Surgery – Instruments – Heat application
Patent
1993-03-12
1995-06-20
Aschenbrenner, Peter A.
Surgery
Instruments
Heat application
219229, 606 29, 606 32, A61B 1736
Patent
active
054257310
ABSTRACT:
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 rod adjacent the base of the conic being of lesser diameter than the base to provide a region to accept a potted coil of wire about the rod whereby when the coil is connected to a constant current high frequency source the rod and tip are heated to a temperature approaching the Curie temperature of the ferromagnetic rod. As Curie temperature is approached the rod becomes essentially non-magnetic heating decreases to produce a temperature below Curie temperature and the cycle repeats. As a result of the excellent heat exchange interfaces produced by fusion welding the energy delivered to the tissue or other load which may be non-biological is closely controlled by temperature which is self regulated. A ferromagnetic sleeve is placed about the coil to concentrate magnetic flux in the rod. An outer sleeve spaced radially from the ferromagnetic sleeve and of relatively non-heat conductive material extends from the base of the tip away from the tip to provide a handle for the instrument.
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Cowell Mark J.
Daniel Steven A.
Aschenbrenner Peter A.
Metcal Inc.
Rose Howard L.
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