Patent ID: 11865247
Assignee: NORTON (WATERFORD) LIMITED
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 0:
1. A breath actuated inhaler comprising:
a canister housing;
a canister displaceable within the canister housing across a travel length between end positions, the canister having a metering valve stem, a metering chamber and a drug reservoir, the metering chamber and the drug reservoir being in fluid communication with each other and the canister being displaced from an end position along the travel length when the canister is in a ready-to-fire position;
a dose counter having a dose counter biasing element;
a vacuum chamber external to the metering chamber; and
a drive coupled to the canister and configured to apply variable forces to the canister that include a ready-to-fire force that is in equilibrium with balancing forces from sources that include the dose counter biasing element and the vacuum chamber, when the canister is the ready-to-fire position.