Trochar system for laparoscopy

Abstract

Abstract In accordance with this invention a disposable trochar (T) for use as a gas insufflation neeedle is provided for insertion through the abdominal wall of a patient and into a body cavity. It has an outer sheath (S) with a tubular body, a distal open end and a proximate open end. The distal end may have means which is expandable (46) after the trochar has been inserted into the body cavity to minimize dislocation of the outer sheath during use. A cannula (10) is removably received within the sheath which has a sharp distal end (14) extendable beyond the distal end of the sheath and an enlarged head (12) at the proximate end of the cannula. The head has a flat land (45) which is engageable with the proximate end of the sheath to limit the extension of the distal end of the cannula beyond the distal end of the sheath. A rod (16) is mounted within the cannula for longitudinal movement between a retracted position and an extended position. A blunt member (29) is provided at the distal end of the rod extending beyond the sharp distal end of the cannula when in extended position. A spring (20), in a cavity in the head, is attached to the proximate end of the rod urging it toward the extended position. The method of using the trochar is also disclosed.

Inventors

• 👤 Edwin L. Adair

Bibliographic Details