Hailey Tran
Oxygen machines are medical devices that provide patients with oxygen-enriched air to support their breathing. They are used for people with conditions that affect their lungs or breathing, such as asthma, lung cancer, or chronic obstructive pulmonary disease (COPD). There are several types of oxygen machines, including oxygen concentrators, continuous positive airway pressure (CPAP) devices, and nasal cannulas. Oxygen concentrators separate nitrogen from the air to provide up to 95% pure oxygen, while CPAP devices help keep patients' airways open by applying mild air pressure. Nasal cannulas are a simple and inexpensive option, delivering oxygen through two short prongs inserted into the patient's nostrils. To monitor a patient's oxygen levels, healthcare professionals use devices called pulse oximeters, which estimate blood oxygen saturation by sending light beams through the fingertip or earlobe. Pulse oximetry is a non-invasive and painless procedure that can quickly detect changes in oxygen levels, helping doctors decide on treatments. However, it's important to note that pulse oximeters may be less accurate for individuals with darker skin tones due to higher melanin levels.
| Characteristics | Values |
|---|---|
| Purpose | To monitor oxygen levels and pulse rate |
| Use | Usually clipped onto a fingertip, but can also be attached to the earlobe or toe |
| Mechanism | Sends beams of light through body tissue to measure oxygen saturation |
| Readings | Displayed as a steady number |
| Accuracy | Can be affected by skin pigmentation, skin thickness, skin temperature, tobacco use, fingernail polish, and poor circulation |
| Interpretation | Readings should be considered alongside symptoms and other vital information |
| Prescription | Required for certain devices like CPAP and BiPAP |
| Oxygen Therapy Devices | Oxygen concentrators, compressed oxygen tanks, liquid oxygen tanks, nasal cannulas, and more |
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What You'll Learn
Understanding oxygen concentrators
Oxygen concentrators are medical devices that separate nitrogen from the air and supply the user with up to 95% pure, oxygen-enriched air. They are used to treat patients with conditions that affect their breathing, such as lung cancer, heart failure, or sleep apnea. They are also used industrially and to provide supplemental oxygen at high altitudes.
Oxygen concentrators are either stationary or portable. Stationary concentrators weigh about 10 kilograms and run on electricity, with some models offering a battery backup. Portable concentrators are smaller and lighter, making them ideal for travel, but their oxygen output is usually lower. Most portable oxygen concentrators use rechargeable lithium-ion batteries.
Oxygen concentrators provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. They are widely used in healthcare applications, especially in homes or portable clinics, where liquid or pressurized oxygen is dangerous or inconvenient.
Oxygen concentrators utilize a series of processes to extract and concentrate oxygen from ambient air, including filtration, compression, molecular sieves, oxygen sensors, and regulators. They ensure that the delivered oxygen is clean and free from contaminants.
Oxygen concentrators became the preferred and most common means of delivering home oxygen. They were invented in the early 1970s, revolutionizing home medical oxygen therapy, which previously relied on heavy high-pressure oxygen cylinders or small liquid oxygen systems that required frequent replenishment.
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Pulse oximetry basics
Pulse oximetry is a test that measures the oxygen level (oxygen saturation) in the blood. It is a quick, non-invasive, and painless procedure that helps determine how efficiently blood is delivering oxygen to the extremities, such as the arms and legs. It is considered a valuable tool for monitoring oxygenation continuously, accurately, and non-invasively.
The pulse oximeter device is usually clipped onto a fingertip, earlobe, or toe and uses light beams to estimate a person's blood oxygen level and pulse rate. The light beams, which are red and infrared, pass through the tissues, including the nail, skin, and blood, to measure oxygen saturation. The amount of oxygen in the tissue affects how well the light is absorbed. The sensor in the clip measures how much light passes through without being absorbed, providing an estimation of blood oxygen levels.
While pulse oximetry is widely used and considered precise, it has limitations and a risk of inaccuracy. Factors such as skin pigmentation, skin thickness, skin temperature, tobacco use, and fingernail polish can affect the accuracy of readings. People with darker skin tones, for example, may have higher readings due to increased melanin, which can lead to a potential overdiagnosis and overtreatment. Therefore, it is important to consider the context, symptoms, and other factors when interpreting pulse oximeter readings.
To obtain an accurate reading, it is recommended to follow certain procedures. Before placing the device on the finger, ensure that your hand is warm, relaxed, and held below heart level. Remove any jewelry or fingernail polish from the finger. Sit still and avoid moving the body part where the device is located. Wait for the reading to stabilize and record the oxygen level, date, and time for tracking purposes.
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CPAP and BiPAP devices
CPAP and BiPAP are both forms of positive airway pressure therapy, which uses pressurised air to regulate breathing. They are often used to treat sleep apnea, a breathing disorder that affects approximately 10-30% of people. CPAP, or continuous positive airway pressure, provides constant air pressure and is the most common PAP treatment. BiPAP, or bilevel positive airway pressure, offers two pressure settings: one for inhalation and a lower one for exhalation. BiPAP machines can automatically switch between these two settings, allowing for lower pressure levels during exhalation.
CPAP machines have a single setting, providing constant air pressure regardless of whether the user is inhaling or exhaling. They are typically the first treatment option for obstructive sleep apnea (OSA), which is caused by a blockage in the upper airway. However, some CPAP models now have a pressure relief option that allows for gentler air pressure on exhalation.
BiPAP machines, on the other hand, have two air pressure levels that are set by a clinician and work together to normalise breathing. BiPAP is useful for people with OSA who do not respond well to CPAP. It is also used to treat central sleep apnea (CSA), which is caused by the brain failing to send signals to the muscles that control breathing. BiPAP machines are generally more expensive than CPAP machines due to their advanced features and more complex algorithms.
While CPAP is typically tried first, a doctor may recommend BiPAP therapy before CPAP in certain situations. BiPAP machines are also used to treat a number of other less common sleep breathing disorders. The decision to switch between CPAP and BiPAP treatments should always be made under the advice of a healthcare team.
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Oxygen flow meters
There are two common styles of oxygen flow meters: Thorpe Style and Dial Style. Thorpe style is the most popular and uses a clear tube LPM meter to gauge flow. Dial style flowmeters are more compact and durable but lack the clear tube, relying on a dial reading set using a click dial.
To read an oxygen flow meter, you measure from the top of the bobbin or ball to the scale located on or beside the flow meter tube. The number on the scale indicates the flow rate. It is important to note that bobbin flow meters are designed to be read from the top, while ball flow meter measurements should be taken from the middle of the ball.
It is crucial to maintain oxygen flow meters properly to ensure accurate readings and safe oxygen therapy for patients. This includes regularly servicing the equipment, keeping it free from moisture, dust, and dirt, and ensuring the indicator floats freely.
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Nasal cannulas
A nasal cannula is a device that delivers additional oxygen through a thin, flexible tube that goes around your head and into your nose. There are two prongs that go inside your nostrils to deliver the oxygen. The tube is attached to an oxygen source, such as a tank or container.
High-flow nasal cannulas deliver warm oxygen to prevent the nasal passages from drying out quickly. They are useful in providing respiratory support and can be more effective than conventional oxygen devices in some cases. They are also well-tolerated by patients, allowing them to communicate and even eat while receiving oxygen therapy.
However, it is important to be cautious when using oxygen devices like nasal cannulas. Oxygen is highly flammable, so it should not be used near open flames or flammable materials. Additionally, receiving too much oxygen can have risks, such as causing lung damage or pulmonary oxygen toxicity. Therefore, it is crucial to follow the recommendations of your healthcare provider regarding the appropriate flow rate and usage of the nasal cannula.
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Frequently asked questions
An oxygen machine, also known as an oxygen concentrator, is a medical device that separates nitrogen from the air to provide higher oxygen levels. It can be used to help patients breathe when they are unable to breathe on their own.
A pulse oximeter is a small device that clips onto a fingertip, earlobe, or toe. It uses light beams to estimate a person's blood oxygen level and pulse rate. To get an accurate reading, ensure your hand is warm and relaxed, and held below the level of the heart. Remove any jewellery or fingernail polish from the finger. Wait for a steady reading and write down the oxygen level, date, and time.
Oxygen therapy machines include oxygen concentrators, continuous positive airway pressure (CPAP) devices, BiPAP devices, oxygen flow meters, and nasal cannulas. Oxygen concentrators are stationary or portable devices that provide pure oxygen. CPAP and BiPAP devices assist patients with breathing and keeping their airways open. Oxygen flow meters control the flow rate of oxygen, and nasal cannulas are simple tubing devices with prongs inserted into the patient's nostrils.
