DEVICE FOR MONITORING FLUID STATUS
First Claim
Patent Images
1. A device, comprising:
- an exciter for outputting an excitation current waveform and impressing a current field between a pair of excitation current electrodes;
voltage sensing circuitry for sensing a voltage difference signal between a pair of voltage sense electrodes disposed in a patient'"'"'s blood and in the current field;
means for measuring the electrolyte concentration in the patient'"'"'s blood; and
,a controller interfaced to the voltage sensing circuitry which is programmed to estimate the patient'"'"'s hematocrit from the voltage difference signal and the measured electrolyte concentration.
0 Assignments
0 Petitions
Accused Products
Abstract
A technique for determining a patient'"'"'s hematocrit by an electrical impedance measurement is described. An implantable device may be configured to utilize the technique in order to assess a cardiac patient'"'"'s fluid status. In order to determine the hematocrit, the electrical impedance of the blood is measured and mapped by a mapping function to a corresponding hematocrit value.
-
Citations
20 Claims
-
1. A device, comprising:
-
an exciter for outputting an excitation current waveform and impressing a current field between a pair of excitation current electrodes; voltage sensing circuitry for sensing a voltage difference signal between a pair of voltage sense electrodes disposed in a patient'"'"'s blood and in the current field; means for measuring the electrolyte concentration in the patient'"'"'s blood; and
,a controller interfaced to the voltage sensing circuitry which is programmed to estimate the patient'"'"'s hematocrit from the voltage difference signal and the measured electrolyte concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for monitoring the fluid status of a patient, comprising:
-
outputting an excitation current waveform and impressing a current field between a pair of excitation current electrodes; sensing a voltage difference signal between a pair of voltage sense electrodes disposed in the patient'"'"'s blood and in the current field; measuring the electrolyte concentration in the patient'"'"'s blood; and
,estimating the patient'"'"'s hematocrit from the voltage difference signal and the measured electrolyte concentration. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification