Correvon Nils, Michotte Jean-Bernard, Contal Olivier
School of Health Sciences (HESAV), HES-SO University of Applied Sciences and Arts of Western Switzerland, 1005 Lausanne, Switzerland.
Healthcare (Basel). 2022 Nov 7;10(11):2229. doi: 10.3390/healthcare10112229.
During the COVID-19 breakout, a global call for low-cost portable ventilators was made following the strong demand for ventilatory support techniques. Among a few development projects, COVIDair non-invasive ventilator was developed and produced in a record time during the critical period of spring 2020.
To evaluate COVIDair performance (i.e., inspiratory trigger delay time, TDT, pressurization time and inspiratory to expiratory time ratio, I:E) on a test bench simulating physiological characteristics of breathing.
Performance tests were conducted on a breathing simulator (ASL 5000, IngMar Medical™) in two different lung mechanics (i.e., normal and severe restrictive).
Under normal pulmonary mechanics, the inspiratory TDT is on average between 89.0 (±2.1) and 135.0 (±9.7) ms. In a situation of severe restrictive pulmonary mechanics, the inspiratory TDT is on average between 80 (±3.1) and 99.2 (±5.5) ms. Pressurization time to pre-set inspiratory pressure was on average from 234.6 (±5.5) to 318.6 (±1.9) ms. The absolute difference between the actual I:E cycling measure and the pre-set I:E cycling value ranged from 0.1 to 10.7% on average.
In normal and severe restrictive pulmonary mechanics scenarios, the performance of COVIDair meets the expected standards for non-invasive ventilators.
在新冠疫情爆发期间，由于对通气支持技术的强烈需求，全球呼吁开发低成本便携式呼吸机。在众多开发项目中，COVIDair无创呼吸机于2020年春季的关键时期在创纪录的时间内研发并生产出来。
在模拟呼吸生理特征的试验台上评估COVIDair的性能（即吸气触发延迟时间、TDT、增压时间和吸气与呼气时间比，I:E）。
在呼吸模拟器（ASL 5000，英格玛医疗™）上针对两种不同的肺力学情况（即正常和严重限制性）进行性能测试。
在正常肺力学情况下，吸气TDT平均在89.0（±2.1）至135.0（±9.7）毫秒之间。在严重限制性肺力学情况下，吸气TDT平均在80（±3.1）至99.2（±5.5）毫秒之间。达到预设吸气压力的增压时间平均为234.6（±5.5）至318.6（±1.9）毫秒。实际I:E循环测量值与预设I:E循环值之间的绝对差值平均在0.1%至10.7%之间。
在正常和严重限制性肺力学情况下，COVIDair的性能符合无创呼吸机的预期标准。
