Patent ID: 6517523
Filing Date: 2003-02-11
Classification: A61M

Abstract:
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.