Trocar with retracting tip and palm actuator mechanism

Abstract

Abstract A trocar assembly (10) consisting of an obturator (42) having a piercing tip (44) reciprocable within a trocar tube (60) includes a palm pushbutton (24) for actuation. The pushbutton (24) extends from the proximal end of a hand grip (16) so that the trocar may be cocked and operated with one hand. Also included is a locking member (86) for holding the pushbutton (24) in a depressed position after cocking and until the tip (44) has been retracted into the trocar tube (60) after firing. After firing, the pushbutton (24) is unlocked and returns to its extended position through a pushbutton spring (80) so as to give a visual indication and be ready for the next cycle. Several springs (136, 144) are provided so that each of the several movements of the trocar (10) are separately biased by individual springs. In this manner each movement may be separately 'tuned'. A mechanical advantage is provided whereby movement of the pushbutton (24) is translated into a greater movement of the obturator (42) and attached tip (44).

Inventors

• 👤 Peter F. Costa
• 👤 William A. Holmes
• 👤 Frederic H. Moll

Bibliographic Details