The present invention relates to a method and apparatus for encoding or decoding a video signal. The composition can advantageously be manufactured by fluidized bed granulation. A positioning device is adapted for positioning an image sensor according to the present invention in the mouth of a patient. Also described are methods for making an implantable or insertable medical device, for administering a therapeutic agent to a patient, and for modulating the release rate of a therapeutic agent. The high voltage battery charged by series charger can be connected in parallel with a second high voltage battery to enable charging all cells of the second battery together.