A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
A62B 7/14 (2006.01)
Patent
CA 2460462
The invention relates to a method of regulating the flow of additional oxygen coming from a source to an inlet in a respirator mask which is fitted with an inlet for ambient dilution air. The inhaled instantaneous inspiratory volume flow at ambient conditions is measured in real time (directly or using the measurement for the flow of dilution air inhaled in the mask, taking account of the additional oxygen). Moreover, the ambient pressure is also measured. The ambient pressure is subsequently used to determine the minimum oxygen content to be produced throughout the entire inhalation period in order to comply with the relevant respiratory standard. The instantaneous flow of additional oxygen is controlled in such a way as to meet the minimum requirements of the relevant standards with a margin of safety which is generally of the order of several percent.
Le procédé est destiné à réguler le débit d'oxygène additionnel provenant d'une source vers une admission dans un masque respiratoire muni d'une entrée d'air ambiant de dilution. On mesure en temps réel le débit inspiratoire volumique instantané inhalé ramené aux conditions ambiantes (directement ou à partir de la mesure du débit d'air de dilution inhalé dans le masque, en tenant compte de l'oxygène additionnel), et on mesure la pression ambiante. A partir de la pression ambiante on détermine la teneur minimale en oxygène à réaliser sur l'ensemble de l'inhalation pour respecter la norme respiratoire, et on commande le débit instantané d'oxygène additionnel de façon à remplir les exigences minimales des normes avec une marge de sécurité qui sera généralement de quelques pour cent.
Intertechnique
Robic
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