Patent ID: 7938802

Claim:
An injection device for causing a dose of liquid to be ejected from a needle ( 5 ) at a distal end of a syringe ( 1 ) located within a housing ( 2 ) of the device, the syringe containing a moveable bung ( 4 ) and the syringe being movable relative to the housing by a plunger ( 7 ), whereupon release of an actuating bias member ( 8 ) at a proximal end of the housing moves the syringe from a first position relative to the housing wherein the needle is shrouded by the housing, to a second position relative to the housing wherein the needle projects from a distal end of the housing, the plunger being in the form of a rod with a flexible projecting portion ( 10 ) which, prior to release of said actuating bias member, is situated rearwardly of the proximal end of the syringe, such that a primary movement of the plunger, under the bias of the actuating bias member, causes the projecting portion to bear against the proximal end of the syringe such that the syringe is moved from said first to said second position, whereupon arresting of further movement of the syringe, results in the flexible projecting portion collapsing inwardly so that it enters the syringe, thus enabling the plunger to move forwardly within the syringe, to act upon said bung to compress the liquid within the syringe and cause expulsion of the liquid through the syringe needle.