A process for forming a figure on a product of stainless-steel, firstly, drafting a figure on a sheet of paper and generates a first film of the figure, such that the area where the figure locates is white and the remaining area is black. Then, generating a second film of the figure based on the first film, such that the area where the figure locates is constituted by a plurality of black dots and the area other than the black dots is white. After that, engaging the second film with a silk-screen coated with sensitizers and exposing the second film, such that the figure on the second film is copied to the silk-screen, and rinsing the silk-screen. Thereafter, putting the silk-screen on a stainless-steel plate and brushes a protecting film of anti-erosive material on an overall area of the silk-screen. Subsequently, removing the silk-screen and immersing the stainless-steel plate in etchants for a period of time. Finally, processing the etched stainless-steel plate to form a desired product.
A method is provided for making an electrode tip for use in a bipolar electrosurgical instrument from a single flat blank of metal. The method uses a photo chemical machining process. The resultant electrode tip has a generally loop shaped working portion. Use of the flat blank of metal results in electrodes having working portions with sharp edges in cross-section. The working portions emit concentrated energy in the radial direction.
An electrode tip is provided for use in a bi polar electrosurgical instrument. The electrode tip has a generally loop shaped working portion, including a first and second electrode, The first electrode is generally loop shaped. The second electrode generally surrounds the first electrode and is generally spaced from and coplanar with the first electrode. The electrodes have sharp edges in cross-section which emit concentrated energy in the radial direction.
