Implant conveying system

Abstract

The invention relates to an implant conveying system which comprises a pushing pipe, a conveying pipe and a conveying pipe. One end of the pushing spring is connected with the end, close to the far end, of the pushing pipe; the pushing spring is provided with an inner cavity communicated with the pushing cavity; the pushing spring is provided with a reducing part; one end of the releasing wire penetrates through the pushing cavity, the inner cavity and the limiting space of the reducing part, and the other end of the releasing wire is arranged at the end, close to the near end, of the pushing pipe through a fixator; when the implant is conveyed, a tail ring of the implant is arranged in the inner cavity or the pushing cavity or the limiting space, and one end of the release wire penetrates through the pushing cavity, the inner cavity, the tail ring and the limiting space and fixes the implant; and the end, located in the limiting space, of the release wire is pulled out through the fixator, so that release of the implant is achieved. The release wire is arranged in the limiting space, and the tail ring of the implant is limited, so that the implant is convenient to convey. And only the release wire needs to be pulled out, and the tail ring of the implant loses the limitation of the release wire, so that the implant can be released.

Description

Technical Field

[0001] The present invention relates to the technical field of aneurysm embolization device delivery, and particularly to an implant delivery system. Background Art

[0002] Clinically, interventional embolization is mainly used in the treatment of intracranial aneurysms. Among them, coil embolization has become the mainstream due to advantages such as less trauma and faster recovery. Coil embolization implants coils into the aneurysm cavity through a microcatheter, and uses the mechanical filling effect of the coils and the formation of thrombus to achieve the occlusion of the aneurysm cavity, thereby achieving the purpose of preventing aneurysm rupture. The key technical difficulty affecting the surgical effect lies in the precise release control of the coils. Premature or delayed results of the coils, or deviation of the detachment position, may all lead to surgical failure or the occurrence of complications.

[0003] Currently, the mainstream detachment solution for coils is mechanical detachment technology. Mechanical detachment technology realizes the physical separation of the coil and the pushing device through a precise mechanical structure, and its operation is relatively intuitive and has good controllability. Compared with hydrolysis detachment, mechanical detachment does not require control of the solvent injection volume and is not easily affected by blood vessel tortuosity or branches. Compared with electrolytic detachment, mechanical detachment will not cause local tissue electrocautery in the patient's blood vessels. However, the structure of the mechanical detachment device used in the current mechanical detachment technology is often relatively complex, and there is still room for improvement in achieving precise release of implants under complex blood vessel structures. Summary of the Invention

[0004] To solve or at least partially solve the above technical problems, the present invention provides an implant delivery system.

[0005] The present invention provides an implant delivery system, which includes a pushing tube, a pushing spring, a detaching wire, and a fixator. The pushing tube has a pushing cavity; one end of the pushing spring is connected to the end of the pushing tube close to the distal end; the pushing spring has an inner cavity communicating with the pushing cavity; the pushing spring has a reduced-diameter portion; one end of the detaching wire passes through the pushing cavity, the inner cavity, and the limiting space of the reduced-diameter portion, and the other end of the detaching wire is arranged at the end of the pushing tube close to the proximal end through the fixator; when delivering an implant, the tail ring of the implant is arranged in the inner cavity or the pushing cavity or the limiting space, and one end of the detaching wire passes through the pushing cavity, the inner cavity, the tail ring, and the limiting space to fix the implant; the end of the detaching wire located in the limiting space is pulled out through the fixator to realize the detachment of the implant.

[0006] Optionally, at least one of the reduced-diameter portions is located at the middle position of the pushing spring; from the direction of the proximal end to the direction of the distal end, the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space, and then gradually increases from the second cross-sectional area to the first cross-sectional area.

[0007] Optionally, the reduced-diameter portion is located at one end of the pushing spring near the proximal end; from the direction of the proximal end towards the direction of the distal end, the second cross-sectional area of the limiting space gradually increases to the first cross-sectional area of the inner cavity.

[0008] Optionally, the reduced-diameter portion is located at one end of the pushing spring near the distal end; from the direction of the proximal end towards the direction of the distal end, the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space.

[0009] Optionally, the reduced-diameter portions are located at both ends of the pushing spring; from the direction of the proximal end towards the direction of the distal end, first the second cross-sectional area of the limiting space gradually increases to the first cross-sectional area of the inner cavity, and then the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space.

[0010] Optionally, the pushing spring includes a main wire and a sub-wire. The main wire is helical, has an inner cavity, and one end of the main wire is connected to one end of the pushing tube near the distal end; the sub-wire is a variable-diameter helix, the end with a larger outer diameter of the sub-wire is connected to the main wire, and the end with a smaller outer diameter of the sub-wire forms the reduced-diameter portion; the sub-wire is located at the middle position of the main wire or near one end of the proximal end or near one end of the distal end.

[0011] Optionally, at least two parallel limiting wires are provided in the limiting space of the reduced-diameter portion, and a limiting gap for the release wire to pass through is formed between two adjacent limiting wires.

[0012] Optionally, at least one of the limiting wires has a flexible section, and the flexible section has a helical structure.

[0013] Optionally, the implant delivery system further includes a heat-shrinkable tube sleeved on the pushing spring; the heat-shrinkable tube is made of PET material or FEP material or PTFE material.

[0014] The present invention also provides another implant delivery system, which includes a pushing tube, a pushing spring, an auxiliary spring, and a release wire. The pushing tube has a pushing cavity; one end of the pushing spring is connected to one end of the pushing tube near the distal end; the pushing spring has an inner cavity communicating with the pushing cavity; the auxiliary spring is sleeved on the pushing spring, and there is a limiting gap between the auxiliary spring and the pushing spring; one end of the release wire passes through the pushing cavity, the inner cavity, and the limiting gap, and the other end of the release wire is arranged at one end of the pushing tube near the proximal end through a fixator; when delivering an implant, the tail ring of the implant is arranged in the inner cavity, one end of the release wire passes through the pushing cavity, the inner cavity, the tail ring, and the limiting gap and fixes the implant; the end of the release wire located in the limiting gap is drawn out through the fixator to realize the release of the implant.

[0015] Optionally, the implant delivery system further includes a thermoplastic tube sleeved on the auxiliary spring; the thermoplastic tube is made of Pet material, Fep material or Ptfe material.

[0016] Optionally, the cross-sectional area of the end of the release wire gradually increases from the direction of the proximal end to the direction of the distal end, and a rounded corner is provided at the edge of the end near the distal end.

[0017] In the prior art, the implant delivery structure disclosed in the prior art is relatively complex, which leads to cumbersome operation and poor release stability during the release of the implant.

