Modular inhaler adherence monitor

An adherence monitor for attachment to an inhaler having a drug canister, an actuator holding the drug canister, the actuator having a cylindrical body having one end holding the drug canister with a mouthpiece on the opposite end, and a dosing device attached to the drug canister, the dosing device including a front shield surface, the dosing device operable to allow the drug canister to be actuated to release a dose, the monitor comprising:

• a pair of curved side walls that conform to the sides of the cylindrical body of the actuator, each of the side walls having an open front edge and a closed back edge;
• a side arm attached to one of the side walls to overlap the cylindrical body of the actuator, wherein the mouthpiece of the inhaler is accessible and the front shield surface is exposed;
• and
• an electronics housing attached to the closed back edges of the side walls.

An adherence monitor for attachment to an inhaler having a drug canister, an actuator holding the drug canister, the actuator having one end holding the drug canister with a mouthpiece on the opposite end, and a canister cover covering the drug canister, the drug canister operable to be actuated to release a dose, the monitor comprising:

• a body fitting around the canister cover;
• an electronics housing attached to the body;
• an actuation detection sensor operable to sense the drug canister when actuated;
• an inhalation data detection sensor operable to sense air pressure change created by the actuation;
• and
• a controller in the electronics housing coupled to the sensors to record an actuation event.