| 摘要 |
PROBLEM TO BE SOLVED: To provide an expiration backward flow preventing device in which contamination is prevented in an inhaler and a corrugated tube and the times of sterilization whenever the inhaler and the corrugated tube are used are reduced by preventing expiration from flowing backward to the inhaler. SOLUTION: The expiration backward flow preventing device with two valves is arranged between the corrugated tube from the inhaler and a mouthpiece. Then expiration is discharged to outer air without flowing backward to the inhaler after inhaling a chemical.
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