Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-09-29
1995-01-31
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 15, A61N 139
Patent
active
053855752
ABSTRACT:
An improved implantable cardioverter defibrillator (ICD) system having a programmable switched and variable range of effective output capacitance values for the purpose of producing a capacitive-discharge countershock. The improvement comprises a pulse generating capacitor arrangement for the ICD system that includes two or more separate capacitor systems and a system for selectively electrically connecting each of the capacitor systems in parallel with the other capacitor systems during the charging and discharging of the pulse-generating capacitor arrangement, such that the pulse generating capacitor arrangement has at least two different selectable effective output capacitance values. With this type of capacitor arrangement, it is possible to reduce the countershock energy in discrete steps as the duration of the countershock is decreased, while still preserving the value of the initial discharge voltage, and hence the conversion effectiveness. Reducing countershock pulse duration in steps having differing output capacitance also preserves the fraction of stored energy that is delivered to the heart, and hence, preserves the efficiency of the system, thereby conserving battery life, reducing ICD system size, or both.
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Angeion Corporation
Getzow Scott M.
Kamm William E.
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