Patent ID: 9333310
Filing Date: 2016-05-10
CPC Classification: A61M

Claim Text:
1. A sheet driver for use in a medicament dispenser including a medicament carrier having a plurality of pockets for containing medicament wherein said pockets are spaced along a length of and defined between first and second sheets secured to each other and separable by drivable pulling action, said sheet driver comprising (a) a base; (b) extending from said base, a shaft defining a rotational axis; (c) at said base, a drive surface for receipt of drive to rotate the base about said rotational axis; (d) about said shaft, a torsion spring defining first and second spring legs; (e) mounted about the shaft and said torsion spring for rotation about the rotational axis, a hub defining a hub surface for receipt of at least one of the first or second sheets of said medicament carrier, wherein a first leg receiver of the base receives said first spring leg of the torsion spring and a second leg receiver of said hub receives said second spring leg of the torsion spring such that relative rotation of the base and the hub results in tensioning of the torsion spring, wherein the hub surface is adapted to provide an initial effective winding surface, and the tensioning of the torsion spring compensates for an increase in the effective winding surface of the hub caused by receipt of said at least one of the first or second sheets of said medicament carrier about the hub, and wherein the hub is mounted to the base with the torsion spring wound to an initial tensed state and the hub and the base are configured so that the torsion spring is unable to unwind from this initial tensed state.