Patent ID: 6463322
Filing Date: 2002-10-08
Classification: A61B

Abstract:
A medical signal monitoring apparatus including a combination referential and differential amplifier circuit, comprising:(a) a plurality of electrode inputs adapted to be coupled to electrodes for detecting electrophysiologic signals of a subject, wherein at least one of the plurality of electrode inputs is a reference electrode input; (b) a plurality of medical signal amplifiers, each of the medical signal amplifiers having a first amplifier input, a second amplifier input, and an amplifier output; and (c) switching means for selectively coupling each of the plurality of electrode inputs to each of the first and second amplifier inputs of the plurality of medical signal amplifiers, such that the amplifier output of a medical signal amplifier with the first and second amplifier inputs thereof coupled to different electrode inputs neither of which is a reference electrode input produces a differential amplifier signal output, and such that the amplifier output of a medical signal amplifier with the first and second amplifier inputs thereof coupled to different electrode inputs one of which is the reference electrode input produces a referential signal output.