[0018] Compared with the prior art, the technical solution of the present invention adopts a design concept that is completely opposite to that of the prior art. The prior art adopts a complex mechanical structure, while the present invention adopts a simple mechanical structure, and also achieves the technical effects that can only be achieved by the complex structure in the prior art. The present invention limits and fixes the tail ring of the implant by arranging the release wire in the limiting space of the reduced diameter part, which is convenient for the delivery of the implant. When the implant needs to be released, only the release wire needs to be withdrawn, and the tail ring of the implant loses the restriction of the release wire and can be released. The technical solution of the present invention not only simplifies the operation during the release of the implant, but also improves the release stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the relevant drawings will be briefly introduced below. It can be understood that the drawings described below are only used to illustrate some embodiments of the present invention, and those of ordinary skill in the art can also obtain many other technical features and connection relationships not mentioned in this article based on these drawings.

[0020] Figure 1 is a schematic cross-sectional view of an embodiment of an implant delivery system of the present invention Figure 1 ; Figure 2 is a partial cross-sectional schematic view of an embodiment of an implant delivery system of the present invention Figure 1 ; Figure 3 is a schematic diagram of a cross-sectional area of the inner cavity and the limiting space of an embodiment of an implant delivery system of the present invention; Figure 4 is a partial cross-sectional schematic view of an embodiment of an implant delivery system of the present invention Figure 2 ; Figure 5 is a partial cross-sectional schematic view of an embodiment of an implant delivery system of the present invention Figure 3 ; Figure 6 is a partial cross-sectional schematic view of an embodiment of an implant delivery system of the present inventionFigure 4 ; Figure 7 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 5 ; Figure 8 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 6 ; Figure 9 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 7 ; Figure 10 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 8 ; Figure 11 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 9 ; Figure 12 is a side schematic view of an embodiment of an implant delivery system of the present invention; Figure 13 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 10 ; Figure 14 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 10 One; Figure 15 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 10 Two; Figure 16 is a cross-sectional schematic view of an embodiment of the release wire of an implant delivery system of the present invention; Figure 17 is a cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 2 ; Figure 18 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 10 Three; Figure 19 is a partial cross-sectional schematic of an embodiment of an implant delivery system of the present invention Figure 10 Four.

[0021] Description of reference numerals: 1. Pushing tube; 11. Pushing cavity; 2. Pushing spring; 21. Inner cavity; 22. Reduced-diameter part; 23. Limiting space; 24. Wavy wire; 25. Main wire; 26. Sub-wire; 27. Notch; 3. Release wire; 4. Fixator; 41. Groove; 5. Implant; 51. Tail ring; 61. Limiting wire; 62. Limiting gap; 63. Flexible section; 71. Thermoplastic tube; 72. Auxiliary spring. Detailed implementation manners

[0022] In order to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration purposes only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a sufficient understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0023] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned accompanying drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0024] In the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0025] In addition, the terms "arranged", "connected", "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0026] Unless otherwise specified, the term "plurality" means two or more, and "multiple groups" means two or more groups.

[0027] It should be noted that, without conflict, the embodiments in this disclosure and the features in the embodiments may be combined with each other.

[0028] In the present invention, the distal end refers to the end far from the operator during the operation, and the proximal end refers to the end close to the operator during the operation. The implant includes a stent or an aneurysm embolization device. The implant may adopt an existing implant, and the end of the existing implant close to the proximal end has a tail ring.

[0029] As the current mainstream mechanical detachment technology, the inventor has searched for the existing mechanical detachment technology, and a part of the existing technologies retrieved are as follows: Existing technology 1: A patent for invention with the authorization announcement number CN114504357B.

[0030] Existing technology 2: A utility model patent with the authorization announcement number CN210170107U.

[0031] Existing technology 3: A patent for invention with the authorization announcement number CN109770985B.

[0032] The mechanical structures in the above-mentioned existing technologies are relatively complex, which will result in cumbersome operation during the detachment of the implant and poor detachment stability.

[0033] In view of this, the inventor of the present invention provides an implant delivery system to solve the above problems. The following will make a detailed description of several specific embodiments of the present invention with reference to the accompanying drawings.

[0034] The first embodiment An implant delivery system mentioned in this embodiment, such as Figure 1 、 Figure 2As shown, the implant delivery system includes a push tube 1, a push spring 2, a release wire 3, and a fixator 4. The internal space of the push tube 1 is a push cavity 11. Optionally, the push tube 1 can be made of stainless steel. The internal space of the push spring 2 is an inner cavity 21. Optionally, the push spring 2 can be made of stainless steel, or the push spring 2 can be made of platinum-tungsten alloy, or the push spring 2 can be made of platinum-iridium alloy. The push spring 2 has a reduced-diameter portion 22, and the reduced-diameter portion 22 has a limiting space 23 through which the release wire 3 can pass. One end of the push spring 2 near the proximal end is connected to one end of the push tube 1 near the distal end. When the push spring 2 is connected to the push tube 1, the push spring 2 and the push tube 1 are coaxially arranged, and the inner cavity 21 of the push spring 2 communicates with the push cavity 11 of the push tube 1. One end of the release wire 3 passes through the lumen of the push tube 1 and the inner cavity 21 of the push spring 2 in sequence and enters the limiting space 23 of the reduced-diameter portion 22. The other end of the release wire 3 is arranged in the groove 41 of the fixator 4. The fixator 4 is snap-fitted and fixed to one end of the push tube 1 near the proximal end, and one end of the push tube 1 near the proximal end is located in the groove 41 of the fixator 4, thus completing the connection between the fixator 4 and the push tube 1.

[0035] Optionally, the wire diameter of the release wire 3 is 0.03 mm to 0.1 mm. Such a setting can ensure that the structural strength of the release wire 3 limits the tail ring 51 of the implant 5.

[0036] In this embodiment, the structural design solution of the push spring 2 is as follows: Optionally, as Figure 1 、 Figure 2 shown, the outer diameter of the push spring 2 is less than or equal to the outer diameter of the push tube 1, which strengthens the overall structure of the implant delivery system and facilitates the push tube 1 to drive the push spring 2 to move towards the distal end or the proximal end. In this technical solution, there is a reduced-diameter portion 22 on the push spring 2. Combining Figure 1 with Figure 3 shown, the reduced-diameter portion 22 is arranged at the middle position of the push spring 2. The cross-sectional area of the inner cavity 21 of the push spring 2 is the first cross-sectional area, Figure 3 The dotted line located in the outer circle in Figure 3The dashed line located in the inner circle as shown represents the second cross-sectional area of the limiting space 23, and the first cross-sectional area of the inner cavity 21 is larger than the second cross-sectional area of the limiting space 23. From the direction of the proximal end to the direction of the distal end, the first cross-sectional area of the inner cavity 21 gradually decreases to the second cross-sectional area of the limiting space 23 first, and then the second cross-sectional area of the limiting space 23 gradually increases to the first cross-sectional area of the inner cavity 21. In this technical solution, a reduced-diameter portion 22 provided in the middle of the push spring 2 plays a role in limiting and fixing the release wire 3, and at the same time, it is also convenient for the release wire 3 to be released from the reduced-diameter portion 22.

