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1. WO1996039085 - A CONTROL SYSTEM FOR NEUROSURGICAL ELECTROSURGICAL UNIT

Publication Number WO/1996/039085
Publication Date 12.12.1996
International Application No. PCT/IB1996/000547
International Filing Date 03.06.1996
Chapter 2 Demand Filed 23.12.1996
IPC
A61B 18/12 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
04by heating
12by passing a current through the tissue to be heated, e.g. high-frequency current
A61B 18/14 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
04by heating
12by passing a current through the tissue to be heated, e.g. high-frequency current
14Probes or electrodes therefor
CPC
A61B 18/1206
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
04by heating
12by passing a current through the tissue to be heated, e.g. high-frequency current
1206Generators therefor
A61B 18/1442
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
04by heating
12by passing a current through the tissue to be heated, e.g. high-frequency current
14Probes or electrodes therefor
1442Probes having pivoting end effectors, e.g. forceps
A61B 2018/00875
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
00636Sensing and controlling the application of energy
00773Sensed parameters
00875Resistance or impedance
Applicants
  • VALLEYLAB INC. [US]/[US]
Inventors
  • EGGLESTON, Jeffrey, L.
  • ORSZULAK, James, H.
  • SODNICAR, Matthew, J.
Agents
  • RICHARDS, John
Priority Data
08/470,53306.06.1995US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A CONTROL SYSTEM FOR NEUROSURGICAL ELECTROSURGICAL UNIT
(FR) SYSTEME DE COMMANDE POUR UNITE ELECTROCHIRURGICALE DE NEUROCHIRURGIE
Abstract
(EN)
A control system (10) and method for the operation of neurosurgical bipolar electrodes (11) provides a source of high frequency energy (13') connected to bipolar electrodes (11). Contacting surfaces are on the bipolar electrodes (11) of highly electrically conductive material. A current transducer attached to the source of high frequency energy (13') measures (20) the RMS current applied between the contact surfaces (25). A current transducer attached to the source of high frequency energy (13') provides a signal (26) correlated to the instantaneous values of the RMS voltage between the contacts. A control connects to the source of high frequency energy (13') for initially regulating the RMS current applied by the contacting surfaces in response to the impedance until the signal (19) divided by the measure (20) which is representative of the instantaneous impedance of the load reaches a predetermined value. The control regulates the RMS power applied by the contacting surfaces in accord with the impedance until the signal (19) divided by the measure (20) reaches a predefined value. The control responds to the measure (20) and the signal (19) so that the RMS voltage applied to the load being treated between the contacting surfaces regulated while its impedance is monitored until a prescribed value is reached. The control regulates the RMS voltage applied in accord with the impedance by changing the RMS voltage to a percentage of that applied until the prescribed value is obtained so that the tissues stay moist and are coagulated without drying and carbonizing or turning to eschar.
(FR)
L'invention se rapporte à un système de commande (10) et un procédé de fonctionnement d'électrodes bipolaires de neurochirurgie (11). Une source d'énergie haute fréquence (13') est reliée aux électrodes bipolaires (11), dont les surfaces de contact sont en matériau hautement électro-conducteur. Un transducteur d'intensité fixé à la source d'énergie haute fréquence (13') mesure (20) l'intensité efficace appliquée entre les surfaces de contact (25). Un transducteur d'intensité fixé à la source d'énergie haute fréquence (13') fournit un signal (26) corrélé aux valeurs instantanées de l'intensité entre les surfaces de contact. Un dispositif de commande relié à la source d'énergie haute fréquence (13') permet de réguler initialement l'intensité efficace appliquée par les surfaces de contact, en réponse à l'impédance, jusqu'à ce que le signal (19) divisé par la mesure (20) représentative de l'impédance instantanée de la charge atteigne une valeur prédéterminée. Le système de commande permet de réguler l'intensité efficace appliquée par les surfaces de contact, en fonction de l'impédance, jusqu'à ce que le signal (19) divisé par la mesure (20) atteigne une valeur prédéfinie. Le système de commande réagit à la mesure (20) et au signal (19) de sorte que la tension efficace appliquée à la charge traitée entre les surfaces de contact soit régulée, l'impédance étant contrôlée jusqu'à ce que sa valeur atteigne un seuil prédéterminé. Le système de commande régule la tension efficace appliquée en fonction de l'impédance en modifiant la valeur de cette tension selon un pourcentage donné, jusqu'à ce que la valeur préétablie soit obtenue, de sorte que les tissus restent humides et soient coagulés sans séchage et carbonisation ou transformation en escarres.
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