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A Littmann stethoscope. David Littmann (July 28, 1906 – January 1, 1981) was an American cardiologist and Harvard Medical School professor and researcher. [1] The name Littmann is well known in the medical field for the patented Littmann Stethoscope reputed for its acoustic performances for auscultation.
[16] [17] Having ascertained via the autopsy that the plague was spreading by air, Wu developed surgical masks into more substantial masks with layers of gauze and cotton to filter the air. [ 18 ] [ 19 ] Gérald Mesny, a prominent French doctor who had come to replace Wu, refused to wear a mask and died days later of the plague.
A Pinard horn is a type of stethoscope used to listen to the heart rate of a fetus during pregnancy. It is a hollow horn, often made of wood or metal, about 200 millimetres (7.9 in) long. It functions similarly to an ear trumpet by amplifying sound. The user holds the wide end of the horn against the pregnant woman's abdomen, and listens ...
KN95 masks are more expensive than disposable or fabric masks. You can find a pack of 25 KN95 masks for $38 or a pack of 50 between $45 and $60 depending on the retailer. Similar to the N95, each ...
Training masks are facial masks worn to limit the intake of air during breathing. Their ostensible purpose is to strengthen the respiratory musculature by making it work harder. There is some evidence that they may improve endurance capacity ( VO 2 max ) and power output, but research into their benefits has so far generally proven inconclusive.
A dilutor demand regulator draws ambient air into the mask through an orifice in the regulator, while concurrently being fed with pure oxygen through a demand valve in the regulator. For aeronautical use the size of the ambient air orifice is controlled by an aneroid valve operator and is directly proportional to atmospheric pressure. [ 12 ]