SYRINGE PLUNGER, METHOD OF MANUFACTURING SAME, AND MEDICAL SYRINGE

WIPO Patent Application WO/2018/043356

A1

Provided are a syringe plunger, a method of manufacturing the same, and a medical syringe, with which a degree of welding at a contacting surface of a gasket and a plunger body is uniform, and with which it is possible to prevent the gasket becoming detached from the plunger body, and to prevent the occurrence of shape deformation resulting from positional displacement and strain of the gasket when the plunger body is being mounted onto the gasket. According to the present invention, a syringe plunger 21 is provided with a plunger body 20, a connecting portion 24 provided at a distal end of the plunger body 20, and a gasket 23 a distal end of which is closed and a rear end of which is open, and which accommodates at least a portion of the connecting portion 24 from the rear end side. A recessed portion 27 is provided in a central portion of a distal end surface of the connecting portion 24. The recessed portion 27 is a molten resin receiving portion for receiving molten resin for gasket molding that is supplied when the gasket 23 is being molded, and an inner wall surface of the gasket 23 is welded to the connecting portion 24 at a contacting surface including at least the recessed portion 27.

SUZUKI KEISUKE (JP)
OURA TOMOYUKI (JP)

PCT/JP2017/030602

March 08, 2018

August 25, 2017

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NAIGAI KASEI CO LTD (JP)

A61M5/315; B29C33/42; B29C45/14; B29C45/37

WO2007015469A1

2007-02-08

US20100057014A1	2010-03-04
JP2003159330A	2003-06-03
JPH06327770A	1994-11-29
JPH0557018A	1993-03-09

KOYAMA Yasushi (JP)

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