Method for making tubing
US5622665A · kind A · utility
111Cited by
11References
11Claims
0Family size
Inventor
Key dates
| Filing date | Jun 2, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Jun 2, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7542
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for making differential stiffness tubing for medical products, such as catheters. The method produces a tubing that has a stiff section and a flexible section joined by a relatively short transition section in which the materials of the stiff and flexible sections are wedged into each other in a smooth gradual manner to produce an inseparable bond between the materials without abrupt joints. The method also employs a resin modulating system that minimizes the length of the transition section by minimizing the volumes in all flow channels of the co-extrusion head used to produce the tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.