| CPC A61B 5/02116 (2013.01) [A61B 5/7435 (2013.01); A61B 2562/0247 (2013.01)] | 13 Claims |
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1. An apparatus for estimating blood pressure, the apparatus comprising:
a sensor part having a photoplethysmography (PPG) sensor configured to measure a PPG signal from an object of a user, and a force sensor configured to measure a contact force between the object and the PPG sensor;
a display, which before the PPG signal is measured, is configured to output first guide information indicating a predetermined number of times the user is required to touch the sensor part and indicating a contact time of each contact, wherein the predetermined number of times is one of three to nine times; and
a processor configured to estimate the blood pressure of the user by using the PPG signal based on the number of times that the sensor part has been touched since the first guide information is output, corresponding to the predetermined number of times the user is required to touch,
wherein in response to the measured contact force increasing above a first value within a first time, and then decreasing below a second value within a second time, the processor is further configured to determine that the sensor part is touched once,
wherein in response to the contact force not exceeding the first value within the first time, the display is further configured to output second guide information indicating that the user is required to press the sensor part using a force greater than or equal to the first value,
wherein the second guide information comprises a text graphic object and an image graphic object for guiding the object to press the sensor part, and
wherein the image graphic object comprises a first graphic object representing the first value, a second graphic object representing an actual contact force of the user, and a third graphic object for guiding the user to press the sensor part with a greater force.
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