Firmware-Independent Reset Circuit for Implantable Stimulators
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Solution Overview
Problem
Existing implantable medical devices face challenges in resetting their firmware when they malfunction, as the reset process relies on correct firmware operation, which may not function correctly in error states, posing risks to the recipient.
Innovation Solution
A firmware independent reset mechanism is implemented using a dedicated hardware circuit to decode reset signals via a transcutaneous wireless communication link, disconnecting the internal power source from other circuitry without relying on firmware, ensuring a reliable and safe reset regardless of the device's operational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If firmware-based reset is used, then the reset process can be controlled through software, but the reset may fail when firmware is in error states
Solution Approach 1:
The reset function is segmented into two independent paths: a firmware-based reset for normal operation and a hardware-based reset for fail-safe operation. This segmentation allows each path to be optimized for its specific use case while maintaining overall system reliability.
Solution Approach 2:
A dedicated hardware circuit acts as an intermediary between the transcutaneous wireless communication link and the microprocessor reset function. This intermediary can directly reset the microprocessor without relying on firmware, providing a reliable reset mechanism even when firmware is malfunctioning.
2Adaptability or versatility
If firmware is used to control reset, then complex reset logic can be implemented, but the system becomes dependent on correct firmware operation
Solution Approach 1:
The hardware reset circuit is pre-configured with the ability to reset the microprocessor independently of firmware state. This preliminary preparation ensures that a reliable reset path is always available, even before firmware malfunction occurs.
Solution Approach 2:
The hardware circuit serves as a mediator that can bypass firmware entirely for reset operations. It receives commands through the wireless communication link and directly controls the microprocessor reset, providing system independence from potentially faulty firmware.
3Reliability
If a dedicated hardware reset circuit is added, then reset reliability is improved, but device complexity increases
Solution Approach 1:
The hardware reset circuit is designed to be multi-functional, serving both as a reliable reset mechanism and as part of the overall power management system. By integrating it with existing power management components, the additional complexity is minimized while maintaining high reliability.
Solution Approach 2:
The hardware reset circuit is designed to be self-contained and self-regulating, requiring minimal external control. It automatically detects reset conditions and executes the reset function, reducing the need for additional control logic and minimizing overall system complexity.
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 firmware independent reset provides a fail-safe mechanism that ensures the device can be safely reset even in malfunctioning states, enhancing safety by avoiding reliance on potentially faulty firmware and ensuring immediate recognition of failures.
Implementation Method 1
communication circuitry configured to wirelessly communicate, via a transcutaneous wireless communication link, with a device external to the recipient's body
Data Source
AI summary
An apparatus includes at least one housing configured to be implanted within a recipient's body. The apparatus further includes communication circuitry, control circuitry, stimulation circuitry, and reset circuitry within the at least one housing. The communication circuitry is configured to wirelessly communicate, via a transcutaneous wireless communication link, with a device external to the recipient's body. The control circuitry is configured to generate control signals in response to power and/or data signals received via the transcutaneous wireless communication link. The stimulation circuitry is configured to respond to the control signals by providing stimulation and/or at least one medicament to the recipient's body. The reset circuitry is configured to respond to reset signals received via the transcutaneous wireless communication link by resetting the control circuitry and/or the stimulation circuitry to a default operational state.