×

Hypodermic injection apparatus

  • US 4,596,556 A
  • Filed: 03/25/1985
  • Issued: 06/24/1986
  • Est. Priority Date: 03/25/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. 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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×