Congenital heart disease monitor
First Claim
1. A congenital heart disease monitor comprising:
- a sensor including a plurality of light emitters configured to emit optical radiation having a plurality of wavelengths into a tissue site and a detector configured to detect the optical radiation after attenuation by pulsatile blood flowing within the tissue site;
a patient monitor configured to drive the sensor, receive a sensor signal corresponding to the detected optical radiation and to generate at least one of a visual output and an audio output responsive to the sensor signal; and
a digital signal processor within the patient monitor programmed to derive an oxygen saturation from sensor data responsive to the sensor signal,wherein the oxygen saturation is measured first at a baseline tissue site using the sensor including the plurality of light emitters and the detector and second at a comparison tissue site using the same sensor including the same plurality of light emitters and detector,wherein the processor is configured to determine a difference in oxygen saturation measurements between the baseline tissue site and the comparison tissue site, the difference measured over a time interval so as to determine a trend, the processor further configured to compare a trend slope to a trend threshold; and
wherein at least one of the outputs indicates a potential congenital heart disease condition according to results of the comparison.
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Accused Products
Abstract
A congenital heart disease monitor utilizes a sensor capable of emitting multiple wavelengths of optical radiation into a tissue site and detecting the optical radiation after attenuation by pulsatile blood flowing within the tissue site. A patient monitor is capable of receiving a sensor signal corresponding to the detected optical radiation and calculating at least one physiological parameter in response. The physiological parameter is measured at a baseline site and a comparison site and a difference in these measurements is calculated. A potential congenital heart disease condition in indicated according to the measured physiological parameter at each of the sites or the calculated difference in the measured physiological parameter between the sites or both.
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Citations
14 Claims
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1. A congenital heart disease monitor comprising:
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a sensor including a plurality of light emitters configured to emit optical radiation having a plurality of wavelengths into a tissue site and a detector configured to detect the optical radiation after attenuation by pulsatile blood flowing within the tissue site; a patient monitor configured to drive the sensor, receive a sensor signal corresponding to the detected optical radiation and to generate at least one of a visual output and an audio output responsive to the sensor signal; and a digital signal processor within the patient monitor programmed to derive an oxygen saturation from sensor data responsive to the sensor signal, wherein the oxygen saturation is measured first at a baseline tissue site using the sensor including the plurality of light emitters and the detector and second at a comparison tissue site using the same sensor including the same plurality of light emitters and detector, wherein the processor is configured to determine a difference in oxygen saturation measurements between the baseline tissue site and the comparison tissue site, the difference measured over a time interval so as to determine a trend, the processor further configured to compare a trend slope to a trend threshold; and wherein at least one of the outputs indicates a potential congenital heart disease condition according to results of the comparison. - View Dependent Claims (2, 3, 4, 5)
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6. A method of monitoring a patient comprising the steps of:
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emitting optical radiation having a plurality of wavelengths into a tissue site using a sensor; detecting the optical radiation after attenuation by pulsatile blood flow within the tissue site using a detector; deriving an oxygen saturation measurement from sensor data responsive to the detected radiation; wherein the oxygen saturation is measured first at a baseline tissue site using the sensor including the plurality of light emitters and the detector and second at a comparison tissue site using the same sensor including the same plurality of light emitters and detector, determining a difference in oxygen saturation measurements between the baseline tissue site and the comparison tissue site, the difference measured over a time interval so as to determine a trend, and further comparing a trend slope to a trend threshold; and indicating a potential congenital heart disease condition according to results of the comparison. - View Dependent Claims (7, 8, 9)
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10. A congenital heart disease monitor comprising:
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means for emitting optical radiation having a plurality of wavelengths into a tissue site using a sensor; means for detecting the optical radiation after attenuation by pulsatile blood flow within the tissue site using a detector; means for deriving an oxygen saturation measurement from sensor data responsive to the detected radiation; wherein the oxygen saturation is measured first at a baseline tissue site using the sensor including the plurality of light emitters and the detector and second at a comparison tissue site using the same sensor including the same plurality of light emitters and detector, means for determining a difference in oxygen saturation measurements between the baseline tissue site and the comparison tissue site, the difference measured over a time interval so as to determine a trend, and further comparing a trend slope to a trend threshold; and means for indicating a potential congenital heart disease condition according to results of the comparison. - View Dependent Claims (11, 12, 13, 14)
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Specification