Both types of ventilators function by delivering controlled air or oxygen-air mixtures into the patientβs lungs via a breathing circuit.
Key Working Principles:
1. Modes of Ventilation
β’Invasive modes (e.g., Assist-Control, SIMV, PRVC) via endotracheal or tracheostomy tube
β’Non-invasive modes (e.g., CPAP, BiPAP) via facial/nasal mask
2. Gas Delivery
β’The ventilator blends oxygen and air, adjusting pressure, volume, and rate.
β’Delivers gases using pressure or volume-controlled cycles based on the patientβs need.
3. Monitoring & Alarms
β’Measures tidal volume, respiratory rate, pressure, SpOβ, EtCOβ.
β’Includes alarms for apnea, circuit disconnection, high pressure, or low tidal volume.
4. Portability
β’Transport ventilators are lightweight, battery-powered, and rugged.
β’May include turbine or compressor systems for use without external gas supply.