Apparatus and method for measuring drop size in an...

A - Human Necessities – 61 – M

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A61M 5/168 (2006.01) A61M 5/14 (2006.01)

Patent

CA 2429409

A capacitive-based apparatus (10) for measuring the volume of a fluid drop (30) passing through an intravenous drip chamber (12). The apparatus includes a capacitor (16) comprising two parallel plates (42) that are a fixed distance apart and are positioned such that the fluid flow path in the drip chamber is between them. The fluid drop moving through the drip chamber between the plates causes the capacitance of the plates to change. This change in capacitance is measured and from it, the volume of the drop is calculated. The volumes of a series of drops are integrated to provide a measured rate of flow through the drip chamber. This measured rate of flow is compared to the programmed rate of flow and the difference is used to adjust a flow control device to obtain the desired rate of flow.

L'invention concerne un appareil basé sur l'équilibre de condensation afin de mesurer le volume d'un fluide passant au goutte à goutte dans une chambre compte-gouttes intraveineuse. Cet appareil est doté d'un condensateur pourvu de deux plaques parallèles espacées d'une distance fixe et placées de manière à ce que le chemin de passage du fluide dans la chambre compte-gouttes se trouve entre elles. Les gouttes de fluide passent par la chambre compte-gouttes entre les plaques et entraînent une modification de l'équilibre de capacité des plaques. On mesure cette modification de l'équilibre de capacité et à partir de cela, on peut calculer le volume de gouttes. Les volumes d'une série de gouttes sont intégrés afin de fournir un débit de passage mesuré par la chambre compte-gouttes. On compare ensuite ce débit de passage mesuré au débit programmé de débit de passage et la différence sert à ajuster un dispositif de contrôle du passage, en vue d'obtenir le débit souhaité de passage. Le passage mesuré est également affiché.

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