1results about How to "Control degradation rate" patented technology

This invention relates to the field of medical device manufacturing technology, and in particular to a method for preparing a composite material stent and the stent made therefrom. The method includes the following steps: Step S1, preparation of magnesium alloy tubing and initial processing of the skeleton; Step S2, surface pretreatment of the skeleton; Step S3, construction of an intermediate bonding layer; Step S4, coating with a PLLA outer layer; Step S5, molding and post-processing; Step S6, final inspection and sterilization. This invention achieves synergistically enhanced mechanical properties. The magnesium alloy core provides strong initial support, while the PLLA outer layer provides supplementary support. It also exhibits controllable degradation performance; the PLLA outer layer effectively delays the corrosion of the magnesium alloy by chloride ions and other substances in body fluids, extending the support time. The PLLA outer layer isolates the magnesium alloy from direct contact with blood, further reducing the risk of thrombosis. The specially designed intermediate bonding layer structure ensures the structural integrity of the stent during its service life.