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liter - Equals 1,000 milliliters or 1,000 cubic centimeters.
L/min - Liters per minute (e.g. total gas flow during one minute).
TM
Litholyme
- Material which retains exhaled carbon dioxide (used in absorber canisters). Product of
Allied Healthcare Products, Incorporated.
milliliter (ml) - 1/1000 of a liter, also equal to cc (cubic centimeter).
mmHg - Millimeters of mercury - A unit of measure for pressure.7
N
O - Nitrous oxide
2
O
- Oxygen
2
O-ring - An "O" shaped device that creates a seal between two adjoining surfaces
pop-off valve - An adjustable pressure relief valve that releases excess gas to the scavenger system. Also
known as an adjustable pressure limiter (APL) valve.
pressure gauge - A device used to measure pressure. Pressure gauges used for measuring medical gas
supplies are calibrated in psi. Pressure gauges used to measure pressures in the breathing system are
calibrated in cmH
O.
2
pressure regulator - A device used to reduce the pressure of a gas to the required safe working pressure.
psi - (pounds per square inch) - A unit of measure used to measure the pressure of medical gas supply
systems such as cylinders or central piping systems.
respiration - The process of gas exchange within the body.
respiratory cycle - The time interval from the beginning of inspiration to the beginning of the next
inspiration.
respiratory rate - The number of inspiratory/expiratory cycles per minute.
scavenger system - A system that safely removes waste gases from the breathing system. Flexible hoses
with 19 mm inner diameter connections must be used for scavenger systems. Also known as a waste gas
elimination system (WGES).
unidirectional valve - A valve in the patient's breathing circuit which opens only in one direction to gas
flow and remains closed to gas flow in the opposite direction.
ventilation - The movement of gas in and out of the lungs.
ventilator - A device that provides mechanical assisted or controlled ventilation.
wye connector - A 'Y' shaped connector which connects the two corrugated 22 mm hoses of the patient
breathing circuit to the 15 mm tapered endotracheal adapter.
yoke - A device to mount E-size medical gas cylinders (or smaller) to certain medical gas supply systems.
9-4
Useful Information
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