Ventilator Bellows Assembly

Ventilator Bellows Assembly

OurVentilator Bellows Assembly is a critical pneumatic component in invasive ventilators, especially anesthesia machines and emergency ventilators. It is typically located at the inspiratory and expiratory ends of the ventilator, connecting the internal gas circuit to the patient circuit.

ventilator bellows assembly

Ventilator Bellows Assembly

Functions

1. Gas Delivery and Isolation
   • Primary Role: It acts as a flexible “gas reservoir” that delivers heated, humidified, and pressurized mixed gases (oxygen, air, etc.) to the patient during inspiration and collects exhaled gases during expiration.
   • Physical Isolation: It separates the ventilator’s sensitive internal sensors and valves from the external patient circuit. This prevents moisture, secretions, or bacteria from the patient’s exhaled gas from entering the machine, protecting core components from corrosion and contamination.
2. Pressure Buffering and Compliance Compensation
   • Pressure Buffering: In high‑pressure ventilation modes, the elastic deformation of the bellows provides a buffering effect, preventing sudden high pressure from directly impacting the patient’s lungs.
   • Compliance Compensation: Modern ventilators calculate and compensate for the volume of gas that fills the bellows itself (compliance). By monitoring bellows movement or pressure changes, the ventilator automatically adjusts the delivered tidal volume to ensure accurate ventilation.
3. Visual Monitoring
   • The transparent design allows medical staff to visually check gas flow and bellows movement, helping to confirm proper ventilator operation.
4. PEEP/CPAP Maintenance
   • On the expiratory side, the bellows works with the PEEP valve to maintain positive pressure at the end of expiration, keeping the alveoli open and preventing lung collapse.