How Much Pressure Is In A Hyperbaric Chamber

The working principle of the hyperbaric oxygen chamber is actually not complicated. The core is to raise the ambient pressure in the chamber to 1.5 to 3.0 times the standard atmospheric pressure (1 ATA, about 14.7 psi) at sea level. At the same time, let the patient inhale 100 percent pure oxygen, thereby accelerating the body repair. This pressure environment, measured as “absolute atmospheric pressure” (ATA), actually simulates a depth of 15 to 33 feet underwater, which is critical when treating decompression sickness or chronic wounds.

Pressure Details In Hyperbaric Oxygen Therapy

The pressure setting in the cabin is absolutely not arbitrary, but accurately calibrated based on specific clinical needs.

Routine Treatment Range

Most medical HBOT treatments are typically limited to a specific window of 2.0 to 3.0 ATA. Keeping in this pressure range is the only way to ensure that the body gets enough oxygen saturation to successfully carry out tissue repair and infection control.

Conversion Of Pressure Units (ATA And PSI)

In order to intuitively understand the strength in the cabin, we have to look at the data conversion: 1 ATA is equivalent to 14.7 psi at sea level, 2 ATA is 29.4 psi, and 3 ATA is 44.1 psi. When the pressure rises to 3 ATA, the cabin environment simulates the hydrostatic pressure at 33 feet underwater, which is no joke.

The Difference Between Medical Class Cabin And Mild (Soft) Cabin

The market equipment is mixed, do not confuse the professional medical equipment and those so-called “light” or “soft” cabin.

Medical-Grade Hardware Cabin: This is a professionally certified clinical-grade environment capable of safely maintaining pressures up to 3.0 ATA. They are designed to handle hard core medical needs such as decompression sickness, carbon monoxide poisoning, and complex chronic wounds.

Light/Soft: This portable or soft device can usually only reach a pressure of 1.3 to 1.5 ATA.

The Science Of Stress

HBOT’s efficacy is based entirely on two laws of physics:

Boyle’s Law: The high pressure in the cabin can compress the volume of air bubbles in the human body, which is the key to the treatment of decompression sickness, so that the nitrogen bubbles are squeezed and dissolved.

Henry’s Law: As the pressure of inhaled oxygen increases, the amount of oxygen directly dissolved in the plasma increases significantly. This allows oxygen to reach tissues that have poor blood flow due to injury or chronic disease.

Security Protocols And Monitoring

Although hyperbaric oxygen therapy is effective, safety is always the first stone in the heart. In medical-grade hyperbaric oxygen chambers, trained professionals monitor the pressure throughout the entire process to ensure that the pressurization and depressurization process is always within a comfortable and safe range for the patient. Patients are under real-time observation throughout the treatment.

As for side effects, although the high-pressure environment is well tolerated in most cases, there are some hidden dangers. For example, barotrauma (ear or sinus discomfort) or, rarely, temporary myopia. As for neurological effects, high pressure may induce epilepsy in rare cases, which is why we have extremely strict implementation standards for the upper limit of pressure.

Author：James Henderson

I am a clinical researcher specializing in hyperbaric medicine and oxygen therapy. With over a decade of experience in managing hyperbaric oxygen therapy (HBOT) units, my work focuses on educating patients on the safety, physics, and therapeutic benefits of pressurized oxygen treatments.