Multi-stage biodegradable drug delivery platform

A method for delivery of a multi dose vaccine regimen, wherein all of the doses of vaccine are inserted into a patient's body at the same time, the method comprising:

• lodging a vaccine delivery platform beneath the skin of a patient, the platform containing at least a first and second dosage of vaccine;
• the first dosage contained in a first biodegradable structure, the second dosage contained in a second biodegradable structure, the second structure configured to have a longer period of in vivo biodegradation for release of its vaccine dosage than the first structure;
• biodegrading the first structure in vivo over a first period of time until the integrity of the first structure is degraded sufficiently to release the first vaccine dosage;
• releasing the first vaccine dosage into the tissue of the patient;
• biodegrading the second structure in vivo over a second period of time until the integrity of the second structure is degraded sufficiently to release the second vaccine dosage;
• and
• releasing the second vaccine dosage into the tissue of the patient after release of the first vaccine dosage.