Method and device for determining flow in a blood vessel

Details Method and device for determining flow in a blood vessel Method and device for determining flow in a blood vessel

A - Human Necessities

61

B

A61B 5/027 (2006.01) A61B 5/053 (2006.01)

Patent

CA 2622277

The invention relates to a method and device for determining the flow in a blood vessel, comprising of determining the relation between the shear rate and the impedance of flowing blood, measuring the impedance in the blood in a cross-section of the blood vessel, determining the shear rate from this relation and the measured impedance, determining the size of the cross-section of the blood vessel, selecting a theoretical relative flow distribution over the blood vessel cross-section, determining the average flow speed on the basis of the average shear rate and the relative flow distribution, and determining the flow volume from the determined average flow speed and the cross-section.

L'invention concerne un procédé et un dispositif permettant de déterminer l'écoulement dans un vaisseau sanguin. Le procédé comporte les étapes consistant à: déterminer la relation entre la vitesse de cisaillement et l'impédance de l'écoulement sanguin, mesurer l'impédance dans le sang en une section transversale du vaisseau sanguin, déterminer la vitesse de cisaillement à partir de cette relation et de l'impédance mesurée, déterminer la taille de la section transversale du vaisseau sanguin, sélectionner une répartition d'écoulement relative théorique par rapport à la section transversale du vaisseau sanguin, déterminer la vitesse moyenne d'écoulement en fonction de la vitesse moyenne de cisaillement et de la répartition d'écoulement relative, et déterminer le volume d'écoulement à partir de la vitesse moyenne d'écoulement et de la section transversale.

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