Apparatus for observing cardiac rhythm free of interfering effects
First Claim
1. Apparatus for observing cardiac rhythm free of interfering effects, comprising:
- a high frequency electric wave generator;
a pair of current feed electrodes connected in circuit with said high frequency generator for placement on the chest of a patient to be examined at locations suitable for forming a pulmonary rheographic signal and for feeding high frequency current through the patient'"'"'s body;
a pair of exploratory electrodes for placement on the chest of said patient at locations suitable for picking up a rheocardiographic signal;
first detecting means connected to said exploratory electrodes for detecting and amplifying said rheocardiographic signal;
second detecting means connected to said current feed electrodes for detecting said pulmonary rheographic signal and for amplifying it to substantially the same amplitude at which it appears superimposed on said rheocardiographic signal in the output of said first detecting means, andsubtracting means connected to the outputs of said first and second detecting means for eliminating said superimposed pulmonary rheographic signal from said rheocardiographic signal and providing the latter as an output which is undisturbed by said pulmonary rheographic signal.
0 Assignments
0 Petitions
Accused Products
Abstract
A cardiac rhythm observation apparatus that separates and then provides for correlation of cardiographic and electrocardiographic signals has four electrodes for attachment to the chest of a subject. Two of the electrodes connect a high-frequency current for application to the subject. The other two electrodes disposed between the first two are connected to a channel for detecting, filtering and forming a rheocardiographic signal, which channel is connected to a heartbeat counter proper. A channel for eliminating variations in pulmonary impedance is connected to the feed electrodes and delivers a pulmonary rheographic signal to a stage in the detecting channel in which the pulmonary rheographic signal is substracted from the raw rheographic signal. A correlation stage is provided for correlation either with the separated electrocardiographic signal or with stimulation pulses.
-
Citations
4 Claims
-
1. Apparatus for observing cardiac rhythm free of interfering effects, comprising:
-
a high frequency electric wave generator; a pair of current feed electrodes connected in circuit with said high frequency generator for placement on the chest of a patient to be examined at locations suitable for forming a pulmonary rheographic signal and for feeding high frequency current through the patient'"'"'s body; a pair of exploratory electrodes for placement on the chest of said patient at locations suitable for picking up a rheocardiographic signal; first detecting means connected to said exploratory electrodes for detecting and amplifying said rheocardiographic signal; second detecting means connected to said current feed electrodes for detecting said pulmonary rheographic signal and for amplifying it to substantially the same amplitude at which it appears superimposed on said rheocardiographic signal in the output of said first detecting means, and subtracting means connected to the outputs of said first and second detecting means for eliminating said superimposed pulmonary rheographic signal from said rheocardiographic signal and providing the latter as an output which is undisturbed by said pulmonary rheographic signal. - View Dependent Claims (2, 3)
-
-
4. Apparatus for observing cardiac rhythm free of interfering effects, comprising:
-
a high frequency electric wave generator; a pair of current feed electrodes connected in circuit with said high frequency generator for feeding high frequency current through a patient'"'"'s body; a pair of exploratory electrodes for placement on the chest of said patient at locations suitable for picking up a rheocardiographic signal; means connected to said exploratory electrodes for separating said rheocardiographic signal from an electrocardiographic signal and cardiac stimulation pulses and for providing said rheocardiographic signal at a first output and said electrocardiographic signal and, if present, cardiac stimulation pulses, at a second output; means responsive to said first output of said separating means for demodulating said rheocardiographic signal and for producing a train of pulses representative thereof; means responsive to said electrocardiographic signal and, if present, said cardiac stimulation pulses, for producing trains of correlating pulses respectively representative thereof and including a selector switch for selecting correlation pulses representative either of said electrocardiographic signal or of cardiac stimulation pulses, and correlation means having a first input connected to the output of said demodulation and pulse-producing means and a second input connected to said selector switch, for eliminating pulses representative of said rheocardiographic signal which are not time-correlated with one of said correlation pulses.
-
Specification