An implant delivery system

Abstract

The utility model relates to an implant delivery system especially, including: push main pipe has push pipe cavity, push sub -pipe, one end is connected with push main pipe near one end of far -end through connecting spring, push sub -pipe has push sub -cavity, limiting piece is located in push sub -cavity, and with push sub -cavity inner wall connection, limiting piece has spacing, release silk, one end is in order to push pipe cavity, connecting spring's inner chamber, push sub -cavity is located in spacing, the other end is connected in push main pipe near one end of near -end through fixing piece. When delivering implant, the tail ring of implant is located in push sub -cavity, and one end of release silk is in order to push pipe cavity, connecting spring's inner chamber, push sub -cavity is located in spacing, and one end of release silk is located in the positioning gap in the release of implant through the fixed device.

Description

Technical Field

[0001] This utility model relates to the field of aneurysm embolization device delivery technology, and in particular to an implant delivery system. Background Technology

[0002] Intracranial aneurysms are among the most common and life-threatening diseases of the neurovascular system, characterized by a localized abnormal bulging of the cerebral blood vessel wall, forming a sac-like structure. Aneurysm rupture is its most serious complication, leading to subarachnoid hemorrhage with extremely high mortality and disability rates. Currently, interventional embolization has become the main treatment for intracranial aneurysms. Among these, coil embolization is widely used clinically due to its minimally invasive nature and rapid recovery. This technique uses a microcatheter to precisely deliver a releaseable coil into the aneurysm cavity, achieving occlusion of the aneurysm cavity through mechanical filling and induced thrombus formation, thereby preventing aneurysm rupture. However, precise control of coil release remains a key technical challenge affecting the success rate of the procedure and patient prognosis.

[0003] The main methods for releasing coils include hydrolysis, electrolysis, and mechanical release. Hydrolysis involves injecting a specific solvent into the delivery catheter to dissolve the connection between the coil and the push rod, thus releasing the coil. However, this method is difficult to control precisely, and the solvent must also return through the vascular system, making it susceptible to the influence of vascular anatomy (such as tortuosity or branching), leading to prolonged release time or incomplete release, increasing surgical risks. Electrolysis utilizes the thermal effect generated by an electric current passing through the connection point to melt or contract the metal solder joint, thereby separating the coil. This technique may suffer from uneven heating at the solder joint, potentially causing localized overheating and electrical burns to the vessel wall, requiring extensive experience and skill from the operator.

[0004] Mechanical release technology uses precise mechanical structures to achieve the physical connection and separation between the spring coil and the delivery system. Compared to hydrolysis and point release, mechanical release has become the mainstream release method in clinical applications due to its advantages such as controllability, immediacy, and safety. Utility Model Content

[0005] In order to solve or at least partially solve the above-mentioned technical problems, the present invention provides an implant delivery system.

[0006] This invention provides an implant delivery system, comprising a main delivery tube, a sub-delivery tube, a limiting member, and a release wire. The main delivery tube has a delivery cavity; one end of the sub-delivery tube is connected to the distal end of the main delivery tube via a connecting spring; the sub-delivery tube has a sub-cavity; the limiting member is disposed within the sub-cavity and connected to the inner wall of the sub-delivery tube; the limiting member has a limiting space; one end of the release wire passes sequentially through the delivery cavity, the inner cavity of the connecting spring, and the sub-cavity to the limiting space, and the other end of the release wire is connected to the proximal end of the main delivery tube via a fixing member; during implant delivery, the tail ring of the implant is disposed within the sub-cavity, and one end of the release wire passes sequentially through the delivery cavity, the inner cavity of the connecting spring, and the sub-cavity to the limiting space; the end of the release wire located within the positioning gap is pulled out by the fixing member to release the implant.

[0007] Optionally, the limiting member includes a limiting straight wire, the two ends of which are respectively connected to the inner wall of the push tube, and the middle part of the limiting straight wire is wound into an annular hole, the annular hole having the limiting space.

