Prosthetic Hand Motion Control Using Dual Gyro Sensor Modules
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Solution Overview
Problem
Existing electronic prosthetic hands using electromyography sensors face issues with time delay in control, reduced reliability due to signal instability, and high manufacturing costs, making mass production difficult.
Innovation Solution
An electronic prosthetic hand utilizing gyro sensors and acceleration sensors positioned on the user's finger and back of the hand to detect joint movements, with a control unit that compares displacement values to ensure reliable operation and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromyography sensors are used to detect muscle signals for controlling prosthetic hand movements, then the prosthetic hand can respond to user muscle signals to implement natural movements, but there is a time delay in controlling the prosthetic hand and the signal strength weakens due to muscle fatigue
Solution Approach 1:
The patent replaces electromyography sensors that detect electrical muscle signals with gyro sensors and acceleration sensors that detect mechanical movement and orientation of the residual limb. This substitution eliminates the time delay and signal weakness issues associated with EMG sensors, as mechanical sensors provide immediate and consistent response regardless of muscle fatigue.
Solution Approach 2:
The patent introduces an intermediary mechanical coupling system between the user's residual limb and the prosthetic hand. The gyro sensor and acceleration sensor act as intermediaries that translate the mechanical movement of the residual limb into control signals for the prosthetic hand, providing a more reliable and responsive control mechanism than direct electrical signal detection.
2Adaptability or versatility
If electromyography sensors are used to detect muscle signals, then the prosthetic hand can perform various movements, but the electromyography signal becomes unstable depending on surrounding electromagnetic interference or skin condition
Solution Approach 1:
The patent substitutes electromyography sensors with mechanical sensors (gyro and acceleration sensors) that detect physical movement rather than electrical signals. This replacement eliminates susceptibility to electromagnetic interference and skin condition variations, providing stable and reliable signal detection while maintaining full movement capability.
3Adaptability or versatility
If electromyography sensors are used for each amputee, then the prosthetic hand can be customized to individual needs, but mass production is difficult and manufacturing cost increases
Solution Approach 1:
The patent employs a universal control system using gyro and acceleration sensors that can be standardized across all prosthetic hands. The sensor modules and control algorithms are designed to work with different amputation types and residual limb configurations without requiring customization, enabling mass production while maintaining adaptability to individual user needs through software configuration rather than hardware modification.
4Ease of operation
If electromyography sensors are used to detect muscle signals, then the prosthetic hand can implement joint movement using motors, but the responsiveness decreases as the signal strength weakens due to muscle fatigue
Solution Approach 1:
The patent replaces electromyography-based electrical signal detection with mechanical movement detection using gyro and acceleration sensors. This substitution ensures consistent response speed for joint movement control regardless of muscle fatigue, as mechanical sensors detect physical movement directly without relying on weakening electrical signals from tired muscles.
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 prosthetic hand achieves enhanced operational reliability and reduced manufacturing costs by accurately detecting hand movements and minimizing unintended joint movements, applicable to various amputation types.
Implementation Method 1
a gyro sensor provided in each of the first sensor module and the second sensor module
Implementation Method 2
the first sensor module and the second sensor module each further include an acceleration sensor that measures acceleration of the first sensor module and the second sensor module
Data Source
AI summary
Provided is an electronic prosthetic hand that detects and operates hand movements. The electronic prosthetic hand may include a prosthetic hand including a finger unit capable of joint movement and a control unit that controls the finger unit, a first sensor module positioned on a user's finger, a second sensor module positioned on the back of the user's hand, and a gyro sensor provided in each of the first and second sensor modules to measure displacement according to a change in the positions of the first and second sensor modules. The electronic prosthetic hand can be used more precisely because the first and second sensor modules detect the movements of the user's finger and back of the hand, respectively, and implement joint movements of the finger unit based on the displacement difference values according to the movements of the finger and back of the hand.