[0037] The exemplary usage process of the implant delivery system disclosed by the above optional technical solution: As Figure 1 、 Figure 2 shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 into the inner cavity 21 of the push spring 2, and the tail ring 51 of the implant 5 is located at one end close to the proximal end of the limiting space 23 of the reduced-diameter portion 22. Then, the end close to the distal end of the release wire 3 is successively passed through the lumen of the push tube 1, the inner cavity 21 of the push spring 2, the tail ring 5 of the implant 51 into the limiting space 23 of the reduced-diameter portion 22. Of course, one end of the release wire 3 can also pass through the limiting space 23 of the reduced-diameter portion 22 into the inner cavity 21 of the push spring 2. The other end of the release wire 3 is arranged at one end close to the proximal end of the push tube 1 through the fixator 4, so that the fixation of the implant 5 is achieved. When the implant 5 is delivered into the aneurysm, the operator only needs to remove the fixator 4 from the push tube 1, and the fixator 4 drives the release wire 3 to move proximally. When the end of the release wire 3 located in the limiting space 23 is withdrawn, it successively passes through the tail ring 51 of the implant 5, the inner cavity 21 of the push spring 2 and the lumen of the push tube 1. When the end of the release wire 3 located in the limiting space 23 passes through the tail ring 51 of the implant 5, the tail ring 51 of the implant 5 loses the restriction of the release wire 3, and the implant 5 begins to be released and deformed.

[0038] Optionally, as Figure 2 、 Figure 3As shown, based on the above optional technical solution, the structure of the pushing spring 2 is further improved. A plurality of reduced-diameter portions 22 are provided on the pushing spring 2. The plurality of reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the plurality of reduced-diameter portions 22 are arranged at intervals in the length direction of the pushing spring 2. The outer diameters of the plurality of reduced-diameter portions 22 are the same. Specifically, the first cross-sectional area of the inner cavity 21 near the proximal end of a reduced-diameter portion 22 gradually decreases to the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22, and then the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22 gradually increases to the first cross-sectional area of the inner cavity 21 near the distal end of this reduced-diameter portion 22. In this technical solution, by providing a plurality of reduced-diameter portions 22 arranged at intervals on the pushing spring 2, the passing performance of the pushing spring 2 can be improved, which is suitable for the case of tortuous blood vessels.

[0039] Optionally, not shown in the figure, the difference between the technical solution and the above optional technical solution is that a plurality of reduced-diameter portions 22 are provided on the pushing spring 2. The plurality of reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the plurality of reduced-diameter portions 22 are arranged at intervals in the length direction of the pushing spring 2. The outer diameters of the plurality of reduced-diameter portions 22 are different. From the direction of the proximal end to the direction of the distal end, the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease. That is, among the plurality of reduced-diameter portions 22, the outer diameter of the reduced-diameter portion 22 near the proximal end is the largest, and the outer diameter of the reduced-diameter portion 22 near the distal end is the smallest. Specifically, the first cross-sectional area of the inner cavity 21 near the proximal end of a reduced-diameter portion 22 gradually decreases to the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22, and then the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22 gradually increases to the first cross-sectional area of the inner cavity 21 near the distal end of this reduced-diameter portion 22. In this technical solution, through the synergistic cooperation of the technical feature of providing a plurality of reduced-diameter portions 22 arranged at intervals on the pushing spring 2 and the technical feature that the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease from the direction of the proximal end to the direction of the distal end, it is not only convenient to move distally, but also can be flexibly bent and deformed when passing through tortuous blood vessels, reducing the risk that the pushing spring 2 forms sharp corners due to bending when passing through tortuous blood vessels and thus damaging the inner wall of the blood vessel.

[0040] Optionally, based on the above three optional technical solutions, the limiting space 23 of the reduced-diameter portion 22 is coaxially arranged with the inner cavity 21 of the pushing spring 2, which can ensure the coaxiality of the implant 5, the pushing spring 2, the release wire 3, and the pushing tube 1, and is beneficial to the delivery of the implant 5.

[0041] Optionally, based on the above four alternative technical solutions, the push spring 2 is further improved. The outer diameter of the push spring 2 ranges from 0.1 mm to 1 mm. The length of the push spring 2 ranges from 0.5 mm to 10 mm. The wire diameter of the push spring 2 ranges from 0.02 mm to 0.06 mm. By limiting the outer diameter, length, and wire diameter of the push spring 2 and cooperating with the above four alternative technical solutions, it is possible to ensure the structural strength of the push spring 2 while ensuring its flexibility.

[0042] Any one of the above five alternative technical solutions can be selected.

[0043] Compared with the prior art, the technical solution of this embodiment adopts a minimalist structural design concept that is completely opposite to the prior art. The technical solution of this embodiment uses a small number of components but still achieves the technical effects that can be achieved by multiple components. Specifically, by arranging the release wire 3 in the limiting space 23 of the reduced-diameter portion 22, the tail ring 51 of the implant 5 is limited, which is convenient for the delivery of the implant 5. It is also convenient for the release of the implant 5. When the implant 5 needs to be released, only the release wire 3 needs to be withdrawn, and the tail ring 51 of the implant 5 loses the restriction of the release wire 3 and can be released. The technical solution of this embodiment not only simplifies the operation of the implant 5 during the release process but also improves the release stability.

[0044] Second Embodiment This embodiment also proposes an implant delivery system. The second embodiment is a parallel technical solution to the first embodiment. The difference between the second embodiment and the first embodiment lies in the structure of the push spring 2. The specific solution is as follows: Optionally, as Figure 4 、 Figure 5 shown, the outer diameter of the push spring 2 is less than or equal to the outer diameter of the push tube 1, which strengthens the overall structure of the implant delivery system and facilitates the push tube 1 to drive the push spring 2 to move towards the distal end or the proximal end. In this technical solution, a reduced-diameter portion 22 is provided on the push spring 2. Combining Figure 3 with Figure 4 shown, the reduced-diameter portion 22 is provided at one end of the push spring 2 close to the proximal end. The cross-sectional area of the inner cavity 21 of the push spring 2 is the first cross-sectional area, Figure 3 The dotted line located in the outer circle in Figure 3The dashed line located in the inner circle as shown represents the second cross-sectional area of the limiting space 23, and the first cross-sectional area of the inner cavity 21 is larger than the second cross-sectional area of the limiting space 23. From the direction of the proximal end towards the direction of the distal end, the second cross-sectional area of the limiting space 23 gradually increases to the first cross-sectional area of the inner cavity 21. In this technical solution, by providing a reduced-diameter portion 22 at one end of the pushing spring 2 close to the proximal end, the reduced-diameter portion 22 plays a role in limiting and fixing the release wire 3. At the same time, it also facilitates the release of the release wire 3 from the reduced-diameter portion 22. Such a setting enables the pushing spring 2 to bend and deform when entering the tortuous blood vessel, and can reduce the stiffness of the end of the pushing spring 2 close to the distal end, and is not likely to damage the inner wall of the blood vessel.

