Body organ stimulator with interference rejector

Claim 1

A body organ stimulator comprising: a. a pulse generator that is adapted to be connected to the body and that has a timing network which effects stimulating signals with a predetermined period, b. detector means for detecting body signals comprised of natural signals, or artificial pace signals, and combinations thereof, and for producing corresponding detector output signals, c. an interference signal rejector comprising: i. a resistor network comprising first and second circuits, ii. a coupling capacitor connected between said detector means and said resistor network to receive detector output signals directly from said detector means corresponding with the detected body signals and said capacitor being charged to a predetermined voltage level at one rate through said first circuit of said resistor network and to be discharged at a different rate through said second circuit of said resistor network, iii. a signal level sensing device connected at the junction of said coupling capacitor and said resistor network for sensing a voltage on said resistor network which corresponds to the difference between the detector output signal and the voltage on said coupling capacitor, the voltage on said capacitor depending on the repetition rate of the detector output signals which charge it and the voltage on the resistor network during occurrence of a detector output signal depending on the level to which the capacitor is discharged between such signals, iv. said signal level sensing device having different output states depending on the magnitude of the difference between the detector output signal and the voltage on said coupling capacitor, said signal level sensing device having a first output state when the detector output signals have a repetition rate within certain limits, and having a second output state when the detector output signals have a repetition rate outside the certain limits, d. switching means responsive to one state of said signal level sensing device by being nonconductive and to another state by being conductive, and e. a capacitor connected to said switching meAns and said pulse generator, operation of said pulse generator depending on the voltage on said capacitor resulting from conduction or nonconduction of said switching means and the state of said level sensing device.