CN106618819B

CN106618819B - Blood vessel stent and stent component

Info

Publication number: CN106618819B
Application number: CN201710019302.7A
Authority: CN
Inventors: 姜志胜; 李国华; 张耀元; 黄文晖; 刘录山
Original assignee: Nanhua University
Current assignee: Nanhua University
Priority date: 2017-01-11
Filing date: 2017-01-11
Publication date: 2021-07-30
Anticipated expiration: 2037-01-11
Also published as: CN106618819A

Abstract

The utility model provides a vascular support and bracket component, belongs to the medical apparatus field, and vascular support includes first support unit, second support unit and first connecting piece, and first support unit and second support unit are connected through first connecting piece, and second support unit can be accomodate in first support unit through first connecting piece elastic deformation. The stent component comprises the vascular stent. The intravascular stent can expand radially and stretch axially, and even if a diseased blood vessel is longer, multiple times of segmented implantation are not needed, so that the operation time is shortened, the operation risk is reduced, the simplicity of the operation is improved, the incidence of postoperative restenosis is reduced, and the treatment effect of diseases is improved. The bracket component can implant the vascular bracket in a long pathological change blood vessel efficiently and concisely without multiple segmented implantation, and has the characteristics of short operation time, low risk and good effect.

Description

Blood vessel stent and stent component

Technical Field

The invention relates to the field of medical instruments, in particular to a vascular stent and a stent component.

Background

The medical stent is one of common medical instruments, can be implanted into a diseased blood vessel to prop open the diseased blood vessel so as to ensure that blood flows smoothly, and is commonly used for treating angiostenosis and repairing and reconstructing the blood vessel.

However, the existing vessel stent can only be expanded in the radial direction, and cannot be lengthened in the axial direction. When the diseased blood vessel is long, the diseased blood vessel must be implanted for multiple times and in sections, which not only increases the risk of the operation, but also increases the incidence of restenosis after the operation, thereby affecting the simplicity of the operation and the treatment effect of the disease.

Disclosure of Invention

The invention aims to provide a blood vessel support which can not only radially expand but also axially extend, and even if a diseased blood vessel is longer, the blood vessel support does not need to be implanted in a segmented mode for many times, so that the operation time is shortened, the operation risk is reduced, the simplicity of the operation is improved, the incidence rate of postoperative restenosis is reduced, and the treatment effect of diseases is improved.

Another object of the present invention is to provide a stent assembly, which can implant a vascular stent into a long diseased vessel efficiently and simply without multiple segmental implants, and has the characteristics of short operation time, low risk and good effect.

The embodiment of the invention is realized by the following steps:

a blood vessel support comprises a first support unit, a second support unit and a first connecting piece, wherein the first support unit is connected with the second support unit through the first connecting piece, and the second support unit can be elastically deformed and stored in the first support unit through the first connecting piece.

Further, in a preferred embodiment of the invention, the first connecting member is a connecting strip, and two ends of the connecting strip are respectively connected to the first bracket unit and the second bracket unit.

Further, in a preferred embodiment of the invention, the connecting strips are provided in plural and are arranged at intervals in a circumferential direction of the first stent unit or the second stent unit.

Further, in a preferred embodiment of the present invention, the connecting bar is made of a memory alloy material.

Further, in a preferred embodiment of the present invention, the connecting bar is made of nitinol.

Further, in a preferred embodiment of the present invention, the first support unit is of an annular structure and is formed by sequentially connecting a plurality of first support bars end to end, the second support unit is of an annular structure and is formed by sequentially connecting a plurality of second support bars end to end, and the diameters of the first support unit and the second support unit are equal.

Further, in a preferred embodiment of the invention, the length of the first brace bar is less than the length of the second brace bar.

Further, in a preferred embodiment of the present invention, the blood vessel stent includes a third stent unit, a fourth stent unit, a second connecting member and a third connecting member, the third stent unit and the second stent unit are connected by the second connecting member, the third stent unit and the fourth stent unit are connected by the third connecting member, and the fourth stent unit can be elastically deformed by the third connecting member and accommodated in the third stent unit.

A stent implantation method based on the vascular stent comprises the following steps: compressing the blood vessel stent to enable the second stent unit to be accommodated in the area surrounded by the first stent unit; pushing the compressed vascular stent to the vascular lesion; and releasing the blood vessel stent to enable the second stent unit to extend out of the first stent unit.

