The HFO uses membrane oscillation.

The powerful, optionally integrated Leoni high-frequency oscillatory ventilation (HFO) module utilizes membrane oscillation. Bidirectional flow, adjustable frequencies from 5 to 20 Hz, and amplitudes up to 100 mbar ensure lung-protective alveolar oxygenation and highly efficient CO₂ removal. The HFO is available for both invasive and non-invasive ventilation. Spontaneous breathing is possible at any time and is supported by adjustable recruitment maneuvers and a volume guarantee. Amplitude control is regulated and compensates for leaks and compliance variations.