专利名称：Instrument for cutting, coagulating and
ablating tissue
发明人：Steven A. Daniel,Mark J. Cowell申请号：US08/032160申请日：19930312公开号：US05425731A公开日：19950620
摘要：An instrument for cutting, ablating and coagulating tissue has a rod of
ferromagnetic material fusion welded to the base of a conical tip of copper with the rodadjacent the base of the conic being of lesser diameter than the base to provide a regionto accept a potted coil of wire about the rod whereby when the coil is connected to aconstant current high frequency source the rod and tip are heated to a temperatureapproaching the Curie temperature of the ferromagnetic rod. As Curie temperature isapproached the rod becomes essentially non-magnetic heating decreases to produce atemperature below Curie temperature and the cycle repeats. As a result of the excellentheat exchange interfaces produced by fusion welding the energy delivered to the tissueor other load which may be non-biological is closely controlled by temperature which isself regulated. A ferromagnetic sleeve is placed about the coil to concentrate magneticflux in the rod. An outer sleeve spaced radially from the ferromagnetic sleeve and ofrelatively non-heat conductive material extends from the base of the tip away from thetip to provide a handle for the instrument.
申请人：METCAL, INC.
代理人：Howard L. Rose
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