the structure for binding the proximal end of the covered stent 600 by the covered stent fixing and releasing device. During the operation, the scratching damage to the blood vessel can be greatly reduced. On this basis, pay attention to the operation matters, such as but not limited to, making the second pulling wire 400 passing through the hanging ring position at the proximal end of the covered stent 600 longer, so that when the outer tube 730 is withdrawn to semi-release the covered stent 600, the constrained deformation of the covered stent 600 is smaller; thus, when the covered stent 600 is fully released, the force for releasing the covered stent 600 is not so large, and the buffering effect can be achieved, further protecting the blood vessel and even not causing scratching to the blood vessel. Therefore, the damage to the blood vessel during the operation is greatly reduced; second, in the prior art, before withdrawing the whole delivery device and the guiding wire backward, it is necessary to first reset the outer tube 730 by using the operating handle of the delivery device to avoid the sharp edges of its rigid structure for binding the front end of the covered stent 600 from continuously damaging the blood vessel during withdrawal. This operation consumes a certain amount of operation time. In contrast, this embodiment does not require this step of operation and can directly withdraw the whole delivery device, thus reducing the operation steps of the doctor and improving the operation efficiency; in addition, the overall structure of the covered stent fixing and releasing device provided in this embodiment is simple and convenient for installation and adjustment, thereby improving the preparation and debugging efficiency of the surgical instruments before the operation. In addition, in this embodiment, when the covered stent 600 is fully released, the covered stent 600 is gradually and slowly released by pulling the first pulling wire 300 backward, and the first pulling wire 300 is wound around the outer peripheral surface or the inner peripheral surface of the guiding seat 100. That is to say, during this release process, each hanging ring on the covered stent 600 is relatively independent, and the adjacent two hanging rings are released sequentially and slowly, and the impact on the blood vessel during each release is very small, and the whole release process will be safer.

[0069] In summary, this embodiment at least alleviates the technical problems in the prior art that the structures for binding the proximal end of the covered stent in the covered stent fixing and releasing device are mostly hard metal wires or rigid metal fork-like structures, which are extremely easy to scratch the blood vessel in the narrow and curved blood vessel channels, causing blood vessel injury or even rupture, and if not careful, it will cause fatal injury to the patient. And when the proximal end of the covered stent is released by the existing covered stent post-release device, the proximal part of the covered stent is released and bounced outward simultaneously everywhere, and this release process will also cause greater damage to the blood vessel, resulting in high operation difficulty and low operation success rate; at the same time, the operation efficiency is improved, and the preparation and debugging efficiency of the surgical instruments before the operation is improved.

[0070] In this embodiment, there are various specific structural forms of the above locking structure, such as but not limited to:

[0071] In the first alternative embodiment of the locking structure of the present embodiment, referring to Figures 1 to 9 , the locking structure includes a spiral groove 510 provided on the outer peripheral surface or the inner peripheral surface of the guide seat 100. The notch of the spiral groove 510 is configured to be able to squeeze and fix the first wire 300 provided inside the spiral groove 510 inside the spiral groove 510, so as to squeeze and fix the free end of the second wire 400 between the groove wall of the spiral groove 510 and the first wire 300. Specifically, the thickness of the first wire 300 in the direction perpendicular to its own length can be made slightly greater than the depth of the spiral groove 510. The notch of the spiral groove 510 is a narrow slit structure. When the first wire 300 is inserted into the spiral groove 510, the notch of the spiral groove 510 squeezes and fixes the first wire 300 inside the spiral groove 510. There is a large frictional force between the first wire 300 and the spiral groove 510. It is necessary to pull the wire seat 200 distally to apply a large pulling force to the first wire 300 to overcome the frictional force to pull the first wire 300 out of the spiral groove 510. Thus, the end of the first wire 300 away from the wire seat 200 is separated from the guide seat 100, and further, the purpose of releasing the free ends of multiple second wires 400 is achieved.