[0008] Optionally, the limiting member includes a set of limiting straight wires, which includes two parallel limiting straight wires, and the limiting space is formed between the two limiting straight wires.

[0009] Optionally, the limiting component includes multiple sets of limiting straight wires; each set of limiting straight wires includes two parallel limiting straight wires, and the limiting space is formed between the two limiting straight wires; the multiple sets of limiting straight wires are arranged sequentially at intervals along the length direction of the push tube, and adjacent sets of limiting straight wires are arranged perpendicular to each other.

[0010] Optionally, the limiting straight wire has a flexible segment arranged in a spiral shape.

[0011] Optionally, the limiting component includes a limiting wire, which has a spiral structure; both ends of the limiting wire are connected to the inner wall of the push tube, and the axial direction of the limiting wire is perpendicular to the axial direction of the push tube; the gap or internal space of the limiting wire is a limiting space.

[0012] Optionally, the limiting member includes a limiting wire, which has a flexible section and a straight section arranged in a spiral or variable diameter spiral shape. The flexible section is arranged coaxially with the push tube, and the two ends of the flexible section are respectively connected to the inner wall of the push tube through a straight line segment. The gap or internal space of the limiting wire is a limiting space.

[0013] Optionally, the limiting component includes a limiting wire, which has a variable diameter spiral structure and is coaxially arranged with the push tube; the end of the limiting wire with a larger diameter is connected to the inner wall of the push tube; the gap or internal space of the limiting wire is a limiting space.

[0014] Optionally, the limiting component includes a limiting wire, which has a variable diameter spiral structure on the first plane and is coaxially arranged with the pusher tube; the end of the limiting wire with a larger diameter is connected to the inner wall of the pusher tube; the gap of the limiting wire is a limiting space.

[0015] Optionally, the diameter of the release wire at the distal end gradually decreases and then gradually increases from the proximal end to the distal end; the edge of the release wire at the distal end is rounded.

[0016] Compared to existing technologies, in this embodiment, by threading the tail loop of the implant through the distal end of the release wire and the limiting space of the limiting member to limit the implant, this simple mechanical mechanism not only facilitates the delivery of the implant but also facilitates its subsequent release. When the implant needs to be released, simply pull out the release wire, and the tail loop of the implant will be freed from the restriction of the release wire, allowing for release. This embodiment not only further simplifies the operation during the implant release process but also improves the stability of the implant during release. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the relevant drawings will be briefly described below. It should be understood that the drawings described below are only for illustrating some embodiments of this utility model, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0018] Figure 1 This is a cross-sectional schematic diagram of one embodiment of an implant delivery system according to the present invention;

[0019] Figure 2 yes Figure 1 Enlarged view of part A;

[0020] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting straight wire of an implant delivery system according to this utility model. Figure 1 ;

[0021] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting straight wire of an implant delivery system according to this utility model. Figure 2 ;

[0022] Figure 5 This is a top view schematic diagram of an embodiment of the push tube and limiting straight wire of an implant delivery system according to this utility model. Figure 1 ;

[0023] Figure 6 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting straight wire of an implant delivery system according to this utility model. Figure 3 ;

[0024] Figure 7 This is a top view schematic diagram of an embodiment of the push tube and limiting straight wire of an implant delivery system according to this utility model. Figure 2 ;

[0025] Figure 8 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 1 ;

[0026] Figure 9 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 2 ;

[0027] Figure 10 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 3 ;

[0028] Figure 11 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 4 ;

[0029] Figure 12 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 5 ;

[0030] Figure 13 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 6 ;

[0031] Figure 14 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 7 ;

[0032] Figure 15 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model. Figure 8 ;

[0033] Figure 16 This is a cross-sectional schematic diagram of an embodiment of the push tube and limiting wire of an implant delivery system according to this utility model;

