Trocar

A trocar, comprising:

• a puncturing device comprising a base and a puncturing portion, the puncturing portion extending along a direction perpendicular to the base, the puncturing portion comprising a bump and a tip, the tip being on an end of the puncturing portion opposite to the base, the bump extending from an outer surface of the puncturing portion radially;
• and
• a sleeving component comprising:
• a gas pressure base comprising a handle, a connecting portion, and a first gas valve, the handle comprising an opening, the puncturing portion being inserted into the opening, the base contacting the handle, the connecting portion extending from the handle and comprising an assembling channel, the assembling channel communicating with the opening, the first gas valve being connected with the connecting portion and communicating with the assembling channel;
• a first tube assembly comprising a first assembling end and a first sleeving end, the first assembling end being assembled into the assembling channel, the first assembling end corresponding to the first gas valve, a wall of the first sleeving end comprising at least one first opening;
• a second tube assembly comprising a second assembling end and a second sleeving end, the second assembling end being adjustably sleeved to the first sleeving end, wherein the second tube assembly is retractable relative to the first tube assembly to have the first tube assembly received in the second tube assembly;
• a fixation base fixed to the second sleeving end and comprising a passage, an inner wall, a guiding groove, a key groove, and a gas outlet, the passage penetrating through the fixation base, the inner wall extending from an inner surface of the fixation base towards the passage, the guiding groove communicating with the passage and being adjacent to the inner wall, the key groove being on the inner wall and communicating with the guiding groove, a width of an end of the key groove away from the guiding groove being less than that of an end of the key groove close to the guiding groove, the gas outlet being on a surface of the fixation base, a portion of the puncturing portion being in the assembling channel, the first tube assembly, the second tube assembly, and the passage, the tip being convex on the fixation base;
• and
• a gas cell sleeved to the fixation base and corresponding to the gas outlet,
• wherein while the bump of the puncturing device is entered into the key groove through the guiding groove, and the puncturing device is rotated to have the bump slide along the key groove until the bump contacts the inner wall to have the puncturing device secured to the fixation base, the puncturing device drives the sleeving component to move along an elongated direction of the puncturing device.