Method for producing tubing useful as a tapered vascular graft prosthesis
US4957669A · kind A · utility
82Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1989 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Apr 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S623/901
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
PTFE vascular tubing is guided on to a tapered ultrasonic horn as the horn is oscillating at a high frequency. This action causes the end of the tubing moved onto the horn to expand. The expanded tubing is then positioned on a mandrel having a desired shape, such as tapered, and resintered. The finished tubing with an expanded diameter on one end and a non-expanded diameter on the other end is then removed from the mandrel, and is ready for use. Untapered tubing can also be radially expanded by this method to provide a thinner wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.