A stent component comprises a sleeve, a guide rod and the blood vessel stent, wherein the sleeve and the guide rod can be matched with each other to form a compression cavity for compressing the blood vessel stent.

The embodiment of the invention has the beneficial effects that:

this blood vessel support includes first support element, second support element and first connecting piece, first support element and second support element pass through first connecting piece and connect, second support element can be accomodate in first support element through first connecting piece elastic deformation, it can radial expansion not only, can also axial elongation, even pathological change blood vessel is longer, also need not many times segmentation and implant, thereby shorten operation time, reduce the operation risk, improve the succinct nature of operation, reduce postoperative restenosis's incidence, improve the treatment of disease, the defect of current blood vessel support has effectively been remedied.

The bracket component comprises the intravascular stent, can implant the intravascular stent in a longer pathological change blood vessel efficiently and concisely, does not need to be implanted in a multi-stage manner, has the characteristics of short operation time, low risk and good effect, and effectively makes up the defects of the existing bracket component.

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 will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a blood vessel stent provided by an embodiment of the invention in a deployment state;

FIG. 2 is a schematic structural diagram of a stent in a compressed state according to an embodiment of the present invention;

fig. 3-6 are schematic views illustrating the operation of the bracket assembly according to the embodiment of the present invention.

Icon: 100-a vascular stent; 110-a first rack unit; 112-a first brace bar; 120-a second rack unit; 122-a second stent strip; 130-a third rack unit; 132-a third scaffold strip; 140-a fourth rack unit; 142-a fourth stent strip; 150-a first connector; 160-a second connector; 170-a third connector; 200-a rack assembly; 210-a cannula; 220-a guide rod; 300-diseased vessel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention 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 present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the 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 invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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.

Referring to fig. 1-2, the present embodiment provides a blood vessel stent 100, which is mainly used for opening a diseased blood vessel to make blood flow smoothly, so as to treat stenosis of the blood vessel, repair and reconstruct the blood vessel. The present stent 100 includes a first stent unit 110, a second stent unit 120, a third stent unit 130, a fourth stent unit 140, a first connector 150, a second connector 160, and a third connector 170.

Among them, the first stent unit 110, the second stent unit 120, the third stent unit 130, and the fourth stent unit 140 may take various structures and forms as long as they can support a blood vessel. In this embodiment, the first support unit 110 is an annular structure formed by sequentially connecting a plurality of first support bars 112 end to end, the second support unit 120 is an annular structure formed by sequentially connecting a plurality of second support bars 122 end to end, the third support unit 130 is an annular structure formed by sequentially connecting a plurality of third support bars 132 end to end, the fourth support unit 140 is an annular structure formed by sequentially connecting a plurality of fourth support bars 142 end to end, the axes of the four support units are approximately overlapped, and the diameters of the four support units are equal.

In this embodiment, the first, second, third and

fourth brace bars

112, 122, 132 and 142 may take various structures and forms, such as U-shape, V-shape, wave-shape, X-shape, etc.

In this embodiment, the cross-sectional areas of the first rack unit 110, the second rack unit 120, the third rack unit 130, and the fourth rack unit 140 are substantially equal, and the cross-sectional areas refer to planes perpendicular to the lengthwise direction of the first rack bar 112, the second rack bar 122, the third rack bar 132, and the fourth rack bar 142. The purpose of this arrangement is to make the first stent unit 110, the second stent unit 120, the third stent unit 130 and the fourth stent unit 140 have almost the same pressure-bearing capacity when the blood vessel stent 100 is in the expanded state, thereby ensuring the effective support of the blood vessel stent 100 to the blood vessel wall.

Further, in the present embodiment, the length of the first rack bar 112 is smaller than that of the second rack bar 122, the length of the third rack bar 132 is smaller than that of the fourth rack bar 142, and when the four rack units are in the contracted state, the distance between two adjacent first rack bars 112 is larger than that between two adjacent second rack bars 122, and the distance between two adjacent third rack bars 132 is larger than that between two adjacent fourth rack bars 142. Thus, when the blood vessel stent 100 is in a compressed state, the diameter of the second stent unit 120 is slightly smaller than that of the first stent unit 110 so as to be receivable in the first stent unit 110, the diameter of the fourth stent unit 140 is slightly smaller than that of the third stent unit 130 so as to be receivable in the third stent unit 130, and when the blood vessel stent 100 is in a released state, the diameters of the first stent unit 110, the second stent unit 120, the third stent unit 130 and the fourth stent unit 140 are substantially the same, so that the blood vessel wall characteristics can be well adapted.

