CN112869913A

CN112869913A - Self-expansion support system

Info

Publication number: CN112869913A
Application number: CN202110336077.6A
Authority: CN
Inventors: 李彬彬; 孙剑; 吕纬岩; 李剑博; 吕学良; 张尧; 任晓红; 徐明超; 王磊; 张鹏
Original assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Current assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-06-01

Abstract

The invention discloses a self-expanding bracket system which comprises a bracket, a pushing device and an introducing sheath, wherein the bracket is wrapped on part of the pushing device; the stent comprises a stent body and a membrane, wherein the membrane is wrapped on the outer wall of the stent body, the stent body is a cutting type reticular tube, the tube wall of the stent body is composed of interconnected reticular cutting lines, and the stent body is provided with one or more first openings, and the calibers of the first openings are far larger than those of meshes. The purpose of the self-expanding stent system is to solve the problems of poor adherence and compliance and incapability of recovery and re-release of the existing stent system.

Description

Self-expansion support system

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a self-expanding bracket system.

Background

Aneurysms are due to lesions or lesions of the arterial wall, forming the appearance of localized or diffuse dilatation or dilatation of the arterial wall, which after rupture can lead to hemorrhagic stroke and even sudden death. At present, the main treatment means of intracranial aneurysms are surgical clamping, balloon or stent-assisted spring coil embolization and blood flow guiding device reconstruction of a parent artery. From operation clamping to blood vessel reconstruction, the treatment of intracranial aneurysm is greatly changed from craniotomy to minimally invasive, the operation difficulty of intracranial aneurysm treatment operation is reduced, the pain of a patient is relieved, the cure rate of aneurysm is gradually improved, and the recurrence rate is gradually reduced, but the most common treatment modes of the stent auxiliary spring ring and the blood flow guiding device mainly aim at the non-ruptured aneurysmal cystic aneurysm, namely the embolization effect is poor, the risk of delayed rupture of the aneurysm exists, and the effect on ruptured aneurysm, spindle aneurysm, interbedded aneurysm, carotid cavernous sinus fistula and other intracranial arterial diseases is not obvious.

The marketed Willis tectorial membrane stent is a saccule expansion stent and can not be recovered after being released for one time; the adherence is poor, and once the non-adherence condition appears at the proximal end, the aneurysm can not heal; the compliance is poor, and the tortuosity is bent in the blood vessel.

In view of the above, it would be desirable to provide a self-expanding stent system for solving the above problems.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problems of poor adherence and compliance and incapability of recovery and re-release of the existing stent system.

(II) technical scheme

The invention provides a self-expanding stent system which comprises a stent, a pushing device and an introducing sheath, wherein the stent is wrapped on part of the pushing device; wherein the content of the first and second substances,

the stent comprises a stent body and a membrane, wherein the membrane is wrapped on the outer wall of the stent body, the stent body is a cutting type reticular tube, the tube wall of the cutting type reticular tube is composed of interconnected reticular cutting lines and is provided with one or more first openings, and the calibers of the first openings are far larger than those of meshes.

Furthermore, the reticular cutting line comprises a plurality of curve groups distributed along the length direction of the reticular cutting line, each curve group is a sine/chord curve and/or a sine/cosine-like curve which are sequentially connected along the circumferential direction of the stent body, and each curve group is connected through a plurality of connecting curves.

Further, at least one pair of adjacent connecting curves is included between two adjacent curve groups.

Furthermore, the pushing device comprises a pushing wire, a developing ring, a recovery block, an auxiliary support and a developing spring which are coaxially connected, the developing ring, the recovery block and the auxiliary support are all arranged between the pushing wire and the developing spring, and the developing ring is arranged at two ends of the recovery block and the auxiliary support; the support is wrapped on the developing ring, the recovery block and the auxiliary support.

Further, the auxiliary stent is a braided stent or a cut stent.

