Sanofi
Piston rod for a drug delivery device and drug delivery device comprising a piston rod

Abstract:

A piston rod for a drug delivery device includes a first thread with a first inner diameter and a second thread with a second inner diameter. The first inner diameter of the first thread is smaller than the second inner diameter of the second thread. The first thread includes a first pitch and the second thread includes a second pitch. The first and the second pitch have the same magnitude.