Dual-Axis Accelerometry for Swallowing Impairment Detection
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Solution Overview
Problem
Current methods for detecting swallowing impairments, such as dysphagia, are invasive, expensive, or lack reliability, making it challenging to accurately and non-invasively identify swallowing abnormalities, especially in conditions like aspiration and penetration, which can lead to serious health risks.
Innovation Solution
A device and method using dual-axis accelerometry to acquire vibrational data along anterior-posterior and superior-inferior axes, processing this data through combinations, correlations, and trigonometric relations to classify swallowing events as normal or impaired, enabling the detection of potential aspiration or penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If videofluoroscopy is used to track swallowing activities, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical imaging system of videofluoroscopy with a simple accelerometer-based mechanical vibration detection system. The accelerometer measures cervical vibrations during swallowing, eliminating the need for expensive X-ray equipment while maintaining detection capability for swallowing abnormalities.
Solution Approach 2:
The patent uses inexpensive accelerometers that can be easily attached to patients' necks, replacing costly videofluoroscopy equipment. These simple, affordable sensors enable routine screening without requiring specialized facilities or expensive infrastructure.
2Measurement precision
If flexible endoscopic evaluation is used to assess swallowing, then measurement precision is improved, but device complexity and invasiveness increase
Solution Approach 1:
The patent substitutes invasive endoscopic visualization with non-invasive accelerometer-based vibration detection. By measuring mechanical vibrations on the cervical surface, the system avoids the need for internal endoscopic inspection, eliminating procedural invasiveness while maintaining diagnostic accuracy.
Solution Approach 2:
The patent introduces cervical vibrations as an intermediary signal that indirectly reflects swallowing status. Instead of directly observing the swallowing tract via endoscopy, the system detects vibrations caused by swallowing movements on the external cervical surface, providing a non-invasive proxy measurement.
3Ease of operation
If cervical auscultation is used to detect swallowing sounds, then ease of operation is improved, but reliability deteriorates
Solution Approach 1:
The patent replaces acoustic detection with mechanical vibration detection using accelerometers. Instead of listening for swallowing sounds, the system measures mechanical vibrations on the cervical surface, providing more reliable objective data while maintaining ease of operation through simple sensor attachment and automated analysis.
Solution Approach 2:
The patent employs automated signal processing algorithms that objectively analyze vibration patterns without requiring skilled clinician judgment. The system performs self-contained analysis of swallowing events, eliminating the subjectivity and inter-observer variability inherent in manual auscultation assessments.
4Ease of operation
If perceptual clinical screening is used to assess dysphagia, then ease of operation is improved, but reliability deteriorates due to subjectivity
Solution Approach 1:
The patent replaces subjective perceptual assessment with objective mechanical vibration measurement. By using accelerometers to quantify cervical vibrations during swallowing, the system transforms qualitative clinical judgment into quantitative, objective data that can be reliably measured and compared without observer subjectivity.
Solution Approach 2:
The patent employs automated algorithms that objectively analyze vibration patterns, eliminating the need for human assessor judgment. The system performs independent, reproducible analysis of swallowing events, ensuring consistent results across different patients and assessors while maintaining ease of operation through automated processing.
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
Provides a reliable, non-invasive, and cost-effective means to classify swallowing events, helping to identify impaired swallowing and guide adjustments in feeding to prevent aspiration and related health issues.
Implementation Method 1
dual axis accelerometry to acquire vibrational data along anterior-posterior and superior-inferior axes
Data Source
AI summary
A method classifies vibrational data acquired for a swallowing event to identify a possible swallowing impairment in a candidate. The method includes receiving axis-specific vibrational data for an anterior-posterior (A-P) axis and a superior-inferior (S-I) axis and representative of the swallowing event, for example from a sensor operatively coupled to a processing module that is a local or remote computing device. A portion of the axis-specific vibrational data for the A-P axis can be combined with a portion of the axis-specific vibrational data for the S-I axis on the processing module using one or more of linear combination, squared (power) sum, moving window correlation of the two signals, local minimum or local maximum of the two signals, and trigonometric relation. The method can include outputting from the processing module a classification of the swallowing event based on the combined vibrational data.