CN214967185U

CN214967185U - Implant fixing and holding structure in blood vessel and implant conveying system in blood vessel

Info

Publication number: CN214967185U
Application number: CN202120191368.6U
Authority: CN
Inventors: 贾晶; 张捷捷; 吴重草; 胡天宙; 刘振全; 孙冰
Original assignee: Jiangsu Nuanyang Medical Instruments Co ltd
Current assignee: Jiangsu Nuanyang Medical Instruments Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-12-03
Anticipated expiration: 2031-01-22

Abstract

The utility model provides a fixed retaining structure of implant in blood vessel and a blood vessel implant conveying system, the fixed retaining structure of implant in blood vessel is used for carrying out the fixing of implant, keeping and the separation action in the blood vessel implant transportation process. An endovascular implant delivery system comprising: the catheter comprises a delivery tube, a guide wire penetrating through the delivery tube, and a support connected to the guide wire. In the initial stage of delivery, the guide wire and the delivery pipe are kept relatively fixed, and the support is positioned at the head of the delivery pipe and plays a role in fixing the implant; in the later period of delivery, the guide wire and the delivery pipe are relatively moved, the support extends out of the head part of the delivery pipe, and the implant is released. When the length of the implant extending out of the far end of the conveying pipe does not exceed a certain value, the implant can be recovered to the position in the conveying pipe through the guide wire and released again. According to the utility model discloses, provide a flexibility good, success rate is high, have and withdraw repeatedly and release the function again, and can adapt to the endovascular implant conveying system of multiple microcatheter.

Description

Implant fixing and holding structure in blood vessel and implant conveying system in blood vessel

Technical Field

The present invention relates to medical equipment, and more particularly to an endovascular implant fixation retention structure, and an endovascular implant delivery system including the same.

Background

Problems with the prior art for delivery of endovascular implants include:

1) it is common in the surgical procedure that endovascular implants are inaccurately positioned in the vessel and not placed in the desired location by the physician, and it is therefore desirable to retrieve endovascular implants into the delivery tube before their final release, and to re-release them after adjustment of the position. In the prior art, the endovascular implant either cannot be recycled, or the recycling is difficult when the length of the released endovascular implant exceeds 50% of the total length of the endovascular implant; however, the degree that the release of the endovascular implant does not exceed 50% has no obvious effect on the doctor to judge whether the correct position is reached, and if the delivery system can realize 90% release of the endovascular implant, the endovascular implant can still be recovered, and the position of the endovascular implant is basically determined, so that whether the release is successful or not can be judged better.

2) Patent CN108260342A describes a releasable delivery system comprising a delivery pusher consisting of an elongate member and an endovascular implant engagement mechanism located on a distal portion of the elongate member, and an endovascular implant having a proximal loop. The release delivery system is primarily secured by a mesh structure that hooks over the tail of the endovascular implant in a manner that, during actual therapeutic delivery, may, with changing clinical circumstances, result in the potential for incomplete detachment of the release delivery system, resulting in a failure to detach the delivery pusher from the endovascular implant with the proximal loop. Moreover, the system can be used only by being matched with the endovascular implant with the proximal ring and the delivery sheath, and the demand on the endovascular implant is higher; also, the system requires the use of a delivery sheath of a particular inner diameter size to avoid separation of the endovascular implant from the delivery pusher during use, which imposes a high requirement on the size of the delivery cannula.

3) Prior art intravascular implant delivery systems typically require use with microcatheters of a particular inner diameter, such as 0.027 "inner diameter, with limited application.

Accordingly, the present invention provides new improvements and advantages in the field of delivery of endovascular implants: the utility model discloses a delivery system can realize that endovascular implant length of release surpasss endovascular implant overall length the endovascular implant when 95% retrieve many times, makes things convenient for more accurate location in the doctor operation process. Require lowly to endovascular implant structure, endovascular implant release is simple easy to operate, simultaneously the utility model discloses a conveying system requires lowly to little pipe internal diameter, is applicable to the little pipe of multiple model, and the internal diameter is greater than the little pipe of conveyer pipe and all can use, makes things convenient for the operation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fixed retaining structure of implant in blood vessel the in-process of delivery of implant in blood vessel is through fixing the fixing of supporter realization implant in the seal wire and conveying system, keeping and separating.

