Physiologic-range flow and pressure sensor for respiratory systems

A low-cost but reliable flow and pressure sensor is an impediment to development of medical equipment, and studies of human respiratory function, which is characterised by relatively low pressures and flows. A Venturi tube ([Formula: see text]) connected to a differential pressure sensor (SDP816-125 Pa) allows accurate measurement of flow between [Formula: see text] , with Pearson Correlation over 4 min at [Formula: see text] [Formula: see text] , and distance correlation [Formula: see text]. The pressure measurement was similarly accurate using a MPVZ4006GW7U. Both sensors provide an analogue output from a [Formula: see text] supply, aiding compatibility and customisation. Each populated PCB costs approximately $50USD, and each Venturi sensor costs approximately $1USD. Multiple configurations exist, allowing flow rates up to [Formula: see text] , increased resolution for specific ranges, and different physical characteristics.