[Stricture of oxygen outlet of the central piping identified by a decrease in the oxygen supply pressure into the...

Area of Science:

• Biomedical Engineering
• Medical Device Safety

Context:

• Anesthesia delivery systems rely on consistent oxygen supply.
• Intermittent pressure drops in central piping oxygen outlets can go unnoticed during routine checks.
• Previous similar incidents indicate a recurring issue with O-ring degradation.

Purpose:

• To report an incident of oxygen supply pressure malfunction in an anesthesia machine.
• To highlight the importance of monitoring pressure deviations during high-flow oxygen use.
• To identify O-ring degradation as a cause of intermittent oxygen supply failure.

Summary:

• An O-ring degradation in the central piping oxygen outlet led to intermittent decreases in oxygen supply pressure to the anesthesia machine.
• The malfunction was initially missed due to periodic normal pressure readings.
• Cyclical pressure drops correlated with increased oxygen consumption, signaling a critical failure.

Impact:

• Emphasizes the need for vigilant monitoring of oxygen supply pressure, especially under high-flow conditions.
• Suggests that O-ring degradation is a potential cause of critical anesthesia equipment failure.
• Highlights the limitations of periodic checks in detecting dynamic pressure fluctuations.