Patent ID: 6692468
Filing Date: 2004-02-17
Classification: A61M

Abstract:
A medical syringe includinga barrel with an ejection port at one end and a chamber holding a reservoir of liquid comprising, an internal partition member within said barrel that at least partially defines a channel terminating at the ejection port, a moveable tubular element seated within the channel and has an end nearby the injection port, a fluid passageway which allows the liquid to flow from the chamber into the tubular element, a plunger seated within the tubular element, having an end in the tubular element to which is attached a seal, said seal fitting snug against the tubular element to grip said tubular element and, in response to movement of the plunger, to move the tubular element between a first position where the injection port is sealed and the passageway is blocked to prevent liquid in the chamber from passing into the tubular element, and a second retracted position where the passageway is unblocked to allow liquid in the chamber to flow from the chamber through the passageway into the tubular member, said plunger as it is moved from the second retracted position towards the ejection port forcing any liquid in the tubular element out the injection port.