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    11.
    发明专利
    未知

    公开(公告)号：FI941787A

    公开(公告)日：1994-10-20

    申请号：FI941787

    申请日：1994-04-18

    Applicant: VALLEYLAB INC

    Inventor： KLICEK MICHAEL S ,  PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B18/14 ,  A61B17/36 ,  A61B17/39

    Abstract: A circuit, for monitoring and controlling parameters of an electrosurgical unit, ESU, relative to load and the RF energy, has a load responsive output sensing circuit that measures the ESU load. A signal modifier, attached to the sensing circuit enhances the signals measured and transmits them to a buffer. An analog to digital converter, A/D, digitize the signals and samples wave pulse train at about eight million samples per second. A data memory stores the digitized signals. A RF drive clock connects to the ESU output; a sample clock uses phase shifting to interrogate the input signals to a processor, DSP, at a greater sampling rate of frequency than without. The DSP receives the stored signals from the data memory and processes them while monitoring and calculating ESU parameters measured, i.e. voltage, current, power, load impedance, leakage current, peak to peak voltage, peak to peak current, spectral content and/or crest factor of the RF wave pulse train energy to use as controlling feedback to the either a high voltage power supply in the ESU, regulating the RF drive pulses or both. A method monitors and controls the ESU relative to load has the steps of collecting parameters with the ESU output sensing circuit responsive to loads; enhancing signals with the signal modifier; transmitting signals to the buffer; converting signals with the A/D converter; storing signals in the data memory; receiving signals in the DSP, and processing, monitoring and controlling signals by repeatedly measuring ESU output parameters.

    ADAPTIVE, RETURN ELECTRODE MONITORING SYSTEM
    13.
    发明专利
    ADAPTIVE, RETURN ELECTRODE MONITORING SYSTEM 未知

    公开(公告)号：CA1200286A

    公开(公告)日：1986-02-04

    申请号：CA413745

    申请日：1982-10-19

    Applicant: VALLEYLAB INC

    Inventor： NEWTON DAVID W ,  PATERSON WILLIAM G

    IPC: A61B18/00 ,  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.

    Monitoring arrangement for a return electrode
    14.
    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.

    Electrosurgical processor and method of use
    15.
    发明专利
    Electrosurgical processor and method of use 未知

    公开(公告)号：AU684756B2

    公开(公告)日：1998-01-08

    申请号：AU6289394

    申请日：1994-04-06

    Applicant: VALLEYLAB INC

    Inventor： KLICEK MICHAEL S ,  PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B18/14 ,  A61B17/39 ,  G05F1/00

    Abstract: A circuit, for monitoring and controlling parameters of an electrosurgical unit, ESU, relative to load and the RF energy, has a load responsive output sensing circuit that measures the ESU load. A signal modifier, attached to the sensing circuit enhances the signals measured and transmits them to a buffer. An analog to digital converter, A/D, digitize the signals and samples wave pulse train at about eight million samples per second. A data memory stores the digitized signals. A RF drive clock connects to the ESU output; a sample clock uses phase shifting to interrogate the input signals to a processor, DSP, at a greater sampling rate of frequency than without. The DSP receives the stored signals from the data memory and processes them while monitoring and calculating ESU parameters measured, i.e. voltage, current, power, load impedance, leakage current, peak to peak voltage, peak to peak current, spectral content and/or crest factor of the RF wave pulse train energy to use as controlling feedback to the either a high voltage power supply in the ESU, regulating the RF drive pulses or both. A method monitors and controls the ESU relative to load has the steps of collecting parameters with the ESU output sensing circuit responsive to loads; enhancing signals with the signal modifier; transmitting signals to the buffer; converting signals with the A/D converter; storing signals in the data memory; receiving signals in the DSP, and processing, monitoring and controlling signals by repeatedly measuring ESU output parameters.

    Apparatus for ESU leakage current control and relevant method
    16.
    发明专利
    Apparatus for ESU leakage current control and relevant method 未知

    公开(公告)号：AU678228B2

    公开(公告)日：1997-05-22

    申请号：AU6436294

    申请日：1994-04-26

    Applicant: VALLEYLAB INC

    Inventor： KLICEK MICHAEL S ,  PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B17/39

    Abstract: Apparatus and method find leakage due to tissue load or transients and has active and return electrodes for RF energy sensed by transformers for a circuit that finds leakage at more than two thousand times per second or a frequency dependent on the phase shift between voltage and current. Software and feedback manage Vrms to reduce the voltage or increase the crest factor, which is Vrms divided by peak voltage, by pulse width modulation of the RF drive. Voltage and current phase shift changes, angle theta , are compared to a threshold, and when greater, the frequency at which the differences between the active and return current signals are examined is increased. The differences between the active and return currents are examined and when greater than maximum leakage while in coagulation mode, the RF drive pulse width is reduced to maintain voltage wave peaks at a preset value and reduce Vrms thereby reducing leakage to the allowable maximum. Reducing the duty cycle or the pulse width of the output wave increases the crest factor. When the differences between active and return currents are greater than a maximum for leakage while in cut or bipolar mode, the Vrms is reduced to limit leakage to a maximum level. When the phase angle theta is less than a threshold, the frequency with which leakage is examined is reduced.

    Electrosurgical Processor and Method of Use
    18.
    发明专利
    Electrosurgical Processor and Method of Use 未知

    公开(公告)号：CA2160017A1

    公开(公告)日：1994-10-27

    申请号：CA2160017

    申请日：1994-04-06

    Applicant: VALLEYLAB INC

    Inventor： KLICEK MICHAEL S ,  PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B18/14

    Abstract: A circuit, for monitoring and controlling parameters of an electrosurgical unit, ESU, relative to load and the RF energy, has a load responsive output sensing circuit that measures the ESU load. A signal modifier, attached to the sensing circuit enhances the signals measured and transmits them to a buffer. An analog to digital converter, A/D, digitize the signals and samples wave pulse train at about eight million samples per second. A data memory stores the digitized signals. A RF drive clock connects to the ESU output; a sample clock uses phase shifting to interrogate the input signals to a processor, DSP, at a greater sampling rate of frequency than without. The DSP receives the stored signals from the data memory and processes them while monitoring and calculating ESU parameters measured, i.e. voltage, current, power, load impedance, leakage current, peak to peak voltage, peak to peak current, spectral content and/or crest factor of the RF wave pulse train energy to use as controlling feedback to the either a high voltage power supply in the ESU, regulating the RF drive pulses or both. A method monitors and controls the ESU relative to load has the steps of collecting parameters with the ESU output sensing circuit responsive to loads; enhancing signals with the signal modifier; transmitting signals to the buffer; converting signals with the A/D converter; storing signals in the data memory; receiving signals in the DSP, and processing, monitoring and controlling signals by repeatedly measuring ESU output parameters.

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