Dose indicator device

摘要

A dose indicator device for a pressurized metered dose inhaler comprises an inner wheel, annular outer wheel, actuator and housing;
the inner wheel comprising primary indexing teeth and a flexible drive arm;the outer wheel comprising secondary indexing teeth on an outer face of the outer wheel;the inner wheel and outer wheel located at least partially within the housing such that the inner wheel and outer wheel are rotatable about a common longitudinal axis of rotation;the actuator movable in a plane perpendicular to the axis of rotation to engage the primary indexing teeth to rotate the inner wheel;the housing being fixed relative to the axis of rotation and comprising a deflector;the deflector configured such that, on rotation of the inner wheel, the drive arm is intermittently deflected and brought into contact with the secondary indexing teeth to rotate the outer wheel about the axis of rotation.

主权项

1. A dose indicator device for a pressurized metered dose inhaler comprising:
an inner wheel, an annular outer wheel, an actuator and a housing; the inner wheel comprising a plurality of primary indexing teeth and a flexible drive arm; the annular outer wheel comprising a plurality of secondary indexing teeth on an outer face of the annular outer wheel; the inner wheel and the annular outer wheel being located at least partially within the housing such that the inner wheel and the annular outer wheel are rotatable about a common longitudinal axis of rotation; the actuator being movable in a plane perpendicular to the longitudinal axis of rotation to engage the primary indexing teeth of the inner wheel to rotate the inner wheel; the housing being fixed relative to the longitudinal axis of rotation and comprising a deflector; the deflector being configured such that, on rotation of the inner wheel, the flexible drive arm is intermittently deflected by the deflector and is thereby brought into contact with the secondary indexing teeth so as to rotate the annular outer wheel about the longitudinal axis of rotation; wherein the housing further comprises a first flexible restraint which engages the inner wheel to restrain rotation of the inner wheel when not being rotated by the actuator and a second flexible restraint which engages the annular outer wheel to restrain rotation of the annular outer wheel when not being rotated by the inner wheel; and wherein the second flexible restraint is engageable with the secondary indexing teeth of the annular outer wheel; wherein the actuator is provided on an actuator member, said actuator member being movable by a dispensing container of a pressurized metered dose inhaler into an indexing position on actuation of the pressurized metered dose inhaler to engage the actuator with the primary indexing teeth of the inner wheel to rotate the inner wheel; and wherein said actuator member is biased away from the indexing position such that the actuator is disengaged from the primary indexing teeth when the pressurized metered dose inhaler is in a non-dispensing position.