| 摘要 |
PROBLEM TO BE SOLVED: To provide a disconnection spark detection circuit of an electronic therapeutic apparatus securely detecting only the spark noise generated when the cable portion of a probe is disconnected. SOLUTION: An input port is connected to the output side of a signal generating means for generating electric signals to be used for the therapy, an output port is connected to the conductor side, and a coupling port is connected to a spark noise detection system. The disconnection spark detection circuit comprises a directional coupler whose degree of coupling is set so that signals inputted from the input port are outputted to the output port and that only the signals inputted from the output port are outputted to the coupling port; a filter means for extracting a spark noise component of an output line from the signals outputted from the coupling port of the directional coupler; and a control means for determining whether the output line is disconnected or not based on the output of the filter means. COPYRIGHT: (C)2009,JPO&INPIT
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