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venturi mask
The venturi mask, also known as an air-entrainment mask (and sometimes by the brand name Ventimask®), is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy. The mask was invented by Moran Campbell as a replacement for intermittent oxygen treatment, a practice he described as "bringing a drowning man to the surface- occasionally".
Venturi masks are considered high-flow oxygen therapy devices. This is because venturi masks are able to provide total inspiratory flow at a specified FiO2 to patients therapy. The kits usually include multiple jets in order to set the desired FiO2 which are usually color-coded.
Other brands of masks have a rotating attachment that controls the air entrainment window, affecting the concentration of oxygen. This system is often used with air-entrainment nebulizers to provide humidification and oxygen therapy.
== Mechanism ==
The mechanism of action is usually incorrectly quoted as depending on the venturi effect. Despite there being no evidence for this, many textbooks and journal articles cite this as the mechanism. However, a fixed performance oxygen delivery system, despite often being called a venturi mask works on the principle of jet mixing. 〔Kittredge P. Neither Venturi nor Bernoulli. Lancet. 1983;1(8317):182〕 〔Scacci R. Air entrainment masks: jet mixing is how they work; the Venturi and Bernoulli principles are how they don't.Respir Care. 1979;24:928–931.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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