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John W Keller Jr, William E Bursack, Alan Coombes: Mutually noninterfering transcutaneous nerve stimulation and patient monitoring. Stimtech, Audley A Ciamporcero Jr, May 25, 1982: US04331157 (48 worldwide citation)

Transcutaneous electrical nerve stimulation is applied to the patient, as though electrocardiograph monitoring is not being practiced. The EKG signals are preprocessed through a selective sample and hold module, which performs amplification, comparison with selective frequency and amplitude standard ...


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John W Keller Jr: Electronic pain control with scanned output parameters. Stimtech, Audley A Ciamporcero Jr, July 1, 1980: US04210151 (40 worldwide citation)

A first oscillator dictates the pulse duration and frequency of stimulating signals; the oscillator output wave form is coupled to an output amplifier stage, and thence to the patient. A scanning oscillator provides a substantially linear ramp voltage, which in turn controls pulse duration, pulse fr ...


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John W Keller Jr, Dennis Digby, Alan Coombes: Programmer for implanted pacer. Biotronik Mess und Therapiegerate & Co, Spencer & Kaye, July 8, 1980: US04211235 (30 worldwide citation)

A plurality of programming bits are placed into a parallel in-serially out register. When the programmer is activated, a monostable resets a counter, and energizes an oscillator which clocks the counter. Three subintervals from the counter are utilized for pulse width modulation of the programming s ...


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Norman R Hagfors, John W Keller Jr: Electronic tissue stimulator with output signal controls. Stimtech, Audley A Ciamporcero Jr, December 9, 1980: US04237899 (23 worldwide citation)

In a transcutaneous nerve stimulating apparatus, the stimulating pulse wave form is shaped and manipulated to accommodate specific physiological parameters, and to allow multiple non-interfering electrode administrations. The stimulating pulse wave form, of desired pulse rate, pulse duration, and pu ...


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John W Keller Jr, Dennis Digby, Alan Coombes: Security maintenance for programmable pacer reprogramming. Biotronik Mess und Therapiegerate & Co, Spencer & Kaye, May 20, 1980: US04203447 (10 worldwide citation)

A counter functions in response to an oscillator to control generation of stimulating pulses in the demand mode, via an adjustable rate decoder. The rate decoder may be predetermined under the control of a dual input, a first of which is a magnetic enabling switch, and the second of which is a pulse ...


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John W Keller Jr: Programmably variable voltage multiplier for implanted stimulator. Biotronik Mess und Therapiegerate & Co, Spencer & Kaye, May 20, 1980: US04203448 (7 worldwide citation)

A free running oscillator clocks a counter, which produces stimulation control signals at a predetermined counter. An output stage includes transistors, energized by the counter, to issue stimulating pulses having a voltage equal to that across a capacitor in parallel with the output stage. The outp ...


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Dennis Digby, John W Keller Jr: Demand pacer with programmable rate hysteresis. Biotronik Mess und Therapiegerate & Co, Spencer & Kaye, October 2, 1979: US04169480 (6 worldwide citation)

A demand pacer has a local memory element, programmable from a remote source, which detects whether or not the hysteresis rate adjustment is to be employed. When hysteresis is disabled, the pacer operates in the normal demand mode, at a rate optionally selected by the same memory. In the hysteresis ...


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John W Keller Jr: Programmable pacer with variable amplifier sensitivity and pacing rate. Biotronik Mess und Therapiegerate & Co, Spencer & Kaye, May 13, 1980: US04202342 (4 worldwide citation)

An implanted receiver-decoder stores program bits corresponding to rate alteration and to input amplifier sensitivity. The former bits operate a rate decoder which in turn is responsive to predetermined outputs of a fixed rate oscillator-counter. The input amplifier is connected to the intermediate ...


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