An automatic needle insertion device for a pen shaped syringe comprising a cartridge holder (2) wherein a cartridge with a drug can be accommodated, and a dose setting and injection part (1) by which a wanted dose may be set an subsequently pressed out from the cartridge by pressing a button (12) projecting...http://www.google.de/patents/US5980491?utm_source=gb-gplus-sharePatent US5980491 - Automatic needle insertion mechanism
