Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-06-27
1991-11-19
Apley, Richard J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604117, 604164, 604264, 604172, A61M 546, A61M 2508, A61M 2501, A61M 2506
Patent
active
050662880
ABSTRACT:
A safety trocar is provided which includes a spring-loaded shield that shields the cutting tip of the obturator after the obturator penetrates tissue. The distal end of the shield is hemispheric in profile and contains a slot which conforms to the geometry of the cutting tip. The rounded distal end enables the shield to spring forward to shield the cutting tip as soon as the tip perforates the tissue. A valve is located at the proximal end of the trocar tube to seal the end of the tube. The valve is oriented at an acute angle with respect to the longitudinal axis of the trocar tube. The valve is controllable by an external lever which will hold the valve open or permit it to spring shut. An incremental advancement mechanism cooperates with the obturator to permit only incremental advance of the obturator. Instead of using a discrete shield component the shielding function may be provided by spring-loading the trocar tube itself to spring forward and shield the obturator tip after the tip penetrates tissue.
REFERENCES:
patent: 4168699 (1979-09-01), Hauser
patent: 4177814 (1979-12-01), Knepshield et al.
patent: 4535773 (1985-08-01), Yoon
patent: 4601710 (1986-07-01), Moll
patent: 4654030 (1987-03-01), Moll et al.
patent: 4902280 (1990-02-01), Lander
patent: 4931042 (1990-06-01), Holmes et al.
Deniega Jose C.
Failla Stephen J.
Apley Richard J.
Brinton Yorks, Jr. W.
Coletti Paul A.
Ethicon Inc.
Horowitz Karen G.
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