Accelerometer-Based Aspiration Detection System
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Solution Overview
Problem
Current methods for detecting aspiration, such as modified barium swallow and fibreoptic endoscopy, are invasive, costly, and not well-suited for bedside or non-institutional settings, particularly for individuals with silent aspiration, which poses significant health risks.
Innovation Solution
A system and method using an accelerometer to detect swallowing activity by extracting features like stationarity, normality, and dispersion ratio from electronic signals, with classification performed using a radial basis neural network to differentiate between normal and dysphagic swallows, and aspiration events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If modified barium swallow using videofluoroscopy is used to detect aspiration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical and radiological system of videofluoroscopy with a simple accelerometer-based mechanical sensing system. The accelerometer detects vibrations and movements in the throat area, and signal processing algorithms classify these signals to identify aspiration events, eliminating the need for X-ray equipment and barium contrast material.
Solution Approach 2:
The patent creates a functional copy of the videofluoroscopy aspiration detection capability using a different, simpler physical principle. Instead of using ionizing radiation and complex imaging, the system uses accelerometer signals that correlate with swallowing and aspiration mechanics, providing equivalent diagnostic information through a portable, low-cost device.
2Measurement precision
If modified barium swallow using videofluoroscopy is used to detect aspiration, then measurement precision is improved, but loss of time and cost increase
Solution Approach 1:
The patent replaces the time-consuming videofluoroscopy procedure with immediate accelerometer-based detection. The device provides real-time or near-real-time aspiration detection during feeding, eliminating the need for separate scheduling and execution of formal videofluoroscopy studies.
Solution Approach 2:
The patent enables continuous aspiration monitoring during actual feeding activities, rather than requiring intermittent formal assessment procedures. The accelerometer device can continuously track swallowing patterns and aspiration events throughout the feeding process, providing ongoing protection without interrupting the feeding routine.
3Measurement precision
If fibreoptic endoscopy is used to detect aspiration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces the invasive fibreoptic endoscope with a non-invasive accelerometer sensor. The accelerometer can be placed externally on the throat without requiring nasal insertion or professional endoscopic equipment, making it suitable for use by family members or caregivers in home settings.
Solution Approach 2:
The patent enables the device to be easily operated by non-experts in home environments. The accelerometer system requires minimal training to use, unlike fibreoptic endoscopy which requires specialized medical expertise, allowing families to monitor their loved ones independently without requiring hospital-based services.
4Ease of operation
If cervical auscultation is used to detect aspiration, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces manual cervical auscultation with an electronic accelerometer-based detection system. The accelerometer objectively measures throat vibrations and movements, replacing the subjective auditory assessment performed by clinicians, thereby improving measurement precision while maintaining ease of use.
Solution Approach 2:
The patent incorporates signal processing and classification algorithms that provide objective feedback on aspiration detection. The system analyzes accelerometer signals using trained classifiers to distinguish aspiration from normal swallowing, providing more reliable and consistent results than manual auscultation while maintaining simplicity of operation.
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
This approach provides a non-invasive, portable, and cost-effective method for detecting aspiration, improving accuracy and accessibility for bedside use, reducing the risk of health complications associated with undetected aspiration.
Implementation Method 1
A system and method using an accelerometer to detect swallowing activity
Data Source
AI summary
A system and method for detecting swallowing activity is provided. In an embodiment, a method includes receiving an electronic signal from an acceleronic signal from an accelerometer that represents swallowing activity, extracting at least two features from the signal, classifying the signal as a type of swallowing activity based on the extracted features, and generating an output of the classification. Exemplary activities include swallows, aspirations, movement and vocal artifacts. By indicating whether an activity is a swallow or an aspiration, the manner in which a patient afflicted with an increased likelihood for aspirations is fed can be adjusted to increase the likelihood of achieving a swallow instead of an aspiration during feeding. In turn this could reduce hospitalizations for aspiration pneumonia in patients with acute or chronic injury.