Patent ID: 6692469
Filing Date: 2004-02-17
Classification: A61M

Abstract:
An injection device formed as two separate assemblies, the first assembly comprising a barrel having forward and rear ends, a syringe carrier for a syringe with a needle within the barrel axially movable between a rearward position, in which the needle of the syringe carried thereby is retracted within the forward end of the barrel, and a forward position, in which the needle projects from the forward end of the barrel, spring means urging the carrier towards the rearward position, and a connector, and the second assembly comprising a firing mechanism with a firing member which, when released, acts on the syringe to urge the syringe forwards to said forward position and then to eject a dose, wherein the firing mechanism is separable from the barrel and in that the connector has limited freedom of axial movement at the rear end of the barrel and is configured for attachment of the firing mechanism, the connector initially being held at a rearward position by the spring means acting through the syringe carrier, but moving to a forward position, taking the syringe carrier with it, as the barrel is held against the skin by the firing mechanism being pressed forwards, the syringe carrier then being in a position intermediate said forward and rearward positions of said syringe carrier from which said syringe carrier can be propelled to said forward position of said syringe carrier on actuation of the firing mechanism, and the connector reverting under the influence of the spring means to said rearward position after removal of the injection device from the skin.