[0072] Continuing to refer to Figures 1 to 9 , in this alternative embodiment, preferably, the above locking structure further includes an elastic tube 520. The elastic tube 520 is fixed inside the spiral groove 510, and the first wire 300 is squeezed and fixed inside the elastic tube 520; or, the elastic tube 520 is squeezed and fixed inside the spiral groove 510, and the first wire 300 is fixed inside the elastic tube 520. Among them, the elastic tube 520 can be made of, but not limited to, a silicone material. Thus, the elastic force of the elastic tube 520 can be used to increase the frictional force between the first wire 300 and the spiral groove 510, and further ensure the implantation stability of the covered stent, and avoid the covered stent from loosening prematurely before reaching the implantation position. Further preferably, the above elastic tube 520 includes multiple segments spaced apart from each other in pairs. Thus, when the first wire 300 is installed in the spiral groove 510, the length and position of the first wire 300 can be bent and adjusted arbitrarily, and the operation is more flexible. Among them, preferably, the depth of the spiral groove 510 is greater than the diameter of the elastic tube 520. Thus, the spiral groove 510 can accommodate the elastic tube 520 and play a limiting role on the elastic tube 520, avoiding the elastic tube 520 from protruding from the spiral groove 510 and scratching the blood vessel wall, and further improving the surgical safety.

[0073] In addition, in this alternative embodiment, preferably, the depth of the spiral groove 510 is greater than the thickness of the first cable 300 in the direction perpendicular to the length of the first cable 300 itself. Thus, the spiral groove 510 can accommodate the first cable 300 and play a limiting role on the first cable 300, preventing the first cable 300 from protruding out of the spiral groove 510 and scratching the blood vessel wall, thereby further improving the surgical safety.

[0074] In addition, in this alternative embodiment, preferably, a first cable threading hole 110 is further provided on the guiding seat 100. One end of the first cable threading hole 110 communicates with the distal end face of the guiding seat 100, and the other end of the first cable threading hole 110 communicates with the part of the spiral groove close to the distal end of the guiding seat. The first cable threading hole 110 serves as a threading channel for the part between the end of the first cable 300 connected to the cable seat 200 and the part of the first cable 300 located in the spiral groove 510, preventing this part of the first cable 300 from being exposed outside the guiding seat 100 and scratching the blood vessel, which is also beneficial to improving the surgical safety.

[0075] In the second alternative embodiment of the locking structure of this embodiment, refer to Figure 12 , the locking structure includes an elastic locking ring 530, and the elastic locking ring 530 is configured to: be able to squeeze and fix one end of the first cable 300 away from the cable seat 200 on the outer peripheral surface of the guiding seat 100, or squeeze and fix one end of the first cable 300 away from the cable seat 200 on the inner peripheral surface of the guiding seat 100. In this alternative embodiment, the specific principle of squeezing and fixing the first cable 300 by the locking structure depends on the elastic performance of the elastic locking ring 530. The elastic locking ring 530 applies a large pressure to the first cable 300, so that there is a large frictional force between the first cable 300 and the guiding seat 100, and between the first cable 300 and the elastic locking ring 530. A large pulling force needs to be applied to the first cable 300 to overcome the frictional force to pull out the first cable 300 from the elastic locking ring 530; the elastic locking ring 530 can be but is not limited to a ring-shaped structure made of rubber, silicone, or polymer material or other elastic materials, or a spring coil, etc., or a structure with a rigid annular structure made of rigid material in the center and an elastic layer made of rubber, silicone, or polymer material or other elastic materials wrapped around the rigid annular structure. After being sleeved on the outer peripheral surface or the inner peripheral surface of the guiding seat 100, it is in a compressed and taut state, which can provide sufficient frictional force to ensure that the first cable 300 does not break away from the guiding seat 100; the specific shape of the elastic locking ring 530 includes but is not limited to a circular ring, an elliptical ring, a rectangular ring, or other ring shapes.

