Expandable obturator and catheter assembly including same
US5015238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Sep 20, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L2300/45
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An oburator includes a solid substantially stiff rod of a nonhydrophilic polymer coated with a layer of a hydrophilic polyurethane which may have an antithrombogenic agent bulk distributing therein. When the hydrophilic polyurethane comes into contact with an aqueous liquid such as water, saline or a body fluid, it absorbs the liquid and expands thereby enlarging the diameter of the obturator. Another aspect of the invention is an assembly of a catheter and the obturator of the invention. When the obturator is emplaced in the catheter and brought into contact with a liquid, it expands, releases the antithrombogenic agent and contacts the lumen wall of the catheter thereby forming a seal which prevents backflow of a body fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.