Method and apparatus for determining pressures associated...

A - Human Necessities – 61 – B

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A61B 5/0215 (2006.01)

Patent

CA 2270978

This invention is a non-invasive apparatus and method, which need not require a physician for use thereof, for obtaining quantitative determinations of left atrial pressure values. A balloon (24) is inserted by means of a catheter (22) into the esophagus and positioned adjacent the left atrium. The balloon (24) is gradually inflated. In accordance with the oscillometric principle, the mean balloon pressure is measured when the intensity of a sound wave, after its transmission through the balloon (24), is at a peak. This mean balloon pressure, after adjustment for the effect, if any, of heart weight, is indicative of approximate mean left atrial pressure. Mean left atrial pressure may be determined by adjusting for the effects of heart weight and intrapleural pressure on mean pressure at peak sound intensity by subtracting therefrom the balloon pressure at which balloon volume begins to increase greatly relative to the increase in balloon pressure.

Cette invention concerne un appareil et un procédé non invasifs ne nécessitant pas la présence d'un médecin pour l'utiliser, et qui sont capables de fournir des évaluations quantitatives des valeurs de pression de l'oreillette gauche. Selon le procédé on introduit, à l'aide d'un cathéter (22), un ballonnet (24) dans l'oesophage et on positionne le ballonnet (24) à proximité de l'oreillette gauch. On gonfle graduellement le ballonnet (24). On mesure par oscillométrie la pression moyenne du ballonnet lorsque l'intensité d'une onde sonore, après émission à travers le ballonnet (24), se situe à une crête. Cette pression moyenne du ballonnet après ajustement pour tenir compte le cas échéant du poids du coeur indique la pression moyenne approximative de l'oreillette gauche. On peut déterminer la pression moyenne de l'oreillette gauche en compensant les effets du poids du coeur et de la pression intrapleurale sur la pression moyenne (PM) à une intensité de crête de l'onde sonore, de laquelle (PM) on soustrait la pression du ballonnet à laquelle le volume du ballonnet commence à augmenter fortement par rapport à l'augmentation de la pression du ballonnet.

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