| 摘要 |
A multi-zone, multi-functional graft (10) with two or more zones (12, 14) that have different chemical, and biological characteristics, is provided. The vascular conduit has an inner zone (12) that is permanently non-thrombogenic, anti-proliferative, and one or more outer zones that allow for beneficial tissue ingrowth, and sealing of the graft to prevent leakage. The small diameter vascular conduits of the present invention containing these different zones may be fabricated from woven or knitted DACRON, extruded porous PTFE, from polyurethane polymer, or other similar materials, and the structure of these conduits so modified as to provide these different zones. One embodiment contains an inner non-thrombogenic layer (12), and an outer thrombogenic layer, optionally containing a growth agent. A second embodiment contains a third intermediate layer having a growth agent impregnated therein. |
