F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 55/28 (2006.01) F16L 55/26 (2006.01) A61B 17/36 (1990.01)
Patent
CA 2119973
ABSTRACT OF THE DISCLOSURE Electrosurgery apparatus has a large area return electrode, which can be of various different kinds and may have a monitor for detecting correct connection of the return electrode. In the present invention the monitor has three contacts in a socket that connect with two or three contacts on a plug connected to the return electrode. One pair of contacts in the socket is connected across an oscillator that provides an output to a first primary winding of the transformer when there is a low impedance between the contacts. Another pair of contacts is connected across a second primary winding and produces a loading on the transformer when short circuited by the return electrode. A detector is connected to the secondary winding of the transformer and produces an alarm and disable signal if the signal on the secondary winding falls below an upper limit or exceeds a lower limit.
Fetherstonhaugh & Co.
Smiths Industries Public Limited Company
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