CN219983150U

CN219983150U - Pushing assembly and transvascular implant delivery device

Info

Publication number: CN219983150U
Application number: CN202320439520.7U
Authority: CN
Inventors: 曾世强; 张缝廉; 喻欣; 曾延华; 李韵玲; 张龙燕; 张志杰; 鹿鹏飞
Original assignee: Beijing Puyi Shengji Technology Co ltd
Current assignee: Beijing Puyi Shengji Technology Co ltd
Priority date: 2022-11-14
Filing date: 2023-03-09
Publication date: 2023-11-10
Anticipated expiration: 2033-03-09
Also published as: CN115474972A

Abstract

The utility model provides an inward pushing component and a transvascular implant conveying device, and relates to the field of medical appliances; the push-pull wire body passes through the lumen of the limiting tube, and the far end of the push-pull wire body is provided with an elastic dechucking ring; the elastic dechucking ring is provided with a tightening state which is retracted into the lumen of the limiting tube in the proximal direction so as to be radially compressed and a releasing state which is pushed out of the lumen of the limiting tube in the distal direction so as to be annular; the transvascular implant delivery device comprises an ingress pipe, a delivery catheter and the aforementioned push-in assembly; the inner diameter of the lumen of the ingress pipe and the inner diameter of the lumen of the delivery catheter are both larger than the inner diameter of the lumen of the limiting pipe in the push-in assembly. The utility model not only ensures that the implant is not completely released after being pushed out of the outer sheath, but also can be retracted back into the inner part of the outer sheath to readjust the release position, and can ensure that the actual release process is simple, quick and convenient to implement.

Description

Pushing assembly and transvascular implant delivery device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to an internal pushing assembly and a transvascular implant conveying device.

Background

In the intravascular treatment by means of intravascular interventional therapy, it is often involved that the implant such as a stent, a filter, a blocking device and the like is required to be separated from the delivery device and remain at the target point or target site, the fixation is continued to be realized, and the supporting, filtering, filling and the like are realized at the target point.

Mainly comprises the following steps: the method comprises the steps of conveying and releasing an implant by using an outer sheath tube and an inner pushing assembly (multi-guide wire) arranged in the outer sheath tube, compressing the implant in the outer sheath tube and placing the implant at the front end of the inner pushing assembly when loading, keeping the outer sheath tube motionless after conveying the implant into place, and pushing the inner pushing assembly forward to align a target part to push the implant forward until the implant is pushed out of the outer sheath tube, wherein in some structures, the implant is not connected with the inner pushing assembly, or the rear end of the implant is buckled with the front end of the inner pushing assembly, and in the structures, the implant is directly separated from the inner pushing assembly after being pushed out of the outer sheath tube; there are also structures in which the rear end of the implant is threaded onto the front end of the push-in assembly, and in such structures it is necessary to fix the implant after it has been pushed out of the sheath (the fixation means mainly comprising the anchoring of the implant itself to the vessel wall, or the conveyor also comprising other cables for specific fixation of the implant), and then rotate the push-in assembly to disengage the implant from the push-in assembly.

However, in the above connection, either the implant is released directly at the target site after being pushed out of the outer sheath, so that no readjustment is withdrawn once erroneously released (e.g., the release angle is unequal); or the implant can be released only by fixing the implant after being pushed out of the outer sheath and rotating the inner pushing assembly, although the implant is not directly released after being pushed out of the outer sheath, the implant can be withdrawn from the outer sheath and the release position can be readjusted when the implant is not separated from the inner pushing assembly, the implant is required to be fixed and the inner pushing assembly is rotated when the implant is actually released, the process is complicated and complicated, the vascular wall is easy to damage, and when the implant is fixed, the implant is required to be anchored on the vascular wall, the structural requirement on the implant is high, otherwise, an operation cable is required to be additionally arranged to assist in fixing the implant, the structural requirement on a conveyer is high, the skill requirement on an operator (an operator) is also high, and the implementation is inconvenient.