The utility model provides a retaining structure is fixed to implant in blood vessel, including fixing on the seal wire, and through the seal wire is in the supporter that the conveyer pipe distal end carried out the motion.

The utility model provides a fixed retaining structure of implant in blood vessel, the supporter and/or match through the size between the conveyer pipe, it is right the afterbody of implant in blood vessel is fixed and is kept, and through the seal wire goes on the propelling movement of implant in blood vessel.

During the pushing process, the endovascular implant can be retrieved into the delivery tube and released again through the guide wire when the protruding length of the endovascular implant out of the distal end of the delivery tube is within a certain ratio to the length of the endovascular implant, and the ratio is not more than 0.98. After the ratio is exceeded, the endovascular implant is released from the delivery tube to achieve release.

The utility model provides an implant delivery system in blood vessel including the implant fixed retaining structure in blood vessel as above, this delivery system comprises fixed supporter on conveyer pipe, seal wire and the seal wire.

The utility model provides a retaining structure is fixed to implant in blood vessel, the supporter at least part set up in inside the distal end of conveyer pipe.

According to some embodiments of the invention, the ratio of the maximum dimension of the cross-section of the support in a direction perpendicular to the guide wire to the inner diameter of the delivery tube is (0.1-10.0): 1.

preferably, when the inner diameter of the conveying pipe is 0.1-0.3mm, the ratio of the maximum dimension of the section of the support in the direction vertical to the guide wire to the inner diameter of the conveying pipe is (0.01-2): 1.

preferably, when the inner diameter of the conveying pipe is 0.3-0.6mm, the ratio of the maximum dimension of the section of the support in the direction vertical to the guide wire to the inner diameter of the conveying pipe is (0.1-5): 1.

preferably, when the inner diameter of the conveying pipe is 0.6-1.0mm, the ratio of the maximum dimension of the section of the support in the direction vertical to the guide wire to the inner diameter of the conveying pipe is (0.2-10): 1.

preferably, when the inner diameter of the delivery pipe is larger than 1.0mm, the ratio of the maximum dimension of the section of the support in the direction perpendicular to the guide wire to the inner diameter of the delivery pipe is (0.5-10): 1.

the utility model provides a fixed retaining structure of implant in blood vessel, when being in the transport configuration, the supporter with the axial overlap length of implant in blood vessel with the ratio of the axial extension length of supporter is (0.001 ~ 1): 1.

the utility model provides a fixed retaining structure of implant in blood vessel, when being in the transport configuration, the supporter with the axial overlap length of conveyer pipe with the ratio of the axial extension length of supporter is (0.001 ~ 1): 1.

the utility model provides an implant conveying system in blood vessel, which comprises a conveying pipe and a guide wire, wherein the implant conveying system in blood vessel comprises a fixing and maintaining structure of implant in blood vessel. A support is attached to the distal end of the guidewire.

The utility model provides an implant conveying system in blood vessel, the last development component identification element position that has the radiopaque material preparation of implant conveying system in blood vessel, the material includes but not limited to gold, platinum tungsten alloy, platinum iridium alloy or development nature polymer. For positional reference of the actual delivery position of the endovascular implant during delivery.

The utility model discloses the transport field of implant in the blood vessel provides new improvement and following advantage:

(1) the utility model discloses a delivery system can realize that endovascular implant length of release surpasss endovascular implant overall length the endovascular implant when 95% retrieve many times, makes things convenient for more accurate location in the doctor operation process.

