WO2022041903A1

WO2022041903A1 - Stent device and stent system

Info

Publication number: WO2022041903A1
Application number: PCT/CN2021/097490
Authority: WO
Inventors: 赵明杰; 朱永锋; 彭大冬; 朱清; 赵淑华
Original assignee: 上海微创心脉医疗科技(集团)股份有限公司
Priority date: 2020-08-31
Filing date: 2021-05-31
Publication date: 2022-03-03
Also published as: AR123388A1; CN114099063A

Abstract

A stent device and a stent system. The stent device comprises a stent (200) and a control mechanism (100), the control mechanism (100) comprises a control guide wire (110) and a traction portion (120) arranged on the control guide wire (110), and the control guide wire (110) is arranged in an axial direction of the stent (200) and movably arranged on an inner wall of the stent (200); a window (201) is arranged on the stent (200), a connecting portion (210) and a limiting portion are further arranged on the stent, and the connecting portion (210) is arranged on the side of the stent (200) provided with the window (201), and is used for being connected to the traction portion (120); and the limiting portion is used for limiting the position of the control guide wire (110) in a circumferential direction and a radial direction of the stent (200). When the stent (200) is in an expanded state, the control guide wire (110) applies a pulling force to the connecting portion (210) by means of the traction portion (120), such that the stent wall around the window (201) sinks towards an inner cavity of the stent (200), separation from the blood vessel wall is achieved, and ischemia of a branch blood vessel caused by blocking the branch blood vessel when the window (201) is not aligned with a branch stent is avoided.

Description

A bracket device and bracket system

technical field

The invention relates to the technical field of medical devices, in particular to a stent device and a stent system.

Background technique

Stent graft fenestration technology is generally used in the treatment of diseases involving bifurcated vessels, and it has the advantages of isolating diseased vessels and maintaining the blood flow of bifurcated vessels. However, there are individual differences in the vascular morphology of patients. Therefore, when the pre-fenestrated stent-graft is delivered to the lesion site for release, the alignment of the window and the bifurcated blood vessel is likely to be inaccurate. At this time, if the stent wall around the window and the blood vessel are Wall fit will cause bifurcation vessel occlusion, causing bifurcation vessel ischemia, resulting in severe cerebral infarction, upper limb ischemia and other complications. Not only that, a branch stent is generally installed at the window. If the alignment of the window and the bifurcated blood vessel is not accurate, it will also cause difficulty in establishing a branch stent guide wire path, or even impossible to establish a branch stent guide wire path.

Based on this, during the clinical operation, it is very necessary to keep the stent wall around the window of the stent-graft in a separated state from the blood vessel wall for a certain period of time after the stent-graft is released.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a stent device and a stent system, which can effectively avoid the occlusion of branch blood vessels caused by the inaccurate position of the stent after the stent is released.

In order to achieve the above object, the present invention provides a bracket device, comprising a bracket and a control mechanism, wherein,

The control mechanism comprises a control guide wire and a pulling part arranged on the control guide wire, the control guide wire is arranged along the axial direction of the stent and is used to be movably arranged on the inner wall of the stent;

The bracket is provided with a window, a connecting part and a limiting part; the connecting part is arranged on the side of the bracket where the window is provided, and is used for connecting with the pulling part; the limiting part is used for restricting the position of the control guide wire in the circumferential and radial directions of the stent;

The stent device is configured such that when the pulling portion is connected to the connecting portion and the stent is in an expanded state, the control guide wire applies a pulling force to the connecting portion through the pulling portion, so as to cause the stent to be pulled. The stent wall around the window is recessed towards the lumen of the stent.

Optionally, the connecting portion includes a first coil, and the proximal end of the pulling portion is connected to a connecting point on the control guide wire;

the pulling portion passes through the first coil and the distal end of the pulling portion is sheathed on the distal side of the control guide wire at the connection point;

The stent device is configured such that when the control guide wire is moved in the axial direction of the stent toward the proximal end of the stent, the distal end of the pulling portion is disengaged from the control guide wire and removed from the first end of the stent. A coil is passed through to release the connection between the pulling part and the connecting part.

