CN111870413A

CN111870413A - Stent restraint system

Info

Publication number: CN111870413A
Application number: CN202010748737.7A
Authority: CN
Inventors: 李潮
Original assignee: Beijing Yuhengjia Technology Co ltd
Current assignee: Beijing Yuhengjia Technology Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2020-11-03

Abstract

The invention provides a stent restraint system, which comprises a release assembly and a restraint assembly, wherein the release assembly comprises a release sheath and a delivery device; the restraint assembly comprises a plurality of restraint belts and restraint wires; the plurality of restraint bands are arranged in the release sheath and used for restraining the stent and can be released from a compressed state, the plurality of restraint bands are divided into at least two groups, the number of each group of restraint bands is at least one, and the circumferences of the restraint bands of different groups in the compressed state are different; the front end of the restraint wire penetrates through the release sheath and is connected with the restraint belts, the rear end of the restraint wire is connected with the conveying device, and the restraint wires are configured to control the release of the restraint belts. Through the design, the invention can realize the multi-stage constraint release functions of fully compressing, partially releasing and fully releasing the bracket, thereby realizing the full utilization of the expansion process of the bracket, facilitating the implantation of the bracket, providing safer and more effective implantation effect and being convenient for application and popularization.

Description

Stent restraint system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a stent restraint system.

Background

For the pathological changes caused by the stenosis or tumor-like expansion of the human body lumen, a stent can be placed in the lumen by an interventional therapy method so as to eliminate the stenosis or isolate the tumor-like expansion. The prior restraint system adopted for placing the stent in the lumen realizes the restraint release function of the stent by controlling the complete compression and the complete release of the stent. For stents with relatively complex structures, such as stents with branches, it may be necessary to adjust or change the diameter of the stent portion structure during the release process to achieve a satisfactory implantation result. However, the existing restraint system adopts a completely compressed and completely released restraint release method, which cannot meet the requirements.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the above-mentioned deficiencies of the prior art and to provide a stent restraint system that is capable of achieving an intermediate restraint state of the stent between full compression and full release.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to one aspect of the present invention, there is provided a stent restraining system comprising a release member and a restraining member, the release member comprising a release sheath and a delivery device; wherein the restraining component comprises a plurality of restraining belts and restraining wires; the plurality of restraint bands are arranged in the release sheath and used for restraining the stent and can be released from a compressed state, the plurality of restraint bands are divided into at least two groups, the number of the restraint bands in each group is at least one, and the circumferences of the restraint bands in different groups in the compressed state are different; the front end of the constraining wire penetrates through the releasing sheath and is connected with the plurality of constraining belts, the rear end of the constraining wire is connected with the conveying device, and the constraining wire is configured to control the release of the plurality of sets of constraining belts respectively.

According to one embodiment of the present invention, the plurality of constraining bands are respectively disposed at a plurality of constraining positions of the release sheath distributed at intervals along the axial direction, and at least one constraining band is disposed at each constraining position.

According to one embodiment of the present invention, each of the constraining positions is provided with a plurality of the constraining bands, and the constraining bands located at the same constraining position belong to different groups respectively.

According to one embodiment of the present invention, each set of constraining tapes is provided with one constraining tape at each constraining position.

According to one embodiment of the present invention, each of the restraining belts comprises a belt body and two belt loops; the band body surrounds the periphery of the bracket to restrain the bracket, and the band body is provided with two end parts; the two belt rings are respectively connected to two end parts of the belt body; the front ends of the restraint wires are respectively arranged in the belt rings of the restraint belts in a penetrating mode, and the front ends of the restraint wires are configured to control the belt body of the restraint belts to release through matching with the belt rings.

According to one embodiment of the invention, the band is arranged along a plane perpendicular to the axial direction of the release sheath.

According to one embodiment of the invention, the set of constraining bands having the longest circumference in the compressed state has a circumference equal to the circumference of the inner circumference of the release sheath in the compressed state.

According to one embodiment of the present invention, the stent restraining system comprises at least two restraining wires, and the at least two restraining wires are respectively connected to the at least two sets of restraining belts in a one-to-one correspondence manner.

According to one embodiment of the invention, the release sheath is tubular and open at the front end, and the delivery device is arranged at the rear end of the release sheath for delivering the release sheath.