[0034] Figure 17 This is a partial schematic diagram of one embodiment of the release wire of an implant delivery system according to the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Pushing main tube; 11. Pushing cavity; 2. Pushing sub-tube; 21. Pushing sub-cavity; 3. Connecting spring; 41. Limiting straight wire; 42. Annular hole; 43. Annular hole; 44. Flexible section; 45. Gap; 46. Internal space; 47. Limiting wire; 48. Straight section; 51. Release wire; 52. Groove; 53. Implant; 54. Tail ring; 55. Fixing component; 56. Fixing groove. Detailed Implementation

[0037] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0038] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0039] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0040] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0041] Unless otherwise stated, the term "multiple" means two or more, and "multiple groups" means two or more groups.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0043] In this invention, the distal end refers to the end furthest from the surgeon during surgery, and the proximal end refers to the end closest to the surgeon during surgery. The implant includes a stent or an aneurysm embolization device. Existing implants can be used, and existing implants have a tail ring at the proximal end.

[0044] The inventors discovered that existing mechanical release structures employ relatively complex mechanical structures, which leads to cumbersome operation and poor release stability during the implant release process.

[0045] In view of this, the inventor of this utility model provides an implant delivery system to solve the above-mentioned problems. Several specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0046] First Embodiment

[0047] The implant delivery system mentioned in this embodiment, such as Figures 1 to 3 As shown, the implant delivery system includes a main push tube 1, a sub-push tube 2, a connecting spring 3, a limiting member, and a release wire 51. The main push tube 1 is connected to the sub-push tube 2 via the connecting spring 3. Specifically, the distal end of the main push tube 1 is connected to the proximal end of the connecting spring 3, and the proximal end of the sub-push tube 2 is connected to the distal end of the connecting spring 3. The main push tube 1 has a push cavity 11 inside, and the sub-push tube 2 has a push cavity 21 inside. The main push tube 1, the connecting spring 3, and the sub-push tube 2 are coaxially arranged, and the push cavity 11 of the main push tube 1 communicates with the push cavity 21 of the sub-push tube 2 through the inner cavity of the connecting spring 3. The limiting member is disposed within the push cavity 21 of the sub-push tube 2.

[0048] In this embodiment, the structural design scheme of the limiting member is as follows:

[0049] Optional, such as Figure 3As shown, the limiting component includes a limiting straight wire 41. An annular hole portion 42, forming a ring hole structure, is wound around the middle of the limiting straight wire 41. The annular hole 43 of the annular hole portion 42 is coaxially aligned with the push tube 2, and the annular hole 43 can be considered as a limiting space. The intersections where the limiting straight wire 41 is wound into the annular hole portion 42 are connected, and the annular hole 43 of the annular hole portion 42 is fixed to prevent changes in the annular hole portion 42. The connection at the intersections can be performed using laser welding technology commonly used in the art. The two ends of the limiting straight wire 41 are respectively connected to the inner wall of the push tube 2, and the limiting straight wire 41 is located on both sides of the annular hole portion 42.

[0050] Optional, such as Figure 3 , Figure 4 As shown, based on the above-mentioned optional technical solutions, the structure of the limiting straight wire 41 is further improved. The limiting straight wire 41 has a flexible segment 44, which is spirally arranged. The axis of the flexible segment 44 is perpendicular to the axis of the push tube 2, and the flexible segment 44 is located between the annular hole 42 and the inner wall of the push tube 2. By providing a spiral flexible segment 44 on the limiting straight wire 41, the limiting straight wire 41 can have elastic deformation, so that the connection between the release wire 51 and the limiting straight wire 41 is changed to a flexible connection. When the release wire 51 is pulled out, the flexible segment 44 of the release wire 51 moves towards the proximal end and undergoes elastic deformation. The elastic deformation of the flexible segment 44 can reduce the risk of the limiting straight wire 41 breaking when the release wire 51 is pulled out.

[0051] Either of the two technical solutions mentioned above can be chosen.