There is a great need to provide a delivery device that can not only ensure that the implant is not completely released after it has been pushed out of the sheath, but that the implant can be withdrawn back inside the sheath to readjust the release position, and that the actual release process is simple, quick and easy to implement.

Disclosure of Invention

The utility model aims to provide an inward pushing component and a transvascular implant conveying device, which can ensure that the implant is not completely released after being pushed out of an outer sheath tube, the implant can be withdrawn back into the outer sheath tube to readjust the release position, and the actual release process is simple, quick and convenient to implement.

In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:

in a first aspect, embodiments of the present utility model provide an invagination assembly for use with a transvascular implant delivery device, in particular, comprising a push wire and a stopper tube; the push-pull wire comprises a body, the body passes through the lumen of the limiting tube, and the far end of the body is provided with an elastic dechucking ring; the elastic release ring is provided with a tightening state of retracting into the inner part of the lumen of the limit pipe in the proximal direction so as to be radially compressed and a releasing state of pushing out the lumen of the limit pipe in the distal direction so as to be annular.

The push-in assembly is suitable for any implant with a stop that can be elastically released and looped, including but not limited to spherical instruments with rings at the ends or other shaped instruments, occluders for use in the treatment of atrial septal and ventricular septal defects, cerebral aneurysm body tamponade spherical instruments, endovascular spherical therapeutic instruments, and the like.

When the implant loading device is used, the elastic release ring at the distal end of the push-pull wire can be completely released at the distal end side of the limiting tube by pushing out the push-pull wire in the distal end direction relative to the limiting tube, then the limiting part on the implant is sleeved in the elastic release ring at the distal end of the push-pull wire, and next, the push-pull wire is pulled back in the proximal end direction relative to the limiting tube, so that the elastic release ring at the distal end of the push-pull wire is retracted in the lumen of the limiting tube in the proximal end direction until the limiting part on the implant is locked at the distal end of the limiting tube, and the implant loading function is realized; when the implant is required to be released, after the release position is selected, the push-pull wire is pushed out towards the distal end direction relative to the limiting tube, so that the elastic release ring at the distal end of the push-pull wire is completely released at the distal end side of the limiting tube, and the implant can be completely released from the push-pull wire to achieve the implantation function.

When the implant is delivered into the patient, the implant can be further loaded into the outer sheath tube with a larger diameter (the preferable loading mode is that the implant is made of an elastically deformable material), or can be directly exposed outside the outer sheath tube and fixed by elastic decyclization. In the release process, compared with the threaded rotary release implant in the prior art, the damage to the vascular wall is obviously much smaller, the implant is not required to be released after being fixed by other operation cables, the release safety and the convenience of the release process operation can be improved, the operation time is saved, and the operation success rate is improved. In summary, the transvascular implant delivery device using the push-in assembly not only ensures that the implant is not completely released after being pushed out of the outer sheath, but also can be retracted back into the outer sheath to readjust the release position, and also ensures that the actual release process is simple, quick and convenient to implement.

In some optional implementations of this embodiment, in the push-wire, the distal end of the body is bent in a proximal direction and then fixedly connected to the body, so as to form a ferrule at the distal end of the body, and the distal end portion of the ferrule forms the elastic dechucking ring.

Further preferably, in the push-wire drawing, the distal end of the body is fixedly connected to a portion of the body near the distal end after being bent in a proximal direction, or the distal end of the body is fixedly connected to a proximal portion of the body after being bent in a proximal direction.

In other optional embodiments, in the push-pull wire, after the distal end of the body is bent in the proximal direction, the distal end of the limiting tube is inserted into the limiting tube and passes out of the proximal end of the limiting tube, the distal end of the body is separated from other parts of the body, and the part of the body located on the distal end side of the limiting tube forms the elastic declutching ring.

