This refers to a method of delivering supplemental oxygen that releases oxygen only during inhalation, rather than continuously. The device senses the start of a breath and delivers a bolus of oxygen, then ceases delivery until the next breath is detected. A common example is a portable oxygen concentrator that delivers oxygen in discrete “pulses” as the user inhales.
This delivery method offers several advantages over continuous flow systems. It conserves oxygen, extending the usage time of portable oxygen sources. It can also reduce the cost of oxygen therapy, as less oxygen is consumed. Furthermore, it can improve comfort by reducing nasal dryness, a common side effect of continuous oxygen delivery. Historically, these systems evolved to provide more efficient and convenient oxygen therapy, particularly for ambulatory patients.