A Trial Manufacture of Rhinomanometer with Percentage Expression

Research Project Number:63870068

Principal Investigator

  • FY1988~FY1990

    • 海野 徳二
    • UNNO, Tokuji
    • Researcher Number:80073732
    • 旭川医科大学・医学部・耳鼻咽喉科・教授


    • 平野 道之
    • 日本光電工業株式会社・生体計測事業部・技術部長
    • 内藤 義弘
    • NAITOH, Yoshihiro
    • Researcher Number:00125402
    • 旭川医科大学・医学部・耳鼻咽喉科・講師
    • 松木 英幹
    • リオン株式会社・聴能技術部・課長

    • 平野 道之
    • 日本光電工業株式会社・生体計測事業部・部長
    • HIRANO, Masamichi

Basic Information of this Research Project(Latest Year)

  • Project Year


  • Research Field


  • Screening Classification

  • Research Category


  • Research Institution


  • Budget Amount

    • Total:¥3400000
    • FY1988:¥2600000 (Direct:¥2600000)
    • FY1989:¥400000 (Direct:¥400000)
    • FY1990:¥400000 (Direct:¥400000)

Abstract(Latest Report)






The nasal resistance is a usual way to express patency of the nasal cavity in rhinomanometry. The relationship between flow and pressure is curvilinear, so the value of the resistance is different in a subject according to the reference point. Although the international and Japanese committees paid great endeavor to decide the only one reference point, the conclusion was not yet attained. The idea of percent expression of nasal patency began from the above mentioned problem. Pressure flow curves from many subjects do not cross each other except the origin. This means that aerodynamic characteristics in the nasal cavities are similar and that if a curve is expressed by a formula y=f (x), others are expressed by multiplying the formula by n.

In the first year, flow signals of a pressure flow curve were sampled at the same interval of 2.5 Pa along the x axis, and digitalized by A-D converter. Each flow value was divided by another one at the same pressure point using a personal computer. Thus, we could obtain many quotients. These quotients were very similar and mathematically averaged with a standard deviation. Calculations at the same pressure points meant comparison of resistance or conductance, in other words, comparison of the whole curve was accomplished. If one of the curves was standard, pathognomonic values were expressed as ratio or percentage. If one was preoperative, postoperative improvement was evaluated.

In the second year, we performed almost the same procedure by built-in microcomputer of an ordinary rhinomanometer. Satisfactory results were obtained.

In the third year, an additional data terminal was connected to the rhinomanometer. A 64 K Byte RAM card could memorize 16 curves and send them back to the rhinomanometer whenever necessary. Besides, these data were also sent to a personal computer to promote further analyses.

Percent expression of nasal patency is reasonable from the viewpoint of aerodynamic comparison of the nasal cavities, understandable by practitioners and accurate for clinical as well as experimental studies.

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