| 摘要 |
A respiratory humidifier has an outer flexible, gas-tight bag 10 containing water 12 and an exothermic chemical heater 16. A sandwich of an open-celled foam 36 and a vapour-permeable/water impermeable layer 30 is secured on the inside of the bag by compressing and welding the sandwich to the wall of the bag to form a labyrinth path for gas through the foam. Water vapour in the bag permeates the foam so that respiratory gas is humidified without contacting the water. |
