Patent ID: 6196997
Filing Date: 2001-03-06
Classification: A61M

Abstract:
A syringe comprising:a syringe body,a piston sliderably inserted from one end of said syringe body,a smaller-diameter portion formed in the other end of said syringe body,a needle support detachably supported by said smaller-diameter portion,a syringe needle supported by said needle support,a path-through hole formed in said needle support for communicating with a flow passage of said syringe needle and an inside of said syringe body,a stopper formed on a tip portion of said smaller-diameter portion for preventing said needle support from slipping off in the other end direction of said syringe body,a locking projection projecting from a tip an the axis center direction of said piston, anda locking hole disposed on a side of said position of said needle support for engaging with said locking projection when said piston is pressed in;wherein, in said syringe constituted such that said syringe needle, after said locking projection is inserted into said locking hole by pressing in said piston, is drawn into the inside of said syringe body together said needle support and stored there by pulling out said piston,a locking piston structure for preventing said needle support form slipping off in one end direction of said syringe body is provided between an inner peripheral face of said smaller-diameter portion and an outer peripheral face of said needle support, anda seal structure for preventing liquid leak in the engaging portion of said locking structure is formed, and when said locking projection is inserted into and engaged with said locking hole, said locking projection and said locking hole are formed in such a shape that said needle support is deformed and the inner peripheral face of said smaller-diameter portion is expanded in the radial direction so as to be able to disengage the engagement of said locking structure.