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    Monitoring arrangement for a return electrode
    2.
    发明专利
    Monitoring arrangement for a return electrode 未知

    公开(公告)号：DE3239640A1

    公开(公告)日：1983-05-19

    申请号：DE3239640

    申请日：1982-10-26

    Applicant: VALLEYLAB INC

    Inventor： NEWTON DAVID W ,  HULETT III FREDERIC M ,  PATERSON WILLIAM G ,  OVENS CHRISTOPHER

    IPC: A61B18/12 ,  A61B18/16 ,  A61N1/08 ,  A61B17/39

    Abstract: The monitoring arrangement for a return electrode which can be attached to a patient, with two conductors disposed at a distance from one another for connecting the electrode to a generator which emits an electrosurgical current flowing via the electrode, contains a circuit arrangement which applies a monitoring current via the conductors to the electrode. A signal, which is dependent on the impedance between the two conductors, is extracted by the monitoring current. A circuit device is provided which eliminates virtually every effect which the electrosurgical current could exert on the extraction of the signal when the generator is in operation and the patient is simultaneously in contact with the electrode. A circuit arrangement is furthermore provided which specifies a desired impedance range with at least an upper limit. A device, which ascertains whether the impedance lies within the desired range, responds to the impedance-dependent signal. The upper limit of the impedance range is re-adjusted so that the system is adapted to the respective impedance of the patient, to be specific depending on the respective measured impedance which lies within the desired range.

    RETURN ELECTRODE MONITORING SYSTEM FOR USE DURING ELECTROSURGICAL ACTIVATION
    4.
    发明专利
    RETURN ELECTRODE MONITORING SYSTEM FOR USE DURING ELECTROSURGICAL ACTIVATION 未知

    公开(公告)号：CA1200287A

    公开(公告)日：1986-02-04

    申请号：CA413756

    申请日：1982-10-19

    Applicant: VALLEYLAB INC

    Inventor： NEWTON DAVID W ,  HULETT FREDERIC M III ,  OVENS CHRISTOPHER

    IPC: A61B18/12 ,  A61N1/08 ,  A61B17/39 ,  G01R27/14

    Abstract: IMPROVED RETURN ELECTRODE MONITORING SYSTEM A return electrode monitoring system for use with a patient return electrode adapted for contacting a patient, the return electrode having two, spaced apart conductors attached thereto for connecting the electrode to a generator of electrosurgical current which passes through the electrode, the system comprising means for applying a monitoring current through the conductors to the electrode; detecting means responsive to the monitoring current for producing a signal which is a function of the impedance between the two conductors, the detecting means including means for substantially eliminating any effect the electrosurgical current might have on the production of the signal when the generator is operational and the patient is in contact with the electrode; means for establishing a desired range having at least an upper limit for the impedance; and determining means responsive to the signal for determining whether the impedance is within the desired range. The system also includes means for establishing a desired range having an upper limit and a lower limit for the impedance when the patient is in contact with the electrode elements; determining means responsive to the signal for determining whether the impedance is within the desired range; and adjusting means for adjusting the upper limit to adapt the system to the particular impedance of the patient in response to the particular impedance occurring within the desired range.

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