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Physiologic-range flow and pressure sensor for respiratory systems

2021; Elsevier BV; Volume: 10; Linguagem: Inglês

10.1016/j.ohx.2021.e00227

2468-0672

Lui Holder-Pearson, J. Geoffrey Chase,

Bluetooth and Wireless Communication Technologies

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 ( D1=15mm,D2=10mm ) connected to a differential pressure sensor (SDP816-125 Pa) allows accurate measurement of flow between 5-75L·min-1 , with Pearson Correlation over 4 min at 50Hz⩾0.97 , and distance correlation ⩾0.96 . The pressure measurement was similarly accurate using a MPVZ4006GW7U. Both sensors provide an analogue output from a 5.0V 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 250L·min-1 , increased resolution for specific ranges, and different physical characteristics.