What does the Pin Index Safety System stand for?

• A. Pin Index Safety System
• B. Pin Inlet Safety System
• C. Pin Isolation Safety System
• D. Pin Interlock Safety System

Answer: (A)

Pin Index Safety System is a safety feature on anesthesia machines that prevents attaching the wrong gas cylinder by using fixed index pins on the cylinder valve and matching receptacles on the machine. Each gas has a specific pin pattern, so only the correct cylinder can be connected, reducing the risk of delivering the wrong gas. In practice, this means the oxygen, nitrous oxide, and other gas lines have distinct pin configurations that must align with the machine’s sockets, providing a mechanical safeguard against misconnection. Other terms describe different safety mechanisms, but the essence here is the use of indexed pins to ensure proper gas-cylinder connections.