(2) The utility model discloses a conveying system requires lowly to implant structure in the blood vessel. The prior art release delivery systems require a mesh or loop structure that hooks over the tail of the endovascular implant and therefore need to be used with endovascular implants having a proximal loop, arm member, or marker coil, etc., and a delivery sheath. The utility model discloses can only with pressure and frictional force for realizing fixing, keeping the effort that changes with the relative position between well endovascular implant and the conveying system, match the fixed and the keeping that realize endovascular implant through size and position between the three, do not produce other and collude and link, consequently need not endovascular implant and have special afterbody structure, be applicable to a plurality of endovascular implant including close net support, occluder, spring coil.

(3) The delivery system of the utility model releases the implant in the blood vessel, which is simple and easy to operate, the fixation, the maintenance and the relative position change are realized by the relative movement of the guide wire and the delivery pipe, and the direct manual operation can be realized without introducing an additional device, a channel, a thermally driven or electrically driven pusher; but simultaneously can also use with the cooperation of corresponding propelling movement appurtenance, has higher flexibility.

(4) The utility model discloses a conveying system requires lowly to little pipe internal diameter, and little pipe internal diameter is greater than the conveying pipe external diameter and all can use, makes things convenient for the doctor to select the model that is fit for the operation.

Drawings

Fig. 1 is a schematic longitudinal cross-sectional view of the present endovascular implant delivery system in a delivery configuration;

FIG. 2 is a corresponding relationship of the length of an endovascular implant extending out of the distal end of the delivery tube to the length of the endovascular implant;

FIG. 3 shows the correspondence between the inner diameter of the head of the transfer tube and the maximum outer diameter of the holder;

fig. 4 shows relative positioning of the implant retention structure during interaction with the implant, the system in an initial delivery stage in a delivery configuration;

fig. 5 is a relative positioning of the implant retention structure and the implant during actuation of the implant retention structure and the implant, with the system in a late delivery configuration;

fig. 6 is a relative position of the system in a release configuration during actuation of the endovascular implant fixation retention structure and the endovascular implant.

Wherein the reference numbers are as follows:

1-delivery tube, 2-guide wire, 3-endovascular implant, 201-support, 202-visualization element.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the following description of the present invention will be made in conjunction with fig. 1 to 6, and an implant delivery system for blood vessels including the same will be described in further detail. It should be noted that the drawings are simplified and have non-precise ratios, and are only used for convenience and clarity to assist in describing the embodiments of the present invention, and are not used for limiting the implementation of the present invention, so that the present invention has no technical essential significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed by the present invention can cover without affecting the function and the achievable purpose of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The present invention will be further described with reference to the following specific embodiments. It should be understood that the following examples are illustrative of the present invention only and are not intended to limit the scope of the present invention.

The delivery systems of the present disclosure may be used to deliver a variety of endovascular implants, such as various dense mesh stents, occluders, coils, or other implants. For convenience, a close-mesh stent schematic is illustrated in the figures.

The delivery tube of the present description is a lumen structure containing a circular, elliptical or polygonal internal lumen, and the term "delivery tube" is used throughout the description for convenience.

The micro-catheter in the present specification is a medical device which is matched with the delivery system to complete the delivery, withdrawal and release processes of the implant in the blood vessel in the process of operation, such as micro-catheters, guide catheters, middle catheters, access catheters and delivery sheaths with various sizes. The term "microcatheter" is used throughout the specification for convenience.

In this specification, the term "release" describes the process of separating the endovascular implant from the delivery system, and the term "withdrawal" describes the process of partially detaching the endovascular implant from the microcatheter, yet allowing it to be retrieved back into the microcatheter by the delivery system. The endovascular implant maintains a fixation, retention action with the delivery system before release, and can be withdrawn one or more times.

The pre-release configuration of the endovascular implant is referred to herein collectively as the "delivery configuration".

Because the implant in blood vessel usually has certain elasticity, the natural state and the holding state under the action of different external forces have different actual lengths. In the present description, reference to the length of an endovascular implant refers to the length of the implant when it is fully inside the delivery tube; when the endovascular implant extends out of the distal length of the delivery tube, it corresponds to the exact same length of endovascular implant when in the delivery tube.

