Trocar

The trocar is a tool that helps in minimally invasive surgery, sharp or dull, there is provided an access to a body cavity (such as the abdominal cavity, chest cavity ) and held open by a tube ( = tube). Is a pin which is seated in a tube with an inner diameter of, for example, 0.5-12 mm, and the tip closing the opening of the tube. Tube and trocar are inserted through the abdominal wall into the abdominal cavity, for example. The surgeon then has to look after pulling out of the trocar from the tube, the possibility of having a lens ( endoscope ) through the tube into the abdomen or to operate minimally invasive within the abdominal cavity with gripping, cutting and other instruments.

Modern trocars are either made ​​of titanium, surgical steel or plastic and are manufactured as one or more reusable instruments. The tips are adapted to the tubes and have sharp cutting edges for sharp dissection of the access path or a blunt, conical tip for blunt dissection. The tubes specifically for the inspection of body or joint cavities ( laparoscopy, thoracoscopy, arthroscopy ) may include a valve mechanism, a connection for insufflation ( blowing ) of CO2 or rinsate or other additional equipment possess.

In veterinary medicine used trocars also for discharging gas retention ( bloat ) in the rumen ( rumen puncture ) or appendicitis.