[0045] The exemplary usage process of the implant delivery system disclosed in the above optional technical solution: As Figure 4 , Figure 5 shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then pass the tail ring 51 of the implant 5 through the inner cavity 21 of the pushing spring 2 into the pushing cavity 11 of the pushing tube 1, and the tail ring 51 of the implant 5 is located at one end of the limiting space 23 of the reduced-diameter portion 22 close to the proximal end. Then pass the end of the release wire 3 close to the distal end through the lumen of the pushing tube 1, the tail ring 51 of the implant 5 in sequence into the limiting space 23 of the reduced-diameter portion 22. Of course, one end of the release wire 3 can also pass through the limiting space 23 of the reduced-diameter portion 22 into the inner cavity 21 of the pushing spring 2. The other end of the release wire 3 is arranged at one end of the pushing tube 1 close to the proximal end through the fixator 4, thus realizing the fixation of the implant 5. When the implant 5 is delivered into the aneurysm, the operator only needs to remove the fixator 4 from the pushing tube 1. The fixator 4 drives the release wire 3 to move towards the proximal end. When the end of the release wire 3 located in the limiting space 23 is withdrawn, it passes through the tail ring 51 of the implant 5 and the lumen of the pushing tube 1 in sequence. When the end of the release wire 3 located in the limiting space 23 passes through the tail ring 51 of the implant 5, the tail ring 51 of the implant 5 loses the restriction of the release wire 3, and the implant 5 starts to be released and deformed.

[0046] Optionally, as Figure 3 , Figure 5As shown, on the basis of the above optional technical solution, the structure of the pushing spring 2 is further improved. A plurality of reduced-diameter portions 22 are provided on the pushing spring 2. Among them, one reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the proximal end. Specifically, the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22 gradually increases to the first cross-sectional area of the inner cavity 21 of this reduced-diameter portion 22 close to the distal end. The remaining reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the remaining reduced-diameter portions 22 are arranged at intervals along the length direction of the pushing spring 2, and the outer diameters of these reduced-diameter portions 22 are the same. Specifically, first, the first cross-sectional area of the inner cavity 21 of one reduced-diameter portion 22 close to the proximal end gradually decreases to the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22, and then the second cross-sectional area of the limiting space 23 of this reduced-diameter portion 22 gradually increases to the first cross-sectional area of the inner cavity 21 of this reduced-diameter portion 22 close to the distal end. In this technical solution, not only by providing a plurality of reduced-diameter portions 22 arranged at intervals on the pushing spring 2, the passing performance of the pushing spring 2 can be improved, which is suitable for the situation of tortuous blood vessels, but also by arranging one reduced-diameter portion 22 at one end of the pushing spring 2 close to the proximal end, it is convenient for the pushing spring 2 to bend and deform when entering the tortuous blood vessel, and the stiffness of the end of the pushing spring 2 close to the distal end can be reduced, and it is not easy to damage the inner wall of the blood vessel.

[0047] Optionally, not shown in the figure, the difference between this technical solution and the above optional technical solution is that a plurality of reduced-diameter portions 22 are provided on the pushing spring 2. Among them, one reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the proximal end, and the remaining reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the remaining reduced-diameter portions 22 are arranged at intervals along the length direction of the pushing spring 2, and the outer diameters of these reduced-diameter portions 22 are different. From the direction where the proximal end is located towards the direction where the distal end is located, the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease. That is, among the plurality of reduced-diameter portions 22, the outer diameter of the reduced-diameter portion 22 close to the proximal end is the largest, and the outer diameter of the reduced-diameter portion 22 close to the distal end is the smallest. In this technical solution, through the coordinated cooperation of the technical feature of providing a plurality of reduced-diameter portions 22 arranged at intervals on the pushing spring 2 and one reduced-diameter portion 22 being provided at one end of the pushing spring 2 close to the proximal end and the technical feature that the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease from the direction where the proximal end is located towards the direction where the distal end is located, it is not only convenient to move towards the distal end, but also can flexibly bend and deform when passing through the tortuous blood vessel, reduce the stiffness of the end of the pushing spring 2 close to the distal end, and it is not easy to damage the inner wall of the blood vessel.

[0048] Optionally, as Figure 6As shown, based on the above three alternative technical solutions, a reduced-diameter portion 22 is provided at one end of the push spring 2 near the proximal end. One end of the reduced-diameter portion 22 near the proximal end is connected to one end of the push tube 1 near the distal end, and the connection between the reduced-diameter portion 22 and the push tube 1 is located on one side of the axis of the push spring 2. A corrugated wire 24 is also provided between the push spring 2 and the push tube 1. One end of the corrugated wire 24 is connected to one end of the push tube 1 near the distal end, and the other end of the corrugated wire 24 is connected to one end of the push spring 2 near the proximal end, and the other end of the corrugated wire 24 is located outside the reduced-diameter portion 22. The corrugated wire 24 is located on the other side of the axis of the push spring 2 and is disposed opposite to the connection between the reduced-diameter portion 22 and the push tube 1. Such a setting can not only ensure the structural strength between the push spring 2 and the push tube 1, but also facilitate the flexible bending deformation of the push spring 2.

[0049] For any of the above four alternative technical solutions, any one can be selected.

[0050] Third Embodiment This embodiment also proposes an implant delivery system. The third embodiment is an alternative technical solution to the first or second embodiment. The difference between the third embodiment and the first or second embodiment lies in the structure of the push spring 2. The specific solution is as follows: Optionally, as Figure 7 , Figure 8 shown, the outer diameter of the push spring 2 is less than or equal to the outer diameter of the push tube 1, which strengthens the overall structure of the implant delivery system and facilitates the push tube 1 to drive the push spring 2 to move towards the distal end or the proximal end. In this technical solution, a reduced-diameter portion 22 is provided on the push spring 2. Combining Figure 7 with Figure 3 shown, the reduced-diameter portion 22 is provided at one end of the push spring 2 near the distal end. The cross-sectional area of the inner cavity 21 of the push spring 2 is the first cross-sectional area, Figure 3 The dotted line located in the outer circle in Figure 3 represents the first cross-sectional area of the inner cavity 21. The cross-sectional area of the limiting space 23 of the reduced-diameter portion 22 is the second cross-sectional area,

