Monitoring apparatus and method
AssigneeCurrent Health Limited
InventorsStewart Whiting, Samuel Moreland, Hugh Carter, Morgan Smith
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Abstract
An apparatus for monitoring blood oxygen saturation of a subject is provided. The apparatus includes a unit configured for wearing on the subject's upper arm, the unit comprising first and second light sources configured to emit light of first and second wavelengths and a photodetector configured to detect light of the first and second wavelengths, where the light sources are arranged to direct light into the upper arm and the photodetector is arranged to detect light reflected from within the upper arm.
Claims8
A method of monitoring blood oxygen saturation of a subject using an apparatus for monitoring blood oxygen saturation of a subject, the apparatus comprising:
- a unit configured for wearing on the subject's upper arm, the unit comprising:
- a first light source configured to direct light of a first wavelength towards the upper arm when the unit is worn on the upper arm;
- a second light source configured to direct light of a second wavelength towards the upper arm when the unit is worn on the upper arm, the second wavelength being different to the first wavelength;
- and
- one or more photodetectors, each configured to output at least one detected light signal indicative separately of detection of light of the first wavelength and light of the second wavelength reflected from within the upper arm when the unit is worn on the upper arm;
- one or more processors;
- and
- a memory including instructions which, when executed by the one or more processors, causes the apparatus to:
- determine an indicator of blood oxygen saturation of blood in the upper arm, in dependence on the at least one detected light signal;
- and
- output the indicator of blood oxygen saturation,
- and the method comprising:
- causing the first and second light sources to direct light towards the upper arm;
- causing at least one of the one or more photodetectors to detect reflected light and to thereby output at least one detected light signal indicative separately of detection of light of the first wavelength and light of the second wavelength reflected from within the upper arm, wherein detection of light of the first wavelength is determined independently from detection of light of the second wavelength;
- processing the at least one detected light signal to thereby determine an indicator of blood oxygen saturation of blood in the upper arm;
- and
- wherein the method further comprises determining how much the indicator of blood oxygen saturation varies across a measurement period and outputting the determined indicator of blood oxygen saturation only when the indicator is indicative of a change of less than ±5 percent within a measurement period of at least 8 seconds.
Dependencies are inferred from the claim text.