| 摘要 |
A PEEP valve is disclosed for use in a respiratory circuit. A predetermined positive pressure differential between an inlet port (14) and an outlet port (16), in use, causes a sealing disc (40,50) to disengage from a valve seat (19) and allow flow of gas from the inlet port (14) to the outlet port (16). The sealing disc (40,50) includes at least one aperture (42,52) and there is provided a closure (44,54) of flexible material that occludes the aperture (42,52). The closure (44,54) is fixed to the sealing disc (40,50) such that a negative pressure differential between the inlet and outlet ports (14,16), in use, causes the closure (44,54) to hinge about a substantially linear fold that forms in the closure (44,54), thereby exposing the aperture (42,52) and allowing gas to flow from the outlet port (16) to the inlet port (14). |
