US 12,402,818 B2
Suppressing echo effects on electrodes when measuring bioelectric signals
Ulrich Batzer, Spardorf (DE); and Matthias Brumhard, Erlangen (DE)
Assigned to Siemens Healthineers AG, Forchheim (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Dec. 10, 2020, as Appl. No. 17/117,450.
Claims priority of application No. 19218075 (EP), filed on Dec. 19, 2019.
Prior Publication US 2021/0186401 A1, Jun. 24, 2021
Int. Cl. A61B 5/25 (2021.01); A61B 5/00 (2006.01); A61B 5/30 (2021.01); A61B 5/305 (2021.01); A61B 5/308 (2021.01); A61B 5/31 (2021.01); A61B 5/313 (2021.01); A61B 5/318 (2021.01); A61B 5/369 (2021.01); A61B 5/389 (2021.01)
CPC A61B 5/25 (2021.01) [A61B 5/30 (2021.01); A61B 5/305 (2021.01); A61B 5/72 (2013.01); A61B 5/7203 (2013.01); A61B 5/7225 (2013.01); A61B 5/725 (2013.01); A61B 5/7278 (2013.01); A61B 5/308 (2021.01); A61B 5/31 (2021.01); A61B 5/313 (2021.01); A61B 5/318 (2021.01); A61B 5/369 (2021.01); A61B 5/389 (2021.01); A61B 5/7221 (2013.01); A61B 2562/182 (2013.01); A61B 2562/222 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An interference signal measuring facility for a differential voltage measuring system including a signal measuring circuit for measuring bioelectric signals with a number of useful signal paths, each of the useful signal paths respectively including a sensor electrode, the interference signal measuring facility comprising:
a plurality of additional sensor leads, each additional sensor lead of the plurality of additional sensor leads corresponding with a respective sensor electrode and electrically connected to a ground connection of a supply lead of the respective sensor electrode; and
a plurality of measuring amplifier circuits, each measuring amplifier circuit of the plurality of measuring amplifier circuits
respectively corresponding to each respective sensor electrode,
including a first input terminal electrically connected to a shield of a respective supply lead of a respective sensor electrode via an electrical resistor and a second input terminal electrically connected to a common ground connection, wherein the second input terminal is not connected to the shield of the respective supply lead except for internal connections of the respective measuring amplifier circuit, and
configured to
detect a change in electric potential occurring on the respective sensor lead, and
determine an electrode reference interference signal from the detected change in electric potential.