Patent ID: 7474922
Filing Date: 2009-01-06
Classification: A61N

Abstract:
1. A pacing system for pacing multiple chambers of the heart and sensing signals from the myocardium of multiple chambers of the heart which will allow the verification of a cardiac evoked response resulting from a delivered charge to the heart tissue comprising: a preamplifier system circuit having at least two inputs for sensing signals to be picked up by at least two electrodes adapted to pick up the sensing signals, the preamplifier further comprises a) a DC coupled buffer amplifier first stage, comprising at least one buffer amplifier for each of the at least two electrode inputs, b) a switch matrix following the buffer amplifiers allowing sensing of the differential between any two of the at least two electrode inputs, c) a next stage of differential amplifiers providing gain to either the differential between any two electrode inputs or one input to ground, and d) a next stage filter stage.