Tubing
US5533985A · kind A · utility
324Cited by
11References
26Claims
0Family size
Inventor
Key dates
| Filing date | Apr 20, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Apr 20, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7542
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Differential stiffness tubing for medical products, such as catheters, and a method and apparatus for making the tubing. The tubing 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 tubing is made using a resin modulating system and a unique co-extrusion head that minimize the length of the transition section by minimizing the volumes in all flow channels of the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.