Clinical Engineering Fundamentals
Clinical Engineering Fundamentals
Clinical engineering applies engineering, physiology, and management to the safe, effective lifecycle of medical technology. The exam tests lifecycle thinking, risk classification, systems and human-factors analysis, and the ability to connect device performance to clinical workflow.
Core rules
- A device moves through needs assessment, selection, acquisition, acceptance testing, maintenance, and decommissioning; decisions at each phase affect safety and cost.
- Risk = severity × probability; use it to set PM intervals, inventory criticality, and audit frequency.
- Separate hazard (source), risk (likelihood/impact), and failure (loss of function). FMEA and RCA answer different questions.
- Human factors and usability are engineering inputs, not "user error" labels.
Worked example
A hospital plans to replace 120 infusion pumps. Purchase price is $6,000 each; a five-year service contract is $900/pump/year; expected downtime costs $40/hour and the fleet averages 3 downtime hours/pump/year. Life-cycle cost per pump = $6,000 + 5×$900 + 5×3×$40 = $6,000 + $4,500 + $600 = $11,100. A lower-cost pump with a 6-hour downtime average adds $1,200/pump in downtime cost, changing the comparison.
Traps
- Equating lowest purchase price with lowest life-cycle cost.
- Copying OEM PM intervals without checking use profile and risk.
- Treating a use error as purely a training problem when design contributed.