In an optional implementation manner of this embodiment, preferably, in the push-wire, an included angle is formed between a plane where the elastic release ring is located and a length direction of the body, and the included angle is greater than 0 degrees and less than 180 degrees.

In an alternative implementation manner of this embodiment, preferably, a push-pull handle is connected to the proximal end of the push-pull wire.

In an alternative implementation manner of this embodiment, preferably, a positioning mechanism for fixing the proximal end of the push-pull wire to the limiting tube is disposed at the proximal end of the limiting tube.

Further preferably, the positioning mechanism adopts a knob assembly, the knob assembly comprises a tubular shell and a rotating rod which is installed on a threaded hole on the side surface of the tubular shell in a threaded manner, the distal end of the tubular shell is connected to the proximal end of the limiting tube, the lumen of the tubular shell is communicated with the lumen of the limiting tube, and the push-pull wire penetrates through the tubular shell.

In an alternative implementation manner of this embodiment, it is preferable that the limiting tube is wound by a spring wire.

In a second aspect, embodiments of the present utility model provide a transvascular implant delivery device comprising an introduction tube, a delivery catheter, and an push-in assembly according to any of the preceding embodiments; the inner diameter of the lumen of the ingress pipe and the inner diameter of the lumen of the delivery catheter are both larger than the inner diameter of the lumen of the limiting pipe in the inward pushing assembly.

Because the transvascular implant delivery device provided by the embodiment of the utility model includes the push-in assembly provided by the first aspect, the transvascular implant delivery device provided by the embodiment of the utility model can achieve all the beneficial effects achieved by the push-in assembly provided by the first aspect, and more specific implementation steps of the transvascular implant delivery device can be obtained by referring to the following description.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an overall structure of an inner pushing assembly provided by an embodiment of the present utility model in a release state when a push-pull wire elastically releases a ring;

fig. 2 is a schematic view showing a first step of delivering in the transvascular implant delivery device according to the present embodiment;

fig. 3 is a schematic view showing a second step of delivering in the transvascular implant delivery device according to the present embodiment;

fig. 4 is a schematic view showing a first state of a third step of the transvascular implant delivery device according to the present embodiment;

fig. 5 is a schematic view showing a second state of the third step of the transvascular implant delivery device according to the present embodiment;

fig. 6 is a schematic view showing a first state of a fourth step of the transvascular implant delivery device according to the present embodiment;

fig. 7 is a schematic view showing a second state of the fourth step of the transvascular implant delivery device according to the present embodiment;

fig. 8 is a schematic diagram showing a fifth step of delivering in the transvascular implant delivery device according to the present embodiment;

fig. 9 is a schematic diagram showing a sixth step of delivering a transvascular implant delivery device according to the present embodiment.

Icon: 100-an implant; 101-a limiting part; 1-pushing and drawing; 11-a body; 12-elastic decyclization; 13-push-pull handle; 2-limiting pipes; 3-a positioning mechanism; 31-a tubular housing; 32-rotating a rod; 4-ingress pipe; 5-delivery catheter.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "proximal", "distal", "front", "rear", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In particular, in the present utility model, the end of the medical device close to the operator is the proximal end of the medical device during surgery, and the end of the medical device entering the blood vessel of the patient is the distal end of the medical device (the front end of the medical device is the distal end, and the rear end of the medical device is the proximal end).

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

The first aspect of the present embodiment provides an endoprosthesis assembly for use in a transvascular implant delivery device, in particular, referring to fig. 1, comprising a push wire 1 and a stopper tube 2; the push wire 1 comprises a body 11, the body 11 passes through the lumen of the limiting tube 2, and the far end of the body 11 is provided with an elastic declutching ring 12; the elastic release ring 12 has a tightened state of being retracted into the lumen of the stopper tube 2 in the proximal direction so as to be radially compressed, and a released state of being pushed out of the lumen of the stopper tube 2 in the distal direction so as to be annular, and the elastic release ring 12 can be made of nickel-titanium memory alloy, but is not limited to the above, and has high elasticity.

