Peripheral vascular stent

Abstract

The utility model provides a peripheral vascular stent which comprises a plurality of first corrugated elastic rings and a plurality of second corrugated elastic rings, and the first corrugated elastic rings and the second corrugated elastic rings are sequentially arranged in a crossed mode. Each wave trough of the first corrugated elastic ring is connected with each wave crest of the second corrugated elastic ring on one side of the first corrugated elastic ring through a plurality of rigid connecting pieces in a one-to-one correspondence manner; each wave crest of the first corrugated elastic ring is connected with each wave trough of the second corrugated elastic ring on the other side of the first corrugated elastic ring through a flexible connecting piece in a one-to-one correspondence manner; the rigid connecting pieces between the adjacent first corrugated elastic rings and the second corrugated elastic rings are sequentially connected through tension pull wires to form tension rings. The tension ring has a first tension diameter and a second tension diameter greater than the first tension diameter. The peripheral vascular stent provided by the utility model can provide a solution to the restenosis problem after a peripheral stent interventional operation, so that the peripheral stent interventional operation effect is improved, and the psychological burden of a patient is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a peripheral blood vessel stent. BACKGROUND

[0002] Lower extremity arteriosclerosis obliterans is a common vascular disease, which usually needs to implant a peripheral stent into a blood vessel occlusion position to dilate the blood vessel by using an interventional operation. There is still a risk of in-stent restenosis occlusion after implanting the peripheral stent into the blood vessel, but the same blood vessel position cannot be implanted with a peripheral stent again, which causes a great psychological burden to patients who undergo a peripheral stent interventional operation, so the industry has been committed to researching a technology capable of solving the problem of in-stent restenosis. SUMMARY

[0003] The utility model embodiment provides a peripheral blood vessel stent, aims at solving the problem of postoperative restenosis of the peripheral stent implantation position, and improves the effect of peripheral stent interventional operation.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a peripheral blood vessel stent, which comprises a plurality of first corrugated elastic rings and a plurality of second corrugated elastic rings, each first corrugated elastic ring and each second corrugated elastic ring are arranged in turn; each trough of the first corrugated elastic ring and each peak of the second corrugated elastic ring on one side thereof are connected in one-to-one correspondence through a plurality of rigid connecting pieces, and each peak of the first corrugated elastic ring and each trough of the second corrugated elastic ring on the other side thereof are connected in one-to-one correspondence through a flexible connecting piece; wherein each rigid connecting piece between adjacent first corrugated elastic rings and second corrugated elastic rings is connected in turn to form a tension ring through a tension cable; the tension ring has a first tension diameter and a second tension diameter greater than the first tension diameter.

[0005] In a possible implementation manner, the rigid connecting piece comprises a connecting body, one end of the connecting body is fixedly connected with the trough of the first corrugated elastic ring, and the other end is fixedly connected with the peak of the second corrugated elastic ring; the inside of the connecting body has a receiving cavity suitable for the tension cable to pass into.

[0006] In some embodiments, the two ends of the tension cable are respectively provided with a first joint and a second joint, and the first joint of each tension cable and the second joint of the adjacent tension cable are adapted to form a plug-in fit in the same receiving cavity.

[0007] For example, one end of the receiving cavity forms a female interface, and the other end forms a male joint suitable for plug-in fit with the female interface, and the female interface and the male joint both have a perforation suitable for the tension cable to pass through to extend into the receiving cavity.

[0008] For example, the flexible connector includes a first connector, a second connector, and a plurality of hollow bladders stacked between the first connector and the second connector; the first connector is connected to the crest of the first corrugated elastic ring, and the second connector is connected to the trough of the second corrugated elastic ring.

[0009] In some embodiments, the hollow bladders are connected in sequence, and an annular groove is formed between adjacent hollow bladders.

[0010] For example, the cavity is filled with an antiproliferative drug.

[0011] For example, both the first and second corrugated elastic rings have a drug coating on their surfaces.

