US 11,911,155 B2
Monitoring apparatus and method
Stewart Whiting, Edinburgh (GB); Samuel Moreland, Edinburgh (GB); Hugh Carter, Edinburgh (GB); and Morgan Smith, Edinburgh (GB)
Assigned to CURRENT HEALTH LIMITED, Edinburgh (GB)
Filed by CURRENT HEALTH LIMITED, Edinburgh (GB)
Filed on Jul. 30, 2021, as Appl. No. 17/389,472.
Prior Publication US 2023/0030071 A1, Feb. 2, 2023
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01)
CPC A61B 5/14552 (2013.01) [A61B 5/02438 (2013.01); A61B 5/14557 (2013.01); A61B 5/6824 (2013.01); A61B 5/6831 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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; wherein:
the unit further comprises a housing, the housing comprising an arm-facing portion having an incurvate surface for facing the upper arm, the arm-facing portion comprising a sensitive region protruding from the incurvate surface, and
the first and second light sources and the one or more photodetectors are exposed to the upper arm at the sensitive region, being arranged such that light can pass from the first and second light sources into the upper arm, and light can be received by at least one of the one or more photodetectors from within the upper arm, when the unit is worn on the upper arm.