Abstract: This patent relates to a smoke evacuation tube and a telescopic smoke evacuation scalpel comprising the smoke evacuation tube. The smoke evacuation tube, comprises a first sleeve (6) and a second sleeve (26). An electrode (8) is mounted inside the first sleeve front section (61), and one end of the electrode (8) protrudes from one end of the first sleeve front section (61); the diameter of the first sleeve (6) is greater than the diameter of the second sleeve (26); a engaging structure used for assembling a lower conductive piece (7) is provided on or outside the second sleeve (26) and inside the first sleeve (6). The telescopic smoke evacuation scalpel comprises an upper conductive piece (10), which is embedded on the pencil body (4); the end of the first sleeve rear section (62) distant from the first sleeve front section (61) is provided with a connection hole.

Abstract: Embodiments provide a telescopic structure for an electrotome capable of evacuating smoke, including an electrotome pencil body. The electrotome pencil body is hollow inside and provided with an opening end at one end; the opening end of the electrotome pencil body is provided with a limit connection part. The limit connection part is sleeved with a collar; an elastic limiter is provided between the limit connection part and the collar. The telescopic structure for an electrotome capable of evacuating smoke further includes a channel that penetrates the collar and the elastic limiter in sequence and communicates with the inside of the electrotome pencil body. The telescopic structure for the electrotome capable of evacuating smoke enables the electrotome to adjust the length of the electrotome with one hand during use, which is more convenient in use and more convenient in operation.