Pressure stability with CPAP devices: A bench evaluation

Louis, Bruno; Leroux, Karl; Boucherie, Maud; Isabey, Daniel; Grillier-Lanoir, V; Fauroux, Brigitte; Lofaso, Frédéric

doi:10.1016/j.sleep.2009.02.011

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…11 Moreover, the additional work of breathing may induce respiratory muscle fatigue and discomfort in patients with acute respiratory failure. 12 With regard to these premises, the majority of devices included in this study may not adequately assist patients because these devices showed a huge fluctuation of the airway pressures around the imposed PEEP level. During the eupneic and tachypneic breathing pattern simulations, the Dimar Easyvent, Deas Flowone, and Superflow showed the lowest pressure swing around the imposed PEEP level, which suggested a better ability to reduce the work of breathing.…”

Section: Discussionmentioning

confidence: 99%

Performances of CPAP Devices With an Oronasal Mask

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Performances of CPAP Devices With an Oronasal Mask

et al. 2018

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“…Since the airflow direction is reversed from exhalation to inhalation it is technically easy to identify the breathing phase and to adjust the pressure correspondingly. Another advantage that the flow transducer offers is it makes it possible to compensate flow loss caused by air leaks, which in turn is helpful in maintaining constant CPAP [17,18]. …”

Section: Discussionmentioning

confidence: 99%

Control system design for a continuous positive airway pressure ventilator

Chen¹,

Hu²,

Dai

2012

BioMedical Engineering OnLine

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Continuous Positive Airway Pressure (CPAP) ventilation remains a mainstay treatment for obstructive sleep apnea syndrome (OSAS). Good pressure stability and pressure reduction during exhalation are of major importance to ensure clinical efficacy and comfort of CPAP therapy. In this study an experimental CPAP ventilator was constructed using an application-specific CPAP blower/motor assembly and a microprocessor. To minimize pressure variations caused by spontaneous breathing as well as the uncomfortable feeling of exhaling against positive pressure, we developed a composite control approach including the feed forward compensator and feedback proportional-integral-derivative (PID) compensator to regulate the pressure delivered to OSAS patients. The Ziegler and Nichols method was used to tune PID controller parameters. And then we used a gas flow analyzer (VT PLUS HF) to test pressure curves, flow curves and pressure-volume loops for the proposed CPAP ventilator. The results showed that it met technical criteria for sleep apnea breathing therapy equipment. Finally, the study made a quantitative comparison of pressure stability between the experimental CPAP ventilator and commercially available CPAP devices.

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“…Each experiment was run for 6 h, a period chosen to represent typical nocturnal NPPV use [6]. Control pressure, flow and humidity readings were taken for 20 consecutive steady-state breaths 30 min into the experiment when the humidifier had reached a stable operating temperature.…”

Section: Study Protocolmentioning

confidence: 99%

“…In an attempt to simulate clinical conditions and provide guidance on the likely appearance of tubing condensate, we studied the relationship between room temperature and humidifier setting on tubing condensate formation, pressure delivery and delay in pressure cycling [6][7][8]. The effect of insulating or heating the tubing to reduce tubing condensate formation and subsequent pressure and cycling affects is also examined.…”

Section: Introductionmentioning

confidence: 99%