Respiratory pressure and split flow data collection device with rapid occlusion attachment

Ella F S Guy; Jaimey A Clifton; Jennifer L Knopp; Lui R Holder-Pearson; J Geoffrey Chase

doi:10.1016/j.ohx.2023.e00489

Respiratory pressure and split flow data collection device with rapid occlusion attachment

HardwareX. 2023 Nov 11:16:e00489. doi: 10.1016/j.ohx.2023.e00489. eCollection 2023 Dec.

Authors

Ella F S Guy¹, Jaimey A Clifton¹, Jennifer L Knopp¹, Lui R Holder-Pearson², J Geoffrey Chase¹

Affiliations

¹ Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand.
² Department of Electrical Engineering, University of Canterbury, Christchurch, New Zealand.

Abstract

Respiratory model-based methods require datasets containing enough dynamics to ensure model identifiability for development and validation. Rapid expiratory occlusion has been used to identify elastance and resistance within a single breath. Currently accepted practice for rapid expiratory occlusion involves a 100 ms occlusion of the expiratory pathway. This article presents a low-cost modular rapid shutter attachment to enable identification of passive respiratory mechanics. Shuttering faster than 100 ms creates rapid expiratory occlusion without the added dynamics of muscular response to shutter closure, by eliminating perceived expiratory blockage via high shutter speed. The shutter attachment fits onto a non-invasive venturi-based flow meter with separated inspiratory and expiratory pathways, established using one-way valves. Overall, these elements allow comprehensive collection of respiratory pressure and flow datasets with relatively very rapid expiratory occlusion.

Keywords: CPAP; Flow; Occlusion; Pressure; Respiration; Shutter; Venturi.