Drive mechanism for a drug delivery device and drug delivery device

摘要

The drive mechanism is suitable for a permanent delivery of a drug from a compact drug delivery device, which may be carried on the body. The drive mechanism comprises a flexible advance cable bearing a coupling feature of longitudinal extension. The advance cable is guided by a guide means. A drive means engages the coupling feature and thus enables an advancement of the advance cable according to the guide means. An end piece is provided to push a plug or bung of a cartridge containing a drug, and the end piece is driven by the advance cable. The drive means is permanently engaged with the coupling feature. This allows a permanent advancement of the plug or bung by means of the drive mechanism.

主权项

1. A drive mechanism for a drug delivery device, comprising:
a flexible advance cable bearing a coupling feature of longitudinal extension, a guide means guiding the advance cable, a drive means engaging the coupling feature and thus enabling an advancement of the advance cable according to the guide means, wherein the drive means is provided for a permanent engagement with the coupling feature and where the drive means is a worm or pinion, and the coupling feature is a screw thread, and an end piece, which is provided to push a plug or bung of a cartridge containing a drug and which is driven by the advance cable, the advance cable is provided with balls having an outer diameter that exceeds an outer diameter of the advance cable and corresponds to an inner diameter of the cartridge, and the end piece is pushed by a portion of the advance cable that enters the cartridge.