How does the Pin Index Safety System (PISS) function?

• A. By regulating gas at the cylinder outlet
• B. By utilizing holes in the cylinder valve that fit two pins in the yoke
• C. By connecting the gas to the anesthetic machine
• D. By preventing gas leaks in the system

Answer: (B)

The Pin Index Safety System (PISS) is designed to prevent the incorrect connection of gas cylinders to an anesthetic machine by using a specific configuration of pins and holes. In this system, the cylinder valve has two pins that correspond to specific holes in the yoke of the anesthesia machine. Each type of gas has a unique pin configuration, ensuring that only the appropriate gas cylinder can be attached to the correct port of the anesthesia machine. This system enhances patient safety by minimizing the risk of introducing the wrong type of gas, which could have detrimental effects during anesthesia.

Other options, such as regulating gas at the cylinder outlet or preventing gas leaks, do contribute to overall safety and functionality, but they are not specifically what defines the PISS. Connecting the gas to the anesthetic machine is a part of the process but does not describe how PISS functions.