| 摘要 |
<p>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, so that fracture can be avoided; moreover, the internal stress of the tube can be effectively released, thereby improving the service life of the frame.</p> |
