Method of making large diameter vascular prosteheses and a vascular prosthesis made by said method
US6187054A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S623/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method is disclosed for making vascular prostheses from ePTFE said prostheses having a diameter which is larger, and a wall thickness which is smaller than previously achievable using ram extrusion techniques. The method consists of extruding a PTFE tube, finish processing the tube into an ePTFE tube, laterally dilating it by expansion in incremental steps, calendering the tube after each dilating step, while the tube is being maintained at an elevated temperature. Once the tube is dilated it can be sintered with another tube to form a laminate. Alternatively, a wire stent may be joined with one or more tubes, thereby biasing the laminate to a cylindrical configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.