[0076] Further preferably, on the inner peripheral surface or the outer peripheral surface of the guide seat 100, there is also provided a lock ring fixing groove 120 extending along the radial circumferential direction of the guide seat 100 to further increase the locking force of the elastic lock ring 530.

[0077] Even further preferably, the depth of the lock ring fixing groove 120 is greater than the ring body thickness of the elastic lock ring 530 to limit the elastic lock ring 530 and prevent the elastic lock ring 530 from scratching the blood vessel wall.

[0078] In the second alternative embodiment of the locking structure of this embodiment, referring to Figure 13 , the locking structure includes a first wire fixing groove 540 provided on the outer peripheral surface or the inner peripheral surface of the guide seat 100; the first wire fixing groove 540 includes a first fixing groove 541 and a second fixing groove 542; one end of the first fixing groove 541 is connected to one end of the second fixing groove 542, and the depth of the second fixing groove 542 is greater than the depth of the first fixing groove 541; the first wire 300 passes through the first fixing groove 541; an elastic limit head 310 is provided at the end of the first wire 300 away from the wire seat 200, and the elastic limit head 310 is configured to be compressible to a maximum thickness less than the depth of the first fixing groove 541, and in the case where the elastic limit head 310 is not compressed, the maximum thickness of the elastic limit head 310 is greater than the depth of the first fixing groove 541; the notch of the second fixing groove 542 is configured to limit the elastic limit head 310 within the second fixing groove 542. When the first wire 300 is pulled backward, the elastic limit head undergoes elastic deformation to disengage from the second fixing groove 542 and overcome the friction with the first fixing groove 541 to completely pull out the first wire 300 from the first wire fixing groove 540.

[0079] In addition, continuing to refer to Figures 1 to 9 , in each alternative embodiment of this embodiment, preferably, a ferrule 410 is provided at the free end of each second wire 400, and the first wire 300 sequentially passes through the ferrules 410 at the free ends of multiple second wires 400.

[0080] In addition, in this embodiment, there are various specific connection methods for fixedly connecting one end of the first wire 300 to the wire seat 200. For example, but not limited to, one end of the first wire 300 is fixedly connected to the wire seat 200 by means of bonding or welding, or the first wire 300 is directly integrally formed with the wire seat 200, etc. Among them, continuing to refer to Figures 1 to 9 , preferably, a fixing ring 210 is provided on the wire seat 200, and one end of the first wire 300 is fixedly connected to the wire seat 200 in a manner of passing through the fixing ring 210 and then tying a knot.

[0081] In addition, continuing to refer toFigures 1 to 9 , in various alternative embodiments of the present embodiment, preferably, a plurality of bosses 130 are provided on the outer peripheral surface of the guiding seat 100, and the plurality of bosses 130 are configured to be able to hook the hanging rings at the proximal end of the covered stent 600 to the guiding seat 100. With such a structure, the gap between two adjacent bosses 130 can be used to limit the hanging rings at the proximal end of the covered stent 600 in the collapsed state, ensuring the transportation stability of the covered stent 600 during implantation and avoiding the hanging rings at the proximal end of the covered stent 600 from scratching the blood vessel wall. Among them, the opposite end of the free end of the second wire 400 can be fixedly connected to the boss 130 by connection means such as welding, bonding or fusing. Continuing to refer to Figures 1 to 9 , preferably, a boss through hole 1301 is provided on each of the bosses 130, and the opposite end of the free end of the second wire 400 is fixedly connected inside the boss through hole 1301.

