Method and apparatus for optical detection of mixed venous and arterial blood pulsation in tissue
First Claim
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1. A method of detecting the presence of mixed venous and arterial blood pulsation in tissue, comprising:
- receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light;
obtaining a measure of a persistent phase difference between the first and second electromagnetic radiation signals;
comparing the measure with a threshold;
detecting the presence or absence of venous pulsation using the comparison; and
indicating the presence of venous pulsation to a caregiver if venous pulsation is present.
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Abstract
A method and device for detecting the presence of mixed venous and arterial blood pulsation in tissue, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light, obtaining a measure of a phase difference between the first and second electromagnetic radiation signals, comparing the measure with a threshold value to form a comparison, and detecting the presence or absence of venous pulsation using the comparison.
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Citations
18 Claims
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1. A method of detecting the presence of mixed venous and arterial blood pulsation in tissue, comprising:
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receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light; obtaining a measure of a persistent phase difference between the first and second electromagnetic radiation signals; comparing the measure with a threshold; detecting the presence or absence of venous pulsation using the comparison; and indicating the presence of venous pulsation to a caregiver if venous pulsation is present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for detecting the presence of mixed venous and arterial blood pulsation in tissue, comprising:
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means for receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light; means for obtaining a measure of a persistent phase difference between the first and second electromagnetic radiation signals; means for comparing the measure with a threshold value to form a comparison; means for detecting the presence or absence of venous pulsation using the comparison; and means for indicating the presence of venous pulsation to a caregiver when venous pulsation is present. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification