| 摘要 |
<p>A medical, bevel-shaped puncture needle (1) is provided such that squeezing work is applied to the fore-end part of a hollow round columnar part (2) of a needle blank (10) to form a hollow conical part (3) that is tapered off from the hollow round columnar part towards the tip thereof, and cutting work is then applied to the needle blank (10) to form a cutting face (4) crossing the needle axis (C) diagonally, with the fore end (5) thereof being located on the outer circumference of the hollow conical part and the rear end (6) thereof being located on the outer circumference of the hollow round columnar part. The tip angle of the puncture needle (1) in a plane containing the tip thereof and the needle axis, is the sum of an inclination angle &thetas;, relative to the needle axis (C), of the cutting face (4), and an inclination angle phi , relative to the needle axis (C), of a generatrix of the hollow conical part (3), that inclines towards the opposite side of the cutting face (4); and the direction of the bisector of the tip angle in which the puncture needle (1) proceeds when penetrating, coincides with, or is in close proximity to, the direction of needle axis. <IMAGE></p> |
