Flowrestricted, oxygenpowered ventilation device To use the device, manually trigger it until chest rise is noted and then release. Wait five seconds before repeating. 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 .Bag valve mask A bag valve mask, sometimes known by the proprietary name Ambu bag or generically as a manual resuscitator or selfinflating bag, is a handheld 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 professionals in outofhospital settings and is also frequently used in hospitals as part of standard equipment found on a crash cart, in emergency rooms or otherBuiltin breathing system A builtin breathing system is a source of breathing gas installed in a confined space where an alternative to the ambient gas may be required for medical treatment, emergency use, or to minimise a hazard. They are found in diving chambers, hyperbaric treatment chambers, and submarines.. The use in hyperbaric treatment chambers is usually to supply an oxygen rich treatment gas which if used as .Snorkel swimming The device resembles a fullface diving mask incorporating two breathing tubes topped with valves projecting above the surface for inhalation and exhalation purposes. On 11 July 1944, he obtains US design patent 138,286 for a simpler version of this mask with a flutter valve at the bottom and a single breathing tube with a ball valve at the top.Diving mask There are two basic categories of diving mask: The half mask covers the eyes and nose, and the full face mask covers eyes, nose and mouth, and therefore includes a part of the breathing apparatus. The half mask is described here. : 417. Diving masks may have a single, durable, tempered glass faceplate, or two lenses in front of the eyes. These may be supported by a relatively rigid plastic or .