Electronic acupuncture point finder

Claim 1

In an electronic acupuncture point finder having a point finder probe, a grabber electrode, means, such as an audio or visual means, for indicating to an operator a change in body impedance as the point finder probe is passed over the patient's skin, and a voltage supply means, the improvement comprising a balancing network including at least two pairs of fixed impedance elements connected across said voltage supply means for effecting a voltage division between each of said pair of impedance elements, a selective amplifier circuit connected across said balancing network between each pair of fixed impedance elements thereof, said selective amplifier circuit having at least two inputs and means for comparing the electrical signals to said two inputs and selectively producing an amplifier signal only when the difference between said inputs are of a preselected value, and a sensitivity adjustment circuit electrically interconnecting said point finder probe and grabber electrode to one input of said selective amplifier circuit, said sensitivity adjustment circuit having circuit means for adjusting the voltage level to the input of said amplifier circuit to which said sensitivity adjustment circuit is connected for any given body impedance presented between said point finder probe and grabber electrode whereby said amplifier circuit is only turned on for producing an amplified signal when said body impedance is below a preselected value, said means for indicating an impedance change to an operator being driven by the amplified signal from said selective amplifier circuit.