Combination referential and differential amplifier for medical signal monitoring
First Claim
1. 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.
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Abstract
A combination referential and differential amplifier circuit for a medical signal monitoring system includes a plurality of electrode inputs, including at least one reference electrode input, a plurality of medical signal amplifiers, and switching means for selectively coupling each of the plurality of electrode inputs to each of the inputs of the plurality of medical signal amplifiers. Each electrode input may be selectively coupled to several amplifier inputs. The output of a medical signal amplifier with the amplifier inputs thereof coupled to electrode inputs, neither of which is a reference electrode input, produces a differential amplifier signal output. A medical signal amplifier with the inputs thereof coupled to electrode inputs, one of which is the reference electrode input, produces a referential signal output. Thus, a combination of differential and referential electrophysiologic signal channels may be provided.
29 Citations
10 Claims
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1. A medical signal monitoring apparatus including a combination referential and differential amplifier circuit, comprising:
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(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. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a medical signal monitoring apparatus to obtain a selectable combination of referential and differential medical signals, comprising the steps of:
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(a) attaching a plurality of electrodes to a subject for detecting electrophysiologic signals of the subject, wherein at least one of the plurality of electrodes attached to the subject is a reference electrode;
(b) providing 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) selectively coupling each of the plurality of electrodes to selected ones 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 electrodes neither of which is a reference electrode 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 electrodes one of which is the reference electrode produces a referential signal output. - View Dependent Claims (7, 8, 9, 10)
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Specification