Further, the diameter and the length of the released auxiliary stent are both smaller than or equal to the diameter and the length of the released stent body.

Furthermore, both ends of the bracket body are in a horn mouth shape.

Further, the width of the cutting line at the two ends of the bracket body is larger than or equal to the width of the cutting line at the middle part of the bracket body.

Further, the cutting curve period of the two ends of the stent body is less than or equal to that of the middle part of the stent body.

Further, the bracket body is provided with developing marks in the circumferential direction and at the two ends of the bracket body.

(III) advantageous effects

The self-expanding stent system comprises a stent, a pushing device and an introducing sheath, wherein the stent is wrapped on part of the pushing device; the stent comprises a stent body and a membrane, wherein the membrane is wrapped on the outer wall of the stent body, the stent body is a cutting type reticular tube, the tube wall of the stent body is composed of interconnected reticular cutting lines, and the stent body is provided with one or more first openings, and the calibers of the first openings are far larger than those of meshes. The cut-type mesh structure and the first opening can make the stent body more compliant to the tortuous vessels and can pass through a smaller introducer sheath.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a self-expanding stent system provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a stent in a self-expanding stent system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating structural deployment of a stent body in a self-expanding stent system according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a pushing device in a self-expanding stent system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another pushing device in a self-expanding stent system according to an embodiment of the present invention.

In the figure:

1-a scaffold; 101-a stent body; 1011-first opening; 102-a membrane; 2-a pushing device; 201-push wire feeding; 202-developing ring; 203-recovery block; 204-an auxiliary support; 205-developing spring.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "distal" and "proximal" are used herein to be understood as viewed from the direction of the attending physician. The distal end is the side away from the attending physician, while the proximal end is towards the attending physician. In the present invention, if the phrase "axial direction" is used in this document, it should be understood to mean the direction in which the device of the invention is propelled, the direction perpendicular to the axial direction being defined as "radial".

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

According to an embodiment of the invention, the self-expanding stent system is shown in fig. 1-3, and comprises a stent 1, a pushing device 2 and an introducing sheath 3, wherein the stent 1 is wrapped on a part of the pushing device 2, the pushing device 2 and the stent 1 are both pre-installed in the introducing sheath 3, and the pushing device 2 is used for releasing or recovering the stent 1 to the introducing sheath 3; wherein the content of the first and second substances,

the stent 1 comprises a stent body 101 and a membrane 102, the membrane 102 is wrapped on the outer wall of the stent body 101, the stent body 101 is a cutting type reticular tube, the tube wall of the cutting type reticular tube is composed of interconnected reticular cutting lines, and the cutting type reticular tube is provided with one or more first openings 1011, and the calibers of the first openings 1011 are far larger than the calibers of meshes.

In the above embodiment, during the implantation, the operator pushes the pushing device 2 forward, the stent 1 is gradually released, the cut-type mesh structure and the opening of the first opening can satisfy the release → recovery → release during the release of the stent, the structural design of the stent body 101 can ensure that the stent 1 can pass through a smaller passage microcatheter, the compliance of the stent 1 to the tortuous vessels can be ensured, and the opening of the first opening 1011 helps to improve the bending performance and the compressibility of the stent body 101.

Wherein the membrane 102 is not completely fixed to the stent body 101, so as to facilitate the replacement of the membrane 102.

Optionally, the first opening 1011 is diamond-shaped or oval-shaped. The specific structure of the first opening 1011 is not limited as long as it is long and narrow, and the shape may be a diamond or oval opening with a regular specification for the sake of processing.

Specifically, as shown in fig. 3, the first opening 1011 is elongated, and the length thereof extends in the longitudinal direction of the holder body 101; when the plurality of first openings 1011 are provided, at least two openings are arranged side by side in the circumferential direction of the holder body 101. Such a specific arrangement can improve the bending property and the compressibility of the stent body 101 better.

