Coextruded tubing
US6431219B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2001 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Feb 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1393
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Flexible medical grade PVC tubing has inner and outer layers coextruded with different plasticizers, with the first, inside layer of the tubing containing a plasticizer, such as di-ethylhexyl adipate, and having a thickness adapted to limit migration of a second plasticizer, such as di-ethylhexyl phthalate, from a second, outer layer of the tubing to the inside of the tubing. The flexible medical grade tubing can optionally include a third, outermost layer surrounding the second layer and containing a plasticizer such as di-ethylhexyl adipate, so that the third layer limits migration of the second plasticizer to the outside of the tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.