Referring to fig. 1, the present invention provides an implant fixation and retention structure in a blood vessel, and an implant delivery system in a blood vessel including the implant fixation and retention structure in a blood vessel. The endovascular implant delivery system comprises a delivery tube 1 and a guide wire 2 for securing, retaining and detaching the endovascular implant 3. The implant fixing and holding structure in the blood vessel comprises a support 201, wherein the support 201 is fixed on a guide wire 2, is wholly or partially arranged in the lumen of a delivery pipe 1 and can move along with the guide wire 2 in the lumen of the delivery pipe 1.

The motion of the implant in blood vessel is realized by the relative position between the tail part and the holder and the delivery pipe. The tail part of the implant in the blood vessel is clamped by the support and the delivery pipe, and the implant in the blood vessel is fixed and kept through the matching of the size and the position of the three; meanwhile, the guide wire connected with the support can push the implant in the blood vessel, change the relative positions of the three and perform separation action. In the pushing process, the effect of pressure, friction or other interaction force exists between the implant in the blood vessel and the holder and/or the inner wall of the delivery pipe, and the acting force for realizing fixation, holding and relative position change among the implant in the blood vessel, the holder and/or the inner wall of the delivery pipe is realized; when the holder is extended from the distal end portion or all of the delivery tube, the interaction between the endovascular implant and the holder and/or the inner wall of the delivery tube is lost, the fixation between the three is lost, and the endovascular implant is separated from the delivery tube.

Or, in other schemes, the holder 201 is completely arranged outside the lumen of the delivery pipe 1, the endovascular implant 3 is sleeved on the holder 201, and the tail part of the endovascular implant 3 can be inserted into the lumen of the delivery pipe 1 according to actual needs:

when the tail part of the endovascular implant 3 does not extend into the lumen of the delivery pipe 1 at this time, the endovascular implant 3 and the holder 201 are fixed through size matching;

when the tail part of the endovascular implant 3 extends into the lumen of the delivery pipe 1 at this time, the endovascular implant 3, the holder 201 and the delivery pipe 1 are fixed by size matching.

According to the utility model discloses, when endovascular implant stretches out conveyer pipe distal end length and is no longer than certain numerical value, endovascular implant accessible seal wire is retrieved to the conveyer pipe in. The length of the endovascular implant is L, the endovascular implant can be retrieved through the guide wire when the endovascular implant extends out of the distal end of the delivery tube by a length not greater than 0.98L during the pushing process, and the tail of the endovascular implant loses the fixation with the holder and/or the inner wall of the delivery tube when the endovascular implant extends out of the distal end of the delivery tube by a length greater than 0.98L, the endovascular implant is separated from the holder and/or the delivery tube.

Referring to fig. 2, the extension length of the endovascular implant from the distal end of the delivery tube corresponds to the length of the endovascular implant for effective withdrawal. The length distribution in the interval can realize the withdrawing action of the implant in the blood vessel. The maximum ratio of the length of the endovascular implant extending out of the distal end of the delivery tube to the length of the endovascular implant increases with increasing length of the endovascular implant. When the endovascular implant has a shorter overall length, the corresponding maximum ratio is relatively small, and when the endovascular implant has a longer overall length, a higher maximum ratio can be achieved.

Preferably, when the total length of the endovascular implant is not more than 5mm, the endovascular implant capable of being recycled extends out of the distal end of the delivery pipe by a length of not more than 0.8L; when the total length of the endovascular implant exceeds 100mm, the length of the endovascular implant capable of being recovered, which extends out of the distal end of the delivery tube, can reach 0.98L.

Preferably, for a typical vascular implant within 5-100mm in length, the intravascular implant extends 0.8L-0.95L out of the distal end of the delivery tube for a suitable release profile.