[0052] The exemplary usage process disclosed in this embodiment is as follows:

[0053] like Figures 1 to 4As shown, when delivering the implant 53, the tail ring 54 of the implant 53 is first bent towards one side of the implant 53 along its length. Then, the tail ring 54 of the implant 53 is placed in the push chamber 21 of the push tube 2, with the tail ring 54 of the implant 53 located at the end of the annular hole 42 near the proximal end. Next, one end of the release wire 51 is sequentially passed through the push chamber 11 of the push main tube 1, the inner cavity of the connecting spring 3, the push chamber 21 of the push tube 2, the tail ring 54 of the implant 53, and the annular hole 43 of the limiting member, thus fixing the implant 53. The other end of the release wire 51 is placed in the fixing groove 56 of the fixing member 55. The fixing member 55 is snapped and fixed to the end of the push main tube 1 near the proximal end, with the end of the push main tube 1 near the proximal end located in the fixing groove 56 of the fixing member 55, thus completing the connection between the fixing member 55 and the push main tube 1. When the implant 53 is delivered into the aneurysm, the surgeon only needs to remove the fixation piece 55 from the push tube 1. The fixation piece 55 moves the release wire 51 proximally. When the end of the release wire 51 that passes through the annular hole 43 is withdrawn, it passes sequentially through the tail ring 54 of the implant 53, the push chamber 21 of the push tube 2, the inner cavity of the connecting spring 3, and the push chamber 11 of the push tube 1. When the end of the release wire 51 that passes through the annular hole 43 passes through the tail ring 54 of the implant 53, the tail ring 54 of the implant 53 loses the restraint of the release wire 51, and the implant 53 begins to release and deform.

[0054] Compared to existing technologies, in this embodiment, by threading the distal end of the release wire 51 through the tail ring 54 of the implant 53 and the limiting space of the limiting member to limit the implant 53, this simple mechanical mechanism not only facilitates the delivery of the implant 53 but also facilitates its subsequent release. When the implant 53 needs to be released, simply pull out the release wire 51, and the tail ring 54 of the implant 53 will be released without the restriction of the release wire 51. This embodiment not only further simplifies the operation of the implant 53 during the release process but also improves the stability of the implant 53 during release.

[0055] Second Embodiment

[0056] This embodiment also proposes an implant delivery system. The second embodiment is a parallel technical solution to the first embodiment, with the main improvement being the structure of the limiting member, as detailed below:

[0057] Optional, such as Figure 2 , Figure 5As shown, the limiting component includes a set of limiting straight wires 41. This set of limiting straight wires 41 includes two limiting straight wires 41. The two ends of these two limiting straight wires 41 are respectively connected to the inner wall of the push tube 2. These two limiting straight wires 41 are arranged in parallel, and a gap 45 is formed between them. This gap 45 allows the release wire 51 to pass through, so this gap 45 can be regarded as the limiting space of the limiting component. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent toward one side of the implant 53 along its length direction. Then, the tail ring 54 of the implant 53 is placed in the push cavity 21 of the push tube 2, and the tail ring 54 of the implant 53 is located at the end of the gap 45 near the proximal end. Then, one end of the release wire 51 is sequentially passed through the push tube cavity 11 of the push tube 1, the inner cavity of the connecting spring 3, the push tube cavity 21 of the push tube 2, the tail ring 54 of the implant 53, and the gap 45 of the limiting member. The other end of the release wire 51 is set at the end of the push tube 1 near the proximal end through the fixing member 55, thus achieving the fixation of the implant 53.

