Patent ID: 6090049
Filing Date: 2000-07-18
Classification: A61B

Abstract:
In a screen-type spirometer comprising a pneumotachometer and a pressure transducer which are fluid-communicated with each other by means of a pair of flexible tubes, and comprising a flow indicating instrument which is connected to the pressure transducer by means of a conduit, said pneumotachometer including:tube integrally formed with said annularly shaped ring, said first respiratory tube capable of being inserted into a mouth of a person to be examined;O-shaped first and second sensing units for sensing pressure of respiratory gases passing through said pneumotachometer, said O-shaped first and second sensing units being disposed within said housing;a circularly shaped screen operating as a mechanical resistance against the respiratory gases and being disposed between said O-shaped first sensing unit and said O-shaped second sensing unit within said housing; anda second respiratory tube capable of being engaged with said housing and of being inserted into the mouth of the person to be examined,said spirometer further comprising a blowing apparatus for drying and dirt removal said screen in order to remove humidity and dirts formed on said screen after using said pneumotachometer, said blowing apparatus being provided as an individual unit apart from said pneumotachometer, said pressure transducer and said flow indicating instrument, which are associated with one another.