Trocar with retractable cutting surface

Details Trocar with retractable cutting surface Trocar with retractable cutting surface

2004-08-03

2008-09-02

Manahan, Todd E. (Department: 3731)

Surgery

Instruments

Cutting, puncturing or piercing

Reexamination Certificate

active

07419496

ABSTRACT:
A trocar having a cutting shaft with a cutting surface at a distal end. The cutting shaft moves longitudinally with respect to an obturator such that in one position the cutting surface is in an exposed position suitable for application of a piercing force. Upon interruption of the piercing force to the cutting surface, the cutting surface moves longitudinally with respect to the obturator such that the cutting surface is in a retracted position within the obturator. The trocar may include a first spring urging the cutting surface to an exposed position and a second spring urging the cutting surface to a retracted position. The second spring has a slightly stronger biasing force than the first spring to bias the cutting surface to the retracted position.

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