The push-in assembly is suitable for use with any implant 100 having a stop 101 that can be captured by an elastically releasable ring 12, including but not limited to a balloon-like instrument or other shaped instrument having a ring at its distal end, an occluder for use in the treatment of atrial and ventricular septal defects, a cerebral aneurysm body tamponade balloon-like instrument, an endovascular balloon-like therapeutic instrument, and the like.

When the implant 100 loading device is used, the elastic release ring 12 at the far end of the push wire 1 can be completely released at the far end side of the limit pipe 2 by pushing the push wire 1 towards the far end direction relative to the limit pipe 2, then the limit part 101 on the implant 100 is sleeved in the elastic release ring 12 at the far end of the push wire 1, and next, the push wire 1 is pulled back towards the near end direction relative to the limit pipe 2, so that the elastic release ring 12 at the far end of the push wire 1 is retracted into the tube cavity of the limit pipe 2 towards the near end direction until the limit part 101 on the implant 100 is locked at the far end of the limit pipe 2, and the implant 100 loading function is realized; when the implant 100 needs to be released, after the release position is selected, the push wire 1 is pushed out towards the distal end direction relative to the limiting tube 2, so that the elastic release ring 12 at the distal end of the push wire 1 is completely released at the distal end side of the limiting tube 2, and the implant 100 can be completely released from the push wire 1 to achieve the implantation function.

When the implant 100 is delivered into the patient, the implant 100 may be further loaded into the larger diameter sheath (as is preferable when the implant 100 is an elastically deformable material), or may be directly exposed to the exterior of the sheath and secured by the elastic release ring 12. In the release process, compared with the threaded rotation release implant in the prior art, the damage to the vascular wall is obviously smaller, the implant 100 is not required to be released by fixing the implant 100 by other operation cables, the release safety and the convenience of the release process operation can be improved, the operation time is saved, and the operation success rate is improved. In summary, the transvascular implant delivery device employing the push-in assembly not only ensures that the implant 100 is not completely released after the implant 100 is pushed out of the outer sheath, but also can readjust the release position by readjusting the interior of the outer sheath, and also ensures that the actual release process is simple, rapid and convenient to implement.

In addition, the second aspect of the present embodiment further provides a transvascular implant delivery device, referring to fig. 2 to 9, which includes an introduction tube 4, a delivery catheter 5 (i.e., the above-mentioned outer sheath tube), and the push-in assembly provided in the above-mentioned first aspect; wherein: the inner diameter of the lumen of the ingress pipe 4 and the inner diameter of the lumen of the delivery catheter 5 are both larger than the inner diameter of the lumen of the limiting pipe 2 in the push-in assembly.

In use, as shown in fig. 2, the push wire 1 is pushed out in a distal direction relative to the limit tube 2, so that the elastic declutching ring 12 at the distal end of the push wire 1 is completely released at the distal end side of the limit tube 2, and then the limit portion 101 on the implant 100 is sleeved in the elastic declutching ring 12 at the distal end of the push wire 1, specifically, the elastic declutching ring 12 is sleeved in a narrow place between the body of the implant 100 and the limit portion 101 thereon;

second, as shown in fig. 3, the push wire 1 is pulled back in a proximal direction relative to the limiting tube 2, so that the elastic release ring 12 at the distal end of the push wire 1 is retracted into the lumen of the limiting tube 2 in the proximal direction until the limiting portion 101 on the implant 100 is locked at the distal end of the limiting tube 2, loading of the implant 100 is completed, and the steps and the first step together complete fixation and preparation delivery of the implant 100;

thirdly, as shown in fig. 4 and 5, the proximal end of the whole inner pushing assembly is penetrated into the ingress pipe 4 from the distal end of the ingress pipe 4 and pulled out from the proximal end of the ingress pipe 4 until the whole distal end of the inner pushing assembly and the whole implant 100 are tightened and preloaded in the ingress pipe 4;

