| 摘要 |
Endoscopic bipolar scissor blades are formed in a laminate assembly of an outer electrically conductive layer, an intermediate electrically insulating layer, and an inner face layer which is a coating of titanium dioxide, chromium dioxide, or zirconium dioxide. In one embodiment, the conductive layer is a metal blade, while the insulating material is a ceramic which is fixed to the metal blade. In a second preferred embodiment, the insulating layer and the inner face layer are applied simultaneously by coating the metal blade with a mixture of ceramic and titanium dioxide, chromium dioxide, or zirconium dioxide. In a third embodiment, the insulating layer is a molded ceramic blade, and the electrically conductive layer is metalized or otherwise fixed to the ceramic blade. In all embodiments, the cutting edges and shearing surfaces are insulated from the electrodes, and no short circuit can form between the electrodes even though the cutting edges and shearing surfaces are metal. Each of the embodiments may be applied to straight or curved scissor blades. A bipolar endoscopic instrument utilizing blades according to the invention is also disclosed.
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