Center of Pressure Control System for Adaptive Rehabilitation
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Solution Overview
Problem
Conventional rehabilitation devices lack the ability to assess compensatory movements during balance control training, leading to ineffective rehabilitation outcomes due to boredom, fatigue, and loss of concentration from repetitive tasks.
Innovation Solution
A center of pressure (CoP) based control system that includes sensors and an electronic device to measure force exerted by a subject, generate CoP data, determine the presence of anticipatory postural adjustments (APAs) or compensatory movements, and generate control signals based on CoP trajectory analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rehabilitation devices use repetitive body movements for balance control training, then the subject undergoes balance control training, but the subject becomes bored, fatigued and loses concentration
Solution Approach 1:
The system dynamically adjusts rehabilitation tasks based on real-time CoP trajectory analysis. The control system generates different task types (e.g., reaching tasks, stepping tasks) and adjusts task parameters (difficulty, duration, intensity) according to the subject's performance and fatigue level, making the rehabilitation process adaptive rather than static and repetitive
Solution Approach 2:
The system provides real-time feedback to the subject through visual displays showing CoP trajectory, balance performance metrics, and task completion status. This immediate feedback loop keeps the subject engaged by showing progress and allowing them to adjust their movements, transforming passive repetitive exercise into active controlled practice
2Reliability
If conventional rehabilitation devices do not assess compensatory movements, then the device structure remains simple, but the rehabilitation effect is adversely affected
Solution Approach 1:
The system replaces complex mechanical assessment devices with electronic sensing technology. Pressure-sensitive sensors embedded in the training platform electronically measure CoP position and trajectory, automatically detecting compensatory movements like leg swings and body tilts without requiring additional mechanical measurement apparatus
Solution Approach 2:
The control system acts as an intermediary that processes raw sensor data from the platform and translates it into meaningful assessment information. The system analyzes CoP trajectories to identify compensatory movements and provides interpreted feedback to both the subject and therapists, simplifying the overall system architecture while enabling comprehensive assessment
3Measurement precision
If the system continuously monitors CoP trajectory to detect APA and compensatory movements, then accurate assessment is achieved, but system complexity and processing requirements increase
Solution Approach 1:
The control system extracts only the critical features from continuous CoP trajectory data - specifically looking for characteristic patterns that indicate APA (anticipatory postural adjustments) and compensatory movements. Rather than processing every data point, the system identifies key events and patterns, reducing computational complexity while maintaining detection accuracy
Solution Approach 2:
The system changes the analysis parameters dynamically based on the training phase and task type. Different thresholds and detection criteria are applied depending on whether the subject is performing static balance tasks or dynamic movement tasks, optimizing the balance between detection sensitivity and processing requirements for different rehabilitation scenarios
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 effectively assesses and provides feedback on the appropriateness of body movements during rehabilitation, enhancing engagement and improving rehabilitation outcomes by differentiating between APA and compensatory movements, thus addressing the limitations of conventional devices.
Implementation Method 1
a plurality of sensors each of which is configured to make continuous measurement of force exerted thereon by a subject
Data Source
AI summary
A center of pressure (CoP) based control system includes a sensing device and an electronic device connected to the sensing device. The sensing device includes sensors each of which continuously measures force exerted thereon by a subject and generates a sense signal based on a result of the measurement. The electronic device is connected to the sensing device, and receives the sense signals from the respective sensors, generates CoP data associated with a CoP trajectory based on the sense signals, determines whether a turning point exists in the CoP trajectory, generates an indication signal based on a result of the determination, and generates a control signal based on a direction of one of displacements of the CoP.