Optionally, the pulling part comprises a pulling rope and a second coil, the proximal end of the pulling rope is connected with the control guide wire, and the distal end of the pulling rope is connected with the second coil; The pulling rope is used to pass through the first coil, and the second coil is used to be sleeved on the control guide wire.

Optionally, the pulling portion includes a pulling rope in an annular structure.

Optionally, the number of the connecting portion is one, and the length of the pulling portion is greater than the distance from the connecting point to the distal end of the control guide wire, and is less than the stent in a natural expansion state. twice the diameter at the window.

Optionally, the limiting portion includes at least two sub-limiting portions, and the at least two sub-limiting portions are arranged at intervals along the axial direction of the stent; the distal end of the pulling portion is sleeved on the control on the guide wire and located between two adjacent sub-limiting parts.

Optionally, the sub-limiting portion includes a third coil, and the control guide wire is used to movably pass through the third coil.

Optionally, at least two of the sub-limiting portions are arranged on both axial sides of the connecting portion.

Optionally, the bracket has a radially opposite first side and a second side, the first side is provided with the window, and the second side is provided with the limiting portion.

Optionally, the stent includes a stent body and a coating covering the stent body, and both the connecting portion and the limiting portion are sewn on the stent body.

To achieve the above objects, the present invention also provides a stent system, comprising a delivery device and the stent device according to any one of the preceding items, the delivery device is used to deliver the stent device to a predetermined position.

Compared with the prior art, the stent device and stent system of the present invention have the following advantages:

First, the aforementioned stent device includes a stent and a control mechanism, wherein the control mechanism includes a control guide wire and a pulling portion provided on the control guide wire, and the control guide wire is arranged along the axial direction of the stent, and is used to be movably arranged on the inner wall of the bracket; the bracket is provided with a window, a connecting part and a limiting part, and the connecting part is arranged on the side of the bracket with the window and is used for connecting with all the brackets. The pulling part is connected; the limiting part is used to limit the position of the control guide wire in the circumferential and radial directions of the stent. The stent device is configured such that when the pulling portion is connected to the connecting portion and the stent is in an expanded state, the control guide wire applies a pulling force to the connecting portion through the pulling portion, so as to cause the stent to be pulled. The stent wall around the window is recessed towards the lumen of the stent. The stent is delivered to the intravascular lesion site and then released, and the stent wall around the window is concave toward the stent lumen and away from the blood vessel wall under the pulling action of the control mechanism, so as to ensure that the branch blood vessel is not blocked, neither. It will cause branch vessel ischemia, and will not adversely affect the construction of the guide wire pathway of the branch stent at the window.

Second, the connecting portion includes a first coil, and the proximal end of the pulling portion is connected to a connection point on the control guide wire; the pulling portion passes through the first coil and the pulling portion The distal end of the control guide wire is connected to the distal end side of the control guide wire at the connection point, so as to realize the connection of the pulling part and the connecting part; the stent device is configured to be used when the control guide wire is When moving toward the proximal end of the stent along the axial direction of the stent, the distal end of the pulling part is separated from the control guide wire and passes through the first coil, so as to release the pulling part from the other end. the connection of the connecting part. During the process of withdrawing the control guide wire from the body, the connection between the pulling part and the connecting part can be released, so that the stent wall near the window is attached to the blood vessel wall, and the operation is simple and convenient.

Description of drawings

The accompanying drawings are used for better understanding of the present invention and do not constitute an improper limitation of the present invention. in:

1 is a schematic structural diagram of a stent device according to an embodiment of the present invention;

2 is a schematic structural diagram of a control mechanism of a stent device provided by the present invention according to an embodiment;

3 is a schematic structural diagram of a control mechanism of a stent device provided by another embodiment of the present invention;

4 is a schematic structural diagram of a stent of a stent device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the stent device according to an embodiment of the present invention when the stent device is implanted into the aortic arch.

In the picture:

100-control mechanism; 110-control guide wire; 120-pulling part; 121-pulling rope, 122-second coil; 200-support; 201-window; 210-connecting part; 221-sub-limiting part.

detailed description

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.

