Aestiva ventilation mode selector switch failures.

Area of Science:

• Anesthesiology
• Biomedical Engineering
• Medical Device Safety

Background:

• The Aestiva/5 anesthesia machine is a widely used device in clinical settings.
• The Bag-Ventilator Switch is a critical component for transitioning between manual and mechanical ventilation.
• Equipment malfunctions can have serious consequences for patient safety during anesthesia.

Observation:

• Three instances of Bag-Ventilator Switch failure in Aestiva/5 machines were documented.
• Each failure resulted in a significant breathing-circuit leak.
• The failures were attributed to a cracked toggle actuator, residue accumulation, and a cracked selector switch housing.

Findings:

• Cracked toggle actuators and selector switch housings are identified failure points.
• Residue build-up can also contribute to the malfunction of the Bag-Ventilator Switch.
• These failures can lead to sudden and large breathing-circuit leaks during anesthesia.

Implications:

• Clinicians should consider switch component failure when encountering unexplained breathing circuit leaks.
• Advancing the mode selector switch to its mechanical limit may be a temporary measure.
• The findings underscore the critical importance of maintaining readily available backup ventilation equipment.