US 2023/0414115 A1Published application

Dual-altitude-based non-invasive blood pressure monitoring

AssigneeShenzhen Goodix Technology Co., Ltd.

InventorsYi HE, Bo PI

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Abstract

Techniques are described for non-invasive, dual-altitude-based measurement of blood pressure of a user using a portable electronic device having a sensor head. Illumination is projected into a body part and received by photodetectors. A changing amount of illumination received by the photodetectors changes corresponds to a changing amount of blood volume in elastic circulatory system pathways in the body part. Measurements of the received illumination are obtained at multiple altitudes relative to the user's heart. A linear fit is applied to the multiple measurements based on at least a predetermined slope-calibration factor to obtain a slope-corrected mean blood pressure measurement (BPM). Some embodiments use similar techniques to further measure pulse-to-mean (PTM) at multiple altitudes. The PTM measurements are used to simulate a systolic and/or diastolic BPM.

Claims20

Dependent claims

A system for non-invasive measurement of blood pressure of a user, the system comprising:

a sensor head comprising:
an illumination subsystem to project illumination through a body part that includes at least one elastic blood circulatory pathway through which flows a continuously changing volume of blood;
and
an optical detection subsystem to generate a detection output signal based on detecting changing amounts of received portions of the illumination passing through the body part corresponding to the continuously changing volume of blood;
and
a control processor to generate a blood pressure measurement (BPM) output by:
in a first measurement time window with the body part held positioned at a first altitude relative to the user's heart, directing the illumination subsystem to project the illumination through the body part, directing the optical detection subsystem to generate the detection output signal, and computing a first mean intensity of the detection output signal over the first measurement time window;
in a second measurement time window with the body part held positioned at a second altitude relative to the user's heart, directing the illumination subsystem to project the illumination through the body part, directing the optical detection subsystem to generate the detection output signal, and computing a second mean intensity of the detection output signal over the second measurement time window;
and
computing the BPM output to indicate a slope-calibrated mean BPM as a function of the first mean intensity, the second mean intensity, and a slope-calibration factor.

7 more elements

A method for non-invasive measurement of blood pressure of a user using a portable measurement system having a sensor head located on a body part of the user, the method comprising:

in a first measurement time window with the body part held positioned at a first altitude relative to the user's heart:
directing the sensor head to project first illumination into the body part, the body part including at least one elastic blood circulatory pathway through which flows a continuously changing volume of blood;
directing the sensor head to generate a first detection output signal based on detecting changing amounts of received portions of the first illumination passing through the body part corresponding to the continuously changing volume of blood;
and
computing a first mean intensity of the first detection output signal over the first measurement time window;
in a second measurement time window with the body part held positioned at a second altitude relative to the user's heart:
directing the sensor head to project second illumination into the body part;
directing the sensor head to generate a second detection output signal based on detecting changing amounts of received portions of the second illumination passing through the body part corresponding to the continuously changing volume of blood;
and
computing a second mean intensity of the second detection output signal over the first measurement time window;
and
computing a slope-calibrated mean blood pressure measurement (BPM) as a function of the first mean intensity, the second mean intensity, and a slope-calibration factor.

9 more elements

Dependencies are inferred from the claim text.