[0058] Optional, such as Figure 6 , Figure 7 As shown, the limiting component includes multiple sets of limiting straight wires 41. For ease of introduction, two sets of limiting straight wires 41 are used as an example. These two sets of limiting straight wires 41 are arranged alternately along the length of the push tube 2. The two sets of limiting straight wires 41 are arranged in a cross shape, that is, the two adjacent sets of limiting straight wires 41 are arranged perpendicular to each other. In the set of limiting straight wires 41 located near the far end, this set of limiting straight wires 41 includes two limiting straight wires 41. The two ends of these two limiting straight wires 41 are respectively connected to the inner wall of the push tube 2. These two limiting straight wires 41 are arranged in parallel, and a gap 45 is formed between these two limiting straight wires 41. This gap 45 allows the release wire 51 to pass through, so this gap 45 can be regarded as the limiting space of the limiting component. In a set of limiting straight wires 41 located near the proximal end, this set of limiting straight wires 41 includes two limiting straight wires 41. The two ends of these two limiting straight wires 41 are respectively connected to the inner wall of the push tube 2. These two limiting straight wires 41 are arranged in parallel, and a gap 45 is formed between them. This gap 45 allows the release wire 51 to pass through; therefore, this gap 45 can be considered as the limiting space of the limiting component. Of course, in Figure 7It can be observed that there is a spatial overlap area between the gaps 45 of the two sets of limiting straight wires 41. This spatial overlap area can be regarded as the limiting space of the limiting component. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent towards one side of the implant 53 along its length direction. Then, the tail ring 54 of the implant 53 is placed in the push cavity 21 of the push tube 2, and the tail ring 54 of the implant 53 is located between the two sets of limiting straight wires 41. Then, one end of the release wire 51 is sequentially passed through the push cavity 11 of the push tube 1, the inner cavity of the connecting spring 3, the push cavity 21 of the push tube 2, the gap 45 of one set of limiting straight wires 41, the tail ring 54 of the implant 53, and the gap 45 of the other set of limiting straight wires 41. The other end of the release wire 51 is set at the end of the push tube 1 near the proximal end through the fixing component 55. In this way, the implant 53 is fixed.

[0059] Optional, such as Figure 5 , Figure 7 As shown, based on either of the two optional technical solutions mentioned above, the structure of each set of limiting straight wires 41 is further improved. In each set of limiting straight wires 41, at least one limiting straight wire 41 has a flexible segment 44, which is spirally arranged. The axis of the flexible segment 44 is perpendicular to the axis of the push tube 2, and the flexible segment 44 is located between the middle and one end of the limiting straight wire 41. By providing a spirally arranged flexible segment 44 on the limiting straight wire 41, at least one of the limiting straight wires 41 in this set can have elastic deformation. When the release wire 51 is pulled out, the flexible segment 44 of the release wire 51 moves towards the proximal end and undergoes elastic deformation. The elastic deformation of the flexible segment 44 can reduce the risk of the limiting straight wire 41 breaking when the release wire 51 is pulled out.

[0060] You may choose any one of the three technical solutions mentioned above.

[0061] Compared to the first embodiment, the change lies in the structure, achieving the same technical effect. In this embodiment, by threading the distal end of the release wire 51 through the tail ring 54 of the implant 53 and the limiting space of the limiting member to limit the implant 53, a simple mechanical mechanism is achieved. This not only facilitates the delivery of the implant 53 but also facilitates its subsequent release. When the implant 53 needs to be released, simply pull out the release wire 51; the tail ring 54 of the implant 53, no longer restricted by the release wire 51, can then be released. This embodiment not only further simplifies the operation of the implant 53 during the release process but also improves the stability of the implant 53 during release.

[0062] Third Embodiment

[0063] This embodiment also proposes an implant delivery system. The third embodiment is a parallel technical solution to the first or second embodiment, with the main improvement being the structure of the limiting member, as detailed below:

[0064] Optional, such as Figure 8 , Figure 9 As shown, the limiting component includes a limiting wire 47, which has a helical structure. Both ends of the limiting wire 47 are connected to the inner wall of the push tube 2. The axis of the helical limiting wire 47 is perpendicular to the axis of the push tube 2. The internal space 46 of the helical limiting wire 47 can be considered as the limiting space of the limiting component, i.e., as shown... Figure 8 As shown. Of course, the gap 45 of the spiral-shaped limiting wire 47 can also be regarded as the limiting space of the limiting member, that is, as... Figure 9 As shown. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent towards one side of the implant 53 along its length. Then, the tail ring 54 of the implant 53 is placed in the push chamber 21 of the push tube 2, with the tail ring 54 of the implant 53 located at the proximal end of the spiral-shaped limiting wire 47. Next, one end of the release wire 51 is sequentially passed through the push chamber 11 of the push main tube 1, the inner cavity of the connecting spring 3, the push chamber 21 of the push tube 2, the tail ring 54 of the implant 53, and the gap 45 of the limiting member. The other end of the release wire 51 is placed at the proximal end of the push main tube 1 via the fixing member 55, thus fixing the implant 53. Of course, when one end of the release wire 51 passes through the gap 45 of the limiting member, it can also enter the internal space 46 of the limiting member.

[0065] Optional, such as Figure 10 , Figure 11 As shown, the limiting component includes a limiting wire 47, which comprises a flexible segment 44 and a straight segment 48. The flexible segment 44 has a spiral structure and is coaxially arranged with the push tube 2. The internal space 46 of the spiral-shaped limiting wire 47 can be regarded as the limiting space of the limiting component, i.e., as shown... Figure 10 As shown. Of course, the gap 45 of the spiral-shaped limiting wire 47 can also be regarded as the limiting space of the limiting member, that is, as... Figure 11As shown. The end of the flexible segment 44 near the distal end is connected to one end of a straight segment 48, and the other end of the straight segment 48 is connected to the inner wall of one side of the push tube 2. The end of the flexible segment 44 near the proximal end is connected to one end of another straight segment 48, and the other end of the straight segment 48 is connected to the inner wall of the other side of the push tube 2. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent towards one side of the implant 53 along its length direction, and then the tail ring 54 of the implant 53 is placed in the push cavity 21 of the push tube 2, with the tail ring 54 of the implant 53 located in the inner space 46 of the spiral-shaped limiting wire 47 near the proximal end. Then, one end of the release wire 51 is sequentially passed through the push tube cavity 11 of the push main tube 1, the inner cavity of the connecting spring 3, the push sub-cavity 21 of the push sub-tube 2, the tail ring 54 of the implant 53, and the internal space 46 of the limiting member. The other end of the release wire 51 is set at the end of the push main tube 1 near the proximal end through the fixing member 55, thus achieving the fixation of the implant 53. Of course, when one end of the release wire 51 is passed through the internal space 46 of the limiting member, it can also be passed through the gap 45 of the limiting member.

[0066] Optional, such as Figure 11 , Figure 12 As shown, the limiting component includes a limiting wire 47, which comprises a flexible segment 44 and a straight segment 48. The flexible segment 44 has a variable-diameter spiral structure, with the diameter of the end of the flexible segment 44 near the proximal end being smaller than the diameter of the end near the distal end. The flexible segment 44 is coaxially arranged with the push tube 2. The internal space 46 of the limiting wire 47 with its variable-diameter spiral structure can be considered as the limiting space of the limiting component. Similarly, the gap 45 of the limiting wire 47 with its variable-diameter spiral structure can also be considered as the limiting space of the limiting component. The distal end of the flexible segment 44 is connected to one end of the straight segment 48, and the other end of the straight segment 48 is connected to the inner wall of one side of the push tube 2. The proximal end of the flexible segment 44 is connected to one end of another straight segment 48, and the other end of the straight segment 48 is connected to the inner wall of the other side of the push tube 2.