[0051] The dotted line located in the inner circle in represents the second cross-sectional area of the limiting space 23. The first cross-sectional area of the inner cavity 21 is larger than the second cross-sectional area of the limiting space 23. From the direction of the proximal end towards the direction of the distal end, the first cross-sectional area of the inner cavity 21 gradually decreases to the second cross-sectional area of the limiting space 23. In this technical solution, by providing a reduced-diameter portion 22 at one end of the push spring 2 near the distal end, the reduced-diameter portion 22 plays a role in limiting and fixing the release wire 3. At the same time, it also facilitates the release wire 3 to be released from the reduced-diameter portion 22. Such a setting facilitates the movement of the push spring 2 towards the distal end. Optionally, the reduced-diameter portion 22 is coaxially arranged with the push spring 2, or the reduced-diameter portion 22 is provided on one side of the axis of the push spring 2.Exemplary usage process of the implant delivery system disclosed by the above optional technical solution: As Figure 7 , Figure 8 shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 into the inner cavity 21 of the push spring 2, and the tail ring 51 of the implant 5 is located at one end close to the proximal end of the limiting space 23 of the reduced diameter portion 22. Then, the end close to the distal end of the release wire 3 is successively passed through the lumen of the push tube 1, the inner cavity 21 of the push spring 2, the tail ring 51 of the implant 5 into the limiting space 23 of the reduced diameter portion 22, and the other end of the release wire 3 is arranged at the end close to the proximal end of the push tube 1 through the fixator 4, thus realizing the fixation of the implant 5. When the implant 5 is delivered into the aneurysm, the operator only needs to remove the fixator 4 from the push tube 1, and the fixator 4 drives the release wire 3 to move towards the proximal end. When the end of the release wire 3 located in the limiting space 23 is withdrawn, it successively passes through the tail ring 51 of the implant 5, the inner cavity 21 of the push spring 2 and the lumen of the push tube 1. When the end of the release wire 3 located in the limiting space 23 passes through the tail ring 51 of the implant 5, the tail ring 51 of the implant 5 loses the restriction of the release wire 3, and the implant 5 begins to be released and deformed.

[0052] Optionally, as Figure 8 shown, on the basis of the above optional technical solution, the structure of the push spring 2 is further improved. A plurality of reduced diameter portions 22 are provided on the push spring 2. Among them, one reduced diameter portion 22 is arranged at the end close to the distal end of the push spring 2. Specifically, the first cross-sectional area of the inner cavity 21 close to the proximal end of this reduced diameter portion 22 gradually decreases to the second cross-sectional area of the limiting space 23 of this reduced diameter portion 22. The remaining reduced diameter portions 22 are all located between the two ends of the push spring 2, and the remaining reduced diameter portions 22 are arranged at intervals along the length direction of the push spring 2, and the outer diameters of these reduced diameter portions 22 are all the same. Specifically, first, the first cross-sectional area of the inner cavity 21 close to the proximal end of one reduced diameter portion 22 gradually decreases to the second cross-sectional area of the limiting space 23 of this reduced diameter portion 22, and then the second cross-sectional area of the limiting space 23 of this reduced diameter portion 22 gradually increases to the first cross-sectional area of the inner cavity 21 close to the distal end of this reduced diameter portion 22. In this technical solution, such a setting not only facilitates the movement towards the distal end but also is applicable to tortuous blood vessels.

[0053] Optionally, not shown in the figure, the difference between this technical solution and the above-mentioned optional technical solution is that a plurality of reduced-diameter portions 22 are provided on the pushing spring 2. Among them, one reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the distal end, and the remaining reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the remaining reduced-diameter portions 22 are arranged at intervals in the length direction of the pushing spring 2, and the outer diameters of these reduced-diameter portions 22 are different. From the direction where the proximal end is located towards the direction where the distal end is located, the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease. That is, among the plurality of reduced-diameter portions 22, the outer diameter of the reduced-diameter portion 22 close to the proximal end is the largest, and the outer diameter of the reduced-diameter portion 22 close to the distal end is the smallest. In this technical solution, such a setting not only facilitates the movement towards the distal end, but also is more suitable for tortuous blood vessels.

[0054] Any one of the above three optional technical solutions can be selected.

[0055] Fourth Embodiment This embodiment also proposes an implant delivery system. The fourth embodiment is an alternative technical solution to any one of the first to third embodiments. The difference in the fourth embodiment lies in the structure of the pushing spring 2. The specific solution is as follows: Optionally, as Figure 9 , Figure 10 shown, the outer diameter of the pushing spring 2 is less than or equal to the outer diameter of the pushing tube 1, which strengthens the overall structure of the implant delivery system and facilitates the pushing tube 1 to drive the pushing spring 2 to move towards the distal end or the proximal end. In this technical solution, two reduced-diameter portions 22 are provided on the pushing spring 2. Combining Figure 9 with Figure 3 shown, one reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the proximal end, and the other reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the distal end. The cross-sectional area of the inner cavity 21 of the pushing spring 2 is the first cross-sectional area, Figure 3 the dotted line located in the outer circle in Figure 3The dashed line located in the inner circle as shown represents the second cross-sectional area of the limiting space 23, and the first cross-sectional area of the inner cavity 21 is larger than the second cross-sectional area of the limiting space 23. From the direction of the proximal end to the direction of the distal end, first, the second cross-sectional area of the limiting space 23 gradually increases to the first cross-sectional area of the inner cavity 21, and then the first cross-sectional area of the inner cavity 21 gradually decreases to the second cross-sectional area of the limiting space 23. In this technical solution, by respectively arranging a reduced-diameter portion 22 at one end of the pushing spring 2 close to the proximal end and at one end of the pushing spring 2 close to the distal end, the reduced-diameter portion 22 close to the proximal end plays a positioning and guiding role, facilitating the threading of the detachable wire 3, and at the same time, it also facilitates the bending deformation of the pushing spring 2 when entering the tortuous blood vessel. The reduced-diameter portion 22 close to the distal end plays a limiting and fixing role, and at the same time, it also facilitates the detachment of the detachable wire 3 and the movement towards the distal end. The implant delivery system in this technical solution is more suitable for tortuous blood vessels.

[0056] The exemplary use process of the implant delivery system disclosed in the above optional technical solution: As Figure 9 , Figure 10 shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 into the inner cavity 21 of the pushing spring 2, and the tail ring 51 of the implant 5 is located at one end close to the proximal end of the limiting space 23 of the reduced-diameter portion 22 close to the distal end. Then, the end close to the distal end of the detachable wire 3 is successively threaded through the lumen of the push tube 1, the limiting space 23 of the reduced-diameter portion 22 close to the proximal end, the inner cavity 21 of the pushing spring 2, the tail ring 51 of the implant 5 into the limiting space 23 of the reduced-diameter portion 22 close to the distal end. The other end of the detachable wire 3 is arranged at one end close to the proximal end of the push tube 1 through the fixator 4, thus realizing the fixation of the implant 5. When the implant 5 is delivered into the aneurysm, the operator only needs to remove the fixator 4 from the push tube 1, and the fixator 4 drives the detachable wire 3 to move towards the proximal end. When the end of the detachable wire 3 located in the limiting space 23 of the reduced-diameter portion 22 close to the distal end is withdrawn, it successively passes through the tail ring 51 of the implant 5, the inner cavity 21 of the pushing spring 2, the limiting space 23 of the reduced-diameter portion 22 close to the proximal end, and the lumen of the push tube 1. When the end of the detachable wire 3 located in the limiting space 23 of the reduced-diameter portion 22 close to the distal end passes through the tail ring 51 of the implant 5, the tail ring 51 of the implant 5 loses the restriction of the detachable wire 3, and the implant 5 begins to be detached and deformed.