[0012] The beneficial effects of the peripheral vascular stent provided by this utility model are as follows: Compared with the prior art, the peripheral vascular stent of this utility model adopts a method in which the first corrugated elastic ring and the second corrugated elastic ring are connected in sequence through a rigid connector and a flexible connector. This allows the rigid connector to enhance the axial offset support force between the first and second corrugated elastic rings, while the flexible connector ensures that the first and second corrugated elastic rings have bending deformation capability. Furthermore, after implantation at the vascular occlusion site, the rigid connectors connected in sequence through tension wires are first expanded to form a first tension diameter. The tension ring expands the occluded blood vessel. Because the tension ring can form a circumferential tension constraint on the first and second corrugated elastic rings, it can release the tension wire a second time when restenosis occurs at the current blood vessel location. This expands the tension ring from the first tension diameter to the second tension diameter, and further expands the first and second corrugated elastic rings on the original basis. This can further expand and unblock the restenotic blood vessel, providing a solution to the restenosis problem after peripheral stent intervention, improving the effect of peripheral stent intervention, and eliminating the psychological burden on patients. Attached Figure Description

[0013] Figure 1 A schematic diagram of the unfolded structure of the peripheral vascular stent provided in an embodiment of this utility model;

[0014] Figure 2 The peripheral vascular stent provided in this embodiment of the invention, in its initial contracted state and in its expanded states to the first and second tension diameters respectively, along... Figure 1 Schematic diagram of the cross-sectional structure of the middle AA line;

[0015] Figure 3 for Figure 2 Enlarged structural diagram at point B;

[0016] Figure 4 for Figure 2An enlarged structural schematic view at C;

[0017] Figure 5 As Figure 2 An enlarged structural schematic view at D;

[0018] Figure 6 A structural schematic view of the flexible connecting piece used in the embodiment of the utility model.

[0019] In the figure: 10, first corrugated elastic ring; 20, second corrugated elastic ring; 30, rigid connecting piece; 31, connecting body; 311, accommodating cavity; 312, female interface; 313, male joint; 314, perforation; 40, flexible connecting piece; 41, first connecting body; 42, second connecting body; 43, hollow capsule; 431, annular groove; 50, tension cable; 51, first joint; 52, second joint. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clear and apparent, the utility model will be further described in detail below by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0021] It should be noted that when an element is referred to as "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or several of the features. In the description of the present application, the meaning of "a plurality of", "several" is two or more than two, unless otherwise specifically limited.

[0022] Please see Figures 1 to 6The utility model provides an outer peripheral blood vessel support, and the outer peripheral blood vessel support comprises a plurality of first corrugated elastic rings 10 and a plurality of second corrugated elastic rings 20, each first corrugated elastic ring 10 and each second corrugated elastic ring 20 are arranged in turn in cross form, each trough of the first corrugated elastic ring 10 and each peak of the second corrugated elastic ring 20 on one side are connected in one-to-one correspondence through a plurality of rigid connecting pieces 30, each peak of the first corrugated elastic ring 10 and each trough of the second corrugated elastic ring 20 on the other side are connected in one-to-one correspondence through a flexible connecting piece 40, wherein each rigid connecting piece 30 between adjacent first corrugated elastic rings 10 and second corrugated elastic rings 20 is connected in turn to form a tension ring through a tension cable 50, and the tension ring has a first tension diameter and a second tension diameter greater than the first tension diameter.

[0023] It is understood that the trough of the first corrugated elastic ring 10 and the peak of the second corrugated elastic ring 20 are fixed through the rigid connecting piece 30 in the embodiment, so that the radial support force of the first corrugated elastic ring 10 and the second corrugated elastic ring 20 can be improved, and the problem of poor blood flow caused by flattening deformation of the two can be avoided, and on this basis, the peak of the first corrugated elastic ring 10 and the trough of the second corrugated elastic ring 20 are connected through the flexible connecting piece 40, so that the adjacent first corrugated elastic ring 10 and the second corrugated elastic ring 20 are one section, and each section can be bent based on the flexible connecting piece 40, so as to ensure that the implanted outer peripheral blood vessel support can be flexibly bent and deformed with the movement of the body.