The first connector 150, the second connector 160, and the third connector 170 may take various structures and forms, and in this embodiment, the first connector 150, the second connector 160, and the third connector 170 each include a plurality of connecting bars.

The connecting strip can be made of various materials as long as the connecting strip has excellent elastic performance, can deform under the action of external force and can restore to the original shape after the external force disappears. In this embodiment, the plurality of connecting strips are all made of nickel-titanium alloy. Nitinol is a shape memory alloy that has excellent chemical stability and biocompatibility, and is well suited for use as a raw material for connectors in the present vascular stent 100. Meanwhile, the surfaces of the connecting strips and the four bracket units can be provided with medicine coatings according to actual requirements.

Of course, it should be noted that, in other embodiments, the connecting strip may also be made of other materials, such as memory alloy, medical stainless steel, etc., which are determined according to actual needs and situations.

The first bracket unit 110 and the second bracket unit 120 are connected by a first connecting member 150, a plurality of connecting strips constituting the first connecting member 150 are arranged at intervals along the circumferential direction of the first bracket unit 110 or the second bracket unit 120, and both ends of each connecting strip are respectively fixedly connected with the first bracket unit 110 and the second bracket unit 120.

The second bracket unit 120 and the third bracket unit 130 are connected by a second connecting member 160, and a plurality of connecting strips constituting the second connecting member 160 are arranged at intervals along the circumferential direction of the second bracket unit 120 or the third bracket unit 130, and both ends of each connecting strip are respectively fixedly connected with the second bracket unit 120 and the third bracket unit 130.

The third stent unit 130 and the fourth stent unit 140 are connected by a third connecting member 170, and a plurality of connecting strips constituting the third connecting member 170 are arranged at intervals along the circumferential direction of the third stent unit 130 or the fourth stent unit 140, and both ends of each connecting strip are respectively fixedly connected with the third stent unit 130 and the fourth stent unit 140.

The second rack unit 120 can be elastically deformed by the first connector 150 and received in the first rack unit 110, the second rack unit and the third rack unit can be elastically deformed by the second connector 160 and moved closer to or farther away from each other, and the fourth rack unit 140 can be elastically deformed by the third connector 170 and received in the third rack unit 130.

It should be noted that the first connector 150 and the third connector 170 are used to enable the second stent unit 120 and the fourth stent unit 140 to be respectively accommodated in the first stent unit 110 and the third stent unit 130 when the blood vessel stent 100 is in the compressed state, and to be used to respectively connect the second stent unit 120 and the fourth stent unit 140 when the blood vessel stent 100 is in the expanded state, and to support the blood vessel. The second connector 160 serves to connect the second stent unit 120 and the third stent unit 130 while serving to support a blood vessel.

The working principle and process of the present vascular stent 100 are as follows: before entering a blood vessel, the blood vessel stent 100 is limited to be in a compressed state, at the moment, the first connecting piece 150, the second connecting piece 160 and the third connecting piece 170 are all in an elastic deformation state, the second stent unit 120 is accommodated in an area surrounded by the first stent unit 110, the second stent unit 120 and the third stent unit 130 are closely attached to each other, and the fourth stent unit 140 is accommodated in an area surrounded by the third stent unit 130; pushing the vascular stent 100 to the intravascular lesion; the vessel stent 100 is released to be in a deployed state, at this time, the first connecting piece 150, the second connecting piece 160 and the third connecting piece 170 all return to the initial state, the second stent unit 120 extends from the first stent unit 110, the third stent unit 130 is far away from the second stent unit 120, the fourth stent unit 140 extends from the third stent unit 130, the first stent unit 110, the second stent unit 120, the third stent unit 130 and the fourth stent unit 140 are sequentially arranged at intervals along the axial direction, and the whole vessel stent 100 is elongated and radially expanded, so that effective support of a vessel lesion is realized.

