Surgery – Instruments – Electrical application
Patent
1998-04-10
2000-11-07
Cohen, Lee
Surgery
Instruments
Electrical application
606 38, 606 41, A61B 1812
Patent
active
061429929
ABSTRACT:
A high frequency power supply for applying electrical energy to a target site on or within a patient's body includes an electrical output driver, an output current sensor detecting the current output from the driver, and a power limiting device coupled to the current sensor during normal conditions, the power limiting device operates on a continuous basis. When current output exceeds a predetermined threshold level, the power limiting device is adapted to reduce power on the output driver to a standby mode. The power limiting device operates on a periodic detection or duty cycle when in the standby mode. The power limiting device switches into the stand-by mode to prevent excessive power drains. The power supply operates at a low power, pulsatile manner when an attached probe is in conductive or isotonic fluid but is not engaging body tissue or near a high impedance source. In this pulsatile mode, the power supply operates in a cyclical manner, typically at a predetermined duty cycle.
REFERENCES:
patent: 5318563 (1994-06-01), Malis et al.
patent: 5556397 (1996-09-01), Long et al.
patent: 5722975 (1998-03-01), Edwards et al.
patent: 5897553 (1999-04-01), Mulier
patent: 5944715 (1999-08-01), Goble et al.
patent: 6004319 (1999-12-01), Goble et al.
Cheng Andrew M. L.
Eggers Philip E.
Thapliyal Hira V.
ArthroCare Corporation
Cohen Lee
Raffle John T.
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