Patent ID: 7555335
Filing Date: 2009-06-30
Classification: A61B,A61N

Abstract:
1. A cardiac monitoring device for monitoring a heart, comprising: a housing; amplification circuitry provided in the housing, the amplification circuitry configured to have a first amplifier input and a second amplifier input, the first amplifier input having a first input impedance and the second amplifier input having a second input impedance different from the first input impedance; a first electrode arrangement coupled to the first amplifier input and suitable for coupling to the heart with a first electrode interface impedance; a second electrode arrangement coupled to the second amplifier input and suitable for coupling to the heart with a second electrode interface impedance; and a signal processor provided in the housing and coupled to the amplification circuitry, the signal processor configured to separate a cardiac source signal from another physiological source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance, the cardiac source signal having a first source impedance associated therewith, and the another physiological source signal having a second source impedance associated therewith different from the first source impedance; wherein the first electrode interface impedance is smaller than the first and second source impedances, and the second electrode interface impedance is smaller than the first and second source impedances.