Medication delivery device with rotation sensor

A medication delivery device comprising:

• a device body;
• a dose setting member attached to said device body and rotatable relative to said device body about a first axis of rotation during dose delivery;
• a sensed element rotationally fixed with said dose setting member, said sensed element including first gear teeth radially-spaced about the first axis of rotation of said dose setting member, said sensed element and said dose setting member being rotatable relative to said device body during dose delivery in relation to an amount of dose delivered;
• a rotation sensor attached to the device body proximal to the sensed element and is non-rotatable relative to the device body during dose delivery, said rotation sensor including second gear teeth radially-spaced and rotatable about a second axis of rotation, the second gear teeth being operatively received by the first gear teeth of said sensed element such that the second gear teeth are driven in rotation about the second axis of rotation as the first gear teeth rotate about the first axis of rotation during rotation of said sensed element relative to said device body during dose delivery, said rotation sensor being responsive to the rotation of the second gear teeth to detect the rotation of the dose setting member;
• and
• a controller responsive to said rotation sensor to determine the amount of rotation based on the detected rotation of said dose setting member relative to said device body during dose delivery, in which said rotation sensor comprises a multi-turn potentiometer.

A medication delivery device comprising:

• a device body;
• a dose setting member attached to said device body and rotatable relative to said device body about a first axis of rotation during dose delivery;
• a sensed element rotationally fixed with said dose setting member, said sensed element including first gear teeth radially-spaced about the first axis of rotation of said dose setting member, said sensed element and said dose setting member being rotatable relative to said device body during dose delivery in relation to an amount of dose delivered;
• a rotation sensor attached to the device body proximal to the sensed element and is non-rotatable relative to the device body during dose delivery, said rotation sensor including a shaft distally extended about a second axis of rotation, second gear teeth attached to the shaft and radially-spaced and rotatable about the second axis of rotation, the second gear teeth being operatively received by the first gear teeth of said sensed element such that the second gear teeth are driven in rotation about the second axis of rotation as the first gear teeth rotate about the first axis of rotation during rotation of said sensed element relative to said device body during dose delivery, said rotation sensor being responsive to the rotation of the second gear teeth to detect the rotation of the dose setting member;
• and
• a controller responsive to said rotation sensor to determine the amount of rotation based on the detected rotation of said dose setting member relative to said device body during dose delivery.