Trocar-cannula device
US5824002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Nov 20, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/3482
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A trocar device, comprising a trocar cutting element, a surrounding insulating sheath, and a cannula surrounding the sheath, also includes an arrangement providing a substantially smooth transition between the sheath and cannula at the distal end of the cannula during the insertion of the trocar device into a patient so as to reduce drag on the device at the transition. In one embodiment, the sheath includes a shaped portion of enlarged diameter, and the cannula includes, at the distal end thereof, inwardly directed slits forming corresponding resilient leaf members which engage the shaped portion to provide the smooth transition. The shaped portion includes oppositely tapered surfaces meeting at a common apex. In another embodiment, an expandable section, when expanded, provides the smooth transition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.