Safety cannula

Details Safety cannula Safety cannula

1998-06-29

1999-08-24

Coggins, Wynn Wood

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604272, 604164, A61M 500

Patent

active

059418508

ABSTRACT:
The present invention is anti prick needle which is extendable and retractable only under positive user control. The present invention has an auto stopper that prevents inadvertent extension of the needle to an operable position without user invention. In operation the present invention is fitted to the end of a syringe. The user pushes down on an extending device which releases a latching device permitting the needle to slide forward to an operable position against a spring bias. The needle remains extended as long as the user continues to push on the extending device. When the user has completed an injection and releases the extending device the needle is automatically retracted by the spring bias. Further, once the needle is retracted into the needle holder an auto stopper latching device is activated which closes the opening preventing the needle from being extended with the extending device or other means.

REFERENCES:
patent: 4154242 (1979-05-01), Termanini
patent: 4828548 (1989-05-01), Walter
patent: 5024665 (1991-06-01), Kaufman
patent: 5207647 (1993-05-01), Phelps
patent: 5407431 (1995-04-01), Botich et al.

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