In addition, each embodiment of the following description has one or more technical features, but this does not mean that the person using the present invention must implement all the technical features in any embodiment at the same time, or can only implement different embodiments separately. One or all of the technical features of the . In other words, under the premise of possible implementation, those skilled in the art can selectively implement some or all of the technical features in any embodiment according to the disclosure of the present invention and depending on design specifications or implementation requirements, or The combination of some or all of the technical features in the multiple embodiments is selectively implemented, thereby increasing the flexibility of the implementation of the present invention.

As used in this specification, the singular forms "a," "an," and "the" include plural referents, and the plural forms "a plurality" include two or more referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "installed", "connected", "connected" shall be To be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As used herein, the terms "proximal", "distal" are the relative orientation, relative position, orientation of elements or actions relative to each other from the perspective of the physician using the medical device, although "proximal", "distal" " is not limiting, but "proximal" generally refers to the end of the medical device that is closest to the physician during normal operation, and "distal" generally refers to the end that first enters the patient.

The core idea of the present invention is to provide a stent device, which is mainly used for the treatment of lesions at bifurcated vessels, such as lesions at the aortic arch involving branch arteries. The stand device includes a stand and a control mechanism. The control mechanism includes a control guide wire and a pulling part arranged on the control guide wire. The control guide wire is arranged along the axial direction of the stent and can be movably arranged on the inner wall of the stent. The bracket is provided with a window, a connecting part and a limiting part, the connecting part is arranged on the side of the bracket where the window is provided, and is used for connecting with the pulling part; the limiting part is used for limiting The position of the control guide wire in the circumferential and radial directions of the stent. The stent is configured such that when the pulling part is connected to the connecting part and the stent is in an expanded state, the control guide wire applies a pulling force to the connecting part through the pulling part, so that the The bracket wall around the window is recessed toward the inner cavity of the bracket. That is, when the stent is released at the lesion site, the connecting portion around the window is pulled by the control mechanism, so that the stent wall around the window is away from the blood vessel wall, so that there is a gap between the two, and blood flow can be prevented. The branch blood vessels flow into this gap, so as to avoid the occlusion of the branch blood vessels due to inaccurate alignment of the window and the branch stent. If the window is also provided with a branch stent, since there is a gap between the stent wall and the blood vessel wall around the window, even if the window and the branch blood vessel are not accurately aligned, the construction of the control guide wire channel of the branch stent will not be adversely affected. .

In more detail, the connecting portion includes a first coil, and the proximal end of the pulling portion is connected to a connection point on the control guide wire; the pulling portion passes through the first coil and is The distal end of the pulling portion is sleeved on the distal side of the control guide wire at the connection point, and then positioned to the point where the control guide wire is positioned at the connection point between the pulling portion and the control guide wire. On the distal end side, the connection between the pulling part and the connecting part is realized; the stent device is configured such that when the control guide wire moves toward the proximal end of the stent along the axial direction of the stent, the stent device The distal end of the pulling part is separated from the control guide wire and passes through the first coil to release the connection between the pulling part and the connecting part. That is to say, after the operator completes the posture adjustment of the stent and the construction of the guide wire passage of the branch blood vessel (when the branch stent needs to be installed), the connection between the pulling part and the connecting part can be released by withdrawing the control guide wire. , so that the stent wall adjacent to the window is attached to the blood vessel wall, and the operation is simple and convenient.

In order to make the objects, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. The same or similar reference numbers in the drawings represent the same or similar parts.

FIG. 1 shows a schematic structural diagram of a stent device provided by a preferred embodiment of the present invention, FIG. 2 and FIG. 3 respectively show structural schematic diagrams of two optional control mechanisms of the stent device, and FIG. 4 shows a stent of the stent device. Schematic diagram of the structure.

