[Leakage from the connecting portion between the anesthesia machine and vaporizer].

Area of Science:

• Anesthesiology
• Medical Device Engineering

Background:

• The Fabius Tiro anesthesia machine by Drager utilizes a sevoflurane vaporizer.
• Secure connections are critical for accurate anesthetic gas delivery and patient safety.

Observation:

• Three instances of leakage were observed at the connecting portion of the sevoflurane vaporizer.
• Leakage occurred specifically at the interface with the monitor fixture.
• One case resulted in a decrease in patient oxygen saturation.

Findings:

• The vaporizer's connecting portion is susceptible to displacement by external forces due to its design.
• The system's ability to compensate for fresh gas under-supply by drawing in air masks the leakage.
• This makes early detection of sevoflurane vaporizer leakage challenging.

Implications:

• Potential for undetected anesthetic agent dilution and delivery errors.
• Risk of hypoxemia due to reduced oxygen saturation.
• Need for design modification of the vaporizer connection and integration of leakage detection alarms in anesthesia machines.