[0057] Optionally, not shown in the figures, based on the above optional technical solution, a plurality of reduced-diameter portions 22 are provided on the pushing spring 2. Among them, one reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the proximal end, and another reduced-diameter portion 22 is provided at one end of the pushing spring 2 close to the distal end. The remaining reduced-diameter portions 22 are all located between the two ends of the pushing spring 2, and the remaining reduced-diameter portions 22 are arranged at intervals in the length direction of the pushing spring 2. The outer diameters of these reduced-diameter portions 22 are different. From the direction where the proximal end is located towards the direction where the distal end is located, the outer diameters of the plurality of reduced-diameter portions 22 gradually decrease. That is, among the plurality of reduced-diameter portions 22, the outer diameter of the reduced-diameter portion 22 close to the proximal end is the largest, and the outer diameter of the reduced-diameter portion 22 close to the distal end is the smallest. In this technical solution, such a setting not only facilitates movement towards the distal end but also is more suitable for tortuous blood vessels.

[0058] Either of the above two optional technical solutions can be selected.

[0059] Fifth Embodiment This embodiment also proposes an implant delivery system. The fifth embodiment is an alternative technical solution to any one of the first to fourth embodiments. The difference in the fifth embodiment is that the pushing spring 2 includes a main wire 25 and at least one sub-wire 26. The specific solution is as follows: Optionally, as Figure 11 , Figure 12 shown, the pushing spring 2 includes a main wire 25 and a sub-wire 26. The structure of the main wire 25 is helical, and the internal space of the helical main wire 25 is the inner cavity 21. The outer diameter of the main wire 25 is less than or equal to the outer diameter of the pushing tube 1. One end of the main wire 25 close to the proximal end is connected to one end of the pushing tube 1 close to the distal end. The number of sub-wires 26 is one. The structure of this sub-wire 26 is a variable-diameter helix, and the outer diameter of one end of the variable-diameter helical sub-wire 26 is greater than the outer diameter of the other end. The sub-wire 26 is arranged in the inner cavity 21 of the main wire 25, and the end with the larger outer diameter of the sub-wire 26 is connected to the main wire 25, while the end with the smaller outer diameter of the sub-wire 26 is wound around a reduced-diameter ring in a ring structure. This reduced-diameter ring can be regarded as the reduced-diameter portion 22, and the ring hole of the reduced-diameter ring can be regarded as the limiting space 23. The reduced-diameter portion 22 is coaxially arranged with the inner cavity 21 of the main wire 25. Optionally, this sub-wire 26 is located at the middle position of the main wire 25, or this sub-wire 26 is located at one end of the main wire 25 close to the proximal end, or this sub-wire 26 is located at one end of the main wire 25 close to the distal end. Optionally, the exemplary use process of the implant delivery system disclosed in the above optional technical solution is the same as the exemplary use process of the implant delivery system disclosed in the first embodiment.

[0060] Optionally, as Figure 13As shown, the difference between this technical solution and the above optional technical solutions is that the number of sub-wires 26 is multiple, and the multiple sub-wires 26 are arranged at intervals in the length direction along the axis of the main wire 25. Among these sub-wires 26, one sub-wire 26 close to the distal end plays a role in limiting and fixing the release wire 3, and the remaining sub-wires 26 play a role in positioning and guiding.

[0061] For the above two optional technical solutions, either one can be selected.

[0062] Sixth Embodiment This embodiment also proposes an implant delivery system. The sixth embodiment is a further improvement based on any one of the first to fifth embodiments, and the main improvements are as follows: Optionally, as Figure 11 、 Figure 12 shown, the implant delivery system further includes at least two limiting wires 61. For the convenience of introducing this technical solution, two limiting wires 61 are taken as an example for introduction. The two limiting wires 61 are parallel to each other, and a limiting gap 62 is formed between the two limiting wires 61, and this limiting gap 62 can be penetrated by the release wire 3. Both limiting wires 61 are located in the limiting space 23 of the diameter-reducing portion 22. Optionally, both ends of the two limiting wires 61 are respectively connected to the pushing spring 2, or both ends of the two limiting wires 61 are respectively connected to the diameter-reducing rings located on the sub-wires 26. When delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 in the inner cavity 21 of the pushing spring 2, and the tail ring 51 of the implant 5 is located at the proximal end of the limiting space 23 of the diameter-reducing portion 22. Then, the distal end of the release wire 3 is sequentially penetrated through the lumen of the pushing tube 1, the inner cavity 21 of the pushing spring 2, the tail ring 51 of the implant 5 into the limiting gap 62. Of course, one end of the release wire 3 can also pass through the limiting gap 62 into the inner cavity 21 of the pushing spring 2. The other end of the release wire 3 is arranged at the proximal end of the pushing tube 1 through the fixator 4, so as to realize the fixation of the implant 5.

[0063] Optionally, as Figure 12 shown, on the basis of the above optional technical solution, the limiting wire 61 is further improved. Among two adjacent limiting wires 61, at least one limiting wire 61 has a flexible section 63, and the flexible section 63 is arranged in a spiral shape, that is, the flexible section 63 can be regarded as having a spiral structure. By arranging the spiral flexible section 63 on the limiting wire 61, the limiting wire 61 with the flexible section 63 can have an elastic variable. When the release wire 3 is pulled out, the flexible section 63 moves towards the proximal end and undergoes elastic deformation. By means of the elastic deformation of the flexible section 63, the risk of the limiting wire 61 breaking when the release wire 3 is pulled out can be reduced.

[0064] Either of the above two alternative technical solutions can be selected.

[0065] Seventh Embodiment This embodiment also proposes an implant delivery system. The seventh embodiment is a further improvement based on any one of the first to sixth embodiments. The main improvements are as follows: Optionally, as Figure 14 shown, the implant delivery system further includes a heat shrinkable tube 71. The heat shrinkable tube 71 is sleeved on the push spring 2, and the heat shrinkable tube 71 is processed by hot air so that the heat shrinkable tube 71 covers the push spring 2. Such a setting can make the outer surface of the push spring 2 cleaner and smoother, avoid obstacles during the process of delivering the implant 5 in the microcatheter by the push spring 2, and also facilitate the delivery of the implant 5. Optionally, the heat shrinkable tube 71 can be made of PET plastic (the Chinese name is polyethylene terephthalate), or the heat shrinkable tube 71 can be made of FEP plastic (the Chinese name is perfluoroethylene propylene copolymer), or the heat shrinkable tube 71 can be made of PTFE plastic (the Chinese name is polytetrafluoroethylene).

