Smoke evacuation tube and telescopic smoke evacuation scalpel

A telescopic smoke evacuation scalpel, comprising a smoke evacuation tube, characterized in that, the smoke evacuation tube comprising a first sleeve (6) and a second sleeve (26), the first sleeve (6) includes a first sleeve front section (61) and a first sleeve rear section (62), and an electrode (8) is installed 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 larger than the diameter of the second sleeve (26), on or outside the second sleeve (26) and located at the first sleeve (6) is provided with an engaging structure for assembling a lower conductive sheet (7);

• the lower conductive sheet (7) is provided with conductive branches (71) extending vertically or obliquely toward the central axis of the second sleeve (26);
• a rib (27) connecting the first sleeve (6) and the second sleeve (26) is arranged on the second sleeve (26);
• the telescopic smoke evacuation scalpel also includes a button (1), an upper cover (2), a PCB board (3), a pen body (4), a front cap (5), a tail cap (9) and an upper conductive sheet (10), and the first sleeve rear section (62) is provided with a communication hole away from the end of the first sleeve front section (61), one end of the lower conductive sheet (7) is connected to the electrode (8), and the other end of the lower conductive sheet (7) extends out along the communication hole to the outside of the rear section of the first sleeve (62) is then in contact with the upper conductive sheet (10), and the PCB board (3) is electrically connected to the upper conductive sheet (10);
• the pen body (4) is tubular, one end of the first sleeve (6) extends into the inside of the pen body (4), and the pen body (4) is inlaid with the upper conductive sheet (10), the tail cap (9) is clamped on the end of the pen body (4) away from the electrode (8), the top of the pen body (4) is provided with an opening, the upper cover (2) is installed at the opening, and the PCB board (3) electrically connected with the upper conductive sheet (10), the PCB board (3) is provided with a contact corresponding to the button (1), the PCB board (3) is electrically connected with a connecting wire (11), and the connecting wire (11) extending out to the outside of the pen body (4) along the tail cap (9), other end of the connecting wire (11) is electrically connected to a plug;
• the front cap (5) is rotatably mounted on the pen body (4) facing the electrode (8) end, the first sleeve (6) passes through the front cap (5), and the inner wall of the front cap (5) is symmetrically connected with two arc-shaped locking parts (12), and inner wall of the pen body (4) at an end adjacent to the electrode (8) is symmetrically provided with two locked parts (13) having an increased inner diameter, and the two arc-shaped locking parts (12) are located at the two locked parts (13) respectively;
• the arc-shaped locking parts (12) are locking pieces, the locked parts (13) are notched to be locked;
• the lower conductive sheet (7) connected to the electrode (8) is designed with inverted teeth (15), and the lower conductive sheet (7) is connected to the electrode (8) on multiple sides, and the lower conductive sheet (7) away from end of the electrode (8) is designed with barbs (16).