Abstract: A one-way valve assembly can be fitted to the end of a syringe to allow fluid to flow from the syringe and into a body cavity but to prevent backflow. The valve assembly is opened by insertion of the luer tip of the syringe into the assembly inlet. The valve has an internal elastic member that forms a variable volume internal chamber. This chamber expands upon insertion of the luer tip into the inlet and shrinks when the luer tip is removed from the assembly. The shrinking action creates a positive pressure in the valve assembly to prevent backflow.

Abstract: A single use syringe uses a “pinching” action between a specially designed plunger and a specially designed needle holder to shoot the needle back into the syringe body upon completion of the piston stroke. The needle is not biased by a helical spring and the syringe remains in an unbiased condition until the plunger is pushed against the needle holder that creates the pinching action to shoot the needle back into the syringe body.

Abstract: A one way valve assembly has an inlet and an outlet, the inlet forming one end of a tubular passageway, a valve member which is slideable along the tubular passageway between a closed position where fluid is unable to flow through the valve assembly, and an open position, the valve member having an outer end and an inner end, and biasing means to bias the valve member to the closed position, characterized in that when the valve member is in the closed position, the outer end is substantially at the inlet of the valve assembly to close of the tubular passageway and to allow the inlet area to be sterilized.

Abstract: A single use syringe (10) has a needle (14) which is brased back into the barrel (11) but which is prevented from doing so by a holding means (26) which has an outer part (25) and an inner part (27) which are connected together by a frangible portion (29). The needle (14) is held by the inner part (27). When the plunger (13) is pushed towards the front of the barrel (11), it contacts the outer part (25) pushes it forwardly which stretches the frangible portion (29) until it bursts. When the frangible portion (29) breaks, the inner portion (27) containing the needle (14) is released and can shoot back into a hollow portion (15) in the plunger (13) through a frangible portion of the plunger head (12).

Abstract: A one way valve assembly has an inlet and an outlet, the inlet forming one end of a tubular passageway, a valve member which is slideable along the tubular passageway between a closed position where fluid is unable to flow through the valve assembly, and an open position, the valve member having an outer end and an inner end, and biasing means to bias the valve member to the closed position, characterized in that when the valve member is in the closed position, the outer end is substantially at the inlet of the valve assembly to close of the tubular passageway and to allow the inlet area to be sterilized.