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US 4,905,709 AGranted
Disposable tubular pneumotachometer
AssigneeAdvanced Medical Systems, Inc.
InventorsPaul Bieganski, Timothy E. Schweikert
Life of this patent
Estimating the term…
Abstract
A disposable tubular pneumotachometer in which the air-resistive material covering over the air outlet is a fabric with multiple sub-miniature tubular apertures to provide capillary air flow and, in the preferred form, has a uniformly diverging air outlet formed by air outlet openings through the wall of the pneumotachometer tube and an imperforate proportionally tapered air-diverging surface facing the air outlet openings.
Claims7
A flow sensor for a pneumotachometer, comprising:
- an elongated hollow tubular member opening at both ends, one of said open ends comprising an air inlet for receiving air traveling longitudinally through the tubular member;
- an air outlet through the wall of said tubular member adjacent the other of said open ends;
- means extending part way into the tubular member from the other of said open ends for closing off said other open end and for diverging the longitudinal air flow from the air inlet to said air outlet;
- a thin, air-restrictive covering over said air outlet;
- and
- an air pressure pickoff port extending radially outward through the wall of said tubular member between the air inlet and the air outlet.
3 more elements
Dependencies are inferred from the claim text.