Dose counter for a metered-dose inhaler
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United States of America Patent
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-
Oct 23, 2018
Grant Date -
Sep 27, 2012
app pub date -
Jul 28, 2010
filing date -
Jul 30, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A dose counter for counting does of medicament dispensed by or remaining in a metered-dose inhaler. The dose counter includes a rotatably mounted gear wheel having a circular arrangement of ratchet teeth defining a root circle and a display coupled to the gear wheel, the display having a visible array of dose counting indicia indexable in response to rotary motion of the gear wheel. The dose counter further includes an actuator mechanism having a driver for rotatably driving the gear wheel in response to the dispensation of a medicament dose, the driver being arranged to engage the ratchet teeth of the gear wheel. The actuator mechanism includes an actuator shaft mounted for linear movement in response to the dispensing of a dose of medicament. In use, the travel of the driver along the root circle of the gear wheel exceeds the corresponding linear movement of the actuator shaft.
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