Pen injector with resetting mechanism for receiving new cartridge during driver decoupling and proximal spindle retraction

摘要

A resettable dose setting mechanism for a drug delivery device comprising a driver for driving a spindle of the drug delivery device is provided. Said driver comprises a first component and a second component rotationally coupled to said first component. During resetting of said drug delivery device, said first component is rotationally decoupled from said second component.

主权项

1. A resettable dose setting mechanism for a drug delivery device comprising a driver for driving a spindle of the drug delivery device device in a distal direction to cause a distal end of the spindle to act on a bung within a cartridge, said driver comprising a first component and a second component rotationally coupled to said first component, wherein during resetting of said drug delivery device, that is during preparation of the dose setting mechanism for receiving a new cartridge, said first component is decoupled from said second component such that the first component can rotate relative to the second component,
wherein during a dose setting operation the first and second components are coupled together to rotate together in unison relative to an outer housing and the spindle when a user dials a dose of medicament for administration causing the driver to move axially in a proximal direction, the dose setting mechanism further comprising a dose limiter wherein during resetting of said drug delivery device to add the new cartridge, said dose limiter is reset to an initial position and the spindle retracts axially in the proximal direction.