Spirometer, display and method
First Claim
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1. A spirometer comprising a housing,an exhale air tube in said housing, said exhale air tube including a first section and a contiguous second section, said first section having a converging channel in which flow velocity is increased thereby decreasing the static pressure and said second section having laminar flow air pressure drop, anda pressure transducer connected to measure the pressure drop across said first and second sections and providing an indication of the pressure drop.
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Abstract
A spirometer coupled to a manual resuscitator. An air tube in the spirometer has a converging section, a laminar flow section and a pressure recovery section. A microcontroller and a display of expiratory flow parameters is provided.
63 Citations
13 Claims
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1. A spirometer comprising a housing,
an exhale air tube in said housing, said exhale air tube including a first section and a contiguous second section, said first section having a converging channel in which flow velocity is increased thereby decreasing the static pressure and said second section having laminar flow air pressure drop, and a pressure transducer connected to measure the pressure drop across said first and second sections and providing an indication of the pressure drop.
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9. A resuscitator system comprising in combination:
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a manual resuscitator having a squeeze-bag, means for coupling respiratory gases from said squeeze-bag to a patient and receiving expiratory gas from said patient, an expiratory exhaust gas port coupled to said patient, and a spirometer comprising a housing, an exhale air tube in said housing, said exhale air tube including a first section and a contiguous second section, said first section having a converging channel in which flow velocity is increased thereby decreasing the static pressure and said second section having laminar flow air pressure drop, and a pressure transducer connected to measure the pressure drop across said first and second sections and providing an indication of the pressure drop coupled to said expiratory exhaust gas port, said spirometer including a microcontroller connected to said pressure transducer, a display device connected to said microcontroller for presenting to the user patient expiratory parameters including expiratory tidal volume, and expiratory minute volume and expiratory ventilatory frequency. - View Dependent Claims (10, 11, 12, 13)
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Specification