Implantable device for automatic drug administration

An implantable device for automatic drug administration, the implantable device comprising:

• a housing having a predetermined shape;
• a drug release unit configured to eject a drug to an outside;
• and
• a driving unit configured to drive the drug release unit at preset intervals,
• wherein the drug release unit comprises a drug storage located inside the housing and storing a drug, a drug chamber receiving a predetermined amount of drug from the drug storage and storing the received drug, and a drug release controller configured to fill the drug chamber with a drug received the drug storage and release the drug filled in the drug chamber to the outside, and
• the drug release controller comprises a plunger configured to form one of positive pressure and negative pressure in the drug chamber as the plunger moves, a plunger spring configured to apply a restoring force to a position where the plunger applies presses the drug chamber, and a gear portion connected to the driving unit and configured to rotate at a preset time to drive the drug release unit.