[0066] Optionally, as Figure 14 shown, the above alternative technical solution is combined with the technical solution in the third embodiment that the reduced diameter portion 22 is arranged on one side of the axis of the push spring 2. When the reduced diameter portion 22 is located on one side of the axis of the push spring 2, the outer diameter of the push spring 2 is 2 to 4 times the outer diameter of the reduced diameter portion 22, and a notch 27 is formed between the push spring 2 and the reduced diameter portion 22. When the heat shrinkable tube 71 is sleeved on the push spring 2, the heat shrinkable tube 71 covers the push spring 2 and the reduced diameter portion 22 and also covers the notch 27. When delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then pass the tail ring 51 of the implant 5 through the notch 27 into the inner cavity 21 of the push spring 2, and the tail ring 51 of the implant 5 is located at one end close to the proximal end of the limiting space 23 of the reduced diameter portion 22. Then, the end of the release wire 3 close to the distal end is successively passed through the lumen of the push tube 1, the inner cavity 21 of the push spring 2, the tail ring 51 of the implant 5 into the limiting space 23. The other end of the release wire 3 is arranged at the proximal end of the push tube 1 through the fixator 4, so that the fixation of the implant 5 is realized. Of course, in the present invention, as Figure 15As shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 in the limiting space 23 of the reduced-diameter portion 22. Then, pass the end of the release wire 3 near the distal end through the lumen of the push tube 1, the inner cavity 21 of the push spring 2 in sequence, and enter the limiting space 23 to pass through the tail ring 51 of the implant 5 to limit and fix the implant. The other end of the release wire 3 is arranged at the proximal end of the push tube 1 through the fixator 4, thus realizing the fixation of the implant 5.

[0067] Optionally, as Figure 16 shown, in this technical solution, the structure of the end of the release wire 3 near the distal end is improved. The cross-sectional area of the end of the release wire 3 near the distal end gradually increases from the direction of the proximal end to the direction of the distal end to twice the cross-sectional area of the release wire 3, and a fillet is provided at the edge near the distal end of the end of the release wire 3 near the distal end. Such a structure is more convenient for the end of the release wire 3 near the distal end to be arranged in the limiting space 23 of the reduced-diameter portion 22 and limit the tail ring 51 of the implant 5, and is also convenient for the release of the implant 5.

[0068] Any one of the above three optional technical solutions can be selected.

[0069] Eighth Embodiment Another implant delivery system mentioned in this embodiment, as Figure 17 , Figure 18As shown, the implant delivery system includes a push tube 1, a push spring 2, an auxiliary spring 72, and a release wire 3. The internal space of the push tube 1 is a push cavity 11. Optionally, the push tube 1 can be made of stainless steel. The internal space of the push spring 2 is an inner cavity 21. Optionally, the push spring 2 can be made of stainless steel, or the push spring 2 can be made of platinum-tungsten alloy, or the push spring 2 can be made of platinum-iridium alloy. One end of the push spring 2 near the proximal end is connected to one end of the push tube 1 near the distal end. When the push spring 2 is connected to the push tube 1, the push spring 2 and the push tube 1 are coaxially arranged, and the inner cavity 21 of the push spring 2 communicates with the push cavity 11 of the push tube 1. The outer diameter of the auxiliary spring 72 is equal to or smaller than the outer diameter of the push tube 1, and the inner diameter of the auxiliary spring 72 is equal to or larger than the outer diameter of the push spring 2. Such a setting not only facilitates the push tube 1 to drive the push spring 2 to drive the auxiliary spring 72 to move towards the distal end or the proximal end, but also facilitates the auxiliary spring 72 to be sleeved on the push spring 2. When the auxiliary spring 72 is sleeved on the push spring 2 and both ends of the auxiliary spring 72 are connected to the push spring 2, a limiting gap 62 for the release wire 3 to pass through is formed between the auxiliary spring 72 and the push spring 2. One end of the release wire 3 near the distal end passes through the lumen of the push tube 1 and enters the inner cavity 21 of the push spring 2, and then passes through the limiting gap 62 between the auxiliary spring 72 and the push spring 2 and re-enters the inner cavity 21 of the push spring 2. The other end of the release wire 3 is arranged in the groove 41 of the fixator 4. The fixator 4 is snap-fitted and fixed to one end of the push tube 1 near the proximal end, and one end of the push tube 1 near the proximal end is located in the groove 41 of the fixator 4, thus completing the connection between the fixator 4 and the push tube 1.

[0070] Optionally, the spiral direction of the auxiliary spring 72 is opposite to the spiral direction of the push spring 2. For example, if the spiral direction of the push spring 2 is left-handed, the spiral direction of the auxiliary spring 72 is right-handed. Such a setting facilitates the formation of the limiting gap 62 between the auxiliary spring 72 and the push spring 2.

[0071] The exemplary usage process of the implant delivery system disclosed in this embodiment: As Figure 17 、 Figure 18As shown, when delivering the implant 5, first bend the tail ring 51 of the implant 5 towards one side along the length direction of the implant 5, and then place the tail ring 51 of the implant 5 into the inner cavity 21 of the push spring 2. Then, insert the end of the release wire 3 near the distal end into the lumen of the push tube 1 and enter the inner cavity 21 of the push spring 2, passing through the tail ring 51 of the implant 5 and the limiting gap 62 between the auxiliary spring 72 and the push spring 2, and then re-enter the inner cavity 21 of the push spring 2. The other end of the release wire 3 is arranged at the proximal end of the push tube 1 through the fixator 4, thus realizing the fixation of the implant 5. When the implant 5 is delivered into the aneurysm, the operator only needs to remove the fixator 4 from the push tube 1. The fixator 4 drives the release wire 3 to move proximally. When the end of the release wire 3 that is limited and fixed is withdrawn, it successively passes through the limiting gap 62, the tail ring 51 of the implant 5, the inner cavity 21 of the push spring 2, and the lumen of the push tube 1. When the end of the release wire 3 that is limited and fixed passes through the tail ring 51 of the implant 5, the tail ring 51 of the implant 5 loses the restriction of the release wire 3, and the implant 5 begins to be released and deformed.

[0072] Compared with the prior art, in this embodiment, by using a small number of components, the same technical effects achieved by multiple components are also realized. Specifically, by arranging one end of the release wire 3 in the limiting gap 62, the tail ring 51 of the implant 5 is limited and fixed, which is convenient for the delivery of the implant 5. It is also convenient for the release of the implant 5. When the implant 5 needs to be released, only the release wire 3 needs to be withdrawn, and the tail ring 51 of the implant 5 loses the restriction of the release wire 3 and can be released. The technical solution of this embodiment not only simplifies the operation of the implant 5 during the release process but also improves the release stability.

