초록 ▼

A trocar is formed from a cannula and an interfitting obturator for penetrating body cavity walls in laparoscopic and endoscopic surgery. The obturator is provided with an improved piercing tip having a pointed blade and an improved double locking blunt nosed shield design. Hydrophilic coatings or c

A trocar is formed from a cannula and an interfitting obturator for penetrating body cavity walls in laparoscopic and endoscopic surgery. The obturator is provided with an improved piercing tip having a pointed blade and an improved double locking blunt nosed shield design. Hydrophilic coatings or components are also employed on the shield and cannula to facilitate quicker shield action covering the pointed blade and ease of entry of the cannula tube through the body cavity wall. The cannula also has an improved inexpensive flexible flapper valve and can be manufactured with a reusable cannula tube but disposable flapper valve assembly to minimize cost. The shield locks in a partially retracted position whereby the point of the blade is covered, but sharp lateral portions are exposed.

대표청구항 ▼

A shielded obturator comprising: (a) an obturator sheath having a distal end and a proximate end; (b) a handle mounted to the proximate end of said obturator sheath; (c) a pointed blade on the distal end of the obturator sheath said pointed blade having a sharpened point at a distal end and sharpene

A shielded obturator comprising: (a) an obturator sheath having a distal end and a proximate end; (b) a handle mounted to the proximate end of said obturator sheath; (c) a pointed blade on the distal end of the obturator sheath said pointed blade having a sharpened point at a distal end and sharpened lateral portions; (d) a shield slidably mounted to the obturator sheath and movable relative to the pointed blade between an extended protective position, a partially retracted semi-protective position covering the sharpened point of the pointed blade while leaving at least a portion of the sharpened lateral portions exposed for cutting tissue, and a retracted unprotected position; and (e) a biasing means tending to bias the shield into the extended protective position.