Non-invasive cardiorespiratory monitor with synchronized bioimpedance sensing
First Claim
1. A device, comprising:
- means for detecting pulses generated by an implanted device; and
means for sensing impedance in a torso between the pulses generated by the implanted device.
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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.
110 Citations
20 Claims
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1. A device, comprising:
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means for detecting pulses generated by an implanted device; and
means for sensing impedance in a torso between the pulses generated by the implanted device. - View Dependent Claims (2, 3, 4)
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5. A device, comprising:
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a pulse detector, where the pulse detector is adapted to detect pulses from an impedance sensor of an implantable device;
a processing circuit coupled to the pulse detector, where the processing circuit analyzes the detected pulses to determine parameters of the detected pulses and to calculate a sampling interval based on the parameters; and
a current injection and sampling circuit, where the current injection and sampling circuit injects current pulses at the sampling interval in synchronization with the pulses from the impedance sensor of the implantable device. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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detecting an impedance signal with an implantable device;
detecting pulses in the impedance signal;
analyzing the detected pulses to determine parameters of the detected pulses;
calculating a sampling interval based on the parameters; and
delivering current pulses at the sampling interval in synchronization with the pulses from the impedance sensor of the implantable device. - View Dependent Claims (16, 17, 18, 19, 20)
processing the impedance signal and the ECG signal to produce indications of cardiorespiratory function.
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19. The method of claim 18, which includes displaying the indications of cardiorespiratory function on a display screen.
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20. The method of claim 18, which includes displaying heart rate, stroke volume, cardiac output and/or minute ventilation as the indications of cardiorespiratory function on a display screen.
Specification