Physiological monitoring electrode system
First Claim
1. A physiological monitoring electrode system for use with an ECG comprising:
- first and second electrode elements to be attached to a patient;
first electrically conducting means connecting said first electrode element to a first input of the ECG;
second electrically conducting means connecting said second electrode to a second input of the ECG;
a body tissue impedance simulating circuit connected to said first and second conducting means; and
third electrically conducting means connected from said body tissue impedance simulating circuit to a third input of the ECG, said body tissue impedance circuit providing an impedance between said third conducting means and at least one of said first and second conducting means to give the appearance that the third input of the ECG is connected to a third electrode on the patient, thereby permitting said first and second electrode elements to provide input information to the ECG from the patient that normally requires the use of a minimum of three separate electrodes and the associated leads.
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Accused Products
Abstract
A monitoring electrode system is provided in which just two electrodes and their corresponding lead lines may be utilized for a monitoring unit, such as an ECG, having three input terminals and normally requiring signals from three electrodes. To achieve such a two lead system, a body tissue impedance simulating circuit is included to provide an automatic reference line signal at the third input terminal. Protection against high voltages and radio frequency interference is provided by various circuits, such as a high voltage protection circuit, a low pass filter network or an RF choke filter network. In the preferred embodiment hereof, a pair of electrodes are provided with a connecting plug which engages a corresponding connector at the end of a cable extending from the ECG monitor. Preferably, the body tissue impedance simulating circuit and any protective circuits are located in the connector at the end of the ECG cable.
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Citations
12 Claims
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1. A physiological monitoring electrode system for use with an ECG comprising:
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first and second electrode elements to be attached to a patient; first electrically conducting means connecting said first electrode element to a first input of the ECG; second electrically conducting means connecting said second electrode to a second input of the ECG; a body tissue impedance simulating circuit connected to said first and second conducting means; and third electrically conducting means connected from said body tissue impedance simulating circuit to a third input of the ECG, said body tissue impedance circuit providing an impedance between said third conducting means and at least one of said first and second conducting means to give the appearance that the third input of the ECG is connected to a third electrode on the patient, thereby permitting said first and second electrode elements to provide input information to the ECG from the patient that normally requires the use of a minimum of three separate electrodes and the associated leads. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An ECG cable for use in a physiological electrode system and comprising:
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a first electrically conducting lead; a second electrically conducting lead; an ECG monitor connector for releasably securing one end of the ECG cable to an ECG with a first end of said first conducting lead to be electrically connected to a first ECG input and a first end of said second conducting lead to be electrically connected to a second ECG input; an ECG electrode connector to provide for the connection of the second end of said first conducting lead to a first physiological electrode element and for the connection of the second end of said second conducting lead to a second electrode element; a body tissue impedance simulating circuit connected to said first and second conducting leads; and a third electrically conducting lead to be connected from said body tissue impedance simulating circuit to a third ECG input, said body tissue impedance circuit providing an impedance between said third lead and at least one of said first and second leads to give the appearance that the third ECG input is connected to a third electrode on the patient, thereby permitting the obtaining of input information for the ECG from the first and second electrode elements that normally requires the use of a minimum of three separate electrodes. - View Dependent Claims (9, 10, 11, 12)
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Specification