Method and device for calculating dialysis efficiency

A - Human Necessities – 61 – M

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A61M 1/14 (2006.01) A61M 1/16 (2006.01) G01N 33/487 (2006.01)

Patent

CA 2292717

A method and apparatus for calculating the mass of a composition in a fluid volume or efficiency of exchange of said composition with an exchange fluid, especially urea in the body of a dialysis patient. Calculations are based on total mass of urea in the body. The concentration c d of urea in the effluent dialysate is measured, and the total removed mass U of urea is calculated by integrating the product of the urea concentration c d and the dialysate flow Q d. The momentary relative efficiency of the removal (K/V) is determined essentially by calculating the slope of the logarithm of the concentration curve and the momentary mass is determined therefrom. Then, the pre-treatment mass of urea in the body can be determined very accurately. Moreover, the momentary relative efficiency in any point is determined by using the removed urea U. The dialysis dose is calculated by integrating the momentary efficiencies.

L'invention concerne un procédé et un appareil permettant de calculer la masse d'une composition d'un volume de fluide ou le rendement d'échange de cette composition avec un fluide d'échange, notamment l'urée dans l'organisme d'un patient dialysé. Les calculs sont basés sur une masse totale d'urée dans l'organisme. On calcule la concentration d'urée Cd dans le dialysat effluent. Ensuite, on calcule la masse d'urée U totalement extraite en intégrant le produit de la concentration d'urée Cd et du débit du dialysat Qd. On détermine le rendement relatif momentané de l'extraction (K/V) essentiellement en calculant la pente du logarithme de la courbe de concentration, puis en déterminant la masse momentanée à partir de ce résultat. Cela permet de déterminer avec une grande précision la masse d'urée dans l'organisme avant traitement. En outre, on détermine l'efficacité relative momentanée en un point quelconque à l'aide de l'urée U extraite. Enfin, on calcule la dose de dialyse par l'intégration des rendements momentanés.

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