ENERGIZING IMPLANTABLE TRANSMITTERS BY MEANS OF COUPLED INDUCTANCE COILS

In the study of energizing implantable oscillators by coupling of inductance coils, it is pointed out that the best stability is not necessarily obtained where the magnetic flux density takes its maximum. The conversion of the induced ac voltage to a useful dc voltage can be made in conventional rectifier circuits, but great improvement in operation and economy is offered by transistor rectifier circuits. Two types of transistor rectifiers—the common-base and the common-collector arrangements—are discussed in detail. As one example of several interesting applications, an implantable circuit for long-term transmission of myoelectric potentials through the skin has been developed, principally intended for myoelectric control purposes. Copyright 1969 by the Institute of Electrical and Electronics Engineers, Inc.