Apparatus and method for driving a sensor in a ventilator...

A - Human Necessities – 61 – M

Patent

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A61M 16/00 (2006.01)

Patent

CA 2579080

A ventilator includes a sensor to monitor a characteristic associated with the delivery of gas to the patient, such as pressure. A sensor power supply (100, 130) is feeding a sensor in the form of a Wheatstone bridge. A first end (104) of the bridge is coupled to a first positive voltage source (112, 142) and a second end (116) is coupled to a second positive voltage source (118, 156, 180). A capacitor (120) is coupled to the second end of the bridge. A controller (50) controls the first and the second positive voltage sources so as to (a) disable the sensor by causing the first positive voltage source to provide substantially zero voltage to the first end of the Wheatstone bridge and by causing the second positive voltage source to provide a positive voltage to the second end of the capacitor, and to (b) enable the sensor by causing the first positive voltage source to provide a positive voltage to the first end of the Wheatstone bridge and by causing the second positive voltage source to provide a decreasing voltage to the second end of the capacitor.

L'invention concerne un ventilateur comprenant un capteur permettant de surveiller une caractéristique associée à l'administration de gaz à un patient, tel que la pression. Une alimentation de capteur (100, 130) alimente un capteur sous la forme d'un pont de Wheatstone. Une première extrémité (104) du pont est couplée à une première source de tension positive (112, 142) et une seconde extrémité (116) est couplée à une seconde source de tension positive (118, 156, 180). Un condensateur (120) est couplé à la seconde extrémité du pont. Une unité de commande (50) commande les première et seconde sources de tension positive de manière à (a) désactiver le capteur en contraignant la première source de tension positive de fournir une tension de sensiblement zéro à la première extrémité du pont de Wheatstone et en contraignant la seconde source de tension positive de fournir une tension positive à la seconde extrémité du condensateur et à (b) activer le capteur en contraignant la première source de tension positive de fournir une tension positive à la première extrémité du pont de Wheatstone et en contraignant la seconde source de tension positive de fournir une tension décroissante à la seconde extrémité du condensateur.

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