Trocars
A trocar is a sharp-tipped obturator inside a cannula, used to make a controlled puncture into a cavity. The obturator pierces; the cannula stays behind as a working channel for drainage, aspiration or the passage of instruments. The tip may be triangular, conical or bevelled depending on the tissue it has to cross.What the named patterns are forNelson and Ochsner are the general drainