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1. 发明授权

US4860745A High frequency electrosurgical apparatus for thermal coagulation of biologic tissues 失效
标题翻译：高频电外科器械用于生物组织的热凝固
公开(公告)号：US4860745A
公开(公告)日：1989-08-29
申请号：US74553
申请日：1987-07-15
申请人： Gunter Farin , Reiner Haag , Peter Putz
发明人： Gunter Farin , Reiner Haag , Peter Putz
IPC分类号： A61B18/12
CPC分类号： A61B18/1206 , A61B2018/00666 , A61B2018/00702 , A61B2018/00708 , A61B2018/00761 , A61B2018/00767 , A61B2018/00827 , A61B2018/00857 , A61B2018/00886 , A61B2018/00892 , A61B2018/1273
摘要： A high frequency surgical apparatus for the thermal coagulation of biologic tissues is described, in which for monitoring the fluctuations in amplitude of the high frequency current during each coagulation process a current monitor (25) is provided, which by means of a current-to-voltage coverter generates an electrical voltage proportional to the amplitude fluctuations of the high frequency current, from which voltage, by means of a first detector, a first direct voltage proportional to the amplitude fluctuations is formed and, by means of a second detector acting as a peak value detector, a second direct voltage is formed that rises in proportion to the amplitude of the high frequency current. The first direct voltage (U.sub.a) and the second direct voltage (kU.sub.b), which is divided downward by an adjustable factor by means of a voltage divider, are supplied to a voltage comparator, the output signal of which sets a bistable circuit as soon as the first direct voltage (U.sub.a) becomes lower than the downwardly divided second direct voltage (kU.sub.b). The output signal of the bistable circuit switches the high frequency current off until the high frequency current is switched back on again by actuation of a manual switch and/or by means of an automatic switch. Instead of or in addition to this current monitor (25), and electric arc monitor (26) for monitoring the generation of anharmonic frequencies of the base frequency of the frequency generator can be connected to the output of the surgical apparatus, the arc monitor including a filter which passes at least one of the anharmonic frequencies, generated by the electric arc, of the base frequency of the high frequency generator. The output signal of the filter is supplied to a voltage comparator, the output signal of which resets a bistable circuit such that its output signal switches off the high frequency current.
摘要翻译：描述了用于生物组织的热凝固的高频手术装置，其中为了监测每个凝固过程期间的高频电流的幅度波动，提供了电流监视器（25），其通过电流 - 电压覆盖器产生与高频电流的幅度波动成比例的电压，通过第一检测器形成与振幅波动成比例的第一直流电压，并且借助于第二检测器峰值检测器，形成与高频电流的振幅成比例地升高的第二直流电压。通过分压器向下分配可调节因数的第一直流电压（Ua）和第二直流电压（kUb）被提供给电压比较器，其输出信号立即设置双稳态电路第一直流电压（Ua）变得低于向下划分的第二直流电压（kUb）。双稳态电路的输出信号切断高频电流，直到高频电流再次通过手动开关和/或自动切换开关重新接通。除了该电流监视器（25）以外，还可以将用于监视频率发生器的基频的非谐波频率的产生的电弧监视器（26）连接到外科装置的输出端，电弧监视器包括将通过电弧产生的至少一个非谐波频率的高频发生器的基频通过的滤波器。滤波器的输出信号被提供给电压比较器，其输出信号复位双稳态电路，使得其输出信号关断高频电流。

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