According to a preferred embodiment of the present invention, the ratio of the maximum diameter of the cross section of the holder in the vertical direction to the guide wire in the natural non-crimped state to the inner diameter of the head of the duct is (0.1-10.0): 1. the correspondence between the inner diameter of the head of the duct and the maximum outer diameter of the holder is shown in connection with fig. 3. The holder, the guide wire and the implant in the blood vessel have certain volumes, and when the size of the delivery pipe is smaller, the proportion of the holder, the guide wire and the implant in the blood vessel to the inner diameter of the head of the delivery pipe is larger. In connection with a preferred embodiment of the invention, the preferred length combinations are represented by the arrays (A ', B'), where A 'represents the inner diameter of the head of the transport pipe and B' represents the maximum outer diameter of the holder, and the length is in millimeters (mm).

Preferably, when the inner diameter of the head of the delivery pipe is 0.1-0.3mm, the ratio of the maximum section size of the holder in the direction vertical to the guide wire to the inner diameter of the delivery pipe in the natural non-pressure holding state is (0.01-2): 1. preferred length combinations include (0.26, 0.33), (0.27, 0.21).

Preferably, when the inner diameter of the head of the delivery pipe is 0.3-0.6mm, the ratio of the maximum section size of the holder in the direction vertical to the guide wire to the inner diameter of the delivery pipe in the natural non-pressure holding state is (0.1-5): 1. preferred length combinations include (0.36, 0.53), (0.36, 0.6), (0.36, 0.77), (0.4, 0.37), (0.4, 0.44), (0.4, 0.58), (0.4, 0.66), (0.4, 0.83), (0.49, 0.42), (0.52, 0.41), (0.52, 0.44), (0.55, 0.53), (0.55, 0.78), (0.55, 0.88).

Preferably, when the inner diameter of the head of the delivery pipe is 0.6-1.0mm, the ratio of the maximum cross-sectional dimension of the holder in the direction perpendicular to the guide wire to the inner diameter of the delivery pipe in the natural non-pressure holding state is (0.2-10): 1. preferred length combinations include (0.61, 0.77), (0.62, 0.45), (0.7, 0.5), (0.7, 0.88), (0.7, 0.93), (0.8, 1.28), (0.82, 1.43), (1, 0.99).

Preferably, when the inner diameter of the head of the delivery tube is larger than 1.0mm, the ratio of the maximum cross-sectional dimension of the holder in the direction perpendicular to the guide wire to the inner diameter of the delivery tube in the natural non-crimping state is (0.5-10): 1. preferred length combinations include (1.2, 1.53), (1.2, 1.6), (1.5, 1.8) (1.6, 1.99).

According to the utility model discloses, when being in the transport configuration, the supporter with the axial overlap length of endovascular implant with the ratio of the axial extension length of supporter is (0.001 ~ 1): 1. preferably, the axial overlap length of the holder with the endovascular implant covers the holder as much as possible.

According to the utility model discloses, when being in under the transport configuration, the supporter with the axial overlap length of conveyer pipe with the ratio of the axial extension length of supporter is (0.001 ~ 1): 1. preferably, the holder covers the holder as much as possible of its axial overlap length with the duct.

In some preferred embodiments, the holder supports the inner wall of the endovascular implant with an outer portion or the entire portion of the endovascular implant against the inner wall of the delivery tube.

In other preferred embodiments, the holder extends through a mesh or other surface opening of the endovascular implant, and the outer profile of the holder conforms to the inner wall of the delivery tube.

The utility model provides an implant conveying system in blood vessel, implant conveying system in blood vessel includes conveyer pipe and seal wire.

According to some preferred embodiments of the present invention, the duct is an integrally formed structure.

According to other preferred embodiments of the present invention, the conveying pipe is a non-integral structure, and is a structure having an internal cavity formed by one or more of cutting, combining and weaving.

