Patent US 5,583,566

A medical instrument interfacing apparatus including a video instrument for outputting a video signal on which the pattern information of at least one of a character and device is superimposed, a video signal transmitting apparatus for transmitting the video signal of the video instrument, a pattern discriminating apparatus for extracting the pattern information from the video signal transmitted from the video signal transmitting apparatus and a controlled instrument in which the signal of the pattern discriminating apparatus is input.