Motion Assisting Device Asymmetry Correction
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Solution Overview
Problem
Current rehabilitation training methods struggle to replicate the motion patterns of a healthy individual, as they are dependent on the subject's capabilities, making it difficult to correct unbalances between human limbs.
Innovation Solution
A motion assisting device with orthoses and actuators symmetrically mounted on limbs, which detects posture variable variations and evaluates asymmetry to adjust assisting forces, allowing for rehabilitation of motor functions by controlling the actuator to balance limb motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rehabilitation training is conducted based on subject's capabilities, then training can be adapted to individual needs, but it becomes difficult to replicate healthy motion patterns and correct limb unbalances
Solution Approach 1:
The system captures motion data from a healthy person and uses it as a reference template. The actuator then copies this healthy motion pattern by applying assisting forces to guide the subject's limb through the correct motion trajectory, enabling replication of healthy patterns regardless of the subject's current capabilities
Solution Approach 2:
The system continuously detects the subject's actual motion state and compares it with the target healthy motion pattern. Based on the detected asymmetry and deviation from the reference pattern, the actuator dynamically adjusts the assisting force to guide the subject toward correct motion, enabling real-time correction of limb unbalances
2Stability of the object's composition
If symmetric orthoses are used on both limbs, then structural balance is achieved, but asymmetry in motion patterns between limbs cannot be effectively corrected
Solution Approach 1:
Although the orthoses structure is symmetric, the control system introduces asymmetric assisting forces based on the detected motion asymmetry. The actuator applies different magnitude and timing of forces to each limb to compensate for the detected motion pattern differences, effectively correcting asymmetry through asymmetric control of symmetric hardware
Solution Approach 2:
The system applies localized assisting forces at specific positions and timings during the gait cycle based on where asymmetry is detected. Rather than uniform treatment of both limbs, the actuator provides targeted force application to specific limbs at specific phases of motion to correct local motion deficiencies
Data Source
AI summary
A motion assisting device or the like, wherein the asymmetry degree of the motion patterns of human limbs is evaluated according to the variation patterns of the values of a pair of posture variables which vary with the postures in the respective same locations of the limbs. Furthermore, the evaluation result of the degree of the asymmetry can be utilized as the foundation of the motion control of the actuator of the motion assisting device. As a result, the motion of the human limbs can be assisted by the motion assisting device in such a manner that the balance of the motion patterns of the limbs is adjusted.