| CPC A61B 5/02225 (2013.01) [A61B 5/02108 (2013.01); A61B 5/7275 (2013.01); A61B 5/02416 (2013.01); A61B 5/681 (2013.01); A61B 5/6815 (2013.01); A61B 5/6898 (2013.01); A61B 2562/0247 (2013.01)] | 12 Claims |
|
1. An apparatus for estimating blood pressure, comprising:
a first sensor configured to obtain a pulse wave signal of a green wavelength and a pulse wave signal of an infrared wavelength from an object when the object is in contact with the first sensor;
a second sensor configured to measure an external force applied to the second sensor while the first sensor is obtaining the pulse wave signal of the green wavelength and the pulse wave signal of the infrared wavelength; and
a processor configured to:
obtain a direct current (DC) component of the pulse wave signal of the green wavelength as a green PPG DC signal;
identify a change in the green PPG DC signal as the external force increases over time;
obtain a first oscillometric envelope representing a blood amount in a blood vessel per unit force by dividing the green PPG DC signal by the external force;
obtain a second oscillometric envelope based on the pulse wave signal of the infrared wavelength and the external force measured by the second sensor;
obtain a first mean arterial pressure (MAP) feature value, a first diastolic blood pressure (DBP) feature value, and a first systolic blood pressure (SBP) feature value based on a peak value of the first oscillometric envelope;
obtain a second MAP feature value, a second DBP feature value, and a second SBP feature value based on a peak value of the second oscillometric envelope; and
estimate the blood pressure based on a combination of the first MAP feature value and the second MAP feature value, a combination of the first DBP feature value and the second DBP feature value, and a combination of the first SBP feature value and the second SBP feature value; and
a display configured to output the estimated blood pressure.
|
|
7. A method of estimating blood pressure, the method comprising:
obtaining a pulse wave signal of a green wavelength and obtaining a pulse wave signal of an infrared wavelength from an object, by a first sensor when the object is in contact with the first sensor;
measuring an external force applied to a second sensor while the pulse wave signal of the green wavelength and the pulse wave signal of the infrared wavelength are measured by the first sensor;
obtaining a direct current (DC) component of the pulse wave signal of the green wavelength as a green PPG DC signal;
identifying a change in the green PPG DC signal as the external force increases over time; and
obtaining a first oscillometric envelope representing a blood amount in a blood vessel per unit force by dividing the green PPG DC signal by the external force;
obtaining a second oscillometric envelope based on the pulse wave signal of the infrared wavelength and the external force measured by the second sensor;
obtaining a first mean arterial pressure (MAP) feature value, a first diastolic blood pressure (DBP) feature value, and a first systolic blood pressure (SBP) feature value based on a peak value of the first oscillometric envelope;
obtaining a second MAP feature value, a second DBP feature value, and a second SBP feature value based on a peak value of the second oscillometric envelope; and
estimating the blood pressure based on a combination of the first MAP feature value and the second MAP feature value, a combination of the first DBP feature value and the second DBP feature value, and a combination of the first SBP feature value and the second SBP feature value.
|