Combined light source photoacoustic system
First Claim
1. A photoacoustic method for determining a physiological parameter, the method comprising:
- providing a pulsed photonic signal to a subject from a first light source;
providing a modulated photonic signal to the subject from a second light source;
detecting a first acoustic pressure signal and a second acoustic pressure signal from the subject, wherein the first acoustic pressure signal is caused by absorption of at least some of the pulsed photonic signal by the subject and the second acoustic pressure signal is caused by absorption of at least some of the modulated photonic signal by the subject;
determining a first physiological parameter based on the first acoustic pressure signal; and
determining a second physiological parameter, different from the first physiological parameter, based on the second acoustic pressure signal.
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Accused Products
Abstract
A physiological monitoring system may use photoacoustic sensing to determine one or more physiological parameters of a subject. The photoacoustic system may use two light sources (e.g., a high power pulsed laser diode and a continuous wave laser diode) to generate acoustic pressure signals in a subject. One or more light sources (e.g., the high powered pulsed laser diode) may provide a high signal-to-noise ratio. The high signal-to-noise ratio signals may provide high sensitivity for physiological measurements (e.g., cardiac output and temperature measurements). The photoacoustic system may use high powered light sources in combination with other light sources to improve physiological measurements.
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Citations
23 Claims
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1. A photoacoustic method for determining a physiological parameter, the method comprising:
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providing a pulsed photonic signal to a subject from a first light source; providing a modulated photonic signal to the subject from a second light source; detecting a first acoustic pressure signal and a second acoustic pressure signal from the subject, wherein the first acoustic pressure signal is caused by absorption of at least some of the pulsed photonic signal by the subject and the second acoustic pressure signal is caused by absorption of at least some of the modulated photonic signal by the subject; determining a first physiological parameter based on the first acoustic pressure signal; and determining a second physiological parameter, different from the first physiological parameter, based on the second acoustic pressure signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A photoacoustic system for determining a physiological parameter, the system comprising:
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a first light source configured to provide a pulsed photonic signal comprising a first wavelength of light to a subject; a second light source configured to provide a modulated photonic signal comprising a second wavelength of light, different from the first wavelength of light, to the subject; at least one acoustic detector configured to detect a first acoustic pressure signal and a second acoustic pressure signal from the subject, wherein the first acoustic pressure signal is caused by absorption of at least some of the pulsed photonic signal by the subject and the second acoustic pressure signal is caused by absorption of at least some of the modulated photonic signal by the subject; and processing equipment communicatively coupled to the acoustic detector, the processing equipment configured to determine a first physiological parameter based on the first acoustic pressure signal and to determine a second physiological parameter, different from the first physiological parameter, based on the second acoustic pressure signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification