Drive mechanism for drug delivery device

A drive mechanism for a drug delivery device, preferably for a pen-type injector, the mechanism comprises a spindle (6) movable in a first direction during a delivery step, a splined portion (5, 11) operatively coupled to the spindle (6), and retraction means (12, 15, 16, 17, 20) acting on the splin...

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Bibliographische Detailangaben
Hauptverfasser:	Sendatzki, Gunther, Teucher, Axel, Jugl, Michael
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE
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Beschreibung
Zusammenfassung:	A drive mechanism for a drug delivery device, preferably for a pen-type injector, the mechanism comprises a spindle (6) movable in a first direction during a delivery step, a splined portion (5, 11) operatively coupled to the spindle (6), and retraction means (12, 15, 16, 17, 20) acting on the splined portion (5, 11) at least at the end of the delivery step. Thereby, that after the delivery step the spindle (6) and/or the splined portion (5, 11) is moved in a second direction contrary to the first direction, such that the whole drive mechanism is relieved from stresses.