Medical stent made of composite material

Abstract

The invention relates to the field of interventional medical appliances, and provides a medical stent made of a composite material. The material comprises a metal material (100), a degradable polymer material (201) and a medicine (301), and is characterized in that the metal material (100) and the degradable polymer material (201) are compounded together to furthest reduce the proportion of metal, so that the stent can meet the requirements of flexibility and supporting performance, and can reduce the phenomenon of flaking in the process of completely degrading the degradable stent; the medicine (301) can be compounded with the metal material (100) of the stent through the degradable polymer material (201), and is used for reducing inflammatory response, restenosis and thrombus when the stent is implanted.

Description

technical field [0001] The invention belongs to the field of interventional medical devices, and in particular relates to a drug support made of composite materials. Background technique [0002] As my country's aging population continues to be serious, obesity, high blood pressure, and heart disease have become the number one public enemy of the elderly, and cardiovascular diseases are increasing year by year. Statistics show that the implantation of cardiovascular stents in my country has reached 700,000 pieces in 2011. Since then, with the decline of the average price of stents and more coverage of medical insurance, cardiovascular stents have grown at a rate of about 20% per year. It is estimated that in 2013 By the end of the year, the total number of implants nationwide will reach 1 million. In the next few years, the national medical policy will continue to reduce various medical expenses. It is expected that the price of cardiac stents will still show a downward tren...

AI Technical Summary

Problems solved by technology

At present, the support materials used in the clinical application of drug stents or bare stents are mainly single metal materials. These mainstream materials are 316L stainless steel and cobalt-chromium alloy. Due to the need for support strength, the thickness of the stent is generally 80 μm to 140 μm. The width is also large; these stents often occupy the lumen space of the blood vessel after implantation, which is easy to cause restenosis and even thrombosis

At present, there are also studies using drug stents made entirely of degradable materials, but the main problem of this kind of stent is the matching of its support performance and the degradation rate of degradable materials, and it is prone to stent fracture and thrombus caused by the falling off of blocks. question

Images