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The positive-pressure breathing system consisted of three main portions: the pressurized helmet, the breathing bladder, and the tankage system in a backpack. The bladder and helmet were connected together to pump air out of the bladder and over the torso when the user breathed in, reducing the amount of pressure on the user's chest. The helmet ...
The equipment must supply breathing gas for all users for at least 15 minutes at a cabin altitude of 8,000 ft at a respiratory minute volume of 30 liters per minute, either by continuous flow or via a demand system, and must not cause a significant increase in oxygen content of the local environment.
The user respiratory interface is the delivery system by which the breathing apparatus guides the breathing gas flow to and from the user. Some form of facepiece, hood or helmet is usual, but for some medical interventions an invasive method may be necessary. Any given unit is a member of several types.
Respirators are protective breathing equipment, which protect the user from inhaling contaminants in the air, thus preserving the health of their respiratory tract. There are two main types of respirators. One type of respirator functions by filtering out chemicals and gases, or airborne particles, from the air breathed by the user. [5]
The semi-closed breathing circuit used the injected gas to circulate the gas in the helmet through a scrubber, providing a very low work of breathing in comparison with most other rebreathers which used the lungs of the diver to circulate gas in the loop. The Modell 1915 bubikopf helmet was designed for use with this system. The rebreather loop ...
breathing helmet 1. A breathing helmet is a rigid respiratory user interface covering the head that also provides head protection against impact and penetration. [11] A diving helmet is possibly the most familiar example. 2. In medical terminology, a breathing helmet is synonymous with a breathing hood, and need not have any rigid protective ...