Which component connects the gas cylinder to the anesthesia machine?

• A. Pin Index Safety System
• B. Diameter Index Safety System
• C. Anesthesia System Display
• D. Auxiliary O2 Flow Control

Answer: (A)

The essential idea is preventing the wrong gas from being connected to the anesthesia machine by a dedicated mechanical safety fit. The component that links the gas cylinder to the machine is the Pin Index Safety System built into the yoke. The cylinder valve stem has a specific pattern of pins, and the yoke has matching holes; when the correct cylinder is placed, the pins align with the holes and lock in. This arrangement ensures that, for example, an oxygen cylinder cannot be connected to a port designed for another gas.

Diameter Index Safety System is used for preventing mix-ups at hose or pipeline connections, not the cylinder-to-machine connection. The display is just an interface for readings, and the auxiliary O2 flow control is a control knob for adjusting flow, not the connection mechanism.