US 11,850,032 B2
Method and system for monitoring internal electrical impedance of a biological object
Michael Shochat, Matan (IL); and Schmuel Gummer, Tel Aviv (IL)
Assigned to CARDIOSET LTD., Matan (IL)
Filed by CARDIOSET LTD, Matan (IL)
Filed on Dec. 6, 2021, as Appl. No. 17/457,907.
Application 17/457,907 is a continuation of application No. 16/872,427, filed on May 12, 2020, granted, now 11,191,442, issued on Dec. 7, 2021.
Application 16/872,427 is a continuation of application No. 15/539,680, abandoned, previously published as PCT/IL2015/050048, filed on Jan. 14, 2015.
Prior Publication US 2022/0233088 A1, Jul. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/053 (2021.01); A61B 5/0535 (2021.01); A61B 5/276 (2021.01); A61B 5/00 (2006.01); A61B 5/0537 (2021.01); A61B 5/085 (2006.01)
CPC A61B 5/053 (2013.01) [A61B 5/0535 (2013.01); A61B 5/276 (2021.01); A61B 5/0537 (2013.01); A61B 5/085 (2013.01); A61B 5/4878 (2013.01); A61B 5/7221 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for multi-electrode monitoring of an internal electrical impedance of a biological object, the method comprising the steps of:
i) placing a first array of electrodes on one side of the biological object and a second array of electrodes on an opposite side of the biological object, wherein each of said arrays comprises at least three spaced apart electrodes;
ii) performing a plurality of measurements on different pairs of electrodes that comprise two or more opposite sides electrode pairs, wherein each of said measurements is performed on a different pair of said electrodes by applying an alternating electrical current between the electrodes of the pair and obtaining voltage signals representative of a voltage drop thereon; wherein each opposite sides electrode pair comprises an electrode of the first array and an electrode of the second array;
iii) calculating, for each electrode (of the different pairs of electrodes), values of impedance(s) indicative of sums of electrode impedance and a skin-electrode contact impedance to provide multiple values;
wherein said calculating comprises using a system of linear equations;
iv) comparing said calculated sums to each other, wherein a difference between sums, found by the comparing, that exceeds a predetermined threshold value is representative of a potential failure in at least one of said electrodes related to the sums;
v) calculating an internal electrical impedance value of the biological object based on (a) measurements of at least two opposite sides electrode pairs of the two or more opposite sides electrode pairs, and (b) calculated sums for each electrode of the at least two opposite sides electrode pairs; and
wherein the method comprising performing measurement sessions by repeating steps ii)-v) when the result of the comparison exceeds the predetermined threshold value.