Wearable Pulse Sensor for Hydration Monitoring via Arterial Expansion
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Solution Overview
Problem
Existing methods for monitoring hydration levels lack accuracy and require additional equipment, such as blood pressure cuffs, and are not effective in estimating hydration states without invasive measurements.
Innovation Solution
A pulse monitor with a sensor disposed over an artery that detects periodic expansions to infer heart rate and blood volume, correlating these metrics to estimate hydration levels without the need for additional apparatus, using differential peripheral artery expansion and heart rate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional hydration monitoring methods are used, then measurement accuracy may be adequate, but additional equipment such as blood pressure cuffs is required and invasive measurements are needed
Solution Approach 1:
The pulse sensor is designed to perform multiple functions: measuring heart rate, detecting arterial expansion, and estimating hydration levels all through a single device. This eliminates the need for separate blood pressure cuffs or other specialized equipment while maintaining measurement capability through multi-parameter analysis from the pulse signal
Solution Approach 2:
The system uses the body's own pulse signal as the measurement source, requiring no external invasive equipment. The pulse sensor detects natural arterial expansions during systole and diastole, converting the body's inherent physiological signal into hydration information without requiring external intervention or specialized medical devices
2Measurement precision
If blood pressure cuffs or invasive apparatus are used, then hydration measurement accuracy improves, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The invention replaces mechanical blood pressure measurement systems with an optical or magnetic pulse detection system. The pulse sensor detects arterial expansions through non-mechanical means, eliminating the need for inflatable cuffs or invasive probes while maintaining the ability to measure hydration-relevant parameters through signal processing of the pulse waveform
Solution Approach 2:
The pulse sensor acts as an intermediary that indirectly measures hydration status through arterial expansion patterns rather than directly measuring blood pressure or composition. This intermediary approach allows hydration estimation through readily detectable pulse characteristics without requiring direct contact with blood or complex mechanical pressure systems
3Measurement precision
If differential peripheral artery expansion is measured, then hydration estimation accuracy improves, but device complexity increases
Solution Approach 1:
The pulse signal is segmented into distinct phases: systolic expansion (first peak), diastolic contraction (trough), and reflected wave (second peak). By analyzing the differential expansion between these segmented phases, the system extracts hydration information without requiring a complex single-measurement system, instead using temporal segmentation of the pulse waveform
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
The solution allows for accurate estimation of hydration levels and caloric output, providing alerts for optimal hydration through a wearable device, enhancing monitoring capabilities without the need for invasive measurements.
Implementation Method 1
a pulse sensor that simultaneously measures heart rate and systolic peak to diastolic hump arterial expansion ratio
Implementation Method 2
measuring differential expansion of the peripheral artery with a pulse sensor to generate a modulation signal
Implementation Method 3
the pulse sensor may measure apparent motion of far field magnetic field (e.g., earth's magnetic field) or otherwise sense accelerations corresponding to gross motor movements of a person
Implementation Method 4
the pulse sensor may include a skin impedance sensor
Data Source
AI summary
A pulse sensor is capable of measuring a pulse rate of a wearer at a peripheral artery. In an embodiment, the pulse sensor includes a magnet supported to move responsive to an arterial pulse and a magnetometer configured to detect changes in a magnetic field produced by the magnet. The magnet may include a plurality of ferromagnetic particles disposed in or on a flexible substrate configured to be held adjacent to human skin subject to arterial palpation and a magnetic sensor configured to sense movement of the ferromagnetic particles. A system and method may measure hydration includes using a pulse sensor to measure pulse rate and modulation. The wearer is prompted when the pulse rate and pulse modulation indicate a response to dehydration of the wearer.