Single use syringe

Details Single use syringe Single use syringe

A - Human Necessities

61

M

A61M 5/50 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2357556

A non-reusable syringe utilizes a liquid-tight seal between a sliding piston assembly within an elongated barrel. The piston assembly comprises a valve assembly comprising a forward valve and a rear valve that separate upon depression of the plunger for expulsion of the liquid contents. The rear valve that a seal with the barrel and the plunger for drawing in of liquid and the forward valve that forms a seal with the barrel and the plunger for expulsion of the liquid. During liquid expulsion, the two valves separate. A bypass is provided on a plug attached to the plunger which prevents a seal from forming without the rear valve being in position: Thus, when the plunger is retracted after the first use, no liquid may be drawn up into the barrel. The syringe may further include a safety barb and closed ends to prevent tampering or manipulation of the piston apparatus in an effort to eliminate the separation of the two valves.

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