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This cup has been designed to meet the demand for an instrument for washing out the nasal cavity, which could be used without fear of injury to the breathing passages, or forcing of fluid into the Eustachian tubes. It admits of the natural method of cleansing the nose. The fluid is placed in the cup, the higher curve of the rim being adjusted beneath the nostrils. The cup is tilted until the liquid enters the nostrils, then, closing the mouth, a slight drawing in of the breath causes the solution to enter the nose and naso-pharynx, thus bringing it in contact with all parts of the nasal mucous membrane. The solution may be allowed to pass to the back of the throat, and be expelled through the mouth. If it is desired to douche one nostril at a time, this may be easily accomplished by alternately pressing the elevated rim
EVANS WJ. NASAL DOUCHE CUP.. JAMA. 1901;XXXVII(8):527. doi:10.1001/jama.1901.62470340034023
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