Please refer to FIG. 1 to FIG. 4 , the bracket device includes a control mechanism 100 and a bracket 200 . Wherein, the control mechanism 100 includes a control guide wire 110 and a pulling portion 120 disposed on the control guide wire 110, the control guide wire 110 is arranged along the axial direction of the stent 200, and can move movably arranged on the inner wall of the bracket 200 . The stent 200 is usually a stent-graft, and a window 201 that communicates with the inner cavity of the stent is provided on the stent 200 , and a connecting portion 210 and a limiting portion are also provided on the stent 200 . The connecting portion 210 is disposed on the side of the bracket 200 where the window 201 is provided, and is used for connecting with the pulling portion 120 . The limiting portion is used to limit the position of the control guide wire 110 in the circumferential and radial directions of the stent 200 . The stent device is configured such that when the pulling portion 120 is connected to the connecting portion 210 and the stent 200 is in an expanded state, the control guide wire 110 passes through the pulling portion 120 to the connecting portion. 210 exerts a pulling force so that the stent wall around the window 201 is recessed toward the lumen of the stent 200 . Those skilled in the art can understand that the connecting portion 210 is arranged at the periphery of the window 201. In some embodiments, the connecting portion 210 is arranged at the edge of the window 201. In other embodiments, the The connecting portion 210 and the edge of the window 201 have a predetermined distance, and the predetermined distance is determined according to the actual situation. As long as the control guide wire 110 exerts a pulling force on the connecting portion 210 through the pulling portion, all the The bracket wall around the window 201 may be recessed.

FIG. 5 shows a schematic diagram of the stent device applied to aortic arch lesions involving branch vessels. As shown in Fig. 5, when the stent device is implanted into the aortic arch of a patient, the side of the stent 200 provided with the window 201 is disposed toward the greater curvature of the aortic arch. Ideally, after the stent 200 is released, one of the windows 201 should be aligned with one of the branch arteries, so that blood flow can flow into the branch arteries from the window 201 . However, in the actual operation process, the alignment of the window 201 and the branch artery is often inaccurate due to various reasons, and the branch blood vessel is blocked. The control mechanism 100 of the stent device provided in this embodiment pulls the stent through the pulling part 120 The connecting part 210 on the 200 makes the stent wall around the window 201 recess toward the lumen of the stent 200 to form a gap with the blood vessel wall, so that blood flow can flow into the gap from the window 201 , and then flow into branch vessels to avoid branch vessel ischemia. When a branch stent needs to be arranged at the window 201, the existence of the gap also makes the construction of the branch blood vessel guide wire easier. In this embodiment, the stent 200 includes a stent body and a covering film disposed on the stent body, and both the connecting portion 210 and the limiting portion are sewn on the stent body of the stent 200 . In other embodiments, the connecting portion 210 and the limiting portion may also be sewn on the covering film, which is determined according to actual conditions.

Further, referring to FIG. 1 , the bracket 200 has a first side and a second side diametrically opposite, and the window 201 is disposed on the first side (that is, the first side is on the first side). In actual use, the side adjacent to the greater curvature of the aortic arch, or in other bifurcated vessels, the first side is the side adjacent to the branched vessel), then the connecting portion 210 is also arranged on the first side and the limiting portion is preferably arranged on the second side, so that the control guide wire 110 is movably arranged on the inner wall of the second side of the bracket 200 . The advantage of this arrangement is that when the stent 200 is in the expanded state, the pulling force exerted by the control guide wire 110 on the connecting portion 210 is maximized, ensuring that the stent wall adjacent to the window 201 can reach the stent 200 cavity depression.

