Patent ID: 9017299
Filing Date: 2015-04-28
Classification: A61M,B24B

Abstract:
1. A medical hollow needle including a needle tube in a cylindrical shape with a blade surface inclined against a central axis thereof at a tip of the needle tube, wherein the blade surface comprises: a first inclined surface located on a base end side; a second inclined surface and a third inclined surface, the second inclined surface and the third inclined surface being located on a tip end side and provided with a same rotational angle in a direction opposite to each other around the central axis relative to the first inclined surface, the second inclined surface and the third inclined surface having a same inclination angle to the central axis, the same inclination angle being larger than the inclination angle of the first inclined surface; and fourth inclined surfaces, at least one of the fourth inclined surfaces being located between the first inclined surface and the second inclined surface, and at least another of the fourth inclined surfaces being located between the first inclined surface and the third inclined surface, the fourth inclined surfaces having rotational angles around the central axis that are the same as the rotational angle of the first inclined surface, the fourth inclined surfaces having inclination angles to the central axis larger than the inclination angle of the first inclined surface and smaller than the inclination angle of the second inclined surface and the third inclined surface, respectively.