In-Ear Pressure Monitoring With Leak-Corrected Earbud Sealing
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Solution Overview
Problem
Existing wearable blood pressure monitoring systems, such as the Apple Watch 5 and other wrist-worn devices, require separate cuffs for measurement, are prone to inaccurate readings if not properly fitted, and lack automated calibration for continuous and accurate hemodynamic pressure monitoring.
Innovation Solution
A biosensor system using earbud-based acoustical assembly with in-ear acoustic sensors that detect acoustic signals, including infrasonic hemodynamic pressure signals, and a data analysis system that corrects for leaks by monitoring signal characteristics over time, applying filters to ensure accurate blood pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wearable blood pressure monitoring systems use separate cuffs for measurement, then measurement accuracy can be maintained, but device complexity and user convenience deteriorate
Solution Approach 1:
The patent combines the blood pressure monitoring function with the earbud device itself, integrating the acoustic sensor, speaker, and processing components into a single wearable unit. This eliminates the need for separate cuffs while maintaining measurement capability through in-ear acoustic monitoring of hemodynamic signals.
Solution Approach 2:
The earbud device performs multiple functions: it serves as both an audio device (with speaker for playing sounds) and a hemodynamic monitoring device (with acoustic sensor for detecting pressure signals). This multi-functionality reduces the need for separate specialized equipment while maintaining measurement accuracy.
2Ease of operation
If wearable blood pressure monitoring systems eliminate separate cuffs, then user convenience improves, but measurement accuracy deteriorates due to improper fitting and lack of calibration
Solution Approach 1:
The system performs preliminary calibration by playing calibration sounds through the speaker and recording the acoustic responses with the sensor before actual blood pressure measurements. This pre-calibration establishes baseline characteristics of the individual's ear canal and seal, enabling accurate subsequent measurements without requiring user intervention for fitting adjustments.
Solution Approach 2:
The system continuously monitors acoustic signals and uses feedback algorithms to detect seal quality and adjust measurements accordingly. By analyzing the acoustic responses in real-time, the system can identify improper sealing conditions and compensate or alert the user, maintaining accuracy despite variations in fit.
3Measurement precision
If the earbud seal is strong to prevent acoustic leaks, then measurement accuracy improves, but comfort and ease of insertion deteriorate
Solution Approach 1:
The system applies partial sealing pressure rather than requiring a complete tight seal. The acoustic sensor and signal processing algorithms are designed to work with a moderate seal that is sufficient for accurate measurement but not so tight as to cause discomfort. The calibration process determines the optimal seal level for each user.
4Measurement precision
If the system continuously monitors signal characteristics to detect leaks, then measurement accuracy improves, but energy consumption increases
Solution Approach 1:
The system performs leak detection and calibration monitoring at periodic intervals rather than continuously. Calibration sounds are played at scheduled times, and seal quality is assessed at these discrete moments. Between calibration events, the system uses the established baseline for measurements, reducing energy consumption while maintaining accuracy.
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 system provides continuous, accurate hemodynamic pressure monitoring by correcting for acoustic leaks, improving measurement accuracy and eliminating the need for separate cuffs, thus enhancing user convenience and reducing calibration errors.
Implementation Method 1
an earbud with an in-ear acoustic sensor that detects acoustic signals in the ear canal. The acoustic signals include audible signals and infrasonic signals
Implementation Method 2
The earbud seal creates an enclosed acoustic chamber within the ear canal that is bounded by walls of the ear canal and surfaces of the earbud
Data Source
AI summary
A system and method for leak correction and normalization of in-ear pressure measurement for hemodynamic monitoring are disclosed. The system includes an acoustical assembly and a data analysis system. The acoustical assembly includes an earbud system that forms an earbud seal with an ear canal of an individual, where the earbud system includes an earbud with an in-ear acoustic sensor that detects acoustic signals in the ear canal. The acoustic signals include audible signals and infrasonic signals. The data analysis system receives the acoustic signals from the earbud system, identifies hemodynamic pressure signals from a body of the individual included within the infrasonic signals, and identifies signal characteristics of the pressure signals over time. The data analysis system can then correct the hemodynamic pressure signals for effects caused by leaks in the earbud seal based upon changes to the signal characteristics over time.