Apparatus and method for measuring, formatting and transmitting combined intracardiac impedance data and electrograms
First Claim
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1. A cardiac apparatus, comprising:
- means for measuring impedance within a patient'"'"'s body;
means for deriving at least one time-varying physiological parameter a function of the measured impedance;
means for selecting samples of said at least one time-varying physiological parameter;
means for formatting the selected samples into a time sequence of digital samples representing the amplitude of said at least one time-varying physiological parameter;
an external monitoring device;
means for transmitting said formatted samples to said external monitoring device;
means for measuring cardiac electrical signals within the patient'"'"'s body;
means for selecting samples of said cardiac electrical signals;
means for formatting the selected electrical signals into a time sequence of digital samples representing the amplitude of said cardiac electrical signals; and
means for combining said at least one physiological parameter time sequence with said cardiac electrical signal time sequences into a combined sequence of digital samples, wherein said transmitting means transmits said combined sequence of digital samples to said external monitoring device, including;
means for encoding said at least one physiological parameter time sequence into a serial data stream of signal bits,means for encoding said cardiac electrical signal time sequence into a time sequence of multiple-bit digital samples wherein the value of each multiple-bit sample corresponds to an instantaneous amplitude of the cardiac electrical signal, andmeans for truncating the multiple-bit digital samples by one bit for each of said at least one physiological parameter sequence and replacing each truncated bit with the single bit of said at least one time varying physiological parameter serial data stream of single bits.
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Abstract
A patient-implantable cardiac stimulation apparatus adapted to measure body impedance, derive at least one physiological parameter from the impedance measurement, sample a time sequence of the physiological parameter and transmit the sequence to an external monitoring device for display and analysis. The apparatus may also sense intracardiac electrograms while it is measuring body impedance and deriving the physiological parameter, in which case it formats and transmits a combined intracardiac electrogram and physiological signal to the monitoring device.
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Citations
18 Claims
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1. A cardiac apparatus, comprising:
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means for measuring impedance within a patient'"'"'s body; means for deriving at least one time-varying physiological parameter a function of the measured impedance; means for selecting samples of said at least one time-varying physiological parameter; means for formatting the selected samples into a time sequence of digital samples representing the amplitude of said at least one time-varying physiological parameter; an external monitoring device; means for transmitting said formatted samples to said external monitoring device; means for measuring cardiac electrical signals within the patient'"'"'s body; means for selecting samples of said cardiac electrical signals; means for formatting the selected electrical signals into a time sequence of digital samples representing the amplitude of said cardiac electrical signals; and means for combining said at least one physiological parameter time sequence with said cardiac electrical signal time sequences into a combined sequence of digital samples, wherein said transmitting means transmits said combined sequence of digital samples to said external monitoring device, including; means for encoding said at least one physiological parameter time sequence into a serial data stream of signal bits, means for encoding said cardiac electrical signal time sequence into a time sequence of multiple-bit digital samples wherein the value of each multiple-bit sample corresponds to an instantaneous amplitude of the cardiac electrical signal, and means for truncating the multiple-bit digital samples by one bit for each of said at least one physiological parameter sequence and replacing each truncated bit with the single bit of said at least one time varying physiological parameter serial data stream of single bits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for monitoring at least one time varying physiological parameter sensed by a device implanted in the patient, said device having:
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means for monitoring a physiological signal, and means for transmitting a representation of the physiological signal to an external monitoring device for display; said method comprising; measuring an impedance within the body of the patient; deriving at least one time varying physiological parameter as a function of the measured impedance; selecting samples of said at least one time varying physiological parameter; formatting said samples of said parameter into a digital time sequence of samples representing the amplitude of said parameter; sensing cardiac electrical signals; sampling and formatting said cardiac electrical signals to generate a time sequence of digital samples representing the amplitude of said cardiac electrical signals; and combining said at least one physiological parameter time sequence with said cardiac electrical signal time sequence into a combined sequence of digital samples and transmitting said combined sequence of digital samples to said external monitor, by; encoding each of said at least one physiological parameter time sequence samples into a serial data stream of single bits, encoding said cardiac electrical signal time sequence into a time sequence of multiple-bit samples wherein the value of each multiple-bit sample corresponds to an instantaneous amplitude of the cardiac electrical signal, and truncating the multiple-bit digital samples by one bit for each of said at least one physiological parameter sequence and replacing each truncated bit with the single bit of said at least one time varying, physiological parameter serial data stream of single bits. - View Dependent Claims (15, 16, 17, 18)
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Specification