A drug delivery method for effective drug application is disclosed in this invention. In this method, a micro-carrier delivers an encapsulated, desired drug directly to targeted sites without significant interactions with other components in the biological system in the pathway. In one embodiment, a micro-carrier containing encapsulated drug is first delivered to the general area for treatment. It then scans the area and selectively attaches itself the cell site or organ location to be treated. Finally, the desired drug contained in the micro-carrier is released to the attached cell or organ. In another embodiment, a micro-device is first used to process the general area to be treated to enhance differentiation in properties (such as surface charge) between healthy cells and unhealthy cells (such as cancer cells). Drug encapsulated in the micro-carrier is next applied to preferentially attach onto the targeted sites (such as cancer cell sites) to be treated. Finally, drug is released from the micro-carrier onto the sites to be treated. Such micro-carrier preferably contains multiple functions comprised of at least two functions from the group of sensing, analyzing, logic processing, surface treatment, position detection, motion, injecting, delivering, cutting functions, removing functions, biodegradation and disintegration.La présente invention concerne un procédé dadministration de médicaments. Un micro-véhicule administre un médicament encapsulé directement à des sites ciblés sans interactions significatives avec dautres composants dans le système biologique. Dans un mode de réalisation, un micro-véhicule est dabord mis en place dans la région générale de traitement. Il balaie alors la région et se fixe sélectivement au site cellulaire ou à lorgane à traiter. Enfin, le médicament souhaité contenu dans le micro-véhicule est libéré vers le site fixé. Dans un autre mode de réalisation, un micro-dispositif est dabord utilisé pour traiter la région générale afin d
