Anesthesia Equipment Maintenance

Study Notes

Oxygen Cylinder and Equipment Specifications

A fully filled steel oxygen cylinder contains 440 liters of medical oxygen.
It is critical to ensure the drain valve does not open at pressures below 10 embar.
The BG-4 breathing apparatus weighs 15 kg (33 lbs) when fully charged.
The maintenance of the BG-4's battery is crucial; it should be replaced every 6 months.
Avoid replacing batteries in potentially explosive environments.

Pressure Measurement and Flow Rates

Sentinel pressure measurement accuracy is ±2% of the final value.
The first low pressure warning triggers at approximately 700 psi, indicating about 75% oxygen used.
The last low pressure warning occurs at approximately 145 psi, with roughly 95% oxygen depleted.
Medium pressure in the BG-4 ranges between 58 psi and 64 psi.
The minimum valve provides flow rates greater than 80 L/min.

Testing Procedures and Guidelines

Conduct supply checks on the Sentinel every 15 minutes.
During the constant dosage test, the RZ-25 tester should indicate a flow of 1.5 to 1.9 LPM.
The breathing bag has a volume of 5.5 liters.
Proper testing involves adjusting the zero point on the RZ-25 tester before conducting tests.
Use a test adapter to connect the BG-4 apparatus to the RZ-25 tester.

Maintenance and Safety

Rubber components must be shielded from radiation and avoid exposure to solvents like acetone and alcohol.
Ensure belt and harness are dry before storage to prevent mold and fungus growth.
A failed self-check on the device is indicated by symbol X with an error code.

Alarm and Warning Systems

The yellow panic button initiates the main alarm on the Sentinel.
First low pressure alarm emits intermittent sounds for about 30 seconds with a flashing red LED.
The pressure relief valve operates between +20 and +50 millimeters (+2 embar to +5 embar) on the water gauge.

Component Care and Troubleshooting

Use Dow Corning 111 to lubricate O-rings.
To prevent leaks, check the inhalation and exhalation valves for defects.
The proper functioning of the exhalation valve should show -10 embar and +10 embar for inhalation cycles on the pressure gauge.
During a positive pressure leak test, ensure pressure drop is less than 1 embar within one minute.

Cartridge and Chemical Usage

Only DRAGERSORB 400 should fill the refillable cartridge, which remains good for 4 years from the manufacture date.
Factory-packed cartridges are also viable for the full four years.
A positive pressure within the breathing circuit is essential to stop ambient air infiltration.

Regulatory Compliance

The BG-4 system is approved for use with both factory and refillable cartridges.
Steel cylinders are considered full at 3135 psi when a + sign is marked post hydro test.

Description

This quiz covers the maintenance and testing of anesthesia equipment, including procedures for replacing batteries, lubricating O-rings, and adjusting pressure relief valves. It also reviews the use of specific devices and tools, such as the RZ-25 tester and BG-4 apparatus. Test your knowledge of anesthesia equipment maintenance and troubleshooting.