Fingertip Heart Rate Monitor with Optical Sensor and Pressure Feedback
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Solution Overview
Problem
Current fitness trackers provide complex and confusing interfaces for users to view activity data, often requiring wired connectors for syncing, and lack efficient methods to measure heart rate accurately during physical activity.
Innovation Solution
An activity tracking device with a motion sensor, processor, display screen, light source, and light detector that captures reflected light from a user's skin to calculate heart rate, integrated with features like pressure detection and feedback signals to optimize measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light source and light detector are integrated into the activity tracking device to measure heart rate, then heart rate measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent integrates the light source and light detector into the activity tracking device housing, combining multiple functions (motion tracking, heart rate monitoring) into a single device. This merging approach improves versatility while managing complexity through unified design.
Solution Approach 2:
The activity tracking device is designed to perform multiple functions including motion sensing, heart rate measurement, and data synchronization. The light source and detector enable heart rate monitoring in addition to existing activity tracking capabilities, making the device universal and adaptable to various health monitoring needs.
2Measurement precision
If motion sensors and multiple sensors are integrated to track activity and heart rate simultaneously, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The device separates different sensing functions into distinct components (motion sensor, light source, light detector, pressure sensor) that can be independently optimized and positioned within the housing. This segmentation allows each sensor to specialize in its measurement function, improving overall precision while organizing complexity.
Solution Approach 2:
The patent positions the light source and light detector at specific locations on the housing to optimize heart rate measurement at the fingertip. The sensors are strategically placed to maximize measurement quality while minimizing interference between different sensing functions.
3Reliability
If wired connectors are used for syncing data between tracker and client device, then data transfer reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces mechanical wired connectors with wireless communication technology for data synchronization between the activity tracking device and client devices. This substitution eliminates the need for physical connections, significantly improving ease of operation while maintaining data transfer reliability through established wireless protocols.
4Measurement precision
If pressure detection is added to optimize heart rate measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The pressure sensor provides feedback information about the force applied by the user's finger on the device. This feedback is used to optimize heart rate measurement by detecting proper contact pressure and potentially adjusting measurement parameters or providing user guidance to achieve accurate readings.
Solution Approach 2:
The pressure detection system enables the device to self-adjust or self-optimize the heart rate measurement process by monitoring contact pressure and determining when proper measurement conditions are met, reducing the need for manual user configuration.
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
Enables users to accurately monitor both activity and heart rate with a user-friendly interface, providing real-time feedback and improving data accuracy during rigorous activities by filtering out false heart beat detections.
Implementation Method 1
a light detector is integrated within the housing. The light detector configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel under a skin of a user
Data Source
AI summary
A system and method of tracking activity includes a motion sensor, a light source and a light detector. The light detector is configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel disposed under a skin of a user when the user places the skin over the heart rate monitor location on the housing. A processor is in communication with the motion sensor and the light detector and can process the reflected light to identify heart beats of the user and produce an indication of a heart rate. The indication of the heart rate can be displayed on the display screen as an option, in addition to the metrics that quantify the motion data.