Method and Device for Determining Flow in a Blood Vessel
First Claim
1. Method for determining the flow in a blood vessel, comprising ofa) determining the relation between the average shear rate and the electrical impedance of flowing blood,b) measuring the electrical impedance in the blood in a cross-section of the blood vessel,c) determining the average shear rate from this relation and the measured electrical impedance,d) determining the size of the cross-section of the blood vessel,e) selecting a theoretical relative flow distribution over the blood vessel cross-section,f) determining the average flow speed on the basis of the shear rate and the relative flow distribution, andg) determining the flow volume from the determined average flow speed and the cross-section.
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Abstract
The invention relates to a method and device for determining the flow in a blood vessel, comprising the 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.
73 Citations
16 Claims
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1. Method for determining the flow in a blood vessel, comprising of
a) determining the relation between the average shear rate and the electrical impedance of flowing blood, b) measuring the electrical impedance in the blood in a cross-section of the blood vessel, c) determining the average shear rate from this relation and the measured electrical impedance, d) determining the size of the cross-section of the blood vessel, e) selecting a theoretical relative flow distribution over the blood vessel cross-section, f) determining the average flow speed on the basis of the shear rate and the relative flow distribution, and g) determining the flow volume from the determined average flow speed and the cross-section.
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14. Device for determining the flow in a blood vessel, comprising
means for measuring the electrical impedance in the blood in a cross-section of a blood vessel, means for determining the size of the blood vessel cross-section, and processing means, comprising memory means having stored therein a determined relation between the shear rate and the electrical impedance of flowing blood and for storing a theoretical relative flow distribution over the blood vessel cross-section, and computing means for determining the shear rate from the stored relation and the measured electrical impedance, for determining the average flow speed on the basis of the shear rate and the stored relative flow distribution, and for determining the flow volume from the determined average flow speed and the cross-section.
Specification