fourth, as shown in fig. 6 and 7, the distal end of the introduction tube 4 is aligned with the proximal end of the delivery catheter 5, and the stopper tube 2 is pushed in the distal direction until the implant 100 reaches the front end of the lumen of the delivery catheter 5;

fifth, as shown in fig. 8, after the target site is properly determined, the delivery catheter 5 is retracted relative to the stopper tube 2, so that the entire distal end of the push-in assembly and the implant 100 are pushed out of the front end of the delivery catheter 5;

sixth, as shown in fig. 9, it is determined that the state of the implant 100 is not abnormal, the push wire 1 is pushed out in the distal direction with respect to the stopper tube 2, so that the elastic dechucking ring 12 at the distal end of the push wire 1 is completely released at the distal end side of the stopper tube 2 to be in a ring-shaped release state, and the release dechucking process of the implant 100 is completed.

Since the transvascular implant delivery device according to the second aspect of the present embodiment includes the push-in assembly according to the first aspect of the present embodiment, the specific structure and the effects that can be achieved by the transvascular implant delivery device according to the present embodiment can be obtained by referring to the optional or preferred embodiments of the push-in assembly, and all the advantages that can be achieved by the push-in assembly can be achieved.

More specifically, in the above-described push-in assembly and the transvascular implant delivery device including the push-in assembly provided in the present embodiment, further:

in some alternative embodiments, in the push-pull wire 1, the distal end of the body 11 is fixedly connected to the body 11 after being bent in the proximal direction, so as to form the above-mentioned loop at the distal end of the body 11, and the distal end portion of the loop forms the above-mentioned elastic dechucking loop 12. The portion of the body 11 that is fixedly connected to the body 11 after bending may be a portion of the body 11 near the distal end, or may be a proximal portion of the body 11, where the specific fixing connection manner includes, but is not limited to, welding, fusion, or adhesion.

In other alternative embodiments, in the push-pull wire 1, after the distal end of the body 11 is bent in the proximal direction, the distal end of the body 11 is inserted into the stopper 2 from the distal end of the stopper 2 and passes out of the stopper 2 from the proximal end of the stopper 2, the distal end of the body 11 is separated from other parts of the body 11, and the part of the body 11 located on the distal end side of the stopper 2 forms the aforementioned elastic decyclization 12.

In some alternative embodiments: in the push-pull wire 1, an included angle is formed between the plane where the elastic dechucking ring 12 is located and the length direction of the body 11, and the included angle is greater than 0 degrees and less than 180 degrees, so that the operation is facilitated.

In some alternative embodiments, as shown in fig. 1, it is preferable that the proximal end of push wire 1 also has a push-pull handle 13 attached.

With continued reference to fig. 1 to 9, and particularly with reference to fig. 1, in the present embodiment, it is preferable that a positioning mechanism 3 for fixing the proximal end of the push wire 1 to the stopper tube 2 is provided at the proximal end of the stopper tube 2, by which positioning mechanism 3 the elastic release ring 12 is further ensured not to be released during the delivery process, and the stability of the implant 100 during the delivery process is ensured, and of course, the positioning mechanism 3 is not required, the push wire 1 is positioned to the stopper tube 2 by means of interference fit between the stopper tube 2 and the push wire 1, the driving force is given to the push wire 1, and the push wire 1 is movable relative to the stopper tube 2, or the proximal end of the push wire 1 is fixed to the stopper tube 2 by means of multiple windings around the proximal end of the stopper tube 2 after the push wire 1 is fixed to the stopper tube 2, or the push wire 1 and the stopper tube 2 are positioned by other means.

