CA2154743A1 - Method and apparatus for electrosurgically treating tissue - Google Patents

Method and apparatus for electrosurgically treating tissue

Info

Publication number
CA2154743A1
CA2154743A1 CA002154743A CA2154743A CA2154743A1 CA 2154743 A1 CA2154743 A1 CA 2154743A1 CA 002154743 A CA002154743 A CA 002154743A CA 2154743 A CA2154743 A CA 2154743A CA 2154743 A1 CA2154743 A1 CA 2154743A1
Authority
CA
Canada
Prior art keywords
impedance
temperature
tissue
maximum
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002154743A
Other languages
French (fr)
Other versions
CA2154743C (en
Inventor
William L. Hassler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ethicon Endo Surgery Inc
Original Assignee
William L. Hassler
Ethicon Endo-Surgery Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by William L. Hassler, Ethicon Endo-Surgery Inc. filed Critical William L. Hassler
Publication of CA2154743A1 publication Critical patent/CA2154743A1/en
Application granted granted Critical
Publication of CA2154743C publication Critical patent/CA2154743C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206Generators therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/1442Probes having pivoting end effectors, e.g. forceps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00666Sensing and controlling the application of energy using a threshold value
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00666Sensing and controlling the application of energy using a threshold value
    • A61B2018/00678Sensing and controlling the application of energy using a threshold value upper
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00696Controlled or regulated parameters
    • A61B2018/00702Power or energy
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00696Controlled or regulated parameters
    • A61B2018/00702Power or energy
    • A61B2018/00708Power or energy switching the power on or off
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00773Sensed parameters
    • A61B2018/00791Temperature
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00773Sensed parameters
    • A61B2018/00875Resistance or impedance

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Otolaryngology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Laser Surgery Devices (AREA)
  • Control Of Temperature (AREA)

Abstract

Tissue impedance of tissue impedance in combination with tissue temperature is used to control electrosurgical tissue treatment. Tissue impedance alone provides better control of electrosurgical treatment by determining an initial maximum tissue impedance, a minimum tissue impedance selecting a point between the maximum and minimum impedances, preferably the average, as an impedance threshold, and turning off rf power to the electrosurgical instrument when the impedance reaches the threshold as it rises from the minimum. Control may also be by the combination of tissue impedance and temperature. Temperature is controlled to maintain a selected preferred temperature and a maximum temperature is also selected so that if the tissue reaches the maximum temperature, power is turned off. Impedance control is combined with temperature control so that the temperature of the instrument is maintained at a selected preferred temperature unless a maximum temperature is exceeded, which normally will not happen. The impedance is also monitored with maximum and minimum values being determined as well as a threshold impedance between the max and the min. When the threshold, preferably the average impedance, is reached, power is removed from the instrument.
CA002154743A 1994-07-28 1995-07-26 Method and apparatus for electrosurgically treating tissue Expired - Fee Related CA2154743C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/282,522 1994-07-28
US08/282,522 US5540684A (en) 1994-07-28 1994-07-28 Method and apparatus for electrosurgically treating tissue

Publications (2)

Publication Number Publication Date
CA2154743A1 true CA2154743A1 (en) 1996-01-29
CA2154743C CA2154743C (en) 2006-10-10

Family

ID=23081888

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002154743A Expired - Fee Related CA2154743C (en) 1994-07-28 1995-07-26 Method and apparatus for electrosurgically treating tissue

Country Status (9)

Country Link
US (1) US5540684A (en)
EP (1) EP0694291B1 (en)
JP (1) JPH0898845A (en)
AT (1) ATE207725T1 (en)
AU (1) AU688045B2 (en)
CA (1) CA2154743C (en)
DE (1) DE69523517T2 (en)
ES (1) ES2162899T3 (en)
SI (1) SI0694291T1 (en)

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AU688045B2 (en) 1998-03-05
CA2154743C (en) 2006-10-10
AU2501295A (en) 1996-02-08
EP0694291A1 (en) 1996-01-31
ES2162899T3 (en) 2002-01-16
EP0694291B1 (en) 2001-10-31
US5540684A (en) 1996-07-30
JPH0898845A (en) 1996-04-16
DE69523517D1 (en) 2001-12-06
ATE207725T1 (en) 2001-11-15
SI0694291T1 (en) 2002-02-28
DE69523517T2 (en) 2002-05-08

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