Patent ID: 8721601
Filing Date: 2014-05-13
Classification: A61M

Abstract:
1. A dose setting mechanism for setting a dose to be dispensed from an injection device, comprising: an injection device housing; a setting element axially fixed and rotatably coupled to the housing; and a priming element rotatably mounted in the setting element; wherein the setting element rotates relative to the housing and the priming element in a dose setting movement to set the dose and an axial position of the setting element and the priming element relative to the injection device housing is maintained; wherein the priming element comprises an external threading forming a threaded engagement with an internal threading of the injection device housing, and the priming element turns out of the dose setting mechanism by a rotating and axial movement along the threaded engagement to draw up the set dose; wherein the setting element and priming element each comprises a stop, the stops co-operating upon drawing up the set dose so that the rotating movement of the priming element is relative to the setting element and is restricted by the stops; wherein the setting element comprises a setting lock cam and the priming element comprises a release groove, which aligns with the setting lock cam and the setting lock cam flexes radially inwardly to allow the dose setting movement of the setting element, and wherein when the priming element draws up the set dose, the release groove moves out of alignment with the setting lock cam and prevents the setting movement due to the setting lock cam being prevented from flexing radially inwardly.