Trocar with lockable shield

Details Trocar with lockable shield Trocar with lockable shield

1995-06-02

1997-03-04

Dawson, Glenn

Surgery

Instruments

Cutting, puncturing or piercing

604265, 604264, A61B 1734

Patent

active

056074409

ABSTRACT:
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.

REFERENCES:
patent: 4535773 (1985-08-01), Yoon
patent: 5112308 (1992-05-01), Olsen
patent: 5275583 (1994-01-01), Crainich
patent: 5411515 (1995-05-01), Haber et al.

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