Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-01-24
1998-08-11
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 104
Patent
active
057921857
ABSTRACT:
An improved method and system to be utilized with combination defibrillation-heart monitoring equipment and having the ability to distinguish between defibrillation electrodes and monitoring electrodes in an electric circuit electrically connecting combination defibrillation-heart monitoring equipment to a patient. The objects of the method and system are achieved as is now described. At least one resistive element is placed in series with each monitoring electrode. The impedance of the resistive element is chosen such that the impedance is greater than the typical impedance that could be measured between a pair of accurately placed and properly prepared defibrillation electrodes. The resulting series resistive element-monitoring electrode combination is then utilized to distinguish between monitoring electrodes and defibrillation electrodes in an electric circuit electrically connecting combination defibrillation-heart monitoring equipment to a patient. In order to distinguish between the different types of electrodes, the impedance of the circuit formed by electrodes electrically connected to the patient is measured. If the measured impedance is greater than or equal to the impedance of the resistive element placed in series with the monitoring electrodes, then it is determined either that one or more monitoring electrodes are in use or that the defibrillation electrodes are not in good contact with the patient. If it is determined that one or more monitoring electrodes are in use or that the defibrillation electrodes are not in good contact with the patient, the operator is alerted to the determination and appropriate corrective actions are taken before a defibrillation discharge is allowed.
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Andrews Jonathan N.
Burton David L.
Hewlett--Packard Company
Kamm William E.
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