Surgery – Instruments – Electrical application
Patent
1996-05-15
1999-04-13
Lacyk, John P.
Surgery
Instruments
Electrical application
606 46, 606 48, A61B 1738
Patent
active
058938460
ABSTRACT:
A process for providing an endoscopic scissors blade with the necessary roughness to receive a ceramic coating, without first requiring that the blade surfaces be roughened by gritblasting, includes obtaining an investment mold with an interior textured surface. The investment mold is textured by first texturing an injection mold cavity by etching, gritblasting, or electric-discharge machining the inside surface of the injection mold cavity to produce a desired roughness. A blade pattern (wax) is then formed in the injection mold with a resulting textured surface, and using the textured blade pattern, the investment mold with the textured interior cavity is generated. When metal is injected into the investment mold using a lost wax process, the resulting cast blades will have the necessary roughness for permitting a ceramic to be bonded thereto without the need for any additional roughening. Thus, the so-formed blades are coated with a ceramic material. Such scissors blades are used in an endoscopic surgical scissors instrument and are especially useful as the scissor blades of a bipolar cautery endoscopic scissors instrument.
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Bales Thomas O.
McBrayer Michael Sean
Sixto, Jr. Robert
Gallagher Thomas A.
Gordon David P.
Jacobson David S.
Kearney Rosiland
Lacyk John P.
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