Patent attributes
A medication delivery device is disclosed including a rack-and-pinion plunger drive system. The drive system includes an output drive having a pawled end movably coupled with the ratchet teeth of the plunger, and a pinion drive coupled between the housing, the output drive and an actuator. Actuator is longitudinally movable between dose set and delivery positions. Movement of the actuator causes rotation of the pinion drive along the rack to translate the output drive member with the pawled end that is engaged with the plunger ratchet teeth to distally advance the plunger. The device may include one or more of an end of dose mechanism to limit travel of the actuator, a load brake system to stop travel of the plunger under high input forces, a dose detection system, and a dose selector to vary the amount of dose set.