Further, the pulling portion 120 is a flexible elongated structure, and the proximal end thereof can be connected to the connection point on the control guide wire 110 by hot melting, gluing or other suitable methods. The connection part 210 includes at least one first coil. The pulling part is passed through the first coil, and the distal end of the pulling part is sheathed on the distal side of the control guide wire located at the connection point, so as to realize the pulling The connection between the part 120 and the connection part 210 . Meanwhile, the stent device is configured such that when the control guide wire 110 moves toward the proximal end of the stent 200 along the axial direction of the stent 200 , the distal end of the pulling portion 120 is disengaged from the control guide wire 110 . , and pass through the first coil to release the connection between the pulling part 120 and the connecting part 210 . Specifically, the distal end of the pulling portion 120 can be connected to the distal end of the control guide wire at the connection point after passing through the first coil from the proximal end side of the first coil. Above, the connection between the pulling part 120 and the connecting part 210 is realized. When the connection between the pulling part 120 and the connecting part 210 is released, the control guide wire 110 moves toward the proximal end of the stent 200 along the axial direction of the stent 200 , so that the The distal end is separated from the control guide wire 110 and passed through the first coil from the distal end side of the first coil. This structure makes it convenient for the operator to remove the control mechanism 100 from the stent 200 by withdrawing the control guide wire 110 to the outside of the body after completing the construction of the guide wire path of the branch stent. The pulling force exerted by the control guide wire 110 on the stent wall around the window 201 through the connecting portion 210 is released, so that the stent wall around the window 201 is in close contact with the blood vessel wall to block the lesion. Those skilled in the art can understand that the "proximal side of the first coil" refers to that when the posture of the first coil is adjusted so that the plane where the first coil is located is perpendicular to the axis of the stent 200, the The side of the first coil facing the proximal end of the stent 200, and the side of the first coil facing the distal end of the stent 200 in this posture is the “distal side of the first coil” ". In addition, the present invention does not limit the number of the first coils, which may also be two, three or more. The pulling portion passes through at least one of the first coils and then communicates with the control conductor. wire connection.

In more detail, please refer to FIG. 2 in conjunction with FIG. 1 , in an exemplary embodiment, the pulling part 120 includes a pulling cord 121 and a second coil 122 disposed at the distal end of the pulling cord 121 . . Next, please refer to FIG. 4 in conjunction with FIG. 1 , the limiting portion is disposed on the inner wall of the bracket 200 and includes at least two sub-limiting portions 221 , and the at least two sub-limiting portions 221 are along the axial direction of the bracket 200 . Arranged at intervals, for example, at least two of the sub-limiting portions 221 are distributed on both axial sides of the connecting portion 210 . Preferably, each of the sub-limiting portions 221 may include a third coil, and the control guide wire 110 is disposed on the inner wall of the second side of the stent 200 when the control guide wire 110 is passed through the third coil. .

In this embodiment, the limiting portion may include two sub-limiting portions 211 . When assembling the stent device, firstly, the head end of the control guide wire 110 is inserted into the lumen of the stent 200 from the proximal end of the stent 200, and passed through a position close to the proximal end of the stent 200. The sub-limiting portion 221; then, the distal end of the pulling portion 120 is passed through the connecting portion 210, and the distal end of the pulling portion 120 is sheathed from the distal end of the control guide wire 110 to the on the control guide wire 110; finally, move the control guide wire 110 toward the distal end of the stent 200, so that the distal end of the control guide wire 110 passes through the other sub-limiting portion 221 ( That is, a sub-limiting portion 221) near the distal end of the stent 200.

Here, in the assembled stent device, the distal end of the pulling portion 120 is sleeved on the portion of the control guide wire 110 located between the two adjacent sub-limiting portions 221, which is Because this part of the control wire 110 is restricted by the two sub-limiting parts 211 , it will not move towards the window 201 due to the reaction force of the connecting part 210 when the stent 200 is expanded, so that Ensure that the connecting portion 210 is effectively pulled.

The assembled stent device can be loaded into a delivery system after the stent 200 is crimped and delivered to the diseased blood vessel. After the stent 200 is released in the blood vessel, the control mechanism 100 pulls the connecting portion 210 to form a gap between the stent wall around the window 201 and the blood vessel wall. After the operator completes the posture adjustment of the stent 200 and the construction of the branch vessel guide wire pathway, the operator pulls back the proximal end of the control guide wire 110 to withdraw the control guide wire 110 from the body. , the distal end of the control guide wire 110 passes through the two sub-limiting parts 221 in sequence, and at the same time, after the pulling part 120 is separated from the control guide wire 110 , it passes through the connecting part 210 again. The connection between the pulling portion 120 and the connecting portion 210 is released, and at this time, the stent wall near the window 201 is attached to the blood vessel wall.

In this embodiment, the connecting portion 210 , the sub-limiting portion 211 and the pulling portion 120 are all made of wires, which are soft and easy to bend, and will not adversely affect the pressing and holding of the bracket 200 , nor will it The stent 200 is damaged. Moreover, the connecting portion 210 , the sub-limiting portion 221 and the distal end of the pulling portion 120 are all designed as coils, which have the advantages of simple structure, convenient and reliable use.

