US Patent 11771839 Medicament delivery device

A medicament delivery device is presented having a drive configured to act on a medicament container for expelling a medicament; a holder configured to hold said drive in a pre-tensioned state; an activator configured to interact with said holder for releasing said drive from the pre-tensioned state; wherein the device further includes a feedback mechanism configured to interact both with said holder and with said drive for generating an audible and/or tactile and/or visual signal indicating that the medicament has been completely expelled.