Preferably, the present invention may adopt a hypotube as the transport pipe. Further, the hypotube in this embodiment may be made of metal or polymer material, and preferably, the hypotube body is a cut metal spiral tube with a pitch gradually decreasing from the proximal end to the distal end, or a polymer material with a variable compliance; further, the metal material may be stainless steel, platinum-tungsten alloy, platinum-iridium alloy, nickel-titanium alloy or cobalt-chromium alloy, and the polymer material includes, but is not limited to, polyethylene, polyoxymethylene, polyurethane, polyester, polytetrafluoroethylene, fluorinated ethylene-propylene copolymer, polyamide, polyimide or nylon.

According to the present invention, the development element 202 having radiopaque material on the guide wire identifies the element location, the material comprising: gold, platinum-tungsten alloy, platinum-iridium alloy, or a developable polymer. Preferably, during the implementation of the present endovascular implant delivery system, the surgical operator can view the device's real-time position through the visualization element to determine whether the endovascular implant is in the correct position.

Referring to fig. 4-6, the present invention provides a fixing and retaining structure for an implant in blood vessel. According to this embodiment, during the initial delivery phase (fig. 4) of the endovascular implant, the guidewire remains fixed relative to the delivery tube, the holder is positioned within the head of the delivery tube and acts to hold the endovascular implant, and the holder provides pressure with its outer profile to hold the endovascular implant against the inner wall of the delivery tube, increasing the friction between the endovascular implant and the delivery tube and preventing the endovascular implant from backing out during pushing or withdrawal. In the later stage of delivery of the endovascular implant (fig. 5), relative movement of the guide wire and the delivery tube occurs, the support protruding from the head of the delivery tube, eventually reaching a release configuration (fig. 6), effecting release of the endovascular implant.

Preferably, the endovascular implant delivery system is used in conjunction with a microcatheter for endovascular implant delivery. Early in delivery, the delivery system anchors and delivers the endovascular implant down a microcatheter to near the point of release, and the microcatheter is subsequently withdrawn and further position adjusted by the delivery system until accurately positioned and released. Preferably, the selection of the micro-catheter does not affect the pushing, withdrawing and releasing actions of the implant in the blood vessel, and the implant in the blood vessel can still be driven to carry out position adjustment by the delivery system after the micro-catheter is withdrawn. Therefore, the intravascular implant delivery system of the present invention has no clear limitation on the range of the inner diameter and the outer diameter of the microcatheter used in cooperation with the intravascular implant delivery system, and can be selected more.

Preferably, the endovascular implant delivery system is applied by matching with a pushing structure, the endovascular implant pushing structure is connected with a guide wire, and the pushing, withdrawing and releasing of the endovascular implant can be realized by pushing the guide wire and changing the relative positions of the delivery pipe, the guide wire and the endovascular implant. Under the configuration of carrying, the relative position of conveyer pipe, seal wire and endovascular implant does not change, no matter be transport state or withdrawal state, endovascular implant all can not deviate from, endovascular implant can withdraw and relocate repeatedly before releasing, finally realize the accurate release of endovascular implant, improve the operation success rate by a wide margin, play the best treatment. In the release configuration, pushing the guide wire brings the position of the support and the delivery pipe to change, the support extends out of the head of the delivery pipe, and release of the endovascular implant is achieved.

According to the endovascular implant delivery system provided by the preferred embodiment, when the endovascular implant is in an unreleased state, the endovascular implant delivery system maintains the stability and flexibility of the system, and can be operated by the existing medical technical means; compare simultaneously and utilize the conveyor who carries after physical connection between subassembly and the endovascular implant, the utility model discloses a supporter and conveyer pipe are closely fixed endovascular implant and conveying system, are difficult to drop, also can conduct the conveying power more effectively. The intravascular implant delivery system can also realize accurate positioning of intravascular implant release, control the guide wire to position the intravascular implant to the release position, and accurately release the intravascular implant after the microcatheter is withdrawn; the position of the implant in the blood vessel can be still adjusted before the release until the release position of the implant in the blood vessel is determined to be accurate, so that the maximum success rate can be ensured.

