Drive system seal

An apparatus for dispensing a medication fluid from a reservoir adapted to contain the fluid, the apparatus comprising:

• a reservoir cavity adapted to receive the reservoir;
• a drive motor;
• a drive gear coupled to the drive motor and adapted to be rotatably actuated by the drive motor;
• at least one plunger slider having one end coupled to the drive gear and the other end releasably coupled to the reservoir, wherein the at least one plunger slider is adapted to be linearly actuated from a retracted position to an extended position to dispense the fluid from the reservoir in response to rotation by the drive gear;
• a sealing ring mounted around the at least one plunger slider;
• and
• a spring disposed within the sealing ring, wherein the sealing ring with the spring disposed therein is adapted to allow the at least one plunger slider to translate from the retracted position to the extended position and to prevent entry of fluid from the reservoir cavity into the drive system.