04596556 is referenced by 389 patents and cites 7 patents.

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.

Title
Hypodermic injection apparatus
Application Number
6/715930
Publication Number
4596556
Application Date
March 25, 1985
Publication Date
June 24, 1986
Inventor
Eugene C Covey
Portland
OR, US
J Thomas Morrow
Beaverton
OR, US
Agent
Kolisch Hartwell & Dickinson
Assignee
Bioject
OR, US
IPC
A61M 5/30
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