Development of a test bench for ventilation masks through 2D and 3D printing processes

Objective: Mask choice is a key parameter in adaptation of ventilation through continuous positive airway pressure i.e. sleep apnea syndrome golden standard treatment. Two parameters of mask poor tolerance are cutaneous over pressure and unintentional leaks. The aim of this study was to create a test bench for masks to compare and localize cutaneous pressure areas, while monitoring leak flow. Methods: The test bench is made of an artificial head on which customs-made pressure sensors were placed. The artificial head and the sensors were developed with various additive manufacturing technologies. Sensors measured electrical capacity variations (%VC) positively correlated with cutaneous pressure. For 4 different masks, different harness tightening conditions were tested. A flowmeter was used to monitor total leaks. Results: When displayed on the nasal bridge of the artificial head, sensors detected tightening conditions: average of + 2%VC when harness was tight. This increase varied according to masks [1; 3]%VC and the sensors position [1.3; 2.2]%VC. Conclusion: This bench test allowed us to compare masks between them. Indeed it allowed us to localize and compare high pressure areas according to the mask. These data could be helpful for physicians and health professionals in the choice of the mask and for manufacturers in the development process