Patent ID: 7261697
Filing Date: 2007-08-28
Classification: A61B

Abstract:
1. An apparatus for determining stroke volume by bioimpedance from a patient's brachial artery, comprising: two or more spaced apart alternating current flow electrodes positioned on the patient's arm proximate the brachial artery; two or more spaced apart voltage sensing electrodes positioned on the patient's arm proximate the brachial artery, the voltage sensing electrodes being positioned between the alternating current flow electrodes; an alternating current source electrically connected to the alternating current flow electrodes, a voltmeter electrically connected to the voltage sensing electrodes; a data input device; a processing unit in communication with the data input device, the alternating current source, alternating current flow electrodes, the voltmeter, and voltage sensing electrodes, the processing unit capable of using data from the data input device and voltage sensing electrodes to calculate the stroke volume of the patient; wherein the processing unit uses the equation: wherein V and wherein the stroke volume equation is: