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US 4,730,618 AGranted
Cardiac pacer for pacing a human heart and pacing method
AssigneeSiemens Aktiengesellschaft
InventorsAnders Lekholm, David C. Amundson
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Abstract
A cardiac pacer which generates pacing pulses at a predetermined pacing rate includes a device for making a body activity measurement. The measured body activity signal is non-linearly amplified such that signal portions having higher amplitudes are more amplified than signal portions having lower amplitudes. The non-linearly amplified body activity signal is integrated over a period of time. The predetermined pacing rate is varied dependent on the integrated signal.
Claims10
A cardiac pacer for pacing a human heart in a patient comprising
- (a) means for generating pacing pulses at a predetermined pacing rate;
- (b) means for transmitting the pacing pulses to the heart for pacing;
- (c) means for making a body activity measurement of the patient;
- (d) means for obtaining a body activity signal depending on the body activity measurement, said signal varying according to the body activity level;
- (e) means for non-linearly amplifying all of the body activity signal such that signal portions having higher amplitudes are more amplified than signal portions having lower amplitudes;
- (f) means for integrating the non-linearly amplified body activity signal over a period of time;
- and
- (g) means for varying the predetermined pacing rate dependent on the integrated signal.
5 more elements
A method for pacing a heart in a patient comprising the steps of:
- generating pacing pulses at a predetermined pacing rate;
- transmitting said pacing pulses to said heart for pacing thereof;
- making a measurement of selected body activity of said patient;
- generating a body activity signal in dependence upon said body activity measurement, said body activity signal varying according to the level of body activity of said patient;
- non-linearly amplifying all of said body activity signal by more greatly amplifying portions of said body activity signal having higher amplitudes than portions of said signal having lower amplitudes;
- integrating the non-linearly amplified body activity signal over a selected period of time;
- and
- varying said predetermined pacing rate in dependence on said integrated signal.
5 more elements
Dependencies are inferred from the claim text.