G - Physics – 01 – R
Patent
G - Physics
01
R
326/15
G01R 27/14 (2006.01) A61B 18/12 (2006.01) A61N 1/08 (2006.01)
Patent
CA 1200287
IMPROVED RETURN ELECTRODE MONITORING SYSTEM Abstract A return electrode monitoring system for use with a patient return electrode adapted for contacting a patient, the return electrode having two, spaced apart conductors attached thereto for connecting the electrode to a genera- tor of electrosurgical current which passes through the electrode, the system comprising means for applying a monitoring current through the conductors to the elec- trode; detecting means responsive to the monitoring current for producing a signal which is a function of the impedance between the two conductors, the detecting means including means for substantially eliminating any effect the elec- trosurgical current might have on the production of the signal when the generator is operational and the patient is in contact with the electrode; means for establish- ing a desired range having at least an upper limit for the impedance; and determining means responsive to the signal for determining whether the impedance is within the desired range. The system also includes means for estab- lishing a desired range having an upper limit and a lower limit for the impedance when the patient is in contact with the electrode elements; determining means responsive to the signal for determining whether the impedance is within the desired range; and adjusting means for adjust- ing the upper limit to adapt the system to the particular impedance of the patient in response to the particular impedance occurring within the desired range.
413756
Hulett Frederic M. III
Newton David W.
Ovens Christopher
Mcfadden Fincham
Sherwood Services Ag
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