Apparatus and method for trans-round window membrane drug delivery

A system to deliver a fluid to the inner ear, comprising:

• a micropump configured for implantation in a patient, the micropump comprising:
• at least one first layer comprising a drug reservoir configured to store a compound, a fluid storage capacitor, and a plurality of channels between the drug reservoir and the fluid storage capacitor;
• at least one second layer comprising a pump coupled with a reservoir inlet of the drug reservoir to pump the compound from the drug reservoir through a reservoir outlet of the drug reservoir through an outlet of the micropump;
• and
• a membrane separating the at least one first layer from the at least one second layer;
• and
• a cannula comprising:
• a first end coupled with the outlet of the micropump;
• and
• a second end comprising a stopper configured to seat into a round window and enable a tip of the cannula to be inserted through a round window membrane and into a cochlea of the patient a predetermined distance.