The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2011
Filed:
Jun. 29, 2006
Hans Matthiessen, Bad Schwartau, DE;
Dieter Weismann, Gross Grönau, DE;
Jianhua LI, Lübeck, DE;
Yvo Gärber, Lübeck, DE;
Arndt Pöcher, Bad Schwartau, DE;
Markus Steeger, Lübeck, DE;
Hans Matthiessen, Bad Schwartau, DE;
Dieter Weismann, Gross Grönau, DE;
Jianhua Li, Lübeck, DE;
Yvo Gärber, Lübeck, DE;
Arndt Pöcher, Bad Schwartau, DE;
Markus Steeger, Lübeck, DE;
Dräger Medical GmbH, Lübeck, DE;
Abstract
An electroimpedance tomograph with a plurality of electrodes () is provided, which can be placed on the body of a patient and are connected via a selector switch () with a control and evaluating unit (). The control and evaluating unit () cooperates with the selector switch () such that two electrodes each are supplied with an alternating current from an AC power source () and the detected analog voltage signals of the other electrodes are processed in order to reconstruct therefrom the impedance distribution of the body in the plane of the electrodes, wherein a symmetrical AC power source is used to reduce common-mode signals. To further suppress interferences due to common-mode signals, provisions are made for the control and evaluating unit () to be set up, furthermore, for detuning the common-mode signal of the alternating current on the body against the ground by means of a common-mode signal measuring electrode () and, based on this, the symmetry of the symmetrical AC power source such that the common-mode signal on the body is minimized, and the corresponding detuning parameters are stored for each electrode pair.