Abstract: Some embodiments are directed to an adherence monitor for use with a tethered cap inhaler device. The adherence monitor engages the inhaler device, and includes a tether opening located within a housing of the adherence monitor for receiving the tether. The tether opening is in the form of a slot in a base portion of the housing. The path length of the tether around the adherence monitor is kept from being increased, compared to its path length when the adherence monitor is not attached to the inhaler, by having the slot located to allow the tether to pass through the slot. Various sensors of the adherence monitor in various embodiments detect inhaler usage.

Abstract: Some embodiments are directed to an adherence monitor for use with a tethered cap inhaler device. The monitor engages the inhaler device, and includes a tether opening for receiving the tether, so that the path length of the tether around the monitor is minimized or reduced.

Abstract: In one aspect the invention provides an adherence monitoring device for a medication delivery device, the monitoring device including at least one inductive coil sensor which includes at least one inductive controller, at least two inductive coils including a first inductive coil coupled to the housing and a second inductive coil coupled to the housing. The first inductive coil is configured to exhibit a response to an inductive change and provide a first change signal in response to an inductive change, and the second inductive coil is configured to exhibit a response to the inductive change and provide a second change signal in response to the inductive change.