Blood pressure estimation using near-infrared spectroscopy

EP4757703A1Pending Publication Date: 2026-06-17CARNEGIE MELLON UNIV
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
CARNEGIE MELLON UNIV
Filing Date
2024-08-07
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Current methods for non-invasive blood pressure measurement, such as oscillometric techniques, suffer from inaccuracies due to variations between subjects, disease conditions, and age groups, resulting in errors of 5-10 mmHg, which is approximately 5% of the measured value.

Method used

A computer-implemented method using near-infrared spectroscopy (NIRS) to determine blood pressure by transmitting light into a patient's limb distal to an occlusion point, measuring changes in light parameters during and after occlusion, and calculating systolic blood pressure based on these changes.

Benefits of technology

This method provides more accurate blood pressure measurements compared to standard oscillometric methods, with a reduced root-mean squared error (RMSE) of 4.08 mmHg, allowing for improved clinical applications and earlier intervention in patients with rising blood pressure.

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Abstract

Provided herein is a computer-implemented method of determining blood pressure in a patient, including steps of transmitting light into a patient's limb distal to an occlusion point, receiving, first data relating to a pressure applied to occlude a patient's limb, receiving second data relating to a parameter of the transmitted light at a first time point during occlusion of the patient's limb, receiving third data relating to the parameter of the transmitted light at a second time point after perfusion of the patient's limb has resumed, comparing the second data to the third data determine a characteristic of the transmitted light, and determining the patient's systolic blood pressure based at least on the first data and the characteristic of the transmitted light.
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