In some alternative embodiments, as shown in fig. 3, the mesh-shaped cutting line includes a plurality of curve groups distributed along the length direction thereof, each curve group is a sine/chord curve and/or a sine/cosine-like curve sequentially connected along the circumferential direction of the stent body 101, and each curve group is connected with each other through a plurality of connecting curves.

Specifically, such a curved design enables the stent body 101 to be bent to the maximum extent, and the stent body 101 is integrally cut from a cylindrical tube or a plate, and then welded together after being rolled into a cylindrical shape by heat treatment or two or more pieces of plate are cut in pieces, and then welded together after being rolled into an arc by heat treatment.

In some optional embodiments, at least one pair of adjacent connecting curves is included between two adjacent curve groups.

The distance between a pair of adjacent connecting curves is larger than the half period length of the sine/chord curve and/or sine/cosine-like curve of any one curve group.

Specifically, such an arrangement can improve the fracture resistance of the stent body 101.

In some optional embodiments, as shown in fig. 4 to 5, the pushing device 2 includes a pushing wire 201, a developing ring 202, a recovery block 203, an auxiliary bracket 204, and a developing spring 205, which are coaxially connected, the developing ring 202, the recovery block 203, and the auxiliary bracket 204 are all disposed between the pushing wire 201 and the developing spring 205, and the developing ring 202 is disposed at both ends of the recovery block 203 and the auxiliary bracket 204; the holder 1 is wrapped around the developing ring 202, the recovery block 203, and the auxiliary holder 204.

In the above embodiment, the recovery block 203 is generally made of a silicone material, and the auxiliary stent 204 gradually expands, because of the existence of the auxiliary stent 204, when the stent 1 is difficult to open, the auxiliary stent 204 can provide a certain radial expansion force, when the stent is completely released, the introducing sheath 3 is pushed forward, the pushing device 2 can be completely recovered into the introducing sheath 3, and according to the opening condition of the stent 1, the state or the number of the auxiliary stent 204 pushing out the introducing sheath 3 is selected for assisting the sufficient wall adhesion of the region with poor wall adhesion of the stent 1.

The auxiliary stent 204 may be formed by cutting a memory alloy tube and then heat-treating, and both ends of the auxiliary stent are bound by the developing ring 202.

The stent 1 is released and recovered through mutual friction between the recovery block 203 and the introduction sheath 3, the inner wall of the stent 1 rubs the recovery block 203, and the outer wall of the stent 1 rubs the introduction sheath 3. The auxiliary support 204 at the far end of the pushing device 2 ensures that the far end of the support 1 is smoothly opened, and can adjust the opening conditions of other parts after the support 1 is integrally released, so as to ensure the adherence of the support 1.

The specific number of the recycling blocks 203 and the auxiliary supports 204 is not limited, and may be one or more, and the preferred arrangement is that the number of the recycling blocks 203 is the same as that of the auxiliary supports 204. As shown in fig. 4, when the number of the developing devices is one, the arrangement order is that both ends of the developing ring 202 and the auxiliary bracket 204 are respectively connected with the developing spring 205 and the recovery block 203 through the developing ring 202, and the other end of the recovery block 203 is connected with the push wire 201 through the developing ring 202; as shown in fig. 5, when the number of the recovery blocks is plural, the recovery blocks 203 and the auxiliary frames 204 are sequentially arranged at intervals, and the adjacent recovery blocks 203 and the auxiliary frames 204 are connected by the developing ring 202.

In some alternative embodiments, as shown in fig. 4-5, the secondary stent 204 is a braided stent or a cut stent. The specific structure of the auxiliary stent 204 is not limited as long as the auxiliary expansion of the stent 1 can be satisfied, and in a specific embodiment, a balloon expandable stent can be selected, which is a common expandable stent, and the specific structure thereof is not described herein again.

In some alternative embodiments, the diameter and length of the released auxiliary stent 204 are less than or equal to the diameter and length of the released stent body 101. Such a design requirement is to prevent the release amplitude of the auxiliary stent 204 from being too large to affect the stent body 101.