In an alternative embodiment, the pulling part 120 includes a pulling rope in an annular structure (as shown in FIG. 3 ), which can also achieve the above-mentioned purpose. In addition, when the number of the connecting portion 210 is one, the length of the pulling portion 120 (referring to the dimension when the pulling portion is stretched as a straight line) should be greater than the distance from the connecting point to the control guide wire 110 The distance between the end points is such that the pulling portion 120 can be sheathed on the control guide wire 110 from the distal end of the control guide wire 110 . In addition, the length of the pulling portion 120 should also be less than twice the diameter of the stent 200 in the natural expansion state at the window 201. The “natural expansion state” means that the control guide wire 110 is not The expanded state of the stent 200 (ie, the state shown in FIG. 4 ) when a pulling force is applied to the connecting portion 210 by the pulling portion 120 .

Further, an embodiment of the present invention also provides a stent system, the stent system includes the stent device as described above, the stent system may further include a delivery guide wire and a delivery sheath, the delivery guide wire is used for Removably penetrated within the lumen of the stent, the stent device is adapted to be compressed within the delivery sheath.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and variations can be made in the present invention by those skilled in the art without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

A bracket device, characterized in that it includes a bracket and a control mechanism, wherein:

The control mechanism comprises a control guide wire and a pulling part arranged on the control guide wire, the control guide wire is arranged along the axial direction of the stent and is used to be movably arranged on the inner wall of the stent;

The bracket is provided with a window, a connecting part and a limiting part; the connecting part is arranged on the side of the bracket where the window is provided, and is used for connecting with the pulling part; the limiting part is used for restricting the position of the control guide wire in the circumferential and radial directions of the stent;

The stent device is configured such that when the pulling portion is connected to the connecting portion and the stent is in an expanded state, the control guide wire applies a pulling force to the connecting portion through the pulling portion, so as to cause the stent to be pulled. The stent wall around the window is recessed towards the lumen of the stent.
The stent device according to claim 1, wherein the connecting portion comprises a first coil, and the proximal end of the pulling portion is connected to a connecting point on the control guide wire;

the pulling portion passes through the first coil and the distal end of the pulling portion is sheathed on the distal side of the control guide wire at the connection point;

The stent device is configured such that when the control guide wire is moved in the axial direction of the stent toward the proximal end of the stent, the distal end of the pulling portion is disengaged from the control guide wire and removed from the first end of the stent. A coil is passed through to release the connection between the pulling part and the connecting part.
The stent device according to claim 1 or 2, wherein the pulling part comprises a pulling wire and a second coil, the proximal end of the pulling wire is connected with the control guide wire, and the pulling The distal end of the rope is connected with the second coil; the pulling rope is used to pass through the first coil, and the second coil is used to be sleeved on the control guide wire.
The stent device according to claim 1 or 2, wherein the pulling part comprises a pulling rope in an annular structure.
The stent device according to claim 2, wherein the number of the connecting portion is one, and the length of the pulling portion is greater than the distance from the connecting point to the distal end of the control guide wire, and Less than twice the diameter of the stent at the window in its natural expanded state.
The stent device according to claim 2, wherein the limiting portion comprises at least two sub-limiting portions, and the at least two sub-limiting portions are arranged at intervals along the axial direction of the stent; the pulling The distal end of the part is sleeved on the control guide wire and is located between two adjacent sub-limiting parts.
The stent device according to claim 6, wherein the sub-limiting portion comprises a third coil, and the control guide wire is used to movably pass through the third coil.
The stent device according to claim 6, wherein at least two of the sub-limiting parts are arranged on both sides of the connecting portion in the axial direction.
2. The stent assembly of claim 1, wherein the stent has diametrically opposed first and second sides, the first side having the window disposed thereon, and the second side having the window disposed thereon the limiting part.
The stent device according to claim 1, wherein the stent comprises a stent body and a coating covering the stent body, and the connecting portion and the limiting portion are both sewn on the stent body superior.
A stent system, characterized by comprising a delivery device and the stent device according to any one of claims 1-10, wherein the delivery device is used to deliver the stent device to a predetermined position.