Medical Electronics

THE large number of medical electronic devices developed in the past year indicates a rapid expansion of this field. Electronic instruments are important medical tools.Electric phenomena in the human body had long been of interest, but the low signal amplitude made study difficult. After De Forest's development of the triode vacuum tube in 1907, electronic equipment was built to amplify the weak electric signals from the heart and central nervous system, and subsequent advances in electronic technics were applied to problems in various medical fields.About 1932 the American Institute of Electrical Engineers gave formal recognition to the problems . . .