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.

Title
Hypodermic injection device with shock absorbing spring
Application Number
05/225,123
Publication Number
3797489
Application Date
February 10, 1972
Publication Date
March 19, 1974
Inventor
Sarnoff Stanley J
Agent
Witherspoon and Lane
Assignee
Survival Technology
IPC
A61m 05/24
A61m 05/20
A61M 05/32
A61M 05/20
A61M 05/24
A61M 05/28
View Original Source