Optical Heart Pulse Detection with Motion Artifact Rejection
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Solution Overview
Problem
Current heart pulse detection methods are complex and unreliable, particularly due to motion artifacts that cause measurement errors when using optical transmission coefficients, which are unstable during movement.
Innovation Solution
An apparatus with at least two optical detectors placed along the blood circulation system, measuring blood pulses at known locations to eliminate motion artifacts by determining the pulse delay and order, and using a processor to validate the detection based on expected time differences and order, thereby improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical transmission coefficients are used to detect heart pulses, then heart rate measurement is enabled, but motion artifacts cause measurement errors and reduce reliability
Solution Approach 1:
The patent divides the detection task into multiple independent measurements by using at least two detectors positioned at different locations along the blood circulation path. Each detector independently measures optical transmission coefficients, and the results are combined to distinguish true heart pulse signals from motion artifacts, thereby improving reliability while addressing motion interference.
2Reliability
If multiple detectors are used to eliminate motion artifacts, then detection reliability improves, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary processing step that analyzes the correlation between signals from multiple detectors. By examining whether detected variations occur simultaneously across detectors and match expected physiological patterns, the system can validate true heart pulse signals while rejecting motion artifacts, thus improving reliability without requiring complex hardware modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly enhances the reliability of heart pulse detection by accurately separating heart pulses from motion artifacts, ensuring accurate heart rate and cardiovascular activity assessment.
Implementation Method 1
detecting a blood pulse optically from the blood circulation of the person
Data Source
AI summary
An apparatus includes a strap configured to enable the apparatus to be worn by a user; an optical measurement element configured to be placed on a skin of the user, and to measure data related to heart activity of the user; communication circuitry configured to transmit the data related to heart activity of the user according to a Bluetooth standard on a 2.4 GHz band; and an antenna coupled with the communication circuitry, and configured to access a radio interface to transmit the data related to heart activity of the user.