Disposable syringe

Details Disposable syringe Disposable syringe

A - Human Necessities

61

M

A61M 5/178 (2006.01) A61M 5/32 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2412409

A disposable syringe includes a tubular barrier member retained in a rear passageway of a barrel. A tubular needle seat for fixing a needle cannula is retained on the barrier member, and abuts against an abutment wall in the front passageway of the barrel while the needle cannula is disposed outwardly of the barrel. A plunger is slidable in the rear passageway, and has a seal member to seal a cavity confined in a plunger body and containing a fluid at a reduced pressure. When a pushing force applied to the plunger body moves the barrier member against the first and second frictional forces, the needle seat is released, and the seal member is ruptured, so that the needle seat and the needle cannula are suctioned into the cavity due to the pressure difference between the ambient atmosphere and the reduced pressure.

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