Pacemaker with circuit for pulse width modulating stimulus pulses in accordance with programmed parameter control states
First Claim
1. A programmable heart pacer for generating stimulus pulses, said pacer having controllable operating parameters, and having a control circuit responsive to an externally generated program signal which is received by said pacer, said control circuit controlling one or more selected operating pacer parameters, each of said parameters having a corresponding control state, comprising:
- generating means for generating one or more parameter signals in a known sequence, said parameter signals corresponding to the control states of selected operating parameters; and
modulating means for pulse width modulating said pacer stimulus pulses with, said selected operating parameter signals, to provide a signal indicative of said control states and thus of one or more operating parameters.
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Accused Products
Abstract
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 states from a pacer circuit and to generate a serial multiple bit word when the pacemaker is switched to a magnetic mode. The shift register is clocked by stimulus timing signals, and the multiple bit word drives a one shot generator, the output of which is combined with the timing pulses to produce pulse width modulated pacing pulses.
180 Citations
6 Claims
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1. A programmable heart pacer for generating stimulus pulses, said pacer having controllable operating parameters, and having a control circuit responsive to an externally generated program signal which is received by said pacer, said control circuit controlling one or more selected operating pacer parameters, each of said parameters having a corresponding control state, comprising:
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generating means for generating one or more parameter signals in a known sequence, said parameter signals corresponding to the control states of selected operating parameters; and modulating means for pulse width modulating said pacer stimulus pulses with, said selected operating parameter signals, to provide a signal indicative of said control states and thus of one or more operating parameters. - View Dependent Claims (2, 3, 4, 5)
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6. A programmable heart pacer for generating stimulus pulses, said pacer having controllable operating parameters, and having a control circuit responsive to an externally generated program signal which is received by said pacer, said control circuit controlling one or more selected operating pacer parameters, each of said parameters having a corresponding control state, comprising:
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a shift register for normally storing data bits representing parameter control states; means for shifting the data in said shift register with stimulus timing pulses to produce a series of data signals; means for generating time delayed signals from said series of said signals; means for adding said stimulus timing pulses and said time delay pulses to get pulse width modulated timing pulses; and means for generating pacing pulses indicative of parameter control states in response to said pulse width modulating timing pulses.
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Specification