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 Reported complications of trocar placement include laceration to intraabdominal organs, hemorrhage from intraabdominal vessels, and subcutaneous emphysema.

In its simplest configuration, a trocar is a pen‐shaped instrument with a sharp triangular point at one end, typically used inside a hollow cylinder, known as a cannula or sleeve, which provides an access port into a cavity during surgery. Rigid telescopes must be placed through a cannula in order to gain access to the body cavity. The literature shows a notable inconsistency of terminology; often trocar is used to describe the assembly of a cannula with its associated obturator. A cannula–trocar assembly is made up of three components: a cannula, seal, and obturator.

A cannula is a tube‐shaped metal or plastic shaft placed in the patient to allow access into the abdominal cavity during a laparoscopic procedure. Cannulas are sometimes sutured in place to the body wall or thoracic wall to ensure they do not migrate; they can also be screwed in place or held in place by inflatable balls and plastic flanges. Sheaths are protective shafts that are usually locked in place on the telescope, such as used with cystoscopes and arthroscopes [1].