A laparoscopic cannula is an instrument used in laparoscopic surgery to make small incisions in the abdomen and insert the laparoscopic instrument into the body for operation. It usually consists of two parts: an inner casing and an outer casing.

The internal cannula is a thinner tubular instrument that is inserted into the abdominal incision to maintain the passage and seal of the abdominal incision. The internal cannula prevents air leakage or bleeding from internal organs in the abdomen.

The outer cannula is a thicker tubular instrument that covers the inner cannula and is used to stabilize and hold the inner cannula while forming a channel for the insertion of the laparoscopic instrument. The outer casing has the function of preventing the incision from expanding and providing sufficient working space.

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