Dependability: a challenge for electrical medical implants.

Area of Science:

• Biomedical Engineering
• Medical Device Safety
• Systems Engineering

Background:

• Functional Electrical Stimulation (FES) offers a promising approach to restore physiological functions.
• Increasing complexity of FES systems and interdisciplinary development challenges patient safety.
• Existing dependability techniques from other industries are not directly applicable to FES medical implants.

Purpose of the Study:

• To propose a system-level risk management strategy for FES medical implants.
• To develop a uniform framework for hazard identification and consequence minimization.
• To perform an extended risk analysis on critical FES system components, particularly analog micro-circuits.

Main Methods:

• A system-level risk management strategy is proposed.
• A concurrent top-down and bottom-up approach is utilized for analysis.
• Focus is placed on the analog micro-circuit closest to human tissue.

Main Results:

• A uniform framework for hazard identification and mitigation in FES systems is presented.
• Critical elements within the FES system, especially analog micro-circuits, are identified.
• An extended risk analysis methodology is applied to these critical components.

Conclusions:

• The proposed strategy enhances safety for FES medical implants.
• The concurrent analysis method effectively highlights critical components and their associated risks.
• This approach is crucial for ensuring the reliability and dependability of FES systems for patient well-being.