Conductive Human Interface for Prosthetic Signal Transmission
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Solution Overview
Problem
Existing human interface technologies for transmitting electromyographic (EMG) signals and transcutaneous electrical nerve stimulation (TENS) face challenges in efficiently communicating low-voltage signals from the skin to processing devices, requiring additional electrical components for amplification and processing, which can complicate the integration with assistive devices like prosthetics.
Innovation Solution
A conductive human interface system featuring a fabric layer with embedded conductive thread or fabric, electrodes, and a processing board that can be easily inserted and removed, allowing for flexible and durable signal transmission directly from the skin to assistive devices, including prosthetic sockets, while also enabling TENS for pain management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional electrical components are used to amplify and process EMG signals, then the signals can be processed effectively, but the device complexity increases
Solution Approach 1:
The patent combines the electrode, signal processing electronics, and power source into a single integrated module that attaches directly to the prosthetic socket. This merging eliminates the need for separate amplification and processing components, reducing overall device complexity while maintaining reliable EMG signal processing capability through integrated circuitry designed specifically for this application.
Solution Approach 2:
The integrated module serves multiple functions simultaneously: it detects EMG signals from electrodes, amplifies and processes the signals, provides power through an embedded source, and interfaces with the prosthetic control system. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while ensuring reliable signal processing.
2Reliability
If traditional electrodes and leads are used to communicate EMG signals, then signal transmission is achieved, but the ease of operation and reusability is reduced
Solution Approach 1:
The system is segmented into a reusable integrated module that contains the electrodes, electronics, and power source, and a disposable or replaceable interface component that attaches to the prosthetic socket. This segmentation allows the main signal transmission components to be reused across different prosthetics or users, while only the interface portion needs to be replaced, significantly improving ease of operation and reusability.
Solution Approach 2:
The patent introduces an intermediary interface layer between the integrated module and the prosthetic socket control system. This intermediary contains the connection points and allows the integrated module to be easily attached and detached without complex wiring connections, enabling quick replacement and reuse of the module while maintaining reliable signal transmission.
3Stability of the object's composition
If the processing board is permanently integrated into the housing, then structural stability is improved, but the adaptability and reusability decreases
Solution Approach 1:
The housing is segmented into a stable structural shell that provides structural stability and protection, and a removable processing board that can be easily inserted and removed. The housing contains standardized slots and connection points that ensure the processing board is securely held during use, providing structural stability, while allowing quick replacement for different applications or repairs, thereby improving adaptability and reusability.
Solution Approach 2:
The system transitions from a static permanent integration to a dynamic configurable integration. The processing board is designed to be removable and replaceable, allowing the system to adapt to different processing requirements, users, or repair needs. This dynamic design maintains structural stability during operation while enabling flexibility and reusability across different 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
This solution enhances the control and functionality of assistive devices by directly transmitting EMG signals and providing TENS, improving user interaction and comfort with flexible and durable interfaces that can be reused, expanding the receptive field for EMG signal collection beyond traditional socket limits.
Implementation Method 1
A conductive path reaches from the electrode into the housing
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
An electrode is supported on a prosthetic liner to communicate electrically with a residual limb. A housing is fixed to the liner, and is receivable in a socket in an installed position. A processor is installed in the housing in communication with the electrode. Electrical signal contacts are exposed at a distal end of the housing for contacting electrical signal contacts in the socket. The housing defines a ground current path that communicates with a ground contact in the socket.