Venturi Masks

Components of a Venturi Mask Setup

• Aerosol mask
• Corrugated tubing
• Oxygen line (connects to the flow meter)
• Venturi piece (fixed orifice device)
  • Different colors indicate different percentages of oxygen and liter flow
  • Example: Orange piece indicates 50% oxygen at 15 liters
• Air entrainment ports piece (keeps the air holes patent)

Key Features and Principles

• Exact FiO2 delivery: Only oxygen device that delivers exact percentages of oxygen
• Venturi principle: Operates by using different sized orifices to mix the appropriate amount of air with oxygen
• Fixed orifices: Specific flow rates (e.g., 15 liters for 50% oxygen)

Assembly Instructions

1. Attach corrugated tubing to the mask.
2. Attach the Venturi piece to the tubing.
   • The oxygen tubing connects to the Venturi piece.
3. Ensure the air entrainment ports piece is in place to keep air holes open.
   • Prevents obstruction which could alter the oxygen percentage.

Important Considerations

• Air entrainment ports: Must remain open to ensure correct oxygen mixing.
  • Obstruction (e.g., by sheet) increases oxygen concentration beyond intended percentage.

Other Orifices

• Different colors represent different oxygen percentages and corresponding liter flow
  • Next segment will detail specific percentages and liter requirements.