In the description of the present application, it is to be understood that the positional or positional relationships indicated by the directional terms such as "proximal", distal, front, rear ", etc., are generally based on the positional or positional relationships shown in the drawings for the convenience of description and simplicity of description, and that, unless otherwise stated, these directional terms are not intended to indicate and imply that the referenced device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

What has been described above is only the preferred embodiment of the present invention, not for limiting the scope of the present invention, but various changes can be made to the above-mentioned embodiment of the present invention. All the simple and equivalent changes and modifications made according to the claims and the content of the specification of the present invention fall within the scope of the claims of the present invention. The present invention is not described in detail in the conventional technical content.

Claims

1. An endovascular implant fixation retention structure for fixation, retention, and detachment of an endovascular implant during delivery of the endovascular implant, comprising:

a holder fixed on the guide wire and moving at the far end of the conveying pipe through the guide wire;

the endovascular implant is L in length, a tail part of the endovascular implant at least partially covers the support, the support and/or the delivery pipe are matched in size, the tail part of the endovascular implant is fixed and held, and the endovascular implant is pushed through the guide wire;

when the protrusion length of the endovascular implant out of the distal end of the delivery tube is not more than 0.98L during the pushing process, the endovascular implant can be retrieved through the guide wire,

when the protrusion length of the endovascular implant from the distal end of the delivery tube is greater than 0.98L, the tail of the endovascular implant loses fixation with the holder and/or the inner wall of the delivery tube, and the endovascular implant is detached from the holder and/or the delivery tube.

2. An endovascular implant fixation retention structure according to claim 1, wherein the holder is at least partially disposed within a distal end of the delivery tube.

3. An endovascular implant fixation retention structure according to claim 1 or 2, wherein the holder has a cross-sectional maximum dimension perpendicular to the guidewire in a ratio to the inner diameter of the delivery tube of (0.1-10.0): 1.

4. an endovascular implant fixation retention structure according to claim 3, wherein, at an inner diameter of the delivery tube of 0.1-0.3mm, a ratio of a maximum dimension of a cross-section of the holder in a direction perpendicular to the guide wire to the inner diameter of the delivery tube is (0.01-2): 1.

5. an endovascular implant fixation retention structure according to claim 3, wherein, at an inner diameter of the delivery tube of 0.3-0.6mm, a ratio of a maximum dimension of a cross-section of the holder in a direction perpendicular to the guide wire to the inner diameter of the delivery tube is (0.1-5): 1.

6. an endovascular implant fixation retention structure according to claim 3, wherein, at an inner diameter of the delivery tube of 0.6-1.0mm, a ratio of a maximum dimension of a cross-section of the holder in a direction perpendicular to the guide wire to the inner diameter of the delivery tube is (0.2-10): 1.

7. an endovascular implant fixation retention structure according to claim 3, wherein, when the delivery tube inner diameter is greater than 1.0mm, the ratio of the maximum dimension of the holder in cross-section perpendicular to the guidewire to the inner diameter of the delivery tube is (0.5-10): 1.

8. an endovascular implant fixation retention structure according to claim 1 or 2, wherein, in a delivery configuration of the endovascular implant fixation retention structure, a ratio of an axial overlap length of the holder with the endovascular implant to an axial extension length of the holder is (0.001-1): 1.

9. an endovascular implant fixation retention structure according to claim 1 or 2, wherein, in a delivery configuration, the ratio of the axial overlap length of the holder with the delivery tube to the axial extension length of the holder is (0.001-1): 1.

10. an endovascular implant delivery system comprising an endovascular implant fixation retention structure according to any one of claims 1-9, wherein the endovascular implant delivery system comprises:

a delivery pipe;

a guide wire disposed within the delivery tube, a distal end of the guide wire having the holder attached thereto.

11. The endovascular implant delivery system of claim 10, having a visualization element thereon for positional reference of an actual delivery position of the endovascular implant during delivery.