[0082] In addition, continuing to refer to Figures 1 to 9 , in various alternative embodiments of the present embodiment, preferably, a plurality of second wire limiting grooves 140 are provided on the outer peripheral surface or the inner peripheral surface of the guiding seat 100. The plurality of second wire limiting grooves 140 correspond to the plurality of second wires 400 one by one, and one end of each of the plurality of second wire limiting grooves 140 extends to the distal end face of the guiding seat 100. The plurality of second wire limiting grooves 140 are used to accommodate the second wires 400 and limit the second wires 400, avoiding interference between adjacent second wires 400 or between the second wires 400 and other structures during the operation. Among them, further preferably, the depth of the second wire limiting groove 140 is greater than the thickness of the second wire 400 in the direction perpendicular to the extension direction of the length of the second wire 400 itself. For example but not limited to, if the cross-sectional shape of the second wire 400 in the direction perpendicular to the extension direction of the length of the second wire 400 itself is circular, then at this time the depth of the second wire limiting groove 140 is greater than the diameter of the cross-section of the second wire 400 in the direction perpendicular to the extension direction of the length of the second wire 400 itself. Thus, the second wire 400 can be limited by the second wire limiting groove 140, avoiding the second wire 400 from protruding out of the second wire limiting groove 140 and scratching the blood vessel wall, further improving the surgical safety.

[0083] In addition, continuing to refer to Figure 3 , Figure 10 and Figure 11 , in various alternative embodiments of the present embodiment, preferably, the outer peripheral surface of the proximal end of the guiding seat 100 is a frustum side surface with a diameter gradually increasing from the proximal end of the guiding seat 100 towards the distal end of the guiding seat 100. The setting of this frustum side surface can avoid the proximal end of the guiding seat 100 from scratching the blood vessel during the process of advancing the guiding seat 100 by operating the outer tube 730 through the operating handle, so as to protect the blood vessel and further reduce the damage to the blood vessel caused by the operation.

[0084] In addition, in each alternative implementation of this embodiment, preferably, an X-ray developer is connected to the first pull wire 300 and / or the second pull wire 400. Herein, "and / or" means that the X-ray developer is connected only to the first pull wire 300, or only to the second pull wire 400, or to both the first pull wire 300 and the second pull wire 400. In this alternative implementation, during X-ray imaging, the process of pulling the first pull wire 300 and releasing the second pull wire 400 can be clearly detected, enabling a more precise determination of the opening time and position of the covered stent 600 during the release process, thereby improving the surgical accuracy.

[0085] Embodiment 2

[0086] This embodiment provides a covered stent implantation system. Referring to Figure 10 、 Figure 11 and in combination with Figures 1 to 9 and Figure 12 、 Figure 13 ,this covered stent implantation system includes an operating handle, a guide wire tube 710, an inner tube 720, an outer tube 730, and a covered stent post-release device provided in any one of the alternative implementations in Embodiment 1. Specifically: The guide wire tube 710 passes through the inner tube 720 and passes through the second mounting through-hole 201. The proximal end of the guide wire tube 710 is fixed inside the first mounting through-hole 101. The proximal end of the inner tube 720 is fixed to the distal end of the pull wire seat 200. The distal ends of both the outer tube 730 and the inner tube 720 are connected to the operating handle, and the operating handle is configured to be able to drive the outer tube 730 and the inner tube 720 to move forward and backward.

