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Gradually-expanding intravascular stent

A vascular stent and memory alloy technology, applied in the field of medical devices, can solve problems such as unsolved vascular tissue damage, and achieve the effects of eliminating vascular damage, improving long-term efficacy, and inhibiting restenosis.

Inactive Publication Date: 2012-08-08
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of vascular tissue damage caused by stent expansion remains unsolved

Method used

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  • Gradually-expanding intravascular stent
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  • Gradually-expanding intravascular stent

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Embodiment Construction

[0019] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and Examples. The present embodiment provides detailed implementation and specific operation process on the premise of the technical solution of the present invention, but the protection scope of the present invention is not limited to the following Example.

[0020] Such as figure 1 As shown, the progressively expanding vascular stent of the present invention includes: a stent base 4 and a force resistance system 5 .

[0021] The stent matrix 4 is made of a shape memory alloy, which is one of Ti-Ni base, copper base or iron base shape memory alloy, please refer to figure 2 , the stent base 4 is braided by shape memory alloy wire, or cut and welded by shape memory alloy sheet.

[0022] The force impedance system 5 is formed of biodegradable materials, which can be polylactic acid (PLA), poly-L-lactic acid (PLLA), polyglycolic acid (PGA), pol...

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Abstract

The invention discloses a gradually-expanding intravascular stent, which comprises a stent substrate constructed by a shape memory alloy and a mechanical impedance system formed by a biodegradable material, wherein the stent substrate is formed by weaving a shape memory alloy wire or formed by cutting and welding a shape memory alloy sheet, is extended along the axial direction, is shortened along the radial direction and is compounded with a biodegradable material to form an integrated compound structure. Due to the adoption of the gradually-expanding intravascular stent, gradual expansion of the intravascular stent and accurate control over an expansion process are realized, high mechanical adaptability is achieved for blood vessels in an expansion process, vessel injuries caused by intravascular stent expansion are relieved and eliminated to the maximum extent, the occurrence of restenosis in the intravascular stent is inhibited, and long-term curative effect of the intravascular stent is effectively enhanced; and the gradually-expanding intravascular stent can be applied to interventional therapy of cardiovascular diseases.

Description

technical field [0001] The invention relates to a device for interventional treatment of cardiovascular diseases, in particular to a gradually expanding vascular stent with a composite structure of a superelastic shape memory alloy and a biodegradable material, belonging to the technical field of medical devices. Background technique [0002] Cardiovascular disease is the number one killer threatening human health. Interventional stenting is one of the main methods for the treatment of cardiovascular diseases. Currently, vascular stents widely used in clinical practice mainly include bare metal stents and drug-eluting stents. Bare metal stents have achieved remarkable curative effects after entering clinical treatment, but after more than ten years of application, some shortcomings and disadvantages have gradually been exposed, such as prone to thrombosis, high restenosis rate, and damage to vessel walls, etc. Clinical studies have shown that the incidence of in-stent reste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L31/06A61L31/02A61L31/14A61F2/82
Inventor 罗云李祥张文光周文选
Owner SHANGHAI JIAO TONG UNIV
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