single stream instrument head for argon plasma coagulation

摘要

The present invention relates to a novel instrument (13) for electrosurgical treatment. comprises instrument head (17) forming lumen carrying body (23) which may be filled with gas. lumen (23) connects to at least a first opening (25) and a second opening (26, 27) in the head (17), from them gas will leave head (17) when lumen (23) is full . main stream (37) exits via the first (25) of the tissue head (17) (62). the second (26, 27) arranged with respect to the first (25) such that secondary flow (38, 39) exits, it flows close to main (37) and / or - optionally with additional secondary (38, 39) outside the additional second openings (26, 27) - away from the head (17), surrounding the main (37). In the flow path inside the head (17) leaving the first (25), there is electrode (61) to ignite plasma between the first (25) and tissue (62). because the secondary (38, 39) accompanies the main one (37), plasma ignition will be successful until instrument (13) is at a relatively large distance (78) from the tissue (62). if main (37) is formed with an instrument according to the invention with central flow out of first (25) and secondary (38, 39) is as surrounding flow out of second (26, 27), plasma ignition will also already be successful. the central (37) and surrounding (38, 39) streams fed by the same lumen (23) consisting of the same gas.