[0087] Since the covered stent implantation system provided in this embodiment includes the covered stent post-release device described in Embodiment 1, the covered stent implantation system provided in this embodiment can achieve all the beneficial effects that the covered stent post-release device in Embodiment 1 can achieve. Its specific structure and achievable effects can be obtained by referring to the various alternative or preferred implementations in Embodiment 1. Among them, in each alternative implementation of this embodiment, preferably, the covered stent implantation system further includes a rear fixator 740. The rear fixator 740 is disposed inside the outer tube 730. The inner tube 720 passes through the rear fixator 740, and the distal end of the rear fixator 740 is connected to the operating handle. The operating handle is further configured to be able to drive the rear fixator 740 to move forward and backward inside the outer tube 730, so that the front end of the rear fixator 740 abuts against or releases the rear end of the covered stent 600, thereby increasing the stability during the implantation of the covered stent 600.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A post - release device for a covered stent, characterized in that: It includes a guide seat (100), a wire drawing seat (200), a first wire (300), a second wire (400) and a locking structure; A plurality of bosses (130) are arranged on the outer peripheral surface of the guide seat (100), and the plurality of bosses (130) are configured to be able to hook the hanging ring at the proximal end of the covered stent (600) on the guide seat (100); Both the first wire (300) and the second wire (400) are made of flexible materials; Taking the direction extending from the proximal end of the guide seat (100) towards the distal end of the guide seat (100) as the axial direction of the guide seat (100), and taking the direction extending from the proximal end of the wire drawing seat (200) towards the distal end of the wire drawing seat (200) as the axial direction of the wire drawing seat (200), a first mounting through hole (101) penetrating the guide seat (100) along the axial direction of the guide seat (100) is arranged on the guide seat (100), and a second mounting through hole (201) penetrating the wire drawing seat (200) along the axial direction of the wire drawing seat (200) is arranged on the wire drawing seat (200); The first wire (300) is coiled around the outer peripheral surface or the inner peripheral surface of the guide seat (100), and one end of the first wire (300) is fixedly connected to the wire drawing seat (200), and the locking structure fixes the other end of the first wire (300) to the guide seat (100); There are multiple second wires (400), one ends of the multiple second wires (400) are all fixedly connected to the guide seat (100), and the multiple second wires (400) are distributed at intervals in pairs around the radial circumferential surface of the guide seat (100). Taking the other end of the second wire (400) as the free end of the second wire (400), a ferrule (410) is arranged at the free end of each second wire (400). The first wire (300) sequentially passes through the ferrules (410) at the free ends of the multiple second wires (400), so that the free ends of the multiple second wires (400) are all fixed between the first wire (300) and the guide seat (100); when the wire drawing seat (200) moves away from the guide seat (100), the first wire (300) can be separated from the guide seat (100), thereby releasing the free ends of the multiple second wires (400).

2. The post - release device for a covered stent according to claim 1, characterized in that: The locking structure includes a spiral groove (510) arranged on the outer peripheral surface or the inner peripheral surface of the guide seat (100). The notch of the spiral groove (510) is configured to be able to squeeze and fix the first wire (300) arranged inside the spiral groove (510) inside the spiral groove (510), so as to squeeze and fix the free end of the second wire (400) between the groove wall of the spiral groove (510) and the first wire (300).

3. The post - release device for a covered stent according to claim 2, characterized in that: The locking structure further includes an elastic tube (520), the elastic tube (520) is fixed inside the spiral groove (510), and the first cable (300) is squeezed and fixed inside the elastic tube (520); alternatively, the elastic tube (520) is squeezed and fixed inside the spiral groove (510), and the first cable (300) is fixed inside the elastic tube (520).

4. The post - release device for a covered stent according to claim 3, characterized in that: The elastic tube (520) includes multiple segments spaced from each other in pairs.

5. The post - release device for a covered stent according to any one of claims 2 to 4, characterized in that: The depth of the spiral groove (510) is greater than the thickness of the first cable (300) in a direction perpendicular to the length of the first cable (300) itself.

6. The post - release device for a covered stent according to claim 3 or 4, characterized in that: The depth of the spiral groove (510) is greater than the diameter of the elastic tube (520).

7. The post - release device for a covered stent according to any one of claims 2 to 4, characterized in that: A first cable threading hole (110) is further provided on the guide seat (100), one end of the first cable threading hole (110) communicates with the distal end face of the guide seat (100), and the other end of the first cable threading hole (110) communicates with a portion of the spiral groove near the distal end of the guide seat.

