| 摘要 |
Breathing apparatus includes a frame (2) and a flexible hood (1) extending over the head and frame with the frame spacing the hood from the front of the face. The hood (1) is made of two layers (12 and 13) joined to form a gas channel (16) extending to a chamber (19) above the forehead and having gas outlet holes (20) by which gas flows out into the hood. An outlet chamber (21) is formed in the region of the mouth through which gas is removed to a recirculating helium and oxygen gas supply (3). |