According to one embodiment of the invention, the rear end of the restraining wire extends out of the conveying device and is provided with a manipulation structure.

According to the technical scheme, the constraint system provided by the invention has the advantages and positive effects that:

the stent restraint system provided by the invention comprises a plurality of restraint bands which are divided into at least two groups, and the circumferences of the restraint bands in different groups in a compressed state are different. Therefore, the invention can restrain the stent by the restraining component and bring the stent into the releasing sheath, and after the stent is delivered to a desired position by the delivery device, the stent is released from partial restraint by operating the group of restraining belts with the smallest circumference when in a compressed state to release the groups of restraining belts step by step, thereby realizing the graded release of the stent. Through the design, the invention can realize the multi-stage constraint release functions of fully compressing, partially releasing and fully releasing the bracket, thereby realizing the full utilization of the expansion process of the bracket, facilitating the implantation of the bracket, providing safer and more effective implantation effect and being convenient for application and popularization.

Drawings

Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is a schematic structural view illustrating a stent restraint system restraining a stent in accordance with an exemplary embodiment;

FIG. 2 is a partial schematic structural view of the stent restraint system shown in FIG. 1 partially releasing the stent;

FIG. 3 is a partial schematic structural view of the stent restraint system shown in FIG. 1 fully releasing the stent.

The reference numerals are explained below:

110. a release sheath;

120. a conveying device;

130. a first restraint band;

131. a belt body;

132. a belt ring;

140. a second restraint band;

150. a restraining wire;

160 a steering mechanism;

200. and (4) a bracket.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are accordingly to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the invention.

Referring to fig. 1, a schematic structural view of a stent constrained by the proposed stent constraint system is representatively shown, and a part of the structure (release sheath) is shown in perspective to show the internal constraint components and the stent. In this exemplary embodiment, the stent restraining system proposed by the present invention is illustrated by way of example as applied to a restraining system for restraining, delivering and releasing a stent prosthesis vessel. Those skilled in the art will readily appreciate that various modifications, additions, substitutions, deletions, or other changes may be made to the embodiments described below in order to apply the inventive concepts to the restraint, release of other types of stents, and still remain within the principles of the stent restraint system set forth herein.

As shown in fig. 1, in the present embodiment, the stent restraining system proposed by the present invention comprises a releasing component and a restraining component, wherein the releasing component comprises a releasing sheath 110 and a delivery device 120. Referring to fig. 2 and 3 in combination, fig. 2 representatively illustrates a partial schematic view of a stent restraint system partially releasing the stent 200; a partial schematic structural view of the stent restraint system fully releasing the stent 200 is representatively illustrated in fig. 3. The structure, connection and functional relationship of the main components of the stent restraint system proposed by the present invention will be described in detail below with reference to the above drawings.

As shown in fig. 1 to 3, in the present embodiment, the constraining assembly includes a plurality of constraining tapes and constraining wires 150. Specifically, a plurality of constraining bands are disposed within the release sheath 110 that are capable of constraining the stent 200 and being released from a compressed state, i.e., the circumference of a constraining band in a compressed state determines the circumference of the stent 200 when constrained by the constraining band. Since the constraining tapes are not closed and both ends of the constraining tapes are substantially adjacent to each other when constraining the stent 200, and the common constraining wire 150 is inserted, the perimeter of the constraining tapes can be understood as the length of the constraining tapes. The plurality of restraint belts are divided into two groups, and the number of each group of restraint belts is multiple. For convenience of explanation, the two sets of constraining tapes are defined as a first constraining tape 130 and a second constraining tape 140, respectively, in the present embodiment. The first and second constraining

tapes

130, 140 have different perimeters when compressed, and in this embodiment the first constraining tape 130 is defined to have a smaller perimeter when compressed than the second constraining tape 140. The front end of the constraining wire 150 is inserted into the releasing sheath 110 and connected to a plurality of constraining bands (both ends of each constraining band), the rear end of the constraining wire 150 is connected to the conveying device 120, and the constraining wire 150 has certain rigidity and can control the release of a plurality of sets of constraining bands respectively.

