Moisture indicator for heat and moisture exchange devices

A - Human Necessities – 61 – M

Patent

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A61M 16/16 (2006.01) G01N 31/22 (2006.01) G01N 33/497 (2006.01)

Patent

CA 2703075

There is provided a moisture indicator for a heat and moisture exchange (HME) device that uses a pre-colorant and an activator applied to an inner surface of the HME device. The colorant undergoes a color change of Delta E(.DELTA.E) of equal to or greater than 3 units upon exposure to moisture but not upon exposure to high humidity. The colorant is visually obvious to the unaided human eye under normal light conditions through the body of the device. The HME device with the visual indicator for moisture can indicate to the care-giver that it is time to change the HME device.

L'invention porte sur un indicateur d'humidité pour un dispositif d'échange de chaleur et d'humidité (HME) qui utilise un pré-colorant et un activateur appliqués à une surface interne du dispositif HME. Le colorant subit un changement de couleur de Delta E (?E) égal ou supérieur à 3 unités lors d'une exposition à l'humidité mais pas lors d'une exposition à une humidité élevée. Le colorant est visuellement évident à l'il nu dans des conditions de lumière normales à travers le corps du dispositif. Le dispositif HME avec l'indicateur visuel d'humidité peut indiquer à la personne soignante qu'il est temps de changer le dispositif HME.

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