Retracting tip trocar with plunger sensor
US5527335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1994 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Nov 8, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/3496
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A cannula is extended through the wall of a body cavity by a trocar having a piercing head slidable through the cannula between a condition extending distally from the cannula and a condition retracted within the cannula. A latch releasably secures the piercing head in the extended condition against the force of a spring which normally biases the piercing head to the retracted condition. Resiliently biased plungers extend longitudinally of the piercing head for retraction in response to counterforce as the piercing head advances through the wall of a body passage and extension upon the release of the counterforce. Extension of the plungers upon release of the counterforce functions to release the piercing head for retraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.