Patent ID: 11872381
Assignee: SANOFI
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 3:
4. The drive train according to claim 1,
wherein the housing includes a longitudinal axis extending from a proximal towards a distal end and a torsional drive spring with a distal spring end non-rotatably engaged to the housing and with a proximal spring end torsionally tensible around the longitudinal axis relative to the housing,
wherein the expelling mechanism comprises a drive sleeve arranged within the housing and rotatable around the longitudinal axis, wherein rotation of the drive sleeve relative to the housing is configured to cause a piston rod to translate relative to the housing, and
wherein the clutch element comprises a cylindrical clutch section and is adapted to releasably non-rotatably couple the proximal spring end of the drive spring with the drive sleeve.