Patent ID: 7769453

Claim:
An implantable battery operated electrostimulation device ( 10 ), for stimulating a heart comprising: a telemetry unit ( 11 ) for wireless data transmission between said implantable battery operated electrostimulation device ( 10 ) and an external device ( 21 ); a control unit ( 15 ), which is connected to said telemetry unit ( 11 ) and configured to trigger said wireless data transmission; a battery ( 13 ) to supply power for electrical components of said implantable battery operated electrostimulation device including said telemetry unit and said control unit; a self-test unit ( 17 ), configured to register a functional state of said implantable battery operated electrostimulation device and independently detect acute or imminent malfunctions of said implantable battery operated electrostimulation device; wherein said self-test unit ( 17 ) is connected to said control unit and is configured to automatically trigger said wireless data transmission through said telemetry unit to an external device ( 21 ) without receipt of an interrogation request from said external device ( 21 ) wherein said wireless data transmission comprises data on said functional state of said implantable battery operated electrostimulation device if said acute or imminent malfunctions are detected; and, wherein said self-test unit comprises a battery monitoring unit ( 12 ), configured to register an exhaustion state of said battery and, in case of a final exhaustion of said battery to occur soon; trigger said wireless data transmission comprising data on said exhaustion state of said battery directly or via said control unit; wherein said battery monitoring unit or said control unit is configured to detect a state of battery exhaustion, while a remaining residual charge of said battery ( 13 ) is sufficient so that said telemet unit automatically transmits at least one further message comprising information about said battery exhaustion to said external device ( 21 ) and wherein said battery monitoring unit or said control unit does not command said telemetry unit to transmit said at least one further message if said residual charge of said battery ( 13 ) is insufficient to transmit said at least one further message.