Surgery – Truss – Pad
Patent
1974-11-04
1980-11-04
Cohen, Lee S.
Surgery
Truss
Pad
12830317, 361 42, A61B 1736
Patent
active
042313724
ABSTRACT:
A safety monitoring circuit for use in an electrosurgical unit is disclosed. The circuit is useful to indicate a fault in the return path between an RF source and a patient electrode in contact with a patient to prevent electrical burns to the patient that can occur due to improper patient contact with the patient electrode or a break in the return path. The circuit includes a current sensor connected in series in the return path to the RF source, which sensor provides an output indicative of the sensed current that is coupled through a DC amplifier to a comparator, the comparator providing an output only if a predetermined threshold is exceeded. When a comparator output is provided, a timer is triggered to energize, for a predetermined period of time, an alarm to indicate a sensed fault and/or actuate disabling circuitry to terminate application of electrical energy to the active electrode utilized in electrosurgery for cutting or coagulation.
REFERENCES:
patent: 3513353 (1970-05-01), Lansch
patent: 3683923 (1972-08-01), Anderson
patent: 3697808 (1972-10-01), Lee
patent: 3784842 (1974-01-01), Kremer
patent: 3812858 (1974-05-01), Oringer
patent: 3826263 (1974-07-01), Cage et al.
patent: 3828768 (1974-08-01), Douglas
patent: 3905373 (1975-09-01), Gonser
Baker Joseph J.
Cohen Lee S.
Ferguson Jr. Gerald J.
Valleylab Inc.
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