3797489 is referenced by 115 patents and cites 9 patents.

A hypodermic injection device is provided comprising a cylindrical holder closed at one end and slidably carrying an ampoule with attached cannula facing the closed end of the holder, medicament is provided in the ampoule between the cannula and the piston in the ampoule, a gun spring assembly is associated with the holder and in operative association with the ampoule to force the ampoule and attached cannula forward thus driving the cannula out of the closed end of the holder and into the locus of injection, and a counterbalancing spring is positioned in the holder between the closed end thereof and the cannula end of the ampoule to counteract the gun spring force.

Hypodermic injection device with shock absorbing spring
Application Number
Publication Number
Application Date
February 10, 1972
Publication Date
March 19, 1974
Sarnoff Stanley J
Witherspoon and Lane
Survival Technology
A61m 05/24
A61m 05/20
A61M 05/32
A61M 05/20
A61M 05/24
A61M 05/28
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