Telemetry system and method for transmission of ECG signals with heart pacer signals and loose lead detection
First Claim
1. A circuit for transmission of a physiological signal characterized by an ECG signal within a second higher frequency band, said circuit comprising:
- lead means for receiving said physiological signal including said ECG and pacer signals;
separation composition means coupled to said lead means, said separation/composition means for generating a frequency modulated output signal indicative of said ECG signal of said physiological signal, said separation/composition means characterized by a limited slew rate wherein said pacer signal of said physiological signal is substantially deleted from said modulated output signal,pacer detection means coupled to said lead means for detecting said pacer signal included within said physiological signal, wherein said pacer detection means generates and output signal indicative of the presence or absence of said pacer signal within said physiological signal,pulse generator coupled to said pacer detection means and responsive to said output signal from said pacer detection means, said pulse generator is for generating a predetermined pulse flag signal, said pulse flag signal and said modulated output signal of said separation/composition means being summed within said separation/composition means to provide a composite signal characterized by said flag signal and a frequency modulated output signal carried on a first predetermined subcarrier frequency indicative of said ECG signal of said physiological signal,FM transmission means coupled to said separation/composition means for receiving said composite signal, said FM transmission means for frequency modulating said composite signal and transmitting said frequency modulated composite signal, whereby said FM transmission means transmits an FM modulated output signal indicative of said pacer signal of said physiological signal and an FM/FM modulated signal indicative of said ECG signal of said physiological signalwhereby said ECG and pacer signals within said physiological signal are separated and thereafter may be further processed and transmitted.
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Accused Products
Abstract
The invention is a telemetric biomedical system for simultaneously transmitting a pacer pulse together with lower frequency ECG wave forms and a loose lead signal. The loose lead signal is a low frequency signal applied across the skin electrodes which are attached to a patient subject to cardiac monitoring. In the event that such electrodes should become detached or poorly coupled to the patient, the loose lead signal tends to become open circuited across the leads and can be detected. The loose lead signal and ECG wave form since from the patient, is transmitted in an FM/FM modulated signal, while the pacer pulse is separated from the ECG wave form prior to amplification and is simultaneously transmitted as an FM modulated signal. In addition thereto, various alarm signals are transmitted as FM modulated signals with the pacer pulse.
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Citations
7 Claims
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1. A circuit for transmission of a physiological signal characterized by an ECG signal within a second higher frequency band, said circuit comprising:
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lead means for receiving said physiological signal including said ECG and pacer signals; separation composition means coupled to said lead means, said separation/composition means for generating a frequency modulated output signal indicative of said ECG signal of said physiological signal, said separation/composition means characterized by a limited slew rate wherein said pacer signal of said physiological signal is substantially deleted from said modulated output signal, pacer detection means coupled to said lead means for detecting said pacer signal included within said physiological signal, wherein said pacer detection means generates and output signal indicative of the presence or absence of said pacer signal within said physiological signal, pulse generator coupled to said pacer detection means and responsive to said output signal from said pacer detection means, said pulse generator is for generating a predetermined pulse flag signal, said pulse flag signal and said modulated output signal of said separation/composition means being summed within said separation/composition means to provide a composite signal characterized by said flag signal and a frequency modulated output signal carried on a first predetermined subcarrier frequency indicative of said ECG signal of said physiological signal, FM transmission means coupled to said separation/composition means for receiving said composite signal, said FM transmission means for frequency modulating said composite signal and transmitting said frequency modulated composite signal, whereby said FM transmission means transmits an FM modulated output signal indicative of said pacer signal of said physiological signal and an FM/FM modulated signal indicative of said ECG signal of said physiological signal whereby said ECG and pacer signals within said physiological signal are separated and thereafter may be further processed and transmitted. - View Dependent Claims (2, 3, 4, 5)
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6. A method of monitoring and communicating a physiological signal characterized by a first portion within a first frequency bandwidth and characterized by a second portion within a second higher frequency bandwidth comprising the steps of:
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receiving said physiological signal from a patient; separating said first and second portions of said physiological signal; and communicating said first and second portions of said physiological signal in distinct modulation formats as non-interfering components of an output signal; whereby said second portion of said signal within said second higher frequency bandwidth is received and communicated independently of said first portion of said physiological signal within said first frequency thereby permitting independent signal handling and processing thereof. - View Dependent Claims (7)
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Specification