Abstract: A hypodermic injection system utilizes disposable medicament ampules having self-contained needles operated by a re-useable actuator to extend the needle from complete enclosure within the ampule out and into the flesh and inject the medicament as it moves, the needle automatically retracting into the disposable ampule after exhausting its contents, completely eliminating any need to handle the exposed needle before or after use. The post-injection needle retraction operation is powered by the reuseable actuator, avoiding the expense of prior devices which incorporate the retraction mechanism in the disposable ampule. The invention is useful to health professionals and also of particular utility to diabetics and others who must regularly self-inject.

Abstract: An injector system utilizes a disposal ampule or, in one instance, a disposal syringe, in all cases being characterized by "tracked" injection wherein the medicament within the ampule or syringe is dispensed as a linear function of needle penetration, and the complete injection operation is executed such that the needle is never exposed. The needle is withdrawn within the medicament chamber after use where it cannot injure anyone except in one instance, in which the needle is capped after the plunger spindle is snapped to prevent reuse of the syringe. The objectives of the improvements are comfort to the patient, ease of use by the administrator and safety for all involved.

Abstract: A medical injector system includes a hypodermic ampule having a body, a piston sealingly forwardly movable therein for defining a medicament chamber, a pierceable seal closing a front extremity of the ampule, a needle movably axially supported by the piston and biased rearwardly toward a retracted, cocked position. An actuator removably receives the ampule, and has a spring-loaded plunger for advancing the needle, and then the piston, whereby the needle reaches an extended position, medicament being injected from the needle during the forward movement of the piston. When the plunger is released, it retracts from the needle and the piston, the needle automatically retracting into the ampule for preventing accidental injury and contamination that might otherwise result from having the used needle in an exposed position.

Abstract: A medical injector apparatus includes a syringe having a barrel with a lateral projection, a needle, a plunger in the barrel having a portion extending from the barrel opposite the needle.

Abstract: A safety injector, primarily for self-administered medicaments, is adapted to hold a charged hypodermic syringe and its needle with the needle in a protected retracted position. When a trigger member of the injector is pressed against the skin of the patient, the needle is exposed for producing shallow penetration of the skin, then a plunger actuator is released for producing a forward movement of the syringe a limited distance to cause full penetration by the needle and a coordinated forward movement of the syringe plunger to force medicament from the syringe through the needle in a "tracked injection." A safety mechanism prevents release of the plunger actuator unless the syringe is fully seated within the injector.

Abstract: A method of an apparatus for hypodermically injecting at least two liquid medicaments which are kept separate from each other until use, and then causing them to be merged into a single pressurized flow stream in the lumen of a single hypodermic needle. Also, a liquid medicament ampule for plural medicaments, and a hypodermic needle carried in the ampule and isolated from the medicament compartments until use, to prevent possible corrosion of the needle by either or both of the medicaments.

Abstract: A hypodermic injection device including an injector and a medicament and needle ampule wherein the needle is initially isolated from a possibly corrosive medicament, but wherein the needle is movable to a position in flow communication with the medicament only at the moment of injection, and an injector device into which the ampule can be loaded under controlled conditions of needle entry force and depth, medicament entry into tissue being accomplished while the needle is moving in its penetration of tissue.

Abstract: A self-contained predetermined dosage hypodermic ampule with enclosed sterile needle projected by a companion injector device from the sealed forward end of the ampule, with liquid medicament pressurizing means for dispensing the medicament from the needle and into the tissue of the patient during penetration of the tissue by the needle, all portions of the length of the needle being hygienically sealed from external contamination at all times; the companion injector means having simply operated and dependable safeguards against accidental operation, and the injector means and hypodermic needle cooperating to insure smooth, non-sticking operation of the medicament pressurizing means.