Expansible cannula
US5139511A · kind A · utility
155Cited by
1References
10Claims
0Family size
Inventors
Key dates
| Filing date | Feb 13, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Feb 13, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M29/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides an expansible cannula (particularly useful as a trocar) comprising essentially a conical tube made of metal foil with its proximal end located in a holder, and an expander tube which can be pushed through the stem from the proximal end, to cause the stem to expand from its conical free condition to a distended cylindrical condition. The stem itself comprises a caudex which has only radial motion on expansion of the stem, and a leaf, which in addition to uncoiling on expansion of the stem is also permitted a degree of forward motion, so that the front end of the stem becomes circular in the opened condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.