Patent
Coupling circuit with driven guard
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TLDR
In this article, the effects of common mode potentials on the patient's body are minimized without requiring any patient electrodes other than those acting as signal sources, by using an operational amplifier to drive the floating ground toward the common modes on the patients body.Abstract:
In signal measurement circuits which are referred to a floating ground and which derive their input signals from electrodes attached to a patient's body, the effects of common mode potentials on the patient's body are minimized without requiring any patient electrodes other than those acting as signal sources, by using an operational amplifier to drive the floating ground toward the common mode potential on the patient's body. This process is accomplished without significantly degrading the isolation impedance between the measurement circuits and true ground. The patient is protected from hazardous electrical shock by incorporating a current limiting impedance in the amplifier circuit.read more
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References
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Patent
Electrocardiograph lead distribution and contact testing apparatus
TL;DR: In this article, an electrocardiograph apparatus including a recorder electrically connected by a patient cable to a number of electrical terminals in a distribution head so that each terminal forms a contact point for a series of lead wires each adapted to receive electrical impulses from a selected location of the patient's body.
Patent
Electrically isolated signal path means for a physiological monitor
TL;DR: In this article, a circuit for providing electrical isolation between a patient and physiological monitoring apparatus comprising an amplifier, having applied to the input thereof a physiological signal from the patient, and a first circuit branch including an isolation transformer connected between a modulator and a demodulator for connecting a d.c. voltage source of relatively low magnitude to the amplifier.
Patent
Circuit arrangement for the processing of physiological measuring signals
TL;DR: In this paper, a calibrated impulse generator is connected to the inputs of all input amplifiers so as to increase the input voltages of the inputs, each differential amplifier including an additional calibrating input to which there is transmissible a calibrating signal from the calibrating impulse generator.
Patent
Multiple channel electrocardiograph
TL;DR: In this article, a multiple channel electrocardiograph is presented, where three body voltage measurements are simultaneously read-out on a moving chart, and a selectively operable circuit for automatically attentuating chest voltage measurements taken in vicinity of the heart.
Patent
Method and apparatus for bio-electrical signal measurement
TL;DR: In this paper, an isolated front-end amplifying system enclosed by a floating shield connected to one of the patient leads was used to provide a high common mode rejection ratio and good isolation, and transformer or other suitable isolation coupling furnishes output signals from the isolated front end to the instrumentation processing circuitry.