Radio electrocardiograph apparatus

Claim 1

A MEDICAL DIAGNOSTIC RADIO SYSTEM COMPRISING TRANSDUCERS FOR ATTACHMENT TO A LIVING ORGANISM AND TRANSDUCING PHYSIOLOGICAL SIGNALS, AMPLIFIER MEANS FOR AMPLIFYING SAID ELECTRICAL SIGNALS OBTAINED FROM THE TRANSDUCERS, A RADIO TRANSMITTER MODULATED BY SAID AMPLIFIED SIGNALS TO PROPAGATE RADIO SIGNALS CORRESPONDING TO SAID PHYSIOLOGICAL SIGNALS OBTAINED FROM THE BODY TO A REMOTE LOCATION, SAID SYSTEM BEING MINIATURIZED AND CONTAINED WITHIN A SMALL HOUSING ADAPTED TO BE CARRIED BY THE LIVING ORGANISM, A POWERING BATTERY FOR PROVIDING ENERGIZATION OF SAID AMPLIFIER MEANS AND TRANSMITTER, SAID AMPLIFIER MEANS COMPRISING A DIFFERENTIAL TRANSISTOR AMPLIFIER STAGE ENERGIZED BY SAID PHYSIOLOGICAL SIGNALS FROM SAID TRANSDUCERS TO PRODUCE A SINGLE-ENDED OUTPUT SIGNAL, AND INCLUDING A PAIR OF TRANSISTORS INTERCONNECTED IN COMMON MODE FEEDBACK RELATIONSHIP, EACH TRANSISTOR BEING ENERGIZED IN RESPONSE TO A DIFFERENT TRANSDUCER, A SINGLE-ENDED TRANSISTOR AMPLIFIER STAGE BEING ENERGIZED IN RESPONSE TO ONE OF SAID COMMON MODE TRANSISTORS, AND IMPEDANCE DECOUPLING TRANSISTOR STAGES FOR COUPLING SAID TRANSDUCERS TO SAID COMMON MODE TRANSISTORS AND FOR COUPLING SAID SIGNLEENDED TRANSISTOR AMPLIFIER STAGE TO ONE OF THE COMMON MODE TRANSISTORS.