Oxygen mask

Medical plastic oxygen masks are used primarily by medical care providers for oxygen therapy because they are disposable and so reduce cleaning costs and infection risks. Mask design can determine accuracy of oxygen delivered with many various medical situations requiring treatment with oxygen. Oxygen is naturally occurring in room air at 21% and higher percentages are often essential in medical treatment. Oxygen in these higher percentages is classified as a drug with too much oxygen being potentially harmful to a patient's health, resulting in oxygen dependence over time, and in extreme circumstances patient blindness. For these reasons oxygen therapy is closely monitored. Masks are light in weight and attached using an elasticated headband or ear loops. They are transparent for allowing the face to be visible for patient assessment by healthcare providers, and reducing a sensation of claustrophobia experienced by some patients when wearing an oxygen mask. The vast majority of patients having an operation will at some stage wear an oxygen mask; they may alternatively wear a nasal cannula but oxygen delivered in this way is less accurate and restricted in concentration.

The global disposable oxygen masks market, according to Altus Market Research, has the potential to grow by USD 1.1 billion between 2019 and 2023. The market's growth pace will also pick up speed throughout this time.[1]

Silicone and rubber oxygen masks are heavier than plastic masks. They are designed to provide a good seal for long-duration use by aviators, medical research subjects, and hyperbaric chamber and other patients who require administration of pure oxygen, such as carbon monoxide poisoning and decompression sickness victims. Dr. Arthur H. Bulbulian pioneered the first modern viable oxygen mask, worn by World War II pilots and used by hospitals.[2] Valves inside these tight-fitting masks control the flow of gases into and out of the masks, so that rebreathing of exhaled gas is minimised.

Hoses or tubing connect an oxygen mask to the oxygen supply. Hoses are larger in diameter than tubing and can allow greater oxygen flow. When a hose is used it may have a ribbed or corrugated design to allow bending of the hose while preventing twisting and cutting off the oxygen flow. The quantity of oxygen delivered from the storage tank to the oxygen mask is controlled by a valve called a regulator. Some types of oxygen masks have a breathing bag made of plastic or rubber attached to the mask or oxygen supply hose to store a supply of oxygen to allow deep breathing without waste of oxygen with use of simple fixed flow regulators.

Emergency oxygen masks deployed

Most commercial aircraft are fitted with oxygen masks for use when cabin pressurization fails.[8][9] In general, commercial aircraft are pressurized so that the cabin air is at a pressure equivalent to no more than 8,000 feet (2,400 m) altitude (usually somewhat lower altitude), where one can breathe normally without an oxygen mask. If the oxygen pressure in the cabin drops below a safe level, risking hypoxia, compartments containing the oxygen masks will open automatically, either above or in front of the passenger and crew seats, and in the lavatories.

In the early years of commercial flight, before pressurized cabins were invented, airliner passengers sometimes had to wear oxygen masks during routine flights.

Firefighters and emergency service workers use full face masks that provide breathing air as well as eye and face protection.[10] These masks are typically attached to a tank carried upon the back of the wearer and are called self-contained breathing apparatuses (SCBA).[11] Open circuit SCBAs do not normally supply oxygen, as it is not necessary and constitutes a fire hazard. Rebreather SCBAs usually supply oxygen as this is the lightest and most compact option, and uses a simpler mechanism than other types of rebreather.

Specialized full-face masks that supply oxygen or other breathing gases are used by astronauts to remove nitrogen from their blood before space walks (EVA).

Specialized snout masks which supply oxygen to revive family pets have been donated to fire departments.[12][13][14]

Divers only use pure oxygen for accelerated decompression, or from oxygen rebreathers at shallow depths where the risk of acute oxygen toxicity is acceptable. Oxygen supply during in-water decompression is via rebreather, open circuit diving regulator, full-face mask or diving helmet which has been prepared for oxygen service.[15]

Built-in breathing system

US Navy Divers test built-in breathing masks inside a recompression chamber

Oxygen supply to divers in decompression chambers is preferably through a built-in breathing system, which uses an oxygen mask plumbed into supply and exhaust hoses which supply oxygen from outside the chamber, and discharge the exhaled oxygen-rich gas outside the chamber, using a system equivalent to two demand valves, one upstream of the diver, to supply oxygen on demand, and the other downstream, to exhaust exhaled gas on demand, so that the oxygen partial pressure in the chamber is limited to relatively safe levels. If oxygen masks are used that discharge into the chamber, the chamber air must be replaced frequently to keep the oxygen level within safe operating limits.

Anesthesia masks are face masks that are designed to administer anesthetic gases to a patient through inhalation. Anesthesia masks are either made of anti-static silicone or rubber, as a static electricity spark may ignite some anesthetic gases. They are either black rubber or clear silicone. Anesthesia masks fit over the mouth and nose and have a double hose system. One hose carries inhaled anesthetic gas to the mask and the other brings exhaled anesthetic gas back to the machine. Anesthesia masks have 4 point head strap harnesses to securely fit on the head to hold the mask in place as the anaesthesia doctor controls the gases and oxygen inhaled.

Oxygen masks are used by climbers of high peaks such as Mount Everest.[16] Because of the severe cold and harsh conditions oxygen masks for use at extreme altitude must be robust and effective. The oxygen storage tanks used with the masks (called oxygen bottles) are made of lightweight, high-strength metals and are covered in high-strength fiber such as kevlar. These special oxygen bottles are filled with oxygen at a very high pressure which provides a longer time duration of oxygen for breathing than standard pressure oxygen bottles. These systems are generally only used above 7,000 metres (23,000 ft).

In recent years oxygen mask systems for high-altitude climbing which pump oxygen constantly have been increasingly replaced by systems supplying oxygen on demand via nasal cannulas.

Oxygen helmets are used in hyperbaric oxygen chambers for oxygen administration.[2] They are transparent, lightweight plastic helmets with a seal that goes around the wearer's neck that looks like a space suit helmet. They offer a good visual field. Light weight plastic hoses provide oxygen to the helmet and remove exhaled gas to the outside of the chamber. Oxygen helmets are often preferred for oxygen administration in hyperbaric oxygen chambers for children and patients that are uncomfortable wearing an oxygen mask.

Medical oxygen masks are held in place by medical personnel or the user by hand, or they may be fitted with a lightweight elastic headband so the mask can be removed quickly. Full-face masks are secured by several straps. Tightly fitting oxygen masks are secured at four points by two head straps. Aviators' masks are often equipped with "quick don" harnesses that allow those in pressurized aircraft to rapidly don the masks in emergencies. Military aviators' oxygen masks are secured to flight helmets with quick-release systems.

Wikimedia Commons has media related to Oxygen masks.

• Emergency oxygen system
• Full face diving mask
• Nasal cannula – Medical device
• Oxygen therapy – Use of oxygen as a medical treatment
• Hyperbaric medicine, also known as Hyperbaric oxygen therapy – Medical treatment at raised ambient pressure
• Oxygen tent – A canopy placed over a patient to provide oxygen at a higher level than normal
• Bottled oxygen (climbing) – Oxygen stored in portable high pressure cylinders