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28 records (took 0.028 seconds)

    1.
    发明专利
    未知

    公开(公告)号：NO954153L

    公开(公告)日：1995-10-18

    申请号：NO954153

    申请日：1995-10-18

    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.

    2.
    发明专利
    未知

    公开(公告)号：NO954153D0

    公开(公告)日：1995-10-18

    申请号：NO954153

    申请日：1995-10-18

    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.

    APPARATUS FOR LEAKAGE CONTROL AND METHOD FOR ITS USE
    3.
    发明专利
    APPARATUS FOR LEAKAGE CONTROL AND METHOD FOR ITS USE 未知

    公开(公告)号：CA2165186A1

    公开(公告)日：1995-02-09

    申请号：CA2165186

    申请日：1994-04-26

    Applicant: VALLEYLAB INC

    Inventor： KLICEK MICHAEL S ,  PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B17/39

    Abstract: An apparatus (10) and method to find leakage due to tissue load or transients at the start or end of electrosurgery. Active and return electrodes (11 and 16) between a patient and an ESU (13) pass RF energy sensed by inductive transformers (17 and 19). A circuit finds leakage at more than two thousand times per second; that frequency depends on the phase shift (23) between voltage and current. Software and feedback (26) manage RMS voltage to reduce the peak voltage of the output wave or increase the crest factor by pulse width modualtion of the RF drive. Phase shift (23) changes of the active and return current signals (18 and 20) and peak voltage and current are found. The phase angle .theta. is compared to a threshold and if greater than the frequency at which the differences (22) between the active and return current signals (18 and 20) are examined is increased. The differences (22) between the active and return current signals (18 and 20) are examined and if greater than a maximum for leakage while the mode selected is in coagulation then the pulse width of the RF drive is reduced to hold voltage wave-form peaks at a predetermined value while the RMS voltage is reduced to lower the leakage to a maximum or the frequency at which the leakage current is calculated is held to a maximum level until the phase angle is smaller than the threshold. If the difference (22) is greater than a maximum for leakage while the mode is cut or bipolar then the Vms is reduced to a maximum level or the level remains high until the phase angle .theta. is smaller than a threshold. The crest factor is increased by reducing the duty cycle or the pulse width of the output wave shape.

    APARATO DE CONTROL DE POTENCIA DE SALIDA DE UN GENERADOR ELECTROQUIRURGICO.
    5.
    发明专利
    APARATO DE CONTROL DE POTENCIA DE SALIDA DE UN GENERADOR ELECTROQUIRURGICO. 未知

    公开(公告)号：MX9709020A

    公开(公告)日：1998-03-31

    申请号：MX9709020

    申请日：1996-06-03

    Applicant: VALLEYLAB INC

    Inventor： PATERSON WILLIAM G

    IPC: A61B18/12 ,  A61B17/39

    Abstract: Un aparato de control de potencia para un generador electroquirurgico se usa para controlar la potencia de salida de un generador al tejido o fluidos corporales de un paciente; el aparato de control determina rápidamente la gama de impedancias de la carga sobre el generador electroquirurgico y ajusta la potencia de salida en conformidad; la corriente de salida y la tension de salida del generador electroquirurgico son monitoreadas y enviadas a un microprocesador; el microprocesador opera un algoritmo que determina rápidamente la gama de impedancias de la carga sobre el generador; el algoritmo utiliza técnicas computacionales, tales como comparaciones y desplazamiento de bits, que evitan divisiones largas y otras operaciones que consumen tiempo; de esta manera, el microprocesador puede ajustar una fuente de energía de alto voltaje que efectua la etapa de amplificadora de radiofrecuencia; también se describe un método para controlar la potencia del generador electroquirurgico, incluyendo etapas en el algoritmo.

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