Patent ID: 8626284
Filing Date: 2014-01-07
Classification: A61B,A61N

Abstract:
1. An intracardiac defibrillation catheter system comprising a defibrillation catheter having electrodes and being operable to be inserted into a cardiac cavity for carrying out defibrillation, a power source device for applying a direct current voltage to the electrodes of the defibrillation catheter, and an electrocardiograph, wherein the defibrillation catheter comprises: an insulated tube member, a first electrode group comprising a plurality of said electrodes, which are ring-like, and which are installed in a distal region of the tube member, a second electrode group comprising a plurality of said electrodes, which are ring-like, and which are installed on the tube member towards proximal direction from the first electrode group, a first lead wire group comprising a plurality of lead wires whose distal ends are connected to the respective electrodes making up the first electrode group, and a second lead wire group comprising a plurality of lead wires whose distal ends are connected to the respective electrodes making up the second electrode group, wherein the power source device comprises: a DC power source unit, a catheter-connected connector which is a connector for the power source device, and is connected to proximal sides of the first lead wire group and the second lead wire group of the defibrillation catheter, an electrocardiograph-connected connector which is connected to an input terminal of the electrocardiograph, an external switch which is an input means; an arithmetic processing unit which controls the DC power source unit based on input of the external switch, the arithmetic processing unit has an output circuit for outputting a direct current voltage from the DC power source unit, and a changeover unit comprising a changeover switch of two contacts per circuit which includes a common contact, a first contact and a second contact, in which the catheter-connected connector is connected to the common contact of the changeover unit, the electrocardiograph-connected connector is connected to the first contact of the changeover unit, and the arithmetic processing unit is connected to the second contact of the changeover unit, wherein when a cardiac potential is measured by said electrodes of the defibrillation catheter, the common contact of the changeover unit is connected to the first contact in the changeover unit by the arithmetic processing unit based on input of the external switch, and cardiac potential information from the defibrillation catheter is inputted into the electrocardiograph via the catheter-connected connector, the changeover unit and the electrocardiograph-connected connector of the power source device, and during defibrillation, the common contact of the changeover unit is changed over to the second contact of the changeover unit by the arithmetic processing unit of the power source device such that voltages different in polarity from each other are applied to the first electrode group and the second electrode group of the defibrillation catheter, and each polarity is reversed in sign over time, via the output circuit of the arithmetic processing unit, the changeover unit and the catheter-connected connector from the DC power source unit.