Multi-Wavelength Photon Density Wave System Using An Optical Switch
First Claim
1. A system comprising:
- a patient monitor capable of;
generating 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 selecting one of the plurality of single-wavelength PDW input signals for transmission in series to generate a multi-wavelength PDW input signal;
receiving a multi-wavelength PDW output signal resulting after the multi-wavelength PDW input signal is passed through the pulsatile tissue; and
determining a scattering property and/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.
2 Assignments
0 Petitions
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.
12 Citations
20 Claims
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1. A system comprising:
a patient monitor capable of; generating 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 selecting one of the plurality of single-wavelength PDW input signals for transmission in series to generate a multi-wavelength PDW input signal; receiving a multi-wavelength PDW output signal resulting after the multi-wavelength PDW input signal is passed through the pulsatile tissue; and determining a scattering property and/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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A patient monitor comprising:
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a plurality of light sources capable of emitting a plurality of wavelengths of light; a driving circuit capable of modulating 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 capable of selecting 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 (14, 15, 16, 17, 18, 19)
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20. A method comprising:
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generating a first photon density wave (“
PDW”
) signal by modulating a first light source having a first wavelength using a driving circuit;generating a second PDW signal by modulating a second light source having a second wavelength 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, and/or data processing circuitry.
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Specification