A safety injection device, such as a hypodermic needle, for dispensing liquid from a cartridge in quantities determined by the length of a plunger which may be selectively adjusted in one position only of the plunger. The plunger comprises first and second threadedly connected sections cooperating with...http://www.google.de/patents/US5591136?utm_source=gb-gplus-sharePatent US5591136 - Injection device
