| 摘要 |
An improved prosthetic heart valve comprises a support body or stent covered by a layer of biological tissue having only the smooth surfaces thereof presented outwardly. The stent has a cutaway section and a flexible cusp sewn thereto for opening and closing the valve. The valve cusp is made of pericardial tissue which has been doubled over such that the rough side thereof is folded inwardly. A sewing ring is secured around the base of the stent and is made of pericardial or other biological material, so as to increase the likelihood of the sewing ring becoming covered with epithelium. The smooth-surfaced biological construction of the valve is highly durable and reduces the risk of thrombogenic or infection sites. |