[0067] Optional, such as Figure 13 , Figure 14 As shown, the limiting component includes a limiting wire 47, which has a variable diameter spiral structure. The diameter of the end of the limiting wire 47 near the proximal end is smaller than the diameter of the end near the distal end, and the limiting wire 47 is coaxially arranged with the push tube 2. The internal space 46 of the limiting wire 47 with its variable diameter spiral structure can be regarded as the limiting space of the limiting component, i.e., as shown... Figure 13 As shown. Of course, the gap 45 of the limiting wire 47, which has a variable diameter spiral structure, can also be regarded as the limiting space of the limiting member, that is, as... Figure 14As shown. The larger diameter end of the limiting wire 47 is connected to the inner wall of the push tube 2 on one side, and the smaller diameter end of the limiting wire 47 is wound into an annular hole 42. The annular hole 43 of the annular hole 42 is coaxially arranged with the push tube 2, and the annular hole 43 of the annular hole 42 can also be regarded as a limiting space. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent toward one side of the implant 53 along its length direction, and then the tail ring 54 of the implant 53 is placed in the push tube cavity 21 of the push tube 2, and the tail ring 54 of the implant 53 is located at the proximal end of the annular hole 43 of the limiting wire 47, which has a variable diameter spiral structure. Then, one end of the release wire 51 is sequentially passed through the push tube cavity 11 of the push main tube 1, the inner cavity of the connecting spring 3, the push sub-cavity 21 of the push sub-tube 2, the tail ring 54 of the implant 53, and the annular hole 43 of the limiting member. The other end of the release wire 51 is set at the end of the push main tube 1 near the proximal end through the fixing member 55, thus achieving the fixation of the implant 53. Of course, when one end of the release wire 51 is passed through the annular hole 43 of the limiting member, it can also pass through the internal space 46 or the gap 45 of the limiting member.

[0068] Optional, such as Figure 15 , Figure 16 As shown, a horizontal plane parallel to the end face of the pusher tube 2 near its far end is the first plane, i.e. Figure 15The dashed line represents the first plane. The limiting component includes a limiting wire 47, which has a variable diameter spiral structure on the first plane. Specifically, in the preparation of this technical solution, the limiting wire 47 is first made into a variable diameter spiral structure. Then, the variable diameter spiral limiting wire 47 is compressed along the axial direction of the push tube 2, so that its entire structure is on the first horizontal plane with a height of 0. This results in the limiting wire 47 having a variable diameter spiral structure on the first plane. The outer end of the limiting wire 47 is connected to the inner wall of the push tube 2, and the inner end of the limiting wire 47 is wound into an annular hole portion 42. The annular hole 43 of the annular hole portion 42 is coaxially arranged with the push tube 2, and the annular hole 43 of the annular hole portion 42 can also be regarded as a limiting space. Of course, the gap 45 between the limiting wires 47 can also be regarded as the limiting space of the limiting component. When delivering the implant 53, the tail ring 54 of the implant 53 is first bent towards one side of the implant 53 along its length. Then, the tail ring 54 of the implant 53 is placed in the push chamber 21 of the push tube 2, with the tail ring 54 of the implant 53 located near the proximal end of the annular hole 43 of the limiting wire 47, which has a variable diameter spiral structure. Next, one end of the release wire 51 is sequentially passed through the push chamber 11 of the push main tube 1, the inner cavity of the connecting spring 3, the push chamber 21 of the push tube 2, the tail ring 54 of the implant 53, and the annular hole 43 of the limiting member. The other end of the release wire 51 is placed near the proximal end of the push main tube 1 by the fixing member 55, thus fixing the implant 53. Of course, when one end of the release wire 51 passes through the annular hole 43 of the limiting member, it can also pass through the gap 45 of the limiting member.

[0069] In this embodiment, by setting the limiting member as a spiral structure or a variable diameter spiral structure, the limiting member has an elastic deformation. During the extraction of the release wire 51, the limiting member moves towards the proximal end and undergoes elastic deformation. By allowing the limiting member to undergo elastic deformation, the risk of the limiting member breaking when the release wire 51 is extracted can be reduced.

[0070] Fourth embodiment

[0071] This embodiment also proposes an implant delivery system. The fourth embodiment is a further improvement on any of the first to third embodiments, with the main improvement being the structure of the release wire 51, as detailed below:

[0072] Optionally, the diameter of the release wire 51 is 0.03mm to 0.1mm. This setting can ensure that the structural strength of the release wire 51 can limit the tail ring 54 of the implant 53.

