Wearable Ring AFib Detection Using Triggered PPG Sampling
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Solution Overview
Problem
Current methods for detecting atrial fibrillation (AFib) are inadequate due to the paroxysmal nature of the condition, requiring long-term monitoring and often relying on invasive devices, and existing wearable technologies fail to provide accurate and timely detection.
Innovation Solution
A wearable ring device equipped with infrared PPG sensors that utilizes detection algorithms to identify and differentiate normal sinus rhythm from AFib by performing PPG sampling when specific trigger conditions are met, enabling on-demand AFib spot-checks and classification of AFib states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive devices are used for AFib detection, then detection accuracy is improved, but user comfort and ease of use deteriorate
Solution Approach 1:
The patent replaces invasive mechanical/electrical monitoring systems with a non-invasive optical PPG-based wearable ring device. The ring uses optical sensors to detect heart rate variability through the skin, eliminating the need for invasive electrodes or implants while maintaining detection capability through continuous optical monitoring.
Solution Approach 2:
The wearable ring device performs self-powered continuous monitoring without requiring external equipment or user intervention. The device autonomously collects PPG data, processes heart rate variability, and detects AFib episodes independently, providing continuous monitoring that is both accurate and comfortable for users.
2Reliability
If long-term monitoring is implemented, then detection reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent implements continuous PPG sampling and heart rate variability monitoring that operates uninterrupted throughout the day and night. The wearable ring continuously collects physiological data without requiring device removal or reconfiguration, ensuring reliable AFib detection while maintaining simple device operation through persistent monitoring.
Solution Approach 2:
The wearable ring serves multiple functions including continuous PPG monitoring, heart rate variability analysis, AFib detection, and sleep stage classification. By consolidating these functions into a single device, the patent reduces overall system complexity while maintaining comprehensive monitoring capabilities and high detection reliability.
3Measurement precision
If continuous monitoring is performed, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic PPG sampling rather than truly continuous monitoring, where the device samples at optimized intervals based on detected sleep stages and risk factors. During sleep, the ring performs periodic measurements at strategically determined times to capture AFib episodes without requiring constant power consumption, balancing detection accuracy with energy efficiency.
Solution Approach 2:
The system dynamically adjusts monitoring parameters based on detected sleep stages and user characteristics. During deep sleep stages, the device reduces sampling frequency to conserve energy, while increasing monitoring intensity during wakeful periods or when AFib risk factors are detected. This adaptive parameter adjustment maintains detection accuracy while significantly reducing overall energy consumption.
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
Enhances AFib detection by providing users with a comprehensive view of their heart rhythm, enabling earlier detection and personalized guidance for lifestyle modifications to prevent AFib episodes, reducing the need for invasive procedures.
Implementation Method 1
A wearable ring device configured to obtain photoplethysmogram (PPG) data from a user's finger
Implementation Method 2
A wearable ring device equipped with infrared PPG sensors
Data Source
AI summary
Methods, systems, and devices for atrial fibrillation (AFib) detection are described. A method may include acquiring physiological data collected from a user via a wearable ring device, the physiological data including temperature data and motion data, and identifying that a measurement trigger condition for AFib has been satisfied based on the temperature data satisfying a temperature threshold and the motion data satisfying a motion threshold. The method may include sampling photoplethysmogram (PPG) data for the user via the wearable ring device based on identifying satisfaction of the measurement trigger condition, and classifying one or more AFib states based on the sampled PPG data. The method may further include causing a GUI of a user device to display an indication of the one or more AFib states.