Simple oxygen-failure safety device.

Recent correspondence in the British Medical Journall-4 has discussed the need for oxygen-failure devices and the philosophy of their design, so we shall not repeat this discussion here. Briefly, however, we think that very occasional oxygen failures are inevitable, during both anaesthesia and artificial ventilation with oxygen. Because the danger is so remote any safety device that is to gain the wide acceptance that is essential if it is to be of any value must be both cheap and reliable. Oxygen failures