Non-reusable hypodermic syringe

Details Non-reusable hypodermic syringe Non-reusable hypodermic syringe

A - Human Necessities

61

M

128/88

A61M 5/178 (2006.01) A61M 5/31 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2035015

PATENT 189/173 ABSTRACT OF THE DISCLOSURE A single use disposable hypodermic syringe having a hollow elongated barrel portion, a piston and sealing engagement with an axially translatable along the barrel portion, a piston rod secured to the piston and projecting from the rearward end of the barrel portion for use in reciprocating the piston, a walled chamber disposed proximate the forward end Or the barrel portion and plug means disposed in the chamber and moveable therein from a rearward position to a forward position in response to liquid being forced against the plug member by the piston. The plug member defines fluid passages therein to follow fluid flow about the plug member and an annular flange which cooperates with the interior surface Or the chamber for maintaining the plug member in the rearward position upon air being passed through the fluid passages in response to translation of the piston within the barrel portion. The annular flange also cooperates with a second portion of the chamber wall for permanently maintaining the plug member in the forward position upon the plug member being moved to the forward position by the liquid during ejection thereon from the syringe With the plug member in the forward position, the annular flange thereon seals the fluid passages upon the piston being retracted within the barrel portion toward the rearward and thereof to prevent any additional liquid from being aspirated into the barrel portion Or the syringe about the plug member thereby rendering the syringe non-reusable. MAN/2540

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