Hypodermic cannula

Details Hypodermic cannula Hypodermic cannula

1995-07-28

1996-07-16

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

606223, A61M 500

Patent

active

055362591

ABSTRACT:
A tissue penetrating cannula comprises a tube having a sharp end formed by a first cut surface defining an acute angle to the longitudinal axis of the tube and forming a generally oval tube edge defining a similar acute angle to the longitudinal axis. A second cut surface is defined along a right hand forward portion of the oval tube edge, and a third cut surface is defined along a left hand forward portion of the oval tube edge. A second and third cut surfaces define between them a forward cutting surface in the tube edge. A fourth cut surface at the point intersects the second and third cut surfaces to cause the cutting surface to be spaced inwardly of the tube outer wall.

REFERENCES:
patent: 2187259 (1940-01-01), Barnhart
patent: 2697438 (1954-12-01), Hickey
patent: 3289675 (1966-12-01), Dunmire et al.
patent: 3308822 (1967-03-01), De Luca
patent: 4368738 (1983-01-01), Tersteegen et al.
patent: 4561445 (1985-12-01), Berke et al.
patent: 4586926 (1986-05-01), Osborne
patent: 4689040 (1987-08-01), Thompson
patent: 4826492 (1989-05-01), Magasi
patent: 5290267 (1994-03-01), Zimmermann
patent: 5405354 (1995-04-01), Sarrett
patent: 5484422 (1996-01-01), Sloane, Jr. et al.

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