Porous membranes based on unstable polymer solutions
US5387621A · kind A · utility
10Cited by
7References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Feb 11, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S623/921
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Porous, distensible, gel-like membranes which in tubular form are suitable as implants, e.g., vascular prostheses and a process for the preparation thereof is described. The membranes are formed by a spraying, phase-inversion technique which employs thermodynamically unstable polymer solutions and is accomplished by separately spraying the unstable solution and a nonsolvent onto a rotating surface. Prostheses from the highly porous tubular membranes have shown a high degree of patency and completeness of the healing process and are useful for direct implantation in the body or for extracorporeal vascular accesses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.