Differential conductivity hemodynamic monitor
First Claim
1. An apparatus for quantitatively determining a fluid flow parameter of blood having a physical property flowing in an arterio-venous fistula into which first blood having a first initial value of said physical property is being inserted and from which second blood having a second initial value of said physical property is simultaneously being withdrawn, comprising:
- means for altering the value of the physical property of the first blood;
means for measuring the value of the physical property of the first blood after the value of the physical property is altered and before the first blood is inserted into the arterio-venous fistula;
means for measuring the value of the physical property of the second blood after it is withdrawn from the arterio-venous fistula; and
means for comparing the measured altered value of the physical property of the first blood with the measured value of the physical property of the second blood to quantitatively determine the fluid flow parameter of blood flowing in the arterio-venous fistula.
6 Assignments
0 Petitions
Accused Products
Abstract
A flow rate of a fluid flowing in a tube is quantitatively determined by altering the electrical conductivity of the fluid by injection of a bolus of saline. The electrical conductivity of the altered conductivity is measured over the time it takes the altered conductivity fluid to pass a conductivity measuring location. The measured conductivity is integrated over the time it takes to pass the conductivity measuring location. The integral is interpreted to determine the flow rate.
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Citations
12 Claims
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1. An apparatus for quantitatively determining a fluid flow parameter of blood having a physical property flowing in an arterio-venous fistula into which first blood having a first initial value of said physical property is being inserted and from which second blood having a second initial value of said physical property is simultaneously being withdrawn, comprising:
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means for altering the value of the physical property of the first blood; means for measuring the value of the physical property of the first blood after the value of the physical property is altered and before the first blood is inserted into the arterio-venous fistula; means for measuring the value of the physical property of the second blood after it is withdrawn from the arterio-venous fistula; and means for comparing the measured altered value of the physical property of the first blood with the measured value of the physical property of the second blood to quantitatively determine the fluid flow parameter of blood flowing in the arterio-venous fistula. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for quantitatively determining a fluid flow parameter of blood having a physical property flowing in an arterio-venous fistula into which first blood having a first initial value of said physical property is being inserted and from which second blood having a second initial value of said physical property is simultaneously being withdrawn, comprising:
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altering the value of the physical property of the first blood; measuring the value of the physical property of the first blood after the value of the physical property is altered and before the first blood is inserted into the arterio-venous fistula; measuring the value of the physical property of the second blood after it is withdrawn from the arterio-venous fistula; and comparing the measured altered value of the physical property of the first blood with the measured value of the physical property of the second blood to quantitatively determine the fluid flow parameter of the blood flowing in the arterio-venous fistula. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification