Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1998-04-17
1999-12-07
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 139
Patent
active
059998520
ABSTRACT:
A defibrillator method and apparatus wherein a patient's measured transthoracic impedance (TTI) is used to control the amount of energy contained in a defibrillation pulse applied to the patient. Prior to delivering a defibrillation pulse, the patient's TTI is measured by an impedance measuring circuit (11). The patient's TTI may also be measured during delivery of a prior defibrillation pulse. A microprocessor (23) uses the measured patient TTI to control the shape of the defibrillation pulse by controlling: (i) the phase duration of the defibrillation pulse; and (ii) the voltage level to which the defibrillator's capacitor bank (15) is charged. The defibrillation pulse shape is controlled so that the energy conveyed by the defibrillation pulse to the patient is near or exceeds a desired value. The desired value may be set by an operator via an energy selector (25). A switch (13) controls the connection of defibrillator electrodes (27a, 27b) to the impedance measuring circuit (11) and the capacitor bank (15).
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Borschowa Lawrence A.
Chapman Fred W.
Elabbady Tarek Z.
Nova Richard C.
Sullivan Joseph L.
Evanisko George R.
Kamm William E.
Physio-Control Manufacturing Corporation
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