Wearable Accelerometer Power Measurement for Fall Risk
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Solution Overview
Problem
Conventional methods for measuring power during vertical movements, such as the Sit-to-Stand transfer, are cumbersome, require clinical settings, and provide only snapshot assessments, making them impractical for frequent and accurate monitoring of fall risk in elderly individuals.
Innovation Solution
A wearable sensor unit equipped with an accelerometer and a processor that estimates power used during vertical movements by calculating vertical accelerations and integrating them to determine ground reaction force and power, allowing for continuous, unobtrusive monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clinical measurement systems (force plate and optical marker system) are used to measure power during sit-to-stand transfer, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts the essential measurement function from the complex clinical system by using only an accelerometer attached to the user's body. This single sensor captures the necessary vertical acceleration data to calculate power, eliminating the need for force plates and optical marker systems while maintaining measurement capability.
Solution Approach 2:
The patent creates a simplified copy of the clinical measurement approach by using wearable sensors that replicate the measurement function. Instead of requiring the user to be in a clinical setting with complex equipment, a portable accelerometer-based system captures the same essential information about vertical movement and power generation.
2Measurement precision
If clinical measurement systems are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The accelerometer-based system allows the user to perform self-measurement without requiring clinical staff or complex setup procedures. The user simply attaches the accelerometer and performs the sit-to-stand transfer naturally, with the device automatically capturing and processing the data to provide power measurement.
Solution Approach 2:
The patent removes the operational complexity associated with clinical systems by extracting only the essential measurement function. The simplified accelerometer-based approach eliminates the need for multiple optical markers, force plates, and specialized clinical equipment, making the system easy for users to operate independently.
3Measurement precision
If clinical measurement systems are used, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The accelerometer is pre-attached to the user's body before the measurement task, eliminating the time-consuming setup procedures of clinical systems. The device is ready to capture data immediately when the user performs the sit-to-stand transfer, without requiring prior calibration or positioning of multiple sensors.
Solution Approach 2:
The patent extracts the measurement function from the time-consuming clinical protocol by using a single accelerometer that captures all necessary data during natural movement. This eliminates the need for multiple optical markers, force plate calibration, and complex synchronization procedures that consume significant time in clinical settings.
4Measurement precision
If clinical measurement systems are used, then measurement precision is improved, but adaptability deteriorates
Solution Approach 1:
The accelerometer-based system is universally applicable in multiple settings including home, community, and clinical environments. The same device can be used for various measurement purposes and by different user groups, providing consistent power measurement data across diverse contexts without requiring location-specific equipment.
Solution Approach 2:
The patent creates a portable copy of the clinical measurement capability that can be deployed anywhere. The accelerometer-based system replicates the essential measurement function in a format that adapts to different environments, eliminating the constraint of requiring a specialized clinical facility for accurate power measurement.
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 accurate and continuous assessment of power used during vertical movements, providing a reliable measure of balance quality and fall risk without the need for clinical settings, facilitating effective fall prevention programs.
Implementation Method 1
an accelerometer for attachment to a user and for measuring the acceleration experienced by the user
Implementation Method 2
estimate the vertical accelerations from the received measurements
Implementation Method 3
estimate the power used from the vertical accelerations
Data Source
AI summary
The power used by a user in performing the vertical component of a movement is estimated. An accelerometer attached to a user measures the acceleration experienced by the user during movement. A processor configured to receive the measurements of the acceleration from the accelerometer, be attached to the user, estimate the vertical accelerations from the received acceleration measurements, and estimate the power used from the vertical accelerations.