Dose counting in metered dose inhaler
First Claim
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1. A counter for indicating the number of doses left in a canister that is suitable for use in a metered dose inhaler, comprising:
- a module for providing an indication of the number of doses left in the canister; and
a triggering mechanism for updating the indication in response to activation of the inhaler;
whereby the counter is affixed to the canister.
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Abstract
A counter for indicating the number of doses left in a canister that is suitable for use in a metered dose inhaler. The counter is affixed to the canister and includes a module for providing an indication of the number of doses left in the canister and a triggering mechanism for updating the indication in response to activation of the inhaler.
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Citations
24 Claims
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1. A counter for indicating the number of doses left in a canister that is suitable for use in a metered dose inhaler, comprising:
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a module for providing an indication of the number of doses left in the canister; and
a triggering mechanism for updating the indication in response to activation of the inhaler;
whereby the counter is affixed to the canister. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A metered dose inhaler, comprising:
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a canister assembly including a canister and a cap that is affixed to the canister and houses a counter for indicating the number of doses left in the canister; and
an actuator body for accommodating the canister assembly and for providing an inhalation air pathway. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of over-travel management in a metered dose inhaler comprising:
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providing a counter for indicating the number of doses left in a canister that is suitable for use in the metered dose inhaler, a triggering mechanism for updating the counter in response to activation of the inhaler, the triggering mechanism further comprising at least one plunger and a spring for actuating the switch in response to motion of the canister;
depressing the canister; and
actuating the triggering mechanism wherein the spring accommodates over-travel of the plunger.
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Specification