In other embodiments, the constraining assembly may also include three or more sets of constraining bands, and the perimeter of each set of constraining bands in the compressed state is different. Furthermore, the number of the constraining tapes included in each set of constraining tapes may be one or more than one. That is, to satisfy the basic design concept of the proposed stent restraining system, in various possible embodiments of the present invention, the restraining assembly of the proposed stent restraining system comprises a plurality of restraining bands and restraining wires 150. A plurality of constraining bands are disposed within the delivery sheath 110 to constrain the stent 200 and to enable release from the compressed state. The plurality of constraining belts are divided into at least two groups, the number of constraining belts in each group is at least one, and the circumferences of the constraining belts in the compressed state in different groups are different. The front end of the constraining wire 150 is inserted into the releasing sheath 110 and connected with the plurality of constraining bands, the rear end is connected to the delivery device 120, and the constraining wire 150 is configured to control the release of the plurality of sets of constraining bands respectively. Through the design, the stent restraint system provided by the invention can realize the multi-stage restraint release functions of fully compressing, partially releasing and fully releasing the stent 200, so that the expansion process of the stent 200 is fully utilized, the stent 200 is conveniently placed, a safer and more effective placing effect is provided, and the application and popularization are facilitated.

It should be noted that, based on the design that the constraining assembly comprises two sets of constraining tapes, and the circumference of the first constraining tape 130 in the compressed state is smaller than that of the second constraining tape 140, in the present embodiment, the first constraining tape 130 can be regarded as a full constraining tape, i.e., the stent 200 can be completely constrained by the full constraining tape, and the constraint of the stent 200 by the full constraining tape can be included in the delivery process of the stent 200 to the desired position through the stent constraining system. Furthermore, the second constraining band 140 can be regarded as a second full constraining band, that is, the present invention can release the stent 200 to a certain extent through the second full constraining band, and when the stent 200 is not completely released, perform a secondary constraint (incomplete constraint) on the stent 200, and the constraint of the second full constraining band on the stent 200 can be included in each stage of the release process of the stent 200 at the desired position.

Preferably, as shown in fig. 1 to 3, the plurality of first constraining belts 130 are respectively disposed at a plurality of constraining positions of the releasing sheath 110 distributed at intervals in the axial direction, the plurality of second constraining belts 140 are respectively disposed at a plurality of constraining positions of the releasing sheath 110 distributed at intervals in the axial direction, and the plurality of constraining positions at which the second constraining belts 140 are disposed are respectively the same as the plurality of constraining positions at which the plurality of first constraining belts 130 are disposed. That is, for each restraining location, one first restraining strip 130 and one second restraining strip 140 are disposed therein. It should be noted that the above-mentioned constraining position may be understood as a section of the axial direction of the releasing sheath 110, that is, when a plurality of constraining tapes are provided at one constraining position, taking a constraining position provided with one first constraining tape 130 and one second constraining tape 140 as an example, the first constraining tape 130 and the second constraining tape 140 at the constraining position may preferably keep a certain gap in the axial direction of the releasing sheath 110, that is, the two constraining tapes do not completely coincide, so as to facilitate the arrangement of the plurality of constraining tapes at the same constraining position.

In other embodiments, a plurality of constraining bands are provided at a plurality of axially spaced constraining locations, respectively, of the release sheath 110, with at least one constraining band provided at each constraining location. On the basis, a plurality of restraint belts in the same group can be arranged at each restraint position, or can be arranged at partial restraint positions according to requirements, and are not arranged at other positions. In addition, for a group of restraining belts including a plurality of restraining belts, the same group of restraining belts may be disposed at a plurality of restraining positions respectively in the same number, for example, a certain group of restraining belts includes five restraining belts, and the number of restraining positions is five, so that each restraining position may be disposed with one restraining belt of the group. Also, when a plurality of restraining bands are provided for each restraining position, the plurality of restraining bands located at the same restraining position may respectively belong to different groups, that is, for each restraining position, the number of restraining bands of a group provided at the restraining position is not more than one. In addition, when a plurality of constraining tapes in the same group are disposed at a plurality of constraining positions (where the number of the "plurality" is different from the number of the "plurality"), the number of the constraining tapes in the group at each constraining position may not be completely the same or may be completely different. Bearing on, according to the restraint, release and transport needs to support 200, the distribution form of the multiple groups of restraint belts on the multiple restraint positions can be flexibly adjusted, all without being limited by the embodiment.

