Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-10-11
1997-04-15
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 5, A61N 139
Patent
active
056204698
ABSTRACT:
A method and apparatus for treating ventricular tachycardia arrhythmias using an ICD system delivers a series of stepped cardioversion pulses that include at least a first and second cardioversion countershock of low energy values that are less than about 5 joules. The energy values of each cardioversion countershocks increase in stepped progressions such that the low energy value of the first cardioversion countershock is less than the second and all subsequent cardioversion countershocks. The use of a series of stepped cardioversion pulses minimizes the possibility of "overstimulating" heart cells in any reentrant loop that are causing the ventricular tachycardia. As a result, the possibility of inducing fibrillation by the cardioversion therapy is significantly decreased. The leading edge of each of the series of stepped cardioversion pulses is sufficient to just stimulate any heart cells that are in phase 4, but is not strong enough to stimulate heart cells that are in phase 3. Thus, if a reentrant loop is within the reaches of the leading edge of a pulse, that reentrant loop is converted without the possibility of inducing fibrillation.
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Angeion Corporation
Kamm William E.
Layno Carl H.
Pedersen Brad D.
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