公开(公告)号：US20240392465A1

公开(公告)日：2024-11-28

申请号：US18694584

申请日：2022-09-22

Applicant: NIPRO CORPORATION

Inventor： Daisuke KIMURA ,  Yutaka EIZUMI ,  Kenji KUROKAWA ,  Masato KANEKO

IPC: C25F7/00 ,  C25F3/24

Abstract: Provided is a novel manufacturing method for a conical hollow needle that makes it possible to efficiently form a conical part that has a nearly perfectly circular outer circumferential surface shape. The present invention is a method of manufacturing a conical hollow needle that has a conical part that has a tapered outer circumferential surface. The manufacturing method involves immersing a hollow needle having a straight shape in an electrolyte solution to conically electropolish an outer circumferential surface. From a start to an end of the electropolishing, the hollow needle, which serves as an anode, is sandwiched between a pair of cathodes at a prescribed distance therefrom in a radial direction, and the hollow needle is rotated around a needle axis thereof to change which faces of the hollow needle are opposite to the cathodes.