Abstract: The assembly includes an injection device which includes a housing having an ampule-receiving chamber, a gas charge, and means for delivering a predetermined amount of gas to the ampule-receiving chamber. The device includes an injection-counting ring which is received in a groove extending about the housing wherein the ring includes a counting mechanism thereon and is constructed to allow one-way only rotation thereof relative to the housing. The patient-fillable ampule of the invention includes an ampule body having a plunger end and an orifice end, a medication retaining cavity and an elongate plunger which is received in one end of the cavity. An orifice-bearing end cap is fixed to the orifice end of the body. A truncated hypodermic needle is received in the end cap. A removable needle is provided for filling the ampule and allows use of the ampule as a conventional syringe.

Abstract: A non-invasive hypodermic injection device includes a two-stage gas delivery system and a medication containing ampule having a truncated hypodermic needle at one end thereof. An ampule shroud encloses the ampule and maintains separation between the truncated hypodermic needle on the ampule and the skin of a patient being injected.

Abstract: The present invention provides a pressure-operated hypodermic injection apparatus which is particularly suitable for needleless operation. The apparatus includes an elongate shell having an inwardly facing wall with a uniform configuration along a defined length thereof, with the shell further defining a discharge aperture adjacent one end thereof. It further includes a plunger which is slideably disposed within the defined length of the shell, and which is shiftable between a ready position and a spent position, with the spent position being closer to the aperture than the ready position. With the plunger in its ready position, the shell and plunger collectively define an ampule chamber which is capable of containing a dischargeable medication. A pressurized-gas cartridge is mounted to the plunger to shift therewith, and has gas-releasing means which faces away from the discharge aperture. A body is further included which is sealingly and releasably joined to the other end of the shell.