Surgery – Instruments – Electrical application
Patent
1998-06-15
2000-05-16
Cohen, Lee
Surgery
Instruments
Electrical application
606 32, 128908, A61B 1816
Patent
active
060630752
ABSTRACT:
An electrosurgical apparatus detects separation of a return electrode of the electrosurgical apparatus for cutting and coagulating an organic tissue from a patient. An impedance detecting section detects a contact impedance between the return electrode and the patient and generates an impedance detection signal corresponding to the contact impedance. A first discrimination section discriminates if the impedance detection signal generated by the impedance detecting section falls within a normal range of the contact impedance having predetermined upper and lower limits after the electrosurgical apparatus is powered on. When the first discrimination section detects that the impedance detection signal lies in the normal range, a storage section stores the then impedance detection signal as a reference signal. A second discrimination section discriminates if the return electrode is in an abnormal state where the return electrode is separated from the patient, based on a difference between the impedance detection signal, generated by the impedance detecting section, and the reference signal stored in the storage section.
REFERENCES:
patent: 4416276 (1983-11-01), Newton et al.
patent: 4848335 (1989-07-01), Manes
patent: 5830212 (1998-11-01), Cartmell et al.
Cohen Lee
Olympus Optical Co,. Ltd.
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