System and method for venous pulsation detection using near infrared wavelengths
First Claim
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1. A method for detecting venous pulsation, comprising:
- acquiring a first signal corresponding to absorption at a first near-infrared wavelength from a sensor;
acquiring a second signal corresponding to absorption at a second near-infrared wavelength from the sensor;
deriving an offset metric from the first and second signals with a processor, wherein the offset metric comprises a difference between current and historical values of a ratio-of-ratios of the absorption at the first near-infrared wavelength to the absorption at the second near-infrared wavelength; and
detecting the presence of venous pulsation based on comparing the offset metric with a threshold value and determining whether the offset metric exceeds the threshold value using the processor.
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Abstract
Methods and systems for detecting venous pulsation are provided. In accordance with an exemplary embodiment of the present technique, there is provided a method for detecting venous pulsation, including acquiring a first signal corresponding to absorption at a first near-infrared wavelength, acquiring a second signal corresponding to absorption at a second near-infrared wavelength, deriving an offset metric from the first and second signals, and detecting the presence of venous pulsation based on the offset metric. The method further includes correcting calculations of physiological parameters such as, for example, blood oxygen saturation, when venous pulsation is detected.
225 Citations
21 Claims
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1. A method for detecting venous pulsation, comprising:
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acquiring a first signal corresponding to absorption at a first near-infrared wavelength from a sensor; acquiring a second signal corresponding to absorption at a second near-infrared wavelength from the sensor; deriving an offset metric from the first and second signals with a processor, wherein the offset metric comprises a difference between current and historical values of a ratio-of-ratios of the absorption at the first near-infrared wavelength to the absorption at the second near-infrared wavelength; and detecting the presence of venous pulsation based on comparing the offset metric with a threshold value and determining whether the offset metric exceeds the threshold value using the processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for detecting venous pulsation, comprising:
- a monitor configured to;
acquire a first signal corresponding to absorption at a first near-infrared wavelength and a second signal corresponding to absorption at a second near-infrared wavelength; derive an offset metric from the first and second signals, wherein the offset metric comprises a difference between current and historical values of a ratio-of-ratios of the absorption at the first near-infrared wavelength to the absorption at the second near-infrared wavelength; and detect the presence of venous pulsation based on comparing the offset metric with a threshold value and determining whether the offset metric exceeds the threshold value. - View Dependent Claims (12, 13, 14)
- a monitor configured to;
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15. A system for detecting venous pulsation, comprising:
- a sensor configured to;
emit light at three or more wavelengths into a patient'"'"'s tissue; and
detect absorption of the light; anda monitor configured to; acquire a first signal from the sensor corresponding to absorption at a first near-infrared wavelength and a second signal from the sensor corresponding to absorption at a second near-infrared wavelength; derive an offset metric from the first and second signals, wherein the offset metric comprises a difference between current and historical values of a ratio-of-ratios of the absorption at the first near-infrared wavelength to the absorption at the second near-infrared wavelength; and detect the presence of venous pulsation based on comparing the offset metric with a threshold value and determining whether the offset metric exceeds the threshold value. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- a sensor configured to;
Specification