EP 1458300 A1 20040922 - A SURGICAL INSTRUMENT
Title (en)
A SURGICAL INSTRUMENT
Title (de)
CHIRURGISCHES INSTRUMENT
Title (fr)
INSTRUMENT CHIRURGICAL
Publication
Application
Priority
- GB 0205893 W 20021223
- GB 0130975 A 20011227
- GB 0206207 A 20020315
- GB 0215402 A 20020703
Abstract (en)
[origin: WO03055402A1] An electrosurgical cutting blade 1 comprises a first electrode 2, a second electrode 3, and an electrical insulator 4 separating the first and second electrodes. The first and second electrodes have dissimilar characteristics cross-sectional area, thermal conductivity etc. such that the first electrode 2 is encouraged to become an active electrode and the second electrode 3 is encouraged to become a return electrode. The spacing between the first and second electrodes between 0.25 mm and 3.0 mm and the peak voltage supplied to the electrodes 2 and 3 are both selected such that arcing does not occur directly between the electrodes, but between the first electrode and the tissue at the target site. The arrangement is such that, in use, a thermal differential of at least 50° C is established between the first and second electrodes 2 and 3, such that the second electrode is maintained below a temperature of 70° C. This is achieved either by thermally insulating the second electrode from the first electrode, and/or by transferring heat away from the second electrode, e.g. by conduction, forced cooling, or by means of a heat pipe 27.
[origin: WO03055402A1] An electrosurgical cutting blade (1) comprises a first electrode (2), a second electrode (3), and an electrical insulator (4) separating the first and second electrodes. The first and second electrodes have dissimilar characteristics (cross−sectional area, thermal conductivity etc.) such that the first electrode (2) is encouraged to become an active electrode and the second electrode (3) is encouraged to become a return electrode. The spacing between the first and second electrodes (between 0.25 mm and 3.0 mm) and the peak voltage supplied to the electrodes (2 and 3) are both selected such that arcing does not occur directly between the electrodes, but between the first electrode and the tissue at the target site. The arrangement is such that, in use, a thermal differential of at least 50° C is established between the first and second electrodes (2 and 3), such that the second electrode is maintained below a temperature of 70° C. This is achieved either by thermally insulating the second electrode from the first electrode, and/or by transferring heat away from the second electrode, e.g. by conduction, forced cooling, or by means of a heat pipe (27).
IPC 1-7
IPC 8 full level
A61B 18/14 (2006.01)
CPC (source: EP)
A61B 18/14 (2013.01); A61B 18/1402 (2013.01); A61B 2018/126 (2013.01); A61B 2018/1412 (2013.01)
Citation (search report)
See references of WO 03055402A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
WO 03055402 A1 20030710; AU 2002358220 A1 20030715; AU 2002358220 B2 20080925; CN 100362969 C 20080123; CN 1610526 A 20050427; EP 1458300 A1 20040922; JP 2005512726 A 20050512; JP 4313205 B2 20090812
DOCDB simple family (application)
GB 0205893 W 20021223; AU 2002358220 A 20021223; CN 02826427 A 20021223; EP 02791916 A 20021223; JP 2003555981 A 20021223