Oxymizer Pendant Cannula - Flow Rates, FiO₂ Chart, Max Flow & How It Works
- What is Oxymizer Pendant Cannula?
- Flow Rates
- FiO₂ Chart
- Max Flow
- How It Works
What is Oxymizer Pendant Cannula?
The Oxymizer pendant cannula is a specialized oxygen delivery device designed to provide higher oxygen efficiency compared to standard nasal cannulas. It features a built-in reservoir, typically located in a small pendant chamber that hangs below the chin. This reservoir stores oxygen during exhalation and delivers it during the next inhalation, allowing patients to receive a higher concentration of oxygen without increasing flow rates significantly.
This device is commonly used for patients with chronic respiratory conditions such as COPD, pulmonary fibrosis, or other causes of hypoxemia. By improving oxygen conservation, the Oxymizer reduces oxygen consumption while maintaining adequate oxygenation. It is especially useful for home oxygen therapy, where conserving oxygen supply can extend tank duration and improve patient mobility and convenience.
Flow Rates
The Oxymizer pendant cannula operates effectively at lower flow rates compared to traditional nasal cannulas. Typical flow rates range from 0.5 to 15 liters per minute (L/min), depending on the patient’s oxygen requirements. At lower flows, the reservoir system allows the patient to receive an equivalent oxygen concentration to what would normally require higher flow rates with a standard cannula.
For example, a patient who might need 4 L/min with a standard nasal cannula may achieve similar oxygenation with 2–3 L/min using an Oxymizer. This makes it particularly beneficial for long-term oxygen users. However, flow rate settings should always be adjusted under medical supervision, as excessive or insufficient oxygen delivery can impact patient outcomes.
FiO₂ Chart
The fraction of inspired oxygen (FiO₂) delivered by an Oxymizer varies depending on flow rate and patient breathing patterns. While exact values may differ, a general approximation is shown below:
| Flow Rate (L/min) | Approx. FiO₂ (%) |
|---|---|
| 1 | 24–28% |
| 2 | 28–34% |
| 3 | 32–40% |
| 4 | 36–45% |
| 5 | 40–50% |
| 6 | 44–55% |
Compared to standard nasal cannulas, the Oxymizer can deliver higher FiO₂ at the same flow rate due to its reservoir effect. However, these values are approximate and can vary based on individual breathing patterns, tidal volume, and respiratory rate.
Max Flow
The maximum recommended flow rate for the Oxymizer pendant cannula is typically around 15 L/min, although most patients use it at much lower levels. At higher flows, the benefit of the reservoir effect may decrease, and other oxygen delivery devices such as masks may be more appropriate.
Using flow rates above recommended limits can also lead to patient discomfort, dryness of nasal passages, or reduced effectiveness. Therefore, clinicians carefully determine the optimal flow range based on oxygen saturation levels and clinical condition. The device is most efficient when used within its designed range for oxygen conservation.
How It Works
The Oxymizer pendant cannula works by storing oxygen in a small reservoir during the exhalation phase of breathing. Normally, oxygen delivered by a standard cannula is wasted during exhalation. However, in the Oxymizer system, this oxygen is captured and held in the reservoir.
During the next inhalation, the stored oxygen is delivered along with the continuous oxygen flow, resulting in a higher concentration of oxygen entering the lungs. This process improves oxygen efficiency and reduces the amount of oxygen needed overall. The design allows patients to achieve adequate oxygenation while conserving oxygen supply, making it a highly effective device for long-term oxygen therapy.
Reviewed by Simon Albert
on
January 25, 2026
Rating:
