초록 ▼

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 defin

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. An actuator is mounted to the body and is manually operable for selectively operating the gas-releasing means to drive the plunger from its ready toward its spent position to discharge medication from the apparatus and into the patient.

대표청구항 ▼

In a pressure-operated hypodermic injection apparatus including a body and an actuator mounted on the body, a replaceable, medication-discharging ampule unit comprising: an elongate shell having inwardly facing wall means characterized by a substantially uniform cross-sectional configuration along a

In a pressure-operated hypodermic injection apparatus including a body and an actuator mounted on the body, a replaceable, medication-discharging ampule unit comprising: an elongate shell having inwardly facing wall means characterized by a substantially uniform cross-sectional configuration along a defined length portion of said shell, said shell further defining a discharge aperture adjacent a forward end thereof; a plunger slideably and sealingly disposed within said define length portion in said shell, displaceable between a rearward, ready position, spaced one distance from said aperture, and a forward, spent position closer to said aperture than said ready position; said shell and plunger, with the latter in said ready position defining an ampule chamber capable of containing dischargeable medication; and a compressed-gas containing cartridge operable under the influence of the apparatus actuator to drive said plunger and reciprocate with said plunger from said ready position toward said spent position.