Patent
Artifact rejector for repetitive physiologic-event-signal data
TLDR
In this paper, an artifact rejector is constructed to generate and store repetitive averaged physiologic-event-signal data based upon a substantially stable time relationship between corresponding physiologic event-Signal data and heart-beat-related signal.Abstract:
An artifact rejector for repetitive physiologic-event-signal data generated from electronically-controlled physiologic-event-measuring equipment includes a physiologic-event-signal averager in communication with such physiologic-event-measuring equipment. The artifact rejector is constructed to generate and store repetitive averaged physiologic-event-signal data based upon a substantially stable time relationship between corresponding physiologic-event-signal data and heart-beat-related-signal data. The repetitive averaged physiologic-event-signal data includes less noise than the repetitive physiologic-event-signal data. The artifact rejector generates and continuously updates an averaged-data template by storing such repetitive averaged physiologic-event-signal data for a preselected number of measured physiologic events. The artifact rejector also includes a physiologic-event-noise estimator and a physiologic-event-noise monitor in communication with such physiologic-event-measuring equipment, and capable of instructing the monitor to adjust the measurement cycle based upon estimated, monitored noise. The averager preferably includes a sharp roll-off, low pass filter and examples include a fourth-order Bessel filter, two cascaded, identical second-order Bessel filters, an elliptic filter, a Tchetschebyscheff filter, or finite impulse response filters. The heart-beat-related signal is preferably an ECG signal. A method of artifact rejection includes generating and storing repetitive averaged physiologic-event-signal data based upon a substantially stable time relationship between corresponding physiologic-event-signal data and heart-beat-related-signal data, with the repetitive averaged physiologic-event-signal data including less noise than the repetitive physiologic-event-signal data.read more
Citations
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References
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Patent
ECG synchronized pulse oximeter
TL;DR: In this paper, a pulse oximeter and method of determining the oxygen saturation level of a patient's blood wherein a heartbeat related signal is used, as a reference to guide the averaging of optical pulse waveforms.
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Automatic blood pressure monitor employing artifact rejection method and apparatus
TL;DR: In this article, a blood pressure monitor uses a detector to generate a trigger signal on the occurrence of the R-wave or other point on the ECG waveform, which is then summed with each other over many heartbeats to generate an average oscillometric waveform that is used to determine blood pressure by conventional means.
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Method and apparatus for non-invasive monitoring of central venous pressure
TL;DR: In this article, a method and apparatus for measuring central venous pressure (CVP) along with an improved transducer (50) for measuring CVP in infants was presented.
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Blood pressure monitoring in noisy environments
TL;DR: In this paper, a threshold, based predominantly on a level of noise, is developed and used in the discrimination of detected bilogical signals from detected signals not indicative of blood pressure.