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Halcyon PVR-BASC semi-closed rebreather - underside, showing gas supply connectors, hoses and manual valves, and loop drain pump Halcyon PVR-BASC semi-closed rebreather underside, showing bolts for connection to backplate
A bag valve mask (BVM), sometimes known by the proprietary name Ambu bag or generically as a manual resuscitator or "self-inflating bag", is a hand-held device commonly used to provide positive pressure ventilation to patients who are not breathing or not breathing adequately. The device is a required part of resuscitation kits for trained ...
A resuscitator is a device using positive pressure to inflate the lungs of an unconscious person who is not breathing, in order to keep them oxygenated and alive. [citation needed] There are three basic types: a manual version (also known as a bag valve mask) consisting of a mask and a large hand-squeezed plastic bulb using ambient air, or with supplemental oxygen from a high-pressure tank.
The device must have a pressure relief valve that opens at 60cm of water pressure to avoid over ventilation and trauma to the lungs. The (FROPVD) is contraindicated in adult patients with potential chest trauma and all children. Note: ( In cases with an apneic patient the best results will be achieved using the Two person bag-valve-mask technique.)
If the breathing gas supply is depleted, the dose of fresh breathing gas decreases until the breathing supply is used up. The diver will notice the decreasing volume of gas available which signals the need to switch to an independent open-circuit bailout system, which is integrated into the rebreather mouthpiece as a bailout valve, or to ...
Rebreather systems can be closed or semi-closed circuit, have a pendulum or loop flow path configuration, and the gas can be circulated by the breathing of the user through non-return valves, (almost all self-contained units), by the energy of the injected fresh gas, (Dräger Modell 1915 "Bubikopf", DM20 and DM40, [16] and US Navy Mk V helium ...
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