CPC A61M 5/31585 (2013.01) [A61M 5/31526 (2013.01); A61M 5/31528 (2013.01); A61M 5/31568 (2013.01); A61M 2005/3126 (2013.01); A61M 2205/581 (2013.01)] | 20 Claims |
17. A drive mechanism for a medicament delivery device, comprising:
an activation rod comprising activation rod threads;
an activation knob rotationally locked with the activation rod;
a non-rotating axially slidable drum;
a dose drum rotationally locked relative to the activation rod, where the dose drum is configured to rotate relative to the slidable drum;
an indicator drum comprising indicator drum threads; and
a plunger rod comprising a hollow portion configured to accept and allow axial movement of a proximal end of the activation rod;
wherein rotation of the activation knob in a first direction causes concurrent first rotation of the activation rod and the dose drum to axially displace the activation knob, the activation rod, the dose drum and the slidable drum in a distal direction, where the axial movement of the slidable drum causes simultaneous movement the indicator drum which causes a second rotation of the indicator drum.
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