Compact Prosthetic Controller Integration
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Solution Overview
Problem
Conventional modular prosthetic limb controllers are too large and power-intensive, requiring external mounting and limiting flexibility and portability, while also not being able to fit within the prosthetic device due to size constraints.
Innovation Solution
A compact prosthetic controller system with a processing section and interface section, integrated within the prosthetic hand, utilizing a mobile processor and low-power FPGA for efficient power management and communication, along with a dorsal indicator and switch for patient feedback, allowing for flexible interfaces and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional control systems are used in modular prosthetic limbs, then the control functionality is sufficient, but the controller size becomes orders of magnitude larger than the limb itself and requires external mounting
Solution Approach 1:
The control system is segmented into modular functional blocks including a microcontroller unit, motor control module, sensor interface module, and wireless communication module. Each module can be independently designed, tested, and replaced, allowing the overall system to fit within the prosthetic limb while maintaining full control functionality.
Solution Approach 2:
The controller is designed with universal interfaces and protocols that can control multiple types of prosthetic components (motors, sensors, actuators) through standardized connection methods. This multi-functionality allows a single compact controller to replace what would traditionally require multiple separate control devices.
2Use of energy by moving object
If conventional control systems are used in modular prosthetic limbs, then the control capabilities are adequate, but the power consumption becomes substantial and limits portability
Solution Approach 1:
The controller implements periodic sleep-wake cycles where low-power modes are activated during idle periods and full functionality is restored only when control input is detected or scheduled tasks require execution. This periodic operation dramatically reduces average power consumption while maintaining responsive control capabilities when needed.
Solution Approach 2:
The system dynamically adjusts operational parameters such as processor clock speed, communication data rates, and sensor sampling frequencies based on current task requirements and available power levels. This allows the controller to optimize the balance between performance and power consumption in real-time.
3Volume of moving object
If the controller is made compact to fit within the prosthetic limb, then the portability improves, but the hardware and software footprints must be minimized
Solution Approach 1:
The controller architecture implements a nested structure where a core microcontroller is surrounded by specialized co-processor units and memory modules that can be selectively activated. This nested arrangement allows the system to maintain full functionality while minimizing the active hardware footprint at any given time.
Solution Approach 2:
Non-critical or rarely-used control functions are extracted from the main controller and implemented as separate firmware modules or even external software applications that can be loaded on-demand. This extraction reduces the permanent hardware footprint while maintaining access to comprehensive control capabilities when required.
Data Source
AI summary
A controller for a prosthetic device includes a processing section, an interface section connected to the processing section, and a power supply connected to both the processing section and the interface section. A dorsal indicator and a dorsal switch are disposed in a hand portion of the prosthetic device, and are both connected to the interface section.