[0073] Ninth Embodiment This embodiment also proposes an implant delivery system. The ninth embodiment is a further improvement based on the eighth embodiment, and the main improvements are as follows: Optionally, as Figure 19As shown, the implant delivery system further includes a thermoplastic tube 71. The auxiliary spring 72 can be made of a radiopaque material to facilitate the operator's observation of the position of the auxiliary spring 72 under fluoroscopy. The auxiliary spring 72 is sleeved on the pushing spring 2, and the thermoplastic tube 71 is sleeved on the auxiliary spring 72. The thermoplastic tube 71 is processed by hot air so that the thermoplastic tube 71 covers the auxiliary spring 72. Such a setting can make the outer surface of the auxiliary spring 72 cleaner and smoother, avoid obstacles during the delivery of the implant 5 in the microcatheter by the auxiliary spring 72, and also facilitate the delivery of the implant 5. Optionally, the thermoplastic tube 71 can be made of PET plastic (the Chinese name is polyethylene terephthalate), or the thermoplastic tube 71 can be made of FEP plastic (the Chinese name is fluorinated ethylene propylene copolymer), or the thermoplastic tube 71 can be made of PTFE plastic (the Chinese name is polytetrafluoroethylene).

[0074] Optionally, as Figure 16 、 Figure 17 shown, in this technical solution, the structure of the end of the release wire 3 near the distal end is improved. The cross-sectional area of the end of the release wire 3 near the distal end gradually increases from the proximal direction to the distal direction to twice the cross-sectional area of the release wire 3, and a rounded corner is provided at the edge of the end of the release wire 3 near the distal end close to the distal end. Such a structure is more convenient for the end of the release wire 3 near the distal end to be arranged in the limiting gap 62 and limit the tail ring 51 of the implant 5, and is also convenient for the release of the implant 5.

[0075] Optionally, as Figure 17 、 Figure 18 shown, the connection method between the auxiliary spring 72 and the pushing spring 2 is further improved. When the auxiliary spring 72 is sleeved on the pushing spring 2, the end of the auxiliary spring 72 near the distal end is connected to the pushing spring 2, and the end of the auxiliary spring 72 near the proximal end can move proximally along the length direction of the pushing spring 2. Or the end of the auxiliary spring 72 near the proximal end is connected to the pushing spring 2, and the end of the auxiliary spring 72 near the distal end can move proximally along the length direction of the pushing spring 2. Such a setting is more convenient for the end of the release wire 3 near the distal end to be pulled out from the limiting gap 62, which is beneficial to the release of the implant 5.

[0076] In the present invention, both ends of the pushing spring 2 can be wound into circular rings. Both ends of the auxiliary spring 72 can be wound into circular rings.

[0077] Finally, it should be noted that those of ordinary skill in the art can understand that in order to enable readers to better understand the present invention, many technical details are proposed in the embodiments of the present invention. However, even without these technical details and various changes and modifications based on the above embodiments, the technical solutions claimed in each claim of the present invention can be basically realized. Therefore, in practical applications, various changes can be made to the above embodiments in form and details without departing from the spirit and scope of the present invention.

Claims

1. An implant delivery system, characterized in that, Comprising: A pushing tube having a pushing cavity; A pushing spring with one end connected to the end of the pushing tube near the distal end; The pushing spring has an inner cavity communicating with the pushing cavity; The pushing spring has a reduced-diameter portion; A release wire, one end of which passes through the pushing cavity, the inner cavity, and the limiting space of the reduced-diameter portion, and the other end is arranged at the end of the pushing tube near the proximal end through a fixator; When delivering an implant, the tail ring of the implant is arranged in the inner cavity or the pushing cavity or the limiting space, and one end of the release wire passes through the pushing cavity, the inner cavity, the tail ring, and the limiting space to fix the implant; One end of the release wire located in the limiting space is drawn out through the fixator to realize the release of the implant.

2. The implant delivery system according to claim 1, wherein At least one of the reduced-diameter portions is located at the middle position of the pushing spring; From the direction of the proximal end to the direction of the distal end, the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space, and then gradually increases from the second cross-sectional area to the first cross-sectional area.

3. The implant delivery system according to claim 1, wherein The reduced-diameter portion is located at the end of the pushing spring near the proximal end; From the direction of the proximal end to the direction of the distal end, the second cross-sectional area of the limiting space gradually increases to the first cross-sectional area of the inner cavity.

4. The implant delivery system according to claim 1, wherein The reduced-diameter portion is located at the end of the pushing spring near the distal end; From the direction of the proximal end to the direction of the distal end, the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space.

5. The implant delivery system according to claim 1, wherein The reduced-diameter portions are located at both ends of the pushing spring; From the direction of the proximal end to the direction of the distal end, first the second cross-sectional area of the limiting space gradually increases to the first cross-sectional area of the inner cavity, and then the first cross-sectional area of the inner cavity gradually decreases to the second cross-sectional area of the limiting space.

6. The implant delivery system according to claim 1, wherein The pushing spring comprises: A main wire in a spiral shape, having an inner cavity, and one end connected to the end of the pushing tube near the distal end; A sub-wire in a variable-diameter spiral shape, the end with a larger outer diameter is connected to the main wire, and the end with a smaller outer diameter forms the reduced-diameter portion; The sub-wire is located at the middle position of the main wire or at the end near the proximal end or at the end near the distal end.

7. The implant delivery system according to any one of claims 1 to 6, wherein At least two parallel limiting wires are arranged in the limiting space of the reduced-diameter portion, and a limiting gap for the release wire to pass through is formed between two adjacent limiting wires.

8. The implant delivery system according to claim 7, wherein At least one of the limiting wires has a flexible section, and the flexible section is in a spiral structure.

9. The implant delivery system according to claim 1, wherein Further comprising: A heat shrinkable tube sleeved on the pushing spring; The heat shrinkable tube is made of Pet material or Fep material or Ptfe material.

10. An implant delivery system, characterized in that, Comprising: A pushing tube having a pushing cavity; A pushing spring with one end connected to the end of the pushing tube near the distal end; The pushing spring has an inner cavity communicating with the pushing cavity; An auxiliary spring sleeved on the pushing spring, and there is a limiting gap between the auxiliary spring and the pushing spring; The release wire has one end passing through the pushing cavity, the inner cavity, and the limiting gap, and the other end is arranged at one end of the pushing tube near the proximal end through a fixator; When delivering the implant, the tail ring of the implant is arranged in the inner cavity, and one end of the release wire passes through the pushing cavity, the inner cavity, the tail ring, and the limiting gap to fix the implant; One end of the release wire located in the limiting gap is drawn out through the fixator to release the implant.

11. The implant delivery system according to claim 10, wherein, It further includes: A heat shrinkable tube sleeved on the auxiliary spring; The heat shrinkable tube is made of PET material or FEP material or PTFE material.

12. The implant delivery system according to claim 10, wherein The cross-sectional area of the end of one end of the release wire gradually increases from the direction where the proximal end is located towards the direction where the distal end is located, and a rounded corner is provided at the edge of the end near the distal end.

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