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    Electrosurgery safety circuit
    1.
    发明授权
    Electrosurgery safety circuit 失效
    静电安全电路

    公开(公告)号：US3683923A

    公开(公告)日：1972-08-15

    申请号：US3683923D

    申请日：1970-09-25

    Applicant: VALLEYLAB INC

    Inventor： ANDERSON ROBERT K

    IPC: A61B18/12 ,  A61B18/16 ,  H02H3/33 ,  A61B17/36 ,  A61N3/00 ,  H02H1/02

    CPC classification number: H02H3/33 ,  A61B18/1233 ,  A61B18/16 ,  Y10S128/908

    Abstract: A safety circuit suitable for use in electrosurgery apparatus to prevent electrical burns is described herein. A current sensing transformer having a pair of primary windings and a single secondary or sense winding is provided. The primary windings are connected so as to compare the input current applied to an active electrode with the output current from an indifferent plate. When the comparison is unequal, the sense winding generates an error signal that warns the operator of the electrosurgery apparatus of a possible electrical burn situation. Alternatively, the primary windings are connected so as to sense the equality of output currents from two indifferent plates. Lack of equality causes an error signal to be generated to warn the operator.

    Abstract translation: 本文描述了适用于电外科手术装置以防止电灼伤的安全电路。 提供具有一对初级绕组和单个次级或感测绕组的电流感测变压器。 连接初级绕组，以将施加到有源电极的输入电流与来自无差异板的输出电流进行比较。 当比较不相等时，感测绕组产生一个误差信号，警告电外科手术操作者可能的电烧伤情况。 或者，初级绕组被连接以感测来自两个无差异板的输出电流的相等性。 缺少相等性会导致产生错误信号以警告操作员。

    Electrosurgical generator
    2.
    发明授权
    Electrosurgical generator 失效
    静电发生器

    公开(公告)号：US3699967A

    公开(公告)日：1972-10-24

    申请号：US3699967D

    申请日：1971-04-30

    Applicant: VALLEYLAB INC

    Inventor： ANDERSON ROBERT K

    IPC: A61B18/12 ,  A61B17/36

    CPC classification number: A61B18/1206 ,  A61B18/12 ,  A61B2018/0066 ,  Y10S128/22

    Abstract: An isolated output electrosurgical generator suitable for generating cutting and coagulation electrosurgical currents is described. The electrosurgical generator using a single power stage generates three distinct and independent currents-a coagulation current for hemostasis or tissue destruction; a pure cutting current for cutting with a minimum amount of hemostasis; and a blended cutting current with a moderate amount of hemostasis. The electrosurgical generator includes a solid state power stage driven by two discrete frequencies that provide substantially differing cutting and coagulation characteristics. The electrosurgical generator also includes a solid state control circuit that controls the operation of the power stage. More specifically, the control circuit controls whether the power stage generates a current near the resonant frequency of the LC circuit so that a coagulation current or a blended cutting current is generated or whether the power stage generates a current at another frequency whereby a pure cutting current is generated. The output from the power stage is connected through an output circuit to suitable electrosurgical instrument terminals. An indicator circuit is used to provide audio and visual indication of activation of the electrosurgical generator. In addition, the electrosurgical generator provides electrical isolation on all output connections to prevent patient burns caused by alternate return current paths.

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