Intracardial impedance measuring arrangement

US7395114B2 · kind B2 · utility

Assignee

• BIOTRONIK AG · CH

Inventors

• Gerald Czygan · Berlin, DE
• Michael Lippert · Ansbach, DE

Key dates

• Filing date: Aug 20, 2004
• Grant date: Jul 1, 2008
• Expiry date: Apr 1, 2026

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/7285
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Certain embodiments of the present invention disclose an implant with electrode line connections for the connection of intracardial and/or epicardial electrode lines, wherein the electrode line connections have together at least three electrical contacts of which at least one is associated with a right-ventricular electrode and another is associated with a left-ventricular electrode, an impedance determining unit (IMP) which has a current or voltage source (I) and a measuring device (U) for a corresponding voltage or current measurement operation, which is connected to the electrical contacts and possibly a housing electrode of the implant, in such a way as to afford a tri- or quadrupolar impedance measuring arrangement which includes exclusively ventricular electrodes and in addition possibly the housing electrode, wherein the impedance measuring arrangement produces impedance measurement values and is connected to an evaluation unit (EVAL) and the evaluation unit (EVAL) is adapted to ascertain a minimum of the impedance measurement values within a first time window (defined relative to a ventricular event) as end-diastolic impedance (EDZ) and a maximum of the impedance measuremen…