An Oxymizer is a specialized nasal cannula with a built-in oxygen reservoir that stores oxygen while you breathe out and delivers it as a concentrated burst when you breathe in. This simple mechanism can reduce the oxygen flow rate you need by 50% to 75%, which means your portable oxygen tanks last significantly longer between refills.
Unlike standard nasal cannulas that deliver a constant, steady stream of oxygen (with much of it wasted during exhalation), the Oxymizer captures that otherwise-lost oxygen in a small reservoir and saves it for your next breath. The result is more efficient oxygen delivery at lower flow settings.
How the Reservoir Works
A standard nasal cannula pushes oxygen into your nostrils continuously, even while you’re breathing out. During exhalation, that oxygen simply escapes into the surrounding air. The Oxymizer solves this by routing the continuous flow into a small reservoir chamber during exhalation. When you inhale, the stored oxygen combines with the fresh flow, delivering a larger bolus of oxygen right at the start of each breath.
This matters because the beginning of each inhalation is when oxygen is most effectively absorbed by the lungs. By front-loading the delivery, the Oxymizer gets more oxygen into your bloodstream per breath than a standard cannula at the same flow rate. In practical terms, this means you can often turn your flow setting down while maintaining the same blood oxygen levels you had at a higher setting with a regular cannula.
One important requirement: the device works best when you breathe in and out through your nose. Research confirms that the Oxymizer requires nasal inhalation and exhalation to maximize its oxygen-saving properties. If you primarily breathe through your mouth, the reservoir won’t fill or deliver as effectively.
Two Styles: Mustache and Pendant
The Oxymizer comes in two designs. The mustache style (model O-100) sits directly under the nose, with the reservoir built into a piece that rests on the upper lip, similar in appearance to a small mustache. The pendant style (model P-224) moves the reservoir down to a small chamber that hangs on the chest, connected by tubing to the nasal prongs. Both work on the same principle, and the choice between them is largely about comfort and appearance.
The pendant version tends to be less noticeable on the face since the reservoir sits lower, which some people prefer for social situations. The mustache version keeps everything compact near the nose. Both are disposable, and the manufacturer recommends replacing them every three weeks.
Who Benefits Most
While anyone on supplemental oxygen can use an Oxymizer, the biggest gains show up in people who need higher flow rates. A study presented at the European Respiratory Society found that patients requiring 4 liters per minute or more saw dramatically better exercise capacity with the Oxymizer compared to a standard cannula. Those high-flow patients increased their endurance time by an average of 161 seconds, while patients on lower flow rates gained only about 20 seconds.
This makes the Oxymizer particularly useful for people with COPD or other lung conditions who struggle during physical activity. If you find yourself needing to crank up your oxygen flow during walks, errands, or exercise, the Oxymizer can deliver the oxygen you need more efficiently without requiring as high a setting.
How It Extends Tank Life
For people who rely on portable oxygen cylinders, the Oxymizer’s efficiency translates directly into freedom. Savings of 50% to 75% are possible depending on your flow rate, breathing rate, and exhalation pattern. In real terms, a portable tank that normally lasts two hours could last three to four hours or more.
This is a significant advantage for staying active outside the home. Portable tanks are heavy and limited in capacity, so stretching each tank further means fewer tanks to carry, fewer refills or exchanges, and longer outings without worrying about running low. For people who use oxygen concentrators at home but switch to tanks when traveling, the Oxymizer can make portable oxygen far more practical.
Comfort and Nasal Dryness
Standard nasal cannulas blow cool, dry air directly into the nasal passages. At flow rates above 4 to 6 liters per minute, this commonly causes mucosal drying, irritation, nosebleeds, and cracking of the tissue inside the nose. These side effects aren’t just uncomfortable; they often lead people to use their oxygen less than prescribed.
Because the Oxymizer lets you achieve the same blood oxygen levels at a lower flow setting, it can reduce the drying effect. Less airflow through the nasal passages means less moisture stripped from the tissue. That said, if you’re on higher flow rates, a humidifier bottle attached to your oxygen source may still be helpful. The Oxymizer itself doesn’t add humidity; it simply reduces how much dry air you need.
Practical Considerations
The Oxymizer is a disposable device with a recommended lifespan of about three weeks per unit. This ongoing replacement cost is worth factoring in, though many users find the savings in oxygen supply and improved quality of life more than offset it. Insurance coverage varies, so checking with your provider beforehand is worthwhile.
The device connects to your oxygen source the same way a standard cannula does, so no special equipment or adapters are needed. You can use it with a home concentrator, a portable concentrator’s continuous flow setting, or compressed gas cylinders. It does not work with pulse-dose delivery systems, since those already use a conservation mechanism that would conflict with the reservoir’s function.
For people who feel tethered to their oxygen supply or limited in how far they can go from home, the Oxymizer is one of the simplest upgrades available. It uses no batteries, has no electronic components, and requires no training beyond putting it on like a regular cannula.