[0024] It should be noted that the outer peripheral blood vessel support provided in the embodiment uses a balloon catheter as a carrier when implanted in the occluded blood vessel site, referring to Figure 2 , the balloon of the balloon catheter is in a contracted state in the initial state, and the outer peripheral blood vessel support is compressed to a minimum diameter state, that is, the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are both in a contracted state of being hooped on the balloon catheter, when reaching the blood vessel stenosis position, the balloon catheter inflates and expands to make the first corrugated elastic ring 10 and the second corrugated elastic ring 20 expand synchronously, and at the same time, the tension cable 50 is elongated to form a tension ring with a first tension diameter, so that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 expand the blood vessel together with the first tension diameter; for the case that the blood vessel appears restenosis after operation, the balloon catheter can be inflated and expanded through the implanted outer peripheral blood vessel support, so that the tension cable 50 is elongated again to form a tension ring with a second tension diameter greater than the first tension diameter, so that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are expanded in diameter to perform secondary expansion on the restenotic blood vessel, thereby solving the problem of blood vessel restenosis after implantation of the outer peripheral blood vessel support.

[0025] Compared with the prior art, the peripheral blood vessel stent provided by the embodiment adopts the mode that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are sequentially connected through the rigid connecting piece 30 and the flexible connecting piece 40, can utilize the rigid connecting piece 30 to improve the axial offset support force between the first corrugated elastic ring 10 and the second corrugated elastic ring 20, and utilize the flexible connecting piece 40 to ensure that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 have bending deformation capability; on this basis, after being implanted at a blood vessel occlusion position, each rigid connecting piece 30 connected in sequence through the tension cable 50 is expanded to form a tension ring having a first tension diameter, so as to expand the occluded blood vessel; since the tension ring can form a circumferential tension constraint on the first corrugated elastic ring 10 and the second corrugated elastic ring 20, the tension cable 50 can be released again when the current blood vessel position appears restenosis, so that the tension ring is expanded from the first tension diameter to a second tension diameter, and then the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are further expanded on the basis of the original expansion, so that the restenosed blood vessel is further expanded and dredged, the restenosis problem after the peripheral stent intervention surgery can be solved, the peripheral stent intervention surgery effect is improved, and the psychological burden of the patient is eliminated.

[0026] In some embodiments, referring to Figures 1 to 5 The rigid connecting piece 30 includes a connecting body 31, one end of the connecting body 31 is fixedly connected with the trough of the first corrugated elastic ring 10, and the other end is fixedly connected with the crest of the second corrugated elastic ring 20; the inside of the connecting body 31 has a containing cavity 311 suitable for the tension cable 50 to pass in.

[0027] The connecting body 31 is fixedly connected with the trough of the first corrugated elastic ring 10 and the crest of the second corrugated elastic ring 20 in the axial direction, and forms the containing cavity 311 for connecting the tension cable 50 in the circumferential direction; in the completely contracted state, the tension cable 50 is entirely contained in the containing cavity 311, so as to avoid the tension cable 50 from being exposed and affecting the smoothness of the following balloon catheter in the blood vessel; when expanded for the first time, the tension cable partially extends out of the containing cavity 311, so as to be able to be expanded for the second time including a margin when the restenosis problem occurs.

[0028] As a specific embodiment of the above-mentioned tension cable 50, please refer to Figure 4 and Figure 5, the two ends of the tension cable 50 are respectively provided with a first joint 51 and a second joint 52, the first joint 51 of each tension cable 50 is adapted to form a plug-in fit with the second joint 52 of the adjacent tension cable 50 in the same accommodating cavity 311. In the initial state, the first joint 51 and the second joint 52 remain in the plug-in state, when the first expansion is performed, the tension cable 50 is taut and the first joint 51 and the second joint 52 still remain in the plug-in state, thereby forming a circumferential tension constraint for each rigid connecting piece 30, so that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are expanded to a first tension diameter consistent with the tension ring diameter; when the second expansion is needed, the inflation force of the balloon catheter is used to make the first joint 51 and the second joint 52 disengage, so that the tension cable 50 further extends out of the accommodating cavity 311 to form a tension ring with a second tension diameter, so that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are secondarily expanded to the second tension diameter, so that the restenotic blood vessel is further expanded to realize the blood flow.

[0029] In some possible implementation manners, please refer to Figures 3 to 5 , one end of the accommodating cavity 311 forms a female interface 312, the other end forms a male joint 313 adapted to plug-in fit with the female interface 312, the female interface 312 and the male joint 313 both have a through hole 314 adapted for the tension cable 50 to pass through to extend into the accommodating cavity 311. In the initial state, the female interface 312 and the male joint 313 of the adjacent rigid connecting piece 30 are plugged together, thereby forming a circumferential compression for the first corrugated elastic ring 10 and the second corrugated elastic ring 20, so as to ensure that the whole peripheral vascular stent can be stably hooped on the balloon catheter to smoothly advance in the blood vessel, when reaching the target position of the blood vessel stenosis, the inflation force of the balloon is used to make the female interface 312 and the male joint 313 disengage, so that the tension cable 50 extends out of the through hole 314 to form a tension ring with a first tension diameter, which can improve the smoothness of the implantation process of the peripheral vascular stent.

[0030] As a specific embodiment of the above-mentioned flexible connecting piece 40, please refer to Figure 1 and Figure 6 , the flexible connecting piece 40 includes a first connecting body 41, a second connecting body 42, and a plurality of hollow capsules 43 sequentially stacked between the first connecting body 41 and the second connecting body 42; the wave crest of the first corrugated elastic ring 10 is connected with the second connecting body 42, and the wave trough of the second corrugated elastic ring 20 is connected with the second connecting body 42. The universal connection between the first connecting body 41 and the second connecting body 42 is realized by stacking and connecting the plurality of hollow capsules 43, so that the first corrugated elastic ring 10 and the second corrugated elastic ring 20 connected through the flexible connecting piece 40 can be conveniently and flexibly bent to adapt to the changes of the blood vessel following the body movement.

[0031] Specifically, as Figure 6As shown, the hollow capsules 43 are sequentially communicated, and the annular grooves 431 are formed between the adjacent hollow capsules 43. The sequentially communicated hollow capsules 43 can realize the circulation of the internal gas, thereby improving the flexibility of the hollow capsules 43 in the annular grooves 431.

[0032] In some possible implementation manners, the accommodation cavity 311 is filled with an anti-proliferation drug. The anti-proliferation drug can be paclitaxel, which can stop the cell development at the G0 / G1 stage, thereby inhibiting the division, proliferation, migration and information transmission of the vascular smooth muscle cells, and reducing the occurrence of restenosis. In this way, the tension cable 50 in the initial state can be soaked in the anti-proliferation drug, and when the tension cable 50 extends out of the accommodation cavity 311 in the expansion process, the surface of the tension cable 50 can be coated with the anti-proliferation drug, thereby reducing the probability of restenosis after the operation.

[0033] It should be noted that the surfaces of the first corrugated elastic ring 10 and the second corrugated elastic ring 20 are provided with a drug coating. The drug coating can be a heparin coating for anti-thrombosis, a dexamethasone coating for anti-inflammation, or an anti-proliferation drug coating such as a rapamycin coating or a paclitaxel coating. The drug coating can improve the combination effect of the first corrugated elastic ring 10 and the second corrugated elastic ring 20 with the blood vessel wall, and reduce the risk of restenosis.

[0034] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A peripheral vascular stent, characterized by, The first corrugated elastic ring and the second corrugated elastic ring are arranged alternately. The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

2. The peripheral vascular stent of claim 1, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

3. The peripheral vascular stent of claim 2, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

4. The peripheral vascular stent of claim 2, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

5. The peripheral vascular stent of claim 1, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

6. The peripheral vascular stent of claim 5, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

7. The peripheral vascular stent of claim 2, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

8. The peripheral vascular stent of any of claims 1-7, wherein, The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side. The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side. The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side. The rigid connecting piece is connected with the valley of the first corrugated elastic ring and the peak of the second corrugated elastic ring on one side, and the flexible connecting piece is connected with the peak of the first corrugated elastic ring and the valley of the second corrugated elastic ring on the other side.

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