Injection device

A device for delivering a plurality of preselected doses of a drug from a loaded syringe having a plunger at a first end and a cannula at a second end, the device comprising:

• a sleeve having a first opening and a cavity sufficiently large to house the syringe and a second opening sufficiently small to retain the syringe while permitting the cannula to extend therethrough and a slotted track having a plurality of staggered longitudinally positions slot portions and transversely positioned slot portions with each transversely positioned slot portion communicating with two longitudinally positioned slot portions;
• a plunger-engaging cap telescopically movable within the sleeve and having a first open end and a plunger cavity for housing the plunger and a second closed end for engaging an end of the plunger and an outwardly extending pin for following the track, placing the sleeve and the plunger cap in a cooperating relationship so that when the syringe is loaded only a single preselected dose of the drug is injectable through the cannula when the plunger cap is pushed inwardly into the cavity of the sleeve the pin follows a longitudinal slot and stops at a transverse slot leaving any remaining amount of the drug within the syringe and placing the sleeve and plunger cap in subsequent cooperation for delivering subsequent preselected doses from the same syringe by moving the pin along the transverse slot until the pin enters a next longitudinal slot.