Dilating trocar shield with blade tip

摘要

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 sharpened portion of the blade is substantially narrower than the inner diameter of the cannula tube and can be completely covered by the shield. The improved shielded trocar is provided with an improved shield design having a dolphin-nose shape at its distal end.