A surgical instrument or pointed rod which slides inside a cannula to make a hole in tissue to drain off fluid.
An instrument used to draw off fluids from a body cavity (such as the peritoneal cavity). It comprises a metal tube containing a removable shaft with a sharp three-cornered point; the shaft is withdrawn after the trocar has been inserted into the cavity.
An instrument provided with a sharp three-sided point fitted inside a tube or cannula, and used for puncturing cavities of the body in which fluid has collected.
A sharply pointed surgical instrument contained in a cannula; used for aspiration or removal of fluids from cavities.
A compact and pointed tool utilized to pierce the abdomen at the commencement of a laparoscopic procedure.
A surgical tool that includes a perforator housed inside a cannula, designed for piercing a cavity. After puncturing, the perforator is withdrawn, leaving the cannula in place within the cavity to facilitate the drainage of fluid.