An ultra-high antibacterial performance austenitic stainless steel for medical implant stents

Abstract

The invention aims to provide an ultrahigh-antibacterial-performance austenitic stainless steel material applied to a medical implantable stent and a preparation method thereof. The ultrahigh-antibacterial-performance austenitic stainless steel material has an effective function of resisting to high-concentration bacteria (>(8-9)*10<6> CFU / mL) in the heat treatment state of solution treatment andaging, and the risk of corrosion of bacteria microorganisms caused by the use of austenitic stainless steel can be remarkably reduced. The stainless steel comprises the following chemical components of, by weight, 16.0%-17.5% of Cr, 10.0%-14.0% of Ni, 2.0%-3.0% of Mo, 2.5%-4.5% of Cu, 1.0%-2.5% of Ga, 0.1%-0.15% of N, less than or equal to 0.03% of C, less than or equal to 0.75% of Si, less than or equal to 2.0% of Mn, less than or equal to 0.045% of P, less than or equal to 0.03% of S and the balance Fe. The ultrahigh-antibacterial-performance austenitic stainless steel is widely applied to material of the medical implantable stent, and specifically applied to medical implantable stent products such as a cardiovascular stent, a urethra stent, an intestinal stent and a bile duct stent.

Description

technical field [0001] The invention belongs to the field of biomedical materials, and relates to a variety of stainless steel medical brackets, in particular to the technical field of austenitic stainless steel materials, specifically a super-high antibacterial performance austenitic stainless steel material used in medical implant brackets and its preparation method. Background technique [0002] Medical stent implantation is one of the important methods to treat diseases such as stenosis and blockage of organoids transported through the human body. The implantation of stents can support and dredge the diseased area. Since its appearance, it has received widespread attention. Stent products have the characteristics of high flexibility, good traceability, anti-thrombosis, high degree of biocompatibility, high support strength and small surface area. At present, stent products are usually made of metal alloys such as stainless steel or Nitinol. Due to their metal structure...

AI Technical Summary

Problems solved by technology

However, the large number of bacteria in the postoperative site caused strong corrosive damage, and caused a huge health impact on the human body, making the proliferation of postoperative bacteria and the corrosion behavior of stainless steel implants widely concerned.

Therefore, the service life of 316LN austenitic stainless steel is greatly reduced. It is necessary to use antibacterial functional 316LN-Cu austenitic stainless steel for the postoperative human environment containing bacterial microorganisms. However, it is limited by the current antibacterial functional stainless steel. The influence of antibacterial properties, the long time to kill bacteria and the limitation of the concentration range of inhibiting bacteria cannot make the traditional antibacterial functional 316LN-Cu austenitic stainless steel be effectively applied.

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