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1. (WO1994027513) RETRACTING TIP TROCAR WITH PLUNGER SENSOR

Pub. No.:    WO/1994/027513    International Application No.:    PCT/US1994/006048
Publication Date: Dec 8, 1994 International Filing Date: May 27, 1994
IPC: A61B 17/34
Applicants: ORIGIN MEDSYSTEMS, INC.
Inventors: BOLDUC, Lee, R.
LOOMAS, Bryan, E.
MILLER, Scott, H.
Title: RETRACTING TIP TROCAR WITH PLUNGER SENSOR
Abstract:
A cannula is extended through the wall of a body cavity by a trocar having a piercing head (42) slidable through the cannula between a condition extending distally from the cannula and a condition retracted within the cannula. A latch (62) releasably secures the piercing head (42) in the extended condition against the force of a spring (60) which normally biases the piercing head (42) to the retracted condition. Resiliently biased plungers (38) extend longitudinally of the piercing head (42) for retraction in response to counterforce as the piercing head (42) advances through the wall of a body passage and extension upon the release of the counterforce. Extension of the plungers (38) upon release of the counterforce functions to release the piercing head (42) for retraction.