In some alternative embodiments, as shown in fig. 2, both ends of the stent body 101 are flared. The flared design ensures the adherence of the stent body 101 after implantation into a blood vessel.

In some alternative embodiments, as shown in fig. 2, the width of the cutting line at both ends of the stent body 101 is greater than or equal to the width of the cutting line at the middle portion thereof. The design is to make the cutting lines at the two ends of the stent body 101 thicker than the cutting lines at the middle part, so as to ensure the adherence of the stent body 101 after being implanted into a blood vessel. In general, when the section of the cutting line is a circle or a regular polygon, the width of the cutting line refers to its diameter.

In some alternative embodiments, the cut curve period at both ends of the stent body 101 is less than or equal to the cut curve period at the middle portion thereof. Wherein, such design is in order to guarantee the adherence after the stent body 101 is implanted into the blood vessel.

In some alternative embodiments, the stent body 101 is provided with development marks in the circumferential direction and both ends thereof.

Specifically, a plurality of developing marks are arranged on the stent body 101, so that the specific position and the complete form of the stent body 101 in a blood vessel can be identified by observing the developing marks on the stent body 101 through an imaging device, and the stent body 1 is wound with a radiopaque wire along the axis thereof so as to ensure that the stent body 101 is visible when a radiographic imaging technology is used.

It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A self-expanding stent system is characterized by comprising a stent (1), a pushing device (2) and an introducing sheath (3), wherein the stent (1) is wrapped on part of the pushing device (2), the pushing device (2) and the stent (1) are pre-installed in the introducing sheath (3), and the pushing device (2) is used for releasing or recovering the stent (1) to the introducing sheath (3); wherein the content of the first and second substances,

the support (1) comprises a support body (101) and a film (102), the film (102) is wrapped on the outer wall of the support body (101), the support body (101) is a cutting type reticular tube, the tube wall of the cutting type reticular tube is composed of interconnected reticular cutting lines, and is provided with one or more first openings (1011), and the calibers of the first openings (1011) are far larger than the calibers of meshes.

2. The self-expanding stent system according to claim 1, wherein the mesh-like cut line comprises a plurality of curve groups distributed along a length direction thereof, each curve group being a sine/chord curve and/or a sine/cosine-like curve sequentially connected in a circumferential direction of the stent body (101), the curve groups being connected to each other by a plurality of connection curves.

3. The self-expanding stent system of claim 1, wherein at least one pair of adjacent connecting curves is included between two adjacent curve groups.

4. The self-expanding bracket system according to claim 1, wherein the pushing device (2) comprises a pushing wire (201), a developing ring (202), a recovery block (203), an auxiliary bracket (204) and a developing spring (205) which are coaxially connected, the developing ring (202), the recovery block (203) and the auxiliary bracket (204) are all arranged between the pushing wire (201) and the developing spring (205), and the developing ring (202) is arranged at two ends of the recovery block (203) and the auxiliary bracket (204); the bracket (1) is wrapped on the developing ring (202), the recovery block (203) and the auxiliary bracket (204).

5. The self-expanding stent system of claim 4, wherein the secondary stent (204) is a braided stent or a cut stent.

6. The self-expanding stent system of claim 4 or 5, wherein the released diameter and length of the auxiliary stent (204) are both less than or equal to the released diameter and length of the stent body (101).

7. The self-expanding stent system according to claim 1, wherein both ends of the stent body (101) are flared.

8. The self-expanding stent system of claim 1, wherein the width of the cut line at both ends of the stent body (101) is greater than or equal to the width of the cut line in the middle portion thereof.

9. The self-expanding stent system of claim 1, wherein the cut curve period at both ends of the stent body (101) is less than or equal to the cut curve period at the middle portion thereof.

10. The self-expanding stent system according to claim 1, wherein the stent body (101) is provided with development marks in a circumferential direction and both ends thereof.