| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a medical hollow needle with a tapered subordinate ground face at the tip of a cylindrical member and at least part of first-third ground faces formed within the range of the subordinate ground face, and a method of manufacturing the same. <P>SOLUTION: The cylindrical member has the subordinate ground face, ground in the tapered shape on the tip side so that the outer diameter becomes gradually smaller and the wall thickness becomes thinner to the tip of the cylindrical member along the axis of the cylindrical member while the inner diameter is constant. The first ground face ground to be inclined to the axis, and the second and third ground faces ground to be inclined to the axis, rotated at prescribed angles to face each other in the left and right directions relative to the first ground face around the axis on the tip side of the first ground face, are formed in the range where the subordinate ground face of the cylindrical member is formed. An acute tip part is formed by the three ground faces: the second and third ground faces and the subordinate ground face, and a ridgeline part is formed near the acute tip part by crossing the second and third ground faces. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