[0073] Optional, such as Figure 17As shown, based on the above scheme, the structure of one end of the release wire 51 is further improved. Specifically, the wire diameter of the end of the release wire 51 near the distal end gradually decreases and then gradually increases to the original wire diameter of the release wire 51 from the proximal end to the distal end. This arrangement allows a groove 52 to be formed at the end of the release wire 51 near the distal end. When the end of the release wire 51 near the distal end enters the limiting space of the limiting member, and the limiting member is located in the groove 52, the release wire 51 is fixed. The edge of the end of the release wire 51 near the distal end is rounded, which makes it easier for the release wire 51 to enter the limiting space of the limiting member.

[0074] Either of the two optional technical solutions mentioned above can be chosen.

[0075] Finally, it should be noted that those skilled in the art will understand that many technical details have been presented in the embodiments of this utility model to facilitate a better understanding 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 the claims of this utility model can be substantially achieved. Therefore, in practical applications, various changes can be made to the above embodiments in form and detail without departing from the spirit and scope of this utility model.

Claims

1. An implant delivery system, characterized by, include: The push supervisor has a push chamber; The pusher sub-tube is connected at one end to the end of the pusher main tube near the distal end via a connecting spring; the pusher sub-tube has a pusher cavity. A limiting member is disposed within the pusher sub-cavity and connected to the inner wall of the pusher sub-tube; the limiting member has a limiting space; The release wire has one end sequentially threaded through the push tube, the inner cavity of the connecting spring, and the push sub-cavity into the limiting space, and the other end is connected to the end of the push main tube near the proximal end by a fixing member; When delivering the implant, the tail ring of the implant is placed in the pusher sub-cavity, and one end of the release wire passes through the pusher cavity, the inner cavity of the connecting spring, and the pusher sub-cavity to the limiting space in sequence. The implant is released by pulling out one end of the release wire located in the positioning gap using a fixator.

2. The implant delivery system of claim 1, wherein, The limiting component includes: The limiting straight wire has its two ends connected to the inner wall of the push tube, and the middle part of the limiting straight wire is wound into an annular hole, which has the limiting space.

3. The implant delivery system of claim 1, wherein, The limiting component includes a set of limiting straight wires, which includes: Two parallel limiting straight wires form the limiting space between the two limiting straight wires.

4. The implant delivery system of claim 1, wherein, The limiting component includes multiple sets of limiting straight wires; Each set of limiting straight wires includes two parallel limiting straight wires, and the limiting space is formed between the two limiting straight wires; Multiple sets of limiting straight wires are arranged sequentially at intervals along the length of the push tube, and adjacent sets of limiting straight wires are arranged perpendicular to each other.

5. The implant delivery system according to any one of claims 2 to 4, characterized in that, The limiting straight wire has a flexible section arranged in a spiral shape.

6. The implant delivery system of claim 1, wherein, The limiting component includes: The limiting wire has a spiral structure; both ends of the limiting wire are connected to the inner wall of the push tube, and the axial direction of the limiting wire is perpendicular to the axial direction of the push tube; the gap or internal space of the limiting wire is the limiting space.

7. The implant delivery system of claim 1, wherein, The limiting component includes: The limiting wire has a flexible section and a straight section arranged in a spiral or variable diameter spiral shape. The flexible section is arranged coaxially with the push tube, and the two ends of the flexible section are respectively connected to the inner wall of the push tube through a straight line segment. The gap or internal space of the limiting wire is a limiting space.

8. The implant delivery system according to claim 1, characterized in that, The limiting component includes: The limiting wire has a variable diameter spiral structure and is coaxially arranged with the push tube; the end of the limiting wire with a larger diameter is connected to the inner wall of the push tube; the gap or internal space of the limiting wire is the limiting space.

9. The implant delivery system according to claim 1, characterized in that, The limiting component includes: The limiting wire has a variable diameter spiral structure on the first plane, and the limiting wire is coaxial with the pusher tube; the end of the limiting wire with a larger diameter is connected to the inner wall of the pusher tube; the gap of the limiting wire is the limiting space.

10. The implant delivery system according to claim 1, characterized in that, The diameter of the unwinding thread at the distal end gradually decreases and then gradually increases from the proximal end to the distal end; the edge of the unwinding thread near the distal end has a rounded corner.

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