METHOD FOR PREPARING BIODEGRADABLE POLYMER FRAME

• Main Authors: MENG, JUAN, CHEN, SHUGUO, LUO, QIYI, CHEN, BAOAI
• Format: Patent
• Language: Chinese; English; French
• Published: 26.06.2014
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BANDAGES, DRESSINGS OR ABSORBENT PADS; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PERFORMING OPERATIONS; PROSTHESES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; TREATMENT OR PROTECTION OF EYES OR EARS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method for preparing a biodegradable polymer frame comprises the following steps: 1) preparing a biodegradable polymer original tube (2) by using a biodegradable polymer material; 2) placing the original tube (2) in a tubular die (1), heating the original tube, and filling the original tube (2) with high-pressure gas, so that the original tube (2) can be highly oriented at the radial direction, and moreover, axially stretching the tube (2) along the axial direction of the tube (2), so that the tube (2) is oriented at the radial direction and the axial direction at the same time; 3) annealing the huffed tube (3) at the annealing temperature, to obtain the formed tube, the annealing temperature being higher than the transformation temperature (Tg) at which the polymer material is vitrified and being lower than the melting temperature (Tm) of the polymer material; and 4) preparing a biodegradable polymer frame (4) by using the formed tube. With the method, the short-time sustenance of the frame (4) is enhanced