Patent ID: 6969374

Claim:
An injection syringe comprising: a syringe housing, having a forward end and a rearward end, for receiving a medicament ampule that is provided with a sealing member; a plunger movable in a longitudinal direction of the syringe housing for pressing the sealing member into the medicament ampule; a holder, connected to the forward end of the syringe housing, for receiving an injection needle unit, wherein the injection needle unit comprises a hub-shaped cannula support detachably insertable into the holder, wherein the cannula support has a rearward end provided with a radially outwardly oriented flange ring, and wherein a cannula is inserted into the cannula support so as to project to the front and to the rear of the cannula support; a spreading sleeve comprising a cylinder ring fastened on the syringe housing and further comprising elastic spreading tongues provided with forward ends remote from the cylinder ring; wherein the spreading tongues have radially inwardly oriented noses engaging the flange ring when the injection needle unit is inserted into the holder; wherein the spreading sleeve comprises at least four of the spreading tongues forming an annular cage; an outer sliding sleeve surrounding the spreading sleeve and movable against a force of a spring in a rearward direction away from the forward end of the syringe housing; wherein the sliding sleeve has a front end provided with an annular adjusting element, wherein the adjusting element, upon movement of the sliding sleeve in the rearward direction, pushes the spreading tongues radially outwardly.