Multi-wavelength photon density wave system using an optical switch
First Claim
1. A system comprising:
- a patient monitor configured to;
generate a plurality of single-wavelength photon density wave (“
PDW”
) input signals by modulating a plurality of light sources at one or more modulation frequencies sufficient to produce resolvable photon density waves in pulsatile tissue of a patient;
alternately select one of the plurality of single-wavelength PDW input signals for transmission in series to generate a multi-wavelength PDW input signal;
receive a multi-wavelength PDW output signal resulting after the multi-wavelength PDW input signal is passed through the pulsatile tissue; and
determine a scattering property or an absorption property of the pulsatile tissue based at least in part on a comparison between the multi-wavelength PDW output signal and the multi-wavelength PDW input signal; and
a sensor having an emitter output and a detector input, wherein the emitter output is configured to pass the multi-wavelength PDW input signal into the pulsatile tissue and wherein the detector input is configured to receive the multi-wavelength PDW output signal from the pulsatile tissue of the patient; and
a sensor cable coupled to the sensor and having a first optical cable configured to transmit the multi-wavelength PDW input signal from the patient monitor to the sensor and having a second optical cable configured to transmit the multi-wavelength PDW output signal from the sensor to the patient monitor, wherein the sensor cable comprises no more than two optical cables.
2 Assignments
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Accused Products
Abstract
Multi-wavelength photon density wave (PDW) medical systems, methods, and devices are provided. In one embodiment, a multi-wavelength system may include a sensor, a sensor cable, and a patient monitor. The sensor may have an emitter and a detector configured to pass a multi-wavelength PDW input signal into a patient and receive a resulting multi-wavelength PDW output signal. The sensor cable may couple to the sensor and include two optical cables for transmitting and receiving the multi-wavelength PDW signals. The patient monitor may couple to the sensor cable and generate several single-wavelength PDW input signals by modulating a plurality of light sources. The monitor may include an optical switch configured to time-division multiplex the several single-wavelength PDW wave input signals by selecting one of the single-wavelength PDW signals at one time to produce a multi-wavelength PDW signal which is output from the monitor to the sensor via the sensor cable.
142 Citations
17 Claims
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1. A system comprising:
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a patient monitor configured to; generate a plurality of single-wavelength photon density wave (“
PDW”
) input signals by modulating a plurality of light sources at one or more modulation frequencies sufficient to produce resolvable photon density waves in pulsatile tissue of a patient;alternately select one of the plurality of single-wavelength PDW input signals for transmission in series to generate a multi-wavelength PDW input signal; receive a multi-wavelength PDW output signal resulting after the multi-wavelength PDW input signal is passed through the pulsatile tissue; and determine a scattering property or an absorption property of the pulsatile tissue based at least in part on a comparison between the multi-wavelength PDW output signal and the multi-wavelength PDW input signal; and a sensor having an emitter output and a detector input, wherein the emitter output is configured to pass the multi-wavelength PDW input signal into the pulsatile tissue and wherein the detector input is configured to receive the multi-wavelength PDW output signal from the pulsatile tissue of the patient; and a sensor cable coupled to the sensor and having a first optical cable configured to transmit the multi-wavelength PDW input signal from the patient monitor to the sensor and having a second optical cable configured to transmit the multi-wavelength PDW output signal from the sensor to the patient monitor, wherein the sensor cable comprises no more than two optical cables. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A patient monitor comprising:
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a plurality of light sources configured to simultaneously emit a plurality of wavelengths of light; a driving circuit configured to modulate the plurality of light sources at one or more modulation frequencies sufficient to produce resolvable photon density waves in pulsatile tissue of a patient to produce a plurality of single-wavelength photon density wave (“
PDW”
) input signals; andan optical switch configured to select one of the plurality of single-wavelength PDW input signals at a time at non-overlapping intervals to generate a multi-wavelength PDW input signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
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simultaneously emitting light from a first light source having a first wavelength and from a second light source having a second wavelength; generating a first photon density wave (“
PDW”
) signal by modulating the first light source using a driving circuit;generating a second PDW signal by modulating the second light source using the driving circuit; selecting and transmitting through tissue the first PDW input signal for a first period of time; selecting and transmitting through the tissue the second PDW input signal for a second period of time, wherein the first period of time and the second period of time do not overlap; receiving as a first PDW output signal the first PDW input signal after propagating through the tissue; receiving as a second PDW output signal the second PDW input signal after propagating through the tissue; and comparing the first and second PDW output signals to the respective first and second PDW input signals to determine physiological information using phase detection circuitry, signal processing circuitry, or data processing circuitry.
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Specification