Patent ID: 11950895
Assignee: INFINEON TECHNOLOGIES AG
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 22:
23. A wearable device comprising:
a millimeter-wave radar configured to:
transmit a plurality of a plurality of radar signals towards a surface of a skin,
receive a plurality of reflected radar signals, and
generate a displacement signal indicative of a distension of the surface of the skin based on the reflected radar signals;

a temperature sensor configured to determine temperature values indicative of measured temperatures of the surface of the skin; and
a controller configured to:
during a calibration time interval,
cause the millimeter-wave radar to apply electromagnetic energy to the skin to cause an increase in temperature of the skin,
collect a plurality of distension values from the displacement signal, the plurality of distension values associated with a respective plurality of the temperature values determined using the temperature sensor, the plurality of the temperature values indicative of the temperature increase of the skin caused by the applied electromagnetic energy, and
determine compensation coefficients associated with the plurality of the temperature values, and

after the calibration time interval,
collect a first distension value from the displacement signal, the first distension value associated with a respective first temperature value of the temperature values, wherein the first distension value is separate from the plurality of distension values, and the first temperature value is separate from the plurality of the temperature values,
determine a blood pressure based on the first distension value, the first temperature value, and the determined compensation coefficients.