FIELD: medicine.
SUBSTANCE: invention refers to medical equipment, namely to a reflective photoplethysmography apparatus comprising a light source, a light sensor and a boundary layer.
EFFECT: boundary layer comprises a cavity between the source and the sensor to prevent loss of reflection between the device and the skin and to prevent passage of light from the source to the sensor directly through the boundary layer.
7 cl, 5 dwg
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Authors
Dates
2019-10-21—Published
2016-02-26—Filed