Title:
INJECTION NEEDLE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/111864
Kind Code:
A1
Abstract:
[Problem] To enable manufacturing of an injection needle that has a minimum outer diameter that is smaller than those of conventional injection needles manufactured by performing welding or using a coating layer, and that does not generate a defective product resulting from a weld bead or dripping of the coating layer. [Solution] An injection needle manufacturing method according to the present invention includes a blank formation step (step S30), a stand-up step (steps S31-S33), a curling step (step S34), a core metal insertion step (step S35), and a coining step (step S37). The blank formation step is performed by using a mold obtained by adjusting shapes of a plurality of first projections and the like such that liquid tightness is ensured by caulking in the curling step between the plurality of first projections and a plurality of second recesses and between a plurality of first recesses and a plurality of second projections. A surface of a punch for use in the coining step is provided with a linear projection provided such that the outer surface of a tubular body is crushed at a fixed width along a joint line of the tubular body by the coining step.
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Inventors:
TOKUDA MASAHIDE (JP)
Application Number:
PCT/JP2020/042778
Publication Date:
June 10, 2021
Filing Date:
November 17, 2020
Export Citation:
Assignee:
TOKUDA ARD CO LTD (JP)
International Classes:
B21G1/08; A61M5/158; A61M5/32; B21D5/01; B21D22/02; B21D39/02
Foreign References:
| JP2019134921A | 2019-08-15 | |||
| JP2017100164A | 2017-06-08 | |||
| JPS59179241A | 1984-10-11 | |||
| JP2011115810A | 2011-06-16 | |||
| JP2006280146A | 2006-10-12 | |||
| JP2004336979A | 2004-11-25 | |||
| JP2002095224A | 2002-03-29 |
Attorney, Agent or Firm:
KUROSE Yasuyuki (JP)
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