Pin Index Safety System

Pin Index Safety System

The Pin Index Safety System, or PISS, is a safety system that uses geometric features on the yoke to ensure that pneumatic connections between a gas cylinder and a machine that uses pressurized gases are not connected to the wrong gas yoke. This system can be seen on an anesthesia machine.

Each gas cylinder has a pin configuration to fit its respective gas yoke. Refer to the figure on the right; units are in millimeters.

*O2: 2-5
*N2O: 3-5
*Air: 1-5
*CO2: 1-6
*Heliox: 2-4

Standards

*International (ISO) and European (CEN) Standard:*EN ISO 407 : Small medical gas cylinders - Pin-index yoke-type valve connectionsPIN Index Entonox=7

References

*http://www.udmercy.edu/crna/agm/03.htm for pin positions.


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