Patent ID: 6188926
Filing Date: 2001-02-13
Classification: A61N

Abstract:
A cardiac pacemaker comprising:pacing circuitry for emitting pacing pulses at an adjustable rate over a plurality of cardiac cycles;a memory for storing said rate for a plurality of most recent cardiac cycles free of electromagnetic interference;an electromagnetic interference detector which detects electromagnetic interference;backup rate determining circuitry for determining, upon detection of electromagnetic interference by said electromagnetic interference detector, a backup rate from said at least one rate stored in said memory;a cardiac cycle determining and counting unit, connected to said memory and to said backup rate detecting circuitry, for supplying a predetermined number of said plurality of most recent cardiac cycles to said backup rate determining circuitry, and wherein said backup rate determining circuitry determines said backup rate from said predetermined number of most recent cardiac cycles; anda control unit, supplied with said backup rate from said backup rate determining circuitry, for controlling said pacing circuitry to set said rate equal to said backup rate.