US 6,517,523 B1Granted

Needle for injection syringe and method for manufacturing the same

AssigneeKaneko Kogyo Inc.

InventorsYukio Kaneko, Takeyoshi Sakashita

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Abstract

A tip portion of a needle main body having an edge point includes a first slant surface slanted at 10-18 degrees with respect to the axis of the needle main body, a pair of second slant surfaces slanted at 16-23 degrees, and a pair of third slant surfaces slanted at 19-27 degrees. The ratios of the lengths of the first, second, and third slant surfaces are set to be 40-50%, 5-15%, and 35-55%. At the time of forming the second slant surfaces and the third slant surfaces, a grinding wheel or the needle main body is turned relative to the other in a horizontal plane so that the direction of axis of the grinding wheel and the direction of axis of the needle main body are in a twisted or distorted relationship from a substantially orthogonal relationship such that the radial outer sides of the second and the third slant surfaces are included downwardly.

Claims4

Dependent claims

A needle for an injection syringe having a taper-shaped tip portion formed by cutting a tip portion of a cylindrical needle main body obliquely from one side thereof, the taper-shaped tip portion of said needle comprising:

a first slant surface contiguous to an outer peripheral surface of the cylindrical needle main body and formed at a predetermined angle with respect to an axis of the needle main body;
a pair of second slant surfaces contiguous to the first slant surface and symmetric with respect to the axis of the needle main body and formed at a larger angle with respect to this axis of the needle main body than the predetermined angle of the first slant surface;
and
a pair of third slant surfaces contiguous to the second slant surfaces and symmetric with respect to the axis of the needle main body and contiguous to an edge point, said pair of third slant surfaces being formed at a larger angle with respect to the axis of the needle main body than the angle of the second slant surfaces, wherein an inclination angle of the ridges formed at the connecting portions between the first slant surface and the second slant surface is in a range from 130 degrees to 150 degrees when the cylindrical main body is viewed from the axis direction of the main body, and a inclination angle of the ridges formed at the connecting portions between the second slant surface and the third slant surface is in a range from 115 degrees to 135 degrees when the cylindrical main body is viewed from the axis direction of the main body.

1 more element

Dependencies are inferred from the claim text.