8. The post - release device for a covered stent according to any one of claims 1 to 4, characterized in that, The locking structure includes an elastic locking ring (530), and the elastic locking ring (530) is configured to: be able to squeeze and fix one end of the first cable (300) away from the cable seat (200) to the outer peripheral surface of the guide seat (100), or squeeze and fix one end of the first cable (300) away from the cable seat (200) to the inner peripheral surface of the guide seat (100).

9. The post - release device for a covered stent according to claim 8, characterized in that, On the inner peripheral surface or the outer peripheral surface of the guide seat (100), a locking ring fixing groove (120) extending along the radial circumferential direction of the guide seat (100) is further provided.

10. The post - release device for a covered stent according to claim 9, characterized in that: The depth of the locking ring fixing groove (120) is greater than the ring body thickness of the elastic locking ring (530).

11. The post - release device for a covered stent according to claim 1, characterized in that: The locking structure includes a first cable fixing groove (540) provided on the outer peripheral surface or the inner peripheral surface of the guide seat (100); The first cable fixing groove (540) includes a first fixing groove (541) and a second fixing groove (542); one end of the first fixing groove (541) is connected to one end of the second fixing groove (542), and the depth of the second fixing groove (542) is greater than the depth of the first fixing groove (541); The first cable (300) passes through the first fixing groove (541); an elastic limiting head (310) is provided at the end of one end of the first cable (300) away from the cable seat (200), and the elastic limiting head (310) is configured to be compressible so that the maximum thickness of the elastic limiting head (310) is less than the depth of the first fixing groove (541), and when the elastic limiting head (310) is not compressed, the maximum thickness of the elastic limiting head (310) is greater than the depth of the first fixing groove (541); The notch of the second fixing groove (542) is configured to be able to limit the elastic limiting head (310) within the second fixing groove (542).

12. The post - release device for a covered stent according to any one of claims 1 to 4 and 11, characterized in that: A fixing ring (210) is provided on the wire drawing seat (200), and one end of the first wire (300) is fixedly connected to the wire drawing seat (200) in a manner that it passes through the fixing ring (210) and is knotted.

13. The post - release device for a covered stent according to claim 1, characterized in that: A boss through hole (1301) is formed on each of the bosses (130), and the opposite end of the free end of the second wire (400) is fixedly connected to the boss through hole (1301).

14. The post - release device for a covered stent according to any one of claims 1 to 4 and 11, characterized in that: A plurality of second wire limiting grooves (140) are formed on the outer peripheral surface or the inner peripheral surface of the guiding seat (100). The plurality of second wire limiting grooves (140) correspond to the plurality of second wires (400) one by one, and one end of each of the plurality of second wire limiting grooves (140) extends to the distal end face of the guiding seat (100).

15. The post-release device for a covered stent according to claim 14, wherein: The depth of the second wire limiting groove (140) is greater than the thickness of the second wire (400) in a direction perpendicular to the extension direction of the second wire (400) itself.

16. The post-release device for a covered stent according to any one of claims 1 to 4 and 11, wherein: The outer peripheral surface of the proximal end of the guiding seat (100) is a conical side surface with a diameter gradually increasing from the proximal end of the guiding seat (100) towards the distal end of the guiding seat (100).

17. The post-release device for a covered stent according to any one of claims 1 to 4 and 11, wherein: An X-ray imaging agent is connected to the first wire (300) and / or the second wire (400).

18. A covered stent implantation system, wherein: It includes an operating handle, a guide wire tube (710), an inner tube (720), an outer tube (730), and a post-release device for a covered stent according to any one of claims 1 to 17; wherein: The guide wire tube (710) passes through the inner tube (720), and the guide wire tube (710) passes through the second mounting through hole (201). The proximal end of the guide wire tube (710) is fixed inside the first mounting through hole (101); the proximal end of the inner tube (720) is fixed to the distal end of the wire drawing seat (200). The distal ends of the outer tube (730) and the inner tube (720) are both connected to the operating handle, and the operating handle is configured to be able to drive the outer tube (730) and the inner tube (720) to move back and forth.

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