Pin Index Safety

Excerpt

The pin index safety system (PISS) is a precise configuration of pins and holes that facilitate the connection between a specific medical gas cylinder and the delivery system of these gases. This system was devised to prevent the unintentional placement of a cylinder of the wrong medical gas onto the hanger yoke of the anesthesia machine that was designed for another gas. While this system provides an element of safety, it does not eliminate the possibility of administration of incorrect gas.