Abstract: An insertion device for the introduction of a medical implement, the insertion device including a hollow body, a needle holder mounting portion, a needle holder, a needle adapted for a medical implement to be mounted therewith relative to the needle, biasing means to bias the needle and the needle holder into the hollow body, and a retaining mechanism adapted to at least temporarily retain the needle and the needle holder in a forward condition in which the needle extends forward of the hollow body against the biasing force of the biasing means. The retaining mechanism of the insertion device retains the needle and the needle holder in the forward condition until the medical implement is disassociated from the retaining mechanism and unless the retaining mechanism is operated independently to retain the needle holder and the needle in the forward condition.

Abstract: A syringe (100) comprising: a barrel (1), a needle holder (12) that holds a hypodermic needle (14) through a needle opening (102), and a hollow plunger (6), wherein the needle holder (12) is biased away from the needle opening (102) such that when the hollow plunger (6) moves through the injection stroke the needle holder (12) is propelled by the biasing member (13) to retract into the hollow plunger (6).

Abstract: A positive pressure one way medical valve contains an inlet (10), outlet (11), an internal flow path between the inlet and the outlet and a plunger (12) movable between a retraced sealing position, where backflow is reduced or prevented and an extended open position, where fluid can flow from the inlet to the outlet. The plunger is moved from the retraced to the extended position by insertion of a tip onto the inlet (10). A variable volume chamber (23) is defined partially by an elastomeric member (14) that is stretched, when plunger is in the extended position and reduced, when the plunger is in the retraced position so to increase or decrease the volume of the chamber respectively. A valve (50), which is movable between open and closed positions by the presence or absence of fluid passing through the inlet, immediately seals the flow pathway before the plunger is retraced.