| 摘要 |
A prosthesis for use in preventing restenosis after angioplasty is formed of plastic or sheet metal, and is expandable and contractible for placement. The prosthesis can be inserted while in a collapsed position, then expanded and locked at the larger diameter. Spring force can be provided by the material itself, or metal springs can be embedded within the walls of the prosthesis. Preferably, the walls have holes therethrough to promote tissue growth; and, in one embodiment, the holes are in the form of slots so that the prosthesis is segmented and can bend longitudinally. In a further embodiment the angioplasty stent is fitted with an internal fabric liner of substantially the same longitudinal dimensions as the stent. It is adhesively secured to the internal wall of the stent at selected points whereby the liner may have longitudinal fold or folds and may then be expanded as the stent is expanded after being positioned. |
