1
Robert A Walters: Implantable digital cardiac pacer having externally selectible operating parameters and "one shot" digital pulse generator for use therein. ARCO Medical Products Company, Richard A Bachand, September 20, 1977: US04049004 (76 worldwide citation)

An implantable cardiac pacer is instructable to vary the stimulation pulse interval, the stimulation pulse width, the stimulation pulse amplitude, the pacer sensitivity, the refractory period and the mode (demand or asynchronous).


2
Steve A Kolenik, Robert A Walters: Programmable tachycardia pacer. Arco Medical Products Company, John C Martin Jr, January 1, 1980: US04181133 (67 worldwide citation)

A programmable implantable pacer is provided for performing the dual functions of demand pacing as well as standby tachycardia breakup. A command parameter control is used for programmably controlling parameters of the pacer operation as well as of the tachycardia recognition and response to same. U ...


3
Robert A Walters: Pacemaker with circuit for pulse width modulating stimulus pulses in accordance with programmed parameter control states. ARCO Medical Products Company, Bard Groves Sroufe Ryerson & Jackson, January 26, 1982: US04312354 (64 worldwide citation)

An implantable pacemaker having circuit means for indicating, by pulse width modulation of the delivered pacing pulses, the programmable control states which control the selected pacemaker operating perameters. The circuitry includes a parallel to serial shift register adapted to receive the control ...


4
Robert A Walters, Steve A Kolenik: Method and means for receiving parameter control data in an implantable heart pacer. ARCO Medical Products Company, John C Martin Jr, November 21, 1978: US04126139 (27 worldwide citation)

A heart pacer employing a digital parameter controlling circuit is controlled by data received from an external source, the data preferably being in the form of magnetic pulses of width corresponding to the desired logic state of the parameter controlling signal. The externally transmitted signal wh ...


5
Robert A Walters: Cardiac pacer with rate limiting means. ARCO Medical Products Company, John C Martin Jr, August 2, 1977: US04038991 (13 worldwide citation)

A cardiac pacer includes means connected to electrodes adapted to be connected to a patient's heart for detecting and amplifying naturally occurring heart pulses. First and second counters are provided to receive periodic pulses from a clock pulse generator to time a refractory period and a stimulat ...


6
Robert A Walters, William L Johnson, Gary W Bivins: Programmable atrio-ventricular pacer. ARCO Medical Products Company, John C Martin Jr, March 11, 1980: US04192316 (10 worldwide citation)

A programmable digital atrio-ventricular pacer is provided whereby a single programming circuit is utilized for providing program control signals for control of separate ventricular and atrial pacing circuits. The atrial stimulus circuitry is controlled by a multiple bit control signal to cause deri ...


7
Robert A Walters, Steve A Kolenik: Digital cardiac pacer. ARCO Medical Products Company, Richard A Bachand, September 20, 1977: US04049003 (6 worldwide citation)

A digital cardiac pacer has an asynchronous interval counter to count clock pulses to establish a stimulation interval at the end of which it produces a pulse for initiating a stimulation pulse. A control counter to which amplified naturally occurring heat pulses or stimulation pulses are applied co ...


8
Robert A Walters, Russell E Hirtz: Circuit for determining the parameter control states of an implanted pacer. ARCO Medical Products Company, John C Martin Jr, February 26, 1980: US04190055 (5 worldwide citation)

A circuit for indicating at a remote location the control states of a fully implantable heart pacer includes a parallel to serial converter which receives the control states from a register which controls the parameters of the associated pacer. When the pacer is switched to an asynchronous or to a m ...


9
Robert A Walters, Russell E Hirtz: Circuit for measuring the refractory period of a heart pacer. ARCO Medical Products Company, Richard A Bachand, May 3, 1977: US04021736 (4 worldwide citation)

A circuit for measuring the refractory period of a heart pacer includes first, second and third monostable multivibrators. The first monostable multivibrator is reset by the reception of a pacer stimulation pulse to produce a state change for a time period longer than the stimulation pulse interval ...


10
Robert A Walters: Circuit for measuring the sensitivity of a cardiac pacer. ARCO Medical Products Company, Richard A Bachand, May 10, 1977: US04023095 (1 worldwide citation)

A circuit for measuring the sensitivity of a cardiac pacer includes a generator for producing a signal which varies as a function of the sine.sup.2 of a predetermined frequency. The signal is generated by an intermediate step of generating a waveform having the value of 1/2 [1-COS(.theta./2)]. The w ...