Further preferably, as shown in fig. 1, the positioning mechanism 3 adopts a knob assembly, the knob assembly comprises a tubular shell 31 and a rotating rod 32 which is arranged on the side surface of the tubular shell 31 in a threaded way, the distal end of the tubular shell 31 is connected to the proximal end of the limiting tube 2, the lumen of the tubular shell 31 is communicated with the lumen of the limiting tube 2, the push wire 1 passes through the tubular shell 31, and the function of fixing or releasing the push wire 1 on the limiting tube 2 is achieved by rotating the rotating rod 32.

In some alternative implementations of this embodiment, as shown in fig. 1 to 9, it is preferable that the limiting tube 2 is wound by a spring wire to ensure flexibility, so as to more facilitate penetration into a tortuous blood vessel and reduce damage to the blood vessel during surgery, and of course, in this embodiment, the limiting tube 2 may also be a common hose structure, but is more preferably wound by a spring wire.

Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are only required to be seen with each other; the above embodiments in the present specification are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. An internal pushing component applied to a transvascular implant delivery device, which is characterized in that: the inner pushing assembly comprises a pushing wire (1) and a limiting tube (2); the push-pull wire (1) comprises a body (11), wherein the body (11) penetrates through the lumen of the limiting tube (2), and an elastic decyclization ring (12) is arranged at the far end of the body (11);

the elastic declutching ring (12) has a tightened state of being retracted inside the lumen of the stopper tube (2) in a proximal direction so as to be radially compressed and a released state of being pushed out of the lumen of the stopper tube (2) in a distal direction so as to be annular.

2. The thrust assembly of claim 1, wherein: in the push-pull wire (1), the distal end of the body (11) is fixedly connected to the body (11) after being bent in the proximal direction, so as to form a ferrule at the distal end of the body (11), and the elastic dechucking ring (12) is formed at the distal end part of the ferrule.

3. The thrust assembly of claim 2, wherein: in the push-pull wire (1), the distal end of the body (11) is fixedly connected to a part, close to the distal end, on the body (11) after being bent in the proximal direction, or the distal end of the body (11) is fixedly connected to the proximal part of the body (11) after being bent in the proximal direction.

4. The thrust assembly of claim 1, wherein: in the push-pull wire (1), after the far end of the body (11) is bent towards the proximal direction, the far end of the limiting tube (2) is inserted into the limiting tube (2) and penetrates out of the proximal end of the limiting tube (2), the far end of the body (11) is mutually separated from other parts of the body (11), and the part of the body (11) positioned at the far end side of the limiting tube (2) forms an elastic dechucking ring (12).

5. The thrust assembly of claim 1, wherein: in the push-pull wire (1), an included angle is formed between the plane where the elastic dechucking ring (12) is located and the length direction of the body (11), and the included angle is larger than 0 degree and smaller than 180 degrees.

6. The thrust assembly of claim 1, wherein: the proximal end of the push-pull wire (1) is connected with a push-pull handle (13).

7. The thrust assembly of claim 1, wherein: the proximal end of the limiting tube (2) is provided with a positioning mechanism (3) for fixing the proximal end of the push-pull wire (1) to the limiting tube (2).

8. The thrust assembly of claim 7, wherein: the positioning mechanism (3) adopts a knob assembly, the knob assembly comprises a tubular shell (31) and a rotating rod (32) which is threadedly mounted on a threaded hole on the side face of the tubular shell (31), the distal end of the tubular shell (31) is connected with the proximal end of the limiting tube (2) and the lumen of the tubular shell (31) is communicated with the lumen of the limiting tube (2), and the push-pull wire (1) penetrates through the tubular shell (31).

9. The thrust assembly of claim 1, wherein: the limiting tube (2) is formed by winding a spring wire.

10. A transvascular implant delivery device, characterized by: comprising an inlet tube (4), a delivery tube (5) and an inner push assembly according to any one of claims 1 to 9; the inner diameter of the lumen of the ingress pipe (4) and the inner diameter of the lumen of the delivery catheter (5) are both larger than the inner diameter of the lumen of the limiting pipe (2) in the inward pushing assembly.