| 摘要 |
A heat and moisture exchanger and filter for inclusion in an air line used in anaesthesia or patient ventilation comprises a housing having inlet and output ports (1) & (2), the interior (16) of the housing being of greater cross sectional area than either of said ports, and a heat and moisture exchange element (8) spanning the interior of the housing between the ports, said element (8) being in the form of a sheet of water-activated, hydrophilic polyurethane reticulated foam untreated with any hygroscopic or hydrophilic agent, the housing and element being so arranged that air flow is distributed uniformly of the surface of the element. The housing also encloses a filter element (7), of electrostatically charged polymer fibres able to retain bacteria, in close contact with element (8). In making element (8), a block of foam is cast in a polypropylene or polythene mould, sliced into sheets and die-cut to shape. <IMAGE> |
