Medical hollow needle and a method of producing thereof

Details Medical hollow needle and a method of producing thereof Medical hollow needle and a method of producing thereof

1995-07-19

1996-11-19

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604264, A61M 532

Patent

active

055757804

ABSTRACT:
A medical hollow needle has a cylindrical member 2 inside which a medical liquid flow hole 25 is formed in the direction of its center axis. At a top edge portion 10 of the cylindrical member 2, a first bevel face 3 where the medical liquid flow hole 25 is open in an oblique direction, formed having a first inclined angle with respect to the axis center, is provided. At the top edge portion 10, a right bevel face 6, formed by rotating a first rotational angle in a positive direction with respect to the first bevel face 3 with the axis center as its center, having a second inclined angle with respect to the axis center is provided, and the left bevel face 7, formed by rotating a second rotational angle in an opposite direction with respect to the first bevel face 3 with the axis center as its center, having a third inclined angle with respect to the axis center, is provided. At the position opposed to the first bevel face 3 of the top edge portion 10, the sub-bevel face 12 grinded and formed in an oblique direction with respect to the axis center direction, thinning a wall thickness NA of the cylindrical member 2, is provided. A sharp edge portion 13 is comprised of at least these three bevel faces 6, 7, 12.

REFERENCES:
patent: 1749919 (1930-03-01), Mierley
patent: 2751907 (1956-06-01), Hickey
patent: 3924617 (1975-12-01), Ferro
patent: 4368738 (1983-01-01), Tersteegen et al.
patent: 4490139 (1984-12-01), Huizenga et al.
patent: 4565545 (1986-01-01), Suzuki
patent: 5064411 (1991-11-01), Gordon, III
patent: 5484422 (1996-01-01), Sloane, Jr. et al.

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