| 摘要 |
<p>This invention is a monopolar electro-surgical instrument (1) having a blade (2) with an electrically conductive active electrode surface configured to improve cutting or cauterizing efficiency, and a blade for use in such instrument. In use, current (typically RF current) flows from the active electrode surface directly into patient tissue. In preferred embodiments, the blade's active electrode surface includes one or more conductive working edges shaped to focus energy from a current source so that the energy causes efficient cutting or cauterization of tissue adjacent to each working edge. Preferably, the blade's cross section satisfies at least one of the following criteria: a working edge having an edge angle of at least 50 degrees, an aspect ratio (of major to minor axis) greater than four (in embodiments with elliptical cross section), and a ratio of truncated working edge width to minor axis less than 1/3 (in embodiments with a truncated, beveled working edge).</p> |
