Abstract: An electronic, miniaturized, pocket-size device having a multiplicity of tri-electrode sets (note FIGS. 3 and 6A) for monitoring and storing EKG or EEG signals, one being positive and the other negative, with the third being a possible signal opposite to the signal received sent in the opposite direction (to the electrode), lessening background noise. Each is connected to one or more amplifiers joined in a central amplifier which breaks up the signals into two separate, related signals, one being the difference in the bias voltages of the positive and negative voltages and the second being the amplified difference of the signals. The first is sent to a voltage sensitive detector, which sends a signal out when this difference becomes sufficient, the detector being set for triggering when an electrode becomes detached or otherwise defective, as in even an abnormal EKG or EEG the voltages will not be greatly different.

Abstract: An electronic miniaturized, pocket-sized device for monitoring EKG and/or EEG signals and storing such signals. First, second and third electrodes are adapted for connection to a human body and first and second voltage amplifiers are electrically connected to respective ones of the first and second electrodes for producing first and second output signals having low noise content. A third amplifier is connected to both the first and second voltage amplifier for producing two output signals, one being the difference in voltage of the two voltage amplifiers as amplified and the second output being the difference of the bias voltages of the first and second voltage amplifiers. A lead fail detector includes voltage sensing device electrically connected to the second output of the third voltage amplifier and outputting a signal only when the difference of the bias voltages of the electrodes through the respective first and second voltage amplifiers is above a preselected level.

Abstract: A self-powered life monitor in a pocket-size, portable container including a casing with electrode probes mounted on the casing which are capable of piercing the skin to rest in subcutaneous tissue. The monitor further includes an amplifier electrically connected to the electrode probes and to a "life" indicator. The monitor is used by placing the electrode probes at different positions in an area of the human body where electrical potential is indicative of life activity, such as the areas of the heart or brain. The amplifiers enhance the difference between the electrical potentials measured by the probes, and the indicator indicates the existence and strength of the electrical potential and hence the presence or absence of life. For brain activity detection, a first embodiment (note particularly FIGS. 2 and 7) has supplemental, swing-out, pivoting electrodes, while a second embodiment (FIGS. 8 and 9) has supplemental, spring-out electrodes.