Abstract
High-frequency jet ventilators lacking flow monitoring systems, and information about supplied tidal volumes are still missing. This complicates the jet ventilator’s initial setting; at the same time, it complicates the line of the high-frequency ventilation itself. Therefore, an experimental flow sensor (orifice plate) was designed and placed in the ETC (endotracheal tube). Laboratory tests have confirmed the solution’s functionality, but it was necessary to verify the practical applicability for the clinical environment. The experiment shows that the flow sensor is used only for research purposes or when using functional monitoring of chest excursions.
Highlights
High-Frequency Ventilation (HFV) is a therapeutic technique, using a fast supply of very small breaths, comparable to the volume of the patient’s anatomical dead space [? ]
The typical respiratory rate is greater than four times the normal value of spontaneous breathing; tidal volumes are in the order of milliliters
Two high-frequency ventilation techniques are currently used in neonatal clinical practice—HFOV (High-Frequency Oscillatory Ventilation) and HFJV (High-Frequency Jet Ventilation), with a unique ventilator—Life Pulse (Bunnell Inc., Salt Lake City, UT, USA) [? ? ]
Summary
High-Frequency Ventilation (HFV) is a therapeutic technique, using a fast supply of very small breaths, comparable to the volume of the patient’s anatomical dead space [? ]. ]. The typical respiratory rate is greater than four times the normal value of spontaneous breathing; tidal volumes are in the order of milliliters. This reduces the risk of damage to lung tissue. There is the absence of flow monitoring or the absence of information on the supplied tidal volumes This complicates the initial setting of the jet ventilator (currently performed according to sufficient chest vibrations). It complicates the line of the high-frequency ventilation itself, and it is not easy to maintain the required PaCO2. Given the importance of TV (Tidal Volume), it can be assumed that monitoring of this parameter must become an integral part of HFJV in the future [? ? ]
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