In summary, the vessel stent 100 includes a first stent unit 110, a second stent unit 120 and a first connecting member 150, the first stent unit 110 and the second stent unit 120 are connected by the first connecting member 150, and the second stent unit 120 can be elastically deformed and accommodated in the first stent unit 110 by the first connecting member 150, and can expand radially and expand axially (practice proves that under the condition that the length of the expanded state is the same, the length of the expanded state can be compressed to be one half to two thirds of that of the existing vessel stent), even if the diseased vessel is long, multiple segmental implantation is not needed, thereby shortening the operation time, reducing the operation risk, improving the simplicity of the operation, reducing the incidence rate of postoperative restenosis, improving the treatment effect of diseases, and effectively making up for the defects of the existing vessel stent 100.

Finally, the number of stent units of the stent 100 may vary according to the length of the diseased vessel, for example, the third stent unit 130 and the fourth stent unit 140 may be omitted, or two more stent units may be added (for example, the fifth stent unit and the sixth stent unit may be added).

The embodiment provides a stent assembly 200, which comprises a sleeve 210, a guide rod 220 and the vascular stent 100, wherein an annular stopper is arranged on the inner wall of the sleeve 210, a disc stopper matched with the inner diameter of the sleeve 210 is arranged at one end of the guide rod 220, the inner wall of the sleeve 210, the annular stopper, the outer wall of the guide rod 220 and the disc stopper can jointly enclose a compression cavity for compressing the vascular stent 100, and the compression cavity is approximately in a circular tube shape.

The working principle and process of the present bracket assembly 200 is as follows: before entering the diseased vessel 300, the guide rod 220 penetrates the sleeve 210, so that the inner wall of the sleeve 210, the annular stopper, the outer wall of the guide rod 220 and the disc stopper can together enclose a tubular compression cavity, the stent 100 is accommodated in the compression cavity and is in a compressed shape, one end of the stent 100 abuts against the annular stopper and the other end abuts against the disc stopper (see fig. 3), then the stent 100 in the compressed state is sent into the diseased vessel 300 through the sleeve 210 and the guide rod 220 and reaches the diseased site, then the sleeve 210 is pulled backwards, so that the end part of the sleeve 210 is gradually far away from the disc stopper of the guide rod 220, and the stent 100 loses the limitation of the inner wall of the sleeve 210, the annular stopper and the disc stopper, thereby gradually releasing the axial compression state, the axial extension (see fig. 4), then gradually releasing the radial compression state and the radial expansion (see fig. 5), eventually fully expanding to support the diseased vessel (see fig. 6).

To sum up, the stent assembly 200 comprises the vascular stent 100, and the vascular stent 100 can be implanted into a long diseased blood vessel 300 efficiently and simply without multiple segmented implantation, so that the stent assembly has the characteristics of short operation time, low risk and good effect, and effectively overcomes the defects of the existing stent assembly 200.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vascular stent is characterized by comprising a first stent unit, a second stent unit and a first connecting piece, wherein the first stent unit and the second stent unit are connected through the first connecting piece, when the vascular stent is limited, the first connecting piece is elastically deformed, the second stent unit is accommodated in the first stent unit, the vascular stent is in a radial compression state, when the vascular stent is released, the second stent unit extends out of the first stent unit, the vascular stent is in an expansion state, the vascular stent is extended and radially expanded, the first stent unit is in an annular structure and is formed by sequentially connecting a plurality of first stent strips end to end, the second stent unit is in an annular structure and is formed by sequentially connecting a plurality of second stent strips end to end, when the vascular stent is in a release state, the diameters of the first stent unit and the second stent unit are equal, the length of the first brace bar is less than the length of the second brace bar.

2. The vessel support according to claim 1, wherein the first connecting member is a connecting strip, and both ends of the connecting strip are connected to the first support unit and the second support unit, respectively.

3. The vascular stent of claim 2, wherein the connecting strips are provided in plural numbers and are spaced apart in a circumferential direction of the first stent unit or the second stent unit.

4. The vascular stent of claim 2 or 3, wherein the connecting strips are made of memory alloy.

5. The vascular stent of claim 4, wherein the connecting strips are of nitinol.

6. The vessel stent of claim 1, wherein the vessel stent comprises a third stent unit, a fourth stent unit, a second connecting piece and a third connecting piece, wherein the third stent unit is connected with the second stent unit through the second connecting piece, the third stent unit is connected with the fourth stent unit through the third connecting piece, and the fourth stent unit can be elastically deformed and accommodated in the third stent unit through the third connecting piece.

7. A stent assembly comprising a sleeve, a guide rod, and the vascular stent of any of claims 1-6, wherein the sleeve and the guide rod are capable of cooperating to form a compression chamber for compressing the vascular stent.