Non-invasive cardiorespiratory monitor with synchronized bioimpedance sensing
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United States of America Patent
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Feb 8, 2000
Grant Date -
N/A
app pub date -
Feb 6, 1998
filing date -
Feb 6, 1998
priority date (Note) -
Expired
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Abstract
A cardiorespiratory monitor that generates bioimpedance sensing signals that produce substantially no interference with bioimpedance signals generated by implanted devices. The monitor detects the bioimpedance signal generated by the implanted device, using a voltage detector or a telemetry circuit, for example. The monitor analyzes this detected signal to generate a bioimpedance sensing signal that will not interfere with the sensed signal. For instance, if the monitor produces a pulsed sensing signal, the pulses are delivered in an interval of the detected signal where no pulses are present. Similarly, if the monitor produces a high frequency AC sensing signal, the zero crossings of the AC sensing signal are positioned during the delivery of a pulse by the implanted device.
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