Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-02-02
1994-12-27
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
128696, 128908, A61N 139
Patent
active
053761049
ABSTRACT:
In a defibrillator with an electrocardiographic monitor which monitors electrocardiographic signals induced at electrodes by means of a preamplifier and supplying the signals to an electrocardiographic signal processing circuit through high-pass filters, the dynamic range of a preamplifier is made wider in accordance with the amplitude of a polarization voltage which is developed when a defibrillator is operated. A high-pass filter is formed of a first high-pass filter which operates in a normal state and a second high-pass filter whose blocking frequency is higher than that of the first high-pass filter so that the polarization voltage is attenuated without erasing the electrocardiographic signals. The second high-pass filter is operated in synchronization with the operation of the defibrillator during a time period corresponding to the time period in which the polarization voltage is generated.
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Kobayashi Nobutaka
Sakai Yoshio
Tsumura Ikuhiro
Kamm William E.
Nihon Kohden Corporation
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