Dose detection module for a medication delivery device

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 an axis of rotation during dose delivery;
• a sensed element attached to and rotationally fixed with said dose setting member, said sensed element including alternating first and second surface features radially-spaced about the axis of rotation of said dose setting member, the surface features facing radially;
• an actuator attached to said device body, said actuator being axially and rotationally fixed with said dose setting member in a first operating mode during dose setting, said actuator being non-rotatable relative to said device body in a second operating mode during dose delivery, said sensed element and said dose setting member rotating relative to said actuator during dose delivery in relation to the amount of dose delivered;
• a rotation sensor attached to said actuator during dose delivery, said rotation sensor including an axially extending following member attached to said rotation sensor, the following member including a contact portion resting against and spring-biased in a direction of the first and second surface features of said sensed element, the contact portion being positioned to move over the surface features during rotation of said sensed element relative to said actuator during dose delivery, said rotation sensor being responsive to the movement of the contact portion over the surface features to detect the rotation of the dose setting member;
• a module removably attached to said actuator, said module including said rotation sensor;
• and
• a controller responsive to said rotation sensor to determine the amount of dose delivery based on the detected rotation of said dose setting member relative to said actuator during dose delivery,
• in which said module includes an inner wall defining a compartment and an outer wall surrounding the inner wall, the following member extends distally between the inner and outer walls.

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 an axis of rotation during dose delivery;
• a sensed element attached to and rotationally fixed with said dose setting member, said sensed element including alternating first and second surface features radially-spaced about the axis of rotation of said dose setting member, the surface features facing radially;
• an actuator attached to said device body, said actuator being axially and rotationally fixed with said dose setting member in a first operating mode during dose setting, said actuator being non-rotatable relative to said device body in a second operating mode during dose delivery, said sensed element and said dose setting member rotating relative to said actuator during dose delivery in relation to the amount of dose delivered;
• a rotation sensor attached to said actuator during dose delivery, said rotation sensor including an axially extending following member attached to said rotation sensor, the following member including a contact portion resting against and spring-biased in a direction of the first and second surface features of said sensed element, the contact portion being positioned to move over the surface features during rotation of said sensed element relative to said actuator during dose delivery, said rotation sensor being responsive to the movement of the contact portion over the surface features to detect the rotation of the dose setting member;
• a module removably attached to said actuator, said module including said rotation sensor;
• and
• a controller responsive to said rotation sensor to determine the amount of dose delivery based on the detected rotation of said dose setting member relative to said actuator during dose delivery,
• in which the surface features comprise alternating projections and recesses, the contact surface of the following member riding against the projections and recesses during rotation of said sensed element relative to said actuator during dose delivery, and in which the projections face radially outward of said dose setting member.

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 an axis of rotation during dose delivery;
• a sensed element attached to and rotationally fixed with said dose setting member, said sensed element including radially spaced conductive portions radially-spaced about the axis of rotation of said dose setting member, in which the conductive portions face radially outward of said sensed element;
• an actuator attached to said device body, said actuator being axially and rotationally fixed with said dose setting member in a first operating mode during dose setting, said actuator being non-rotatable relative to said device body in a second operating mode during dose delivery, said sensed element and said dose setting member rotating relative to said actuator during dose delivery in relation to the amount of dose delivered;
• a rotation sensor attached to said actuator during dose delivery, said rotation sensor including first and second conductors attached to said actuator, the first and second conductors respectively including first and second contact portions resting against and spring-biased in the direction of the conductive portions of said sensed element, the contact surfaces being positioned to move over the conductive portions during rotation of said sensed element relative to said actuator during dose delivery, said sensed element having coupled conditions relative to said actuator with a conductive portion directly electrically coupling the first and second conductors, said sensed element having uncoupled conditions relative to said actuator with the conductive portions not directly electrically coupling the first and second conductors, said rotation sensor being responsive to the coupled and uncoupled conditions to detect the rotation of the dose setting member;
• and
• a controller responsive to said rotation sensor to determine the amount of dose delivery based on the detected rotation of said dose setting member relative to said actuator during dose delivery.