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Fig. 1 | BMC Pulmonary Medicine

Fig. 1

From: Efficacy and safety of oxygen-sparing nasal reservoir cannula for treatment of pediatric hypoxemic pneumonia in Uganda: a pilot randomized clinical trial

Fig. 1

Experimental apparatus for the pre-clinical design and testing of oxygen-sparing nasal reservoir cannula (OSNRC). a. Image of experimental breathing circuit, consisting of OSNRC, SNC, model face and upper airway, coupled with a breathing simulator. b. Schematic of the experimental apparatus. c. Image of OSNRC placed on 3D printed anatomically accurate face model. The OSNRC fits over a standard nasal cannula (SNC). d. Breathing waveforms (normal and diseased conditions) used to represent a 12 kg patient. Inspiratory to expiratory (I/E) ratios ranged from 0.33–1 and respiratory rate ranged from 30 to 60 breaths per minute (BPM)

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