Preferably, as shown in fig. 1 to 3, in the present embodiment, each restraining band may preferably include a band body 131 and two band rings 132. Specifically, the band 131 surrounds the outer circumference of the bracket 200 and can be fixed to the bracket 200, and the band 131 is used to restrain the bracket 200. The band body 131 has two end portions, and the two band rings 132 are respectively connected to the two end portions of the band body 131. The circumference of the constraining tape in the compressed state is substantially equal to the length of the tape body 131. On this basis, the front ends of the constraining wires 150 are respectively inserted into the belt rings 132 of the plurality of constraining belts, and the release of the belt body 131 of the constraining belts can be controlled by matching with the belt rings 132.

Further, based on the design that the constraining band comprises the band body 131 and the two band rings 132, in the present embodiment, the band body 131 may preferably be substantially arranged along a plane when constrained at the outer circumference of the stent 200, and the plane may preferably be perpendicular to the axial direction of the release sheath 110.

Preferably, in this embodiment, the circumference of the first constraining band 130 in the compressed state may preferably match (e.g., slightly smaller than or equal to) the circumference of the inner circumference of the releasing sheath 110, i.e., the inner circumference of the releasing sheath 110 may be understood as the inner circumference of a cross-section taken along the radial direction of the releasing sheath 110. That is, the radius of the approximately corresponding circumference of the first constraining band 130 in the compressed state matches (e.g., is slightly less than or equal to) the radius of the inner circumference of the release sheath 110. In other embodiments, when the plurality of constraining bands comprises more than two sets of constraining bands, the smallest circumference of the set of constraining bands in the compressed state may preferably match (e.g., be slightly less than or equal to) the circumference of the inner circumference of the release sheath 110.

Preferably, in this embodiment, the stent restraining system proposed by the present invention may preferably comprise two restraining wires 150. Specifically, the two constraining wires 150 are connected to the two sets of constraining tapes in a one-to-one correspondence, respectively. One of the restraining wires 150 is connected to the strap loop 132 of each first restraining strap 130, and the other restraining wire 150 is connected to the strap loop 132 of each second restraining strap 140. In other embodiments, when the stent constraining system of the present invention comprises two or more sets of constraining tapes, the releasing element may also comprise more than two constraining wires 150, and each set of constraining tapes is connected to and controlled to be released from the compressed state by at least one constraining wire 150.

Preferably, as shown in fig. 1, in the present embodiment, the releasing sheath 110 may preferably be a tubular structure with an open front end, and the delivery device 120 is disposed at the rear end of the releasing sheath 110 for delivering the releasing sheath 110.

Preferably, as shown in fig. 1, in the present embodiment, the rear end of the constraining wire 150 protrudes out of the delivery device 120 and may be preferably provided with a manipulating structure 160. Accordingly, an operator may manipulate the restraining wire 150 via the manipulation structure 160 and through the engagement of the restraining wire 150 with the strap loops 132 of each set of restraining straps, thereby providing a multi-stage restraint release function for the stent 200 via the restraining straps.

It should be noted herein that the stent restraint systems illustrated in the drawings and described in the present specification are but a few examples of the wide variety of stent restraint systems that the principles of the present invention can be employed in. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the stent restraint system or any of the components of the stent restraint system shown in the drawings or described in this specification.

For example, in the present embodiment, the front opening of the releasing sheath 110 may be preferably provided with a protective guide head, the front end of which may be in a circular arc shape, a conical shape, a spindle shape, etc. to protect the tissue on the moving path from being damaged by the plane of the front opening of the releasing sheath 110 during the process of being implanted and moving to the desired position along with the releasing sheath 110, and at the same time, to provide a guiding function for the advancing of the releasing sheath 110.

Based on the above detailed description of an exemplary embodiment of the stent restraint system proposed by the present invention, a method of using the stent restraint system will be described below.

