Customized oxygen concentrators are medical devices that are used to provide concentrated oxygen to patients who require it. They are commonly used in hospitals, nursing homes, and in-home care settings. 
A customized oxygen concentrator works by taking in air from the surrounding environment and compressing it. The compressed air is then passed through a molecular sieve that traps nitrogen and other gases, leaving behind concentrated oxygen. The concentrated oxygen is then delivered to the patient through a nasal cannula or mask. 
There are two types of customized oxygen concentrators: stationary and portable. Stationary oxygen concentrators are designed to provide continuous oxygen flow for patients who require it at all times. Portable oxygen concentrators, on the other hand, are smaller and more lightweight, making them suitable for patients who require oxygen therapy while on the go. 
Customized oxygen concentrators are an essential medical device for patients with chronic obstructive pulmonary disease (COPD), emphysema, or other respiratory conditions. They provide a reliable and safe source of oxygen to patients, helping them breathe easier and improving their overall quality of life.