Title:
電気外科用システム
Document Type and Number:
Japanese Patent JP4124647
Kind Code:
B2
Abstract:
An electrosurgical system has an electrosurgical generator and a bipolar electrosurgical instrument, the generator being arranged to perform a treatment cycle in which radio frequency energy is delivered to the instrument as an amplitude-modulated radio frequency power signal in the form of a succession of pulses characterised by periods of at least 100 milliseconds between successive pulses and by a predetermined pulse mark-to-space ratio. Energy delivery between pulses is substantially zero and the mark-to-space ratio is typically 1:4 or less. Each burst is of sufficiently high power to form vapour bubbles within tissue being treated and the time between successive pulses is sufficiently long to permit condensation of the vapour. The treatment cycles may each include an initial period and a subsequent period, the pulse duty cycle being increased or energy delivered continuously in the subsequent period in order that tissue coagulation can be achieved quickly despite increasing tissue impedance.
Inventors:
Goble, Colin Charles Owen
Application Number:
JP2002538842A
Publication Date:
July 23, 2008
Filing Date:
October 29, 2001
Export Citation:
Assignee:
GYRUS MEDICAL LIMITED
International Classes:
A61B18/12; A61B18/14
Domestic Patent References:
| JP9056725A |
Foreign References:
| US4038984 | ||||
| EP0754437A1 | ||||
| US4492231 |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
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