As shown in fig. 1 to 3, the plurality of constraining tapes in the above-described embodiments include a first constraining tape 130 and a second constraining tape 140 as an example. First, the stent 200 to be placed is constrained in a fully compressed state by the plurality of first constraining bands 130. At this time, the plurality of second constraining belts 140 are also sleeved on the periphery of the stent 200 which is completely compressed, and since the perimeter of the second constraining belts 140 is larger than that of the first constraining belts 130, the second constraining belts 140 do not generate compression constraint effect on the stent 200 in this state. Then, the releasing sheath 110 is placed at a desired position, the releasing sheath 110 is removed, the stent 200 in the completely compressed state of the two sets of constraining wires 150 is extended relative to the releasing sheath 110 during the removing process, i.e., is left at the desired position, one constraining wire 150 is manipulated by the manipulating structure 160, the first constraining band 130 is released by the cooperation of the constraining wire 150 and the first constraining band 130, so that the stent 200 is released from the completely compressed state and is constrained by the second constraining band 140 to be in the incompletely compressed state during the releasing process. Finally, another constraining filament 150 is manipulated by the manipulation structure 160, releasing the second constraining band 140 using the cooperation of the constraining filament 150 with the second constraining band 140, such that the stent 200 is fully released from the incompletely compressed state.

In summary, the stent constraining system provided by the present invention comprises a plurality of constraining bands divided into at least two groups, and the constraining bands of different groups have different circumferences when in a compressed state. Therefore, the invention can restrain the stent by the restraining component and bring the stent into the releasing sheath, and after the stent is delivered to a desired position by the delivery device, the stent is released from partial restraint by operating the group of restraining belts with the smallest circumference when in a compressed state to release the groups of restraining belts step by step, thereby realizing the graded release of the stent. Through the design, the invention can realize the multi-stage constraint release functions of fully compressing, partially releasing and fully releasing the bracket, thereby realizing the full utilization of the expansion process of the bracket, facilitating the implantation of the bracket, providing safer and more effective implantation effect and being convenient for application and popularization.

Exemplary embodiments of the stent restraint system proposed by the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.

While the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

Claims

1. A stent constraining system comprising a release assembly and a constraining assembly, the release assembly comprising a release sheath and a delivery device, the constraining assembly comprising:

the plurality of restraint bands are arranged in the release sheath and used for restraining the stent and can be released from a compressed state, the plurality of restraint bands are divided into at least two groups, the number of the restraint bands in each group is at least one, and the circumferences of the restraint bands in different groups in the compressed state are different; and

and the front end of the constraining wire is arranged in the releasing sheath in a penetrating way and is connected with the plurality of constraining belts, the rear end of the constraining wire is connected with the conveying device, and the constraining wire is configured to control the release of the plurality of groups of constraining belts respectively.

2. The stent restraint system of claim 1, wherein the plurality of restraining strips are respectively disposed at a plurality of axially spaced restraining locations of the release sheath, each restraining location being disposed with at least one of the restraining strips.

3. The stent restraint system of claim 2, wherein each of the restraint locations is provided with a plurality of the restraint bands, the plurality of restraint bands located at the same restraint location belonging to different groups, respectively.

4. The stent restraint system of claim 3, wherein each set of the restraint bands is provided with one of the restraint bands at each of the restraining locations.

5. The stent restraint system of claim 1, wherein each of the restraint bands comprises:

a band surrounding the outer circumference of the bracket to restrain the bracket, the band having two ends; and

two belt rings respectively connected to two ends of the belt body;

the front ends of the restraint wires are respectively arranged in the belt rings of the restraint belts in a penetrating mode, and the front ends of the restraint wires are configured to control the belt body of the restraint belts to release through matching with the belt rings.

6. The stent restraint system of claim 5, wherein the band is disposed along a plane that is perpendicular to an axial direction of the release sheath.

7. The stent restraint system of claim 1, wherein a group of the restraint bands having a shortest circumference in a compressed state has a circumference in the compressed state equal to a circumference of an inner circumference of the release sheath.

8. The stent restraint system of claim 1, wherein the stent restraint system comprises at least two of the restraining wires, each of the at least two restraining wires being connected to the at least two sets of restraining strips in a one-to-one correspondence.

9. The stent restraint system of claim 1 wherein the release sheath is tubular in configuration and open at a forward end, and the delivery device is disposed at a rearward end of the release sheath for delivery of the release sheath.

10. The stent restraint system of claim 9, wherein the restraining wire rear end extends out of the delivery device and is provided with a manipulation structure.