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US 7,063,669 B2Granted
Portable electronic spirometer
AssigneeDynamic MT AG
InventorsDavid Brawner, Christopher Hegarty
Life of this patent
Estimating the term…
Abstract
A spirometer having a housing with an elongated flow chamber open at one end, a pressure sensing end opposite the open end and an outlet passageway intercepting the flow chamber at an angle α and proximate the pressure sensing end. A differential pressure sensor is coupled to the pressure sensing end from a port at an angle β to an axis of the flow chamber. The angle α is substantially greater than 0° but substantially less than 180° while the angle β may range from 90° to 180°, such that a significantly increased measured air pressure results over that measured when α=180° and β=90°.
Claims14
A spirometer, comprising:
- a. a housing having an elongated flow chamber at one end, a pressure sensing end opposite said one end, and an outlet passageway intercepting said flow chamber at an angle α;
- b. a differential pressure sensor coupled to said pressure sensing end of said flow chamber at an angle β to an axis along a length of said flow chamber, said differential pressure sensor closed to air flow therethrough, said differential pressure sensor is coupled to said flow chamber by meander passageway through which only diffusion of air takes place and whose length divided by the speed of sound is less than a measuring rate of said differential sensor and said meander passageway is bent to inhibit contaminants from said flow chamber from reaching said differential pressure sensor;
- wherein said angle α is substantially greater than 0° but substantially less than 180° and wherein said angle β is equal to or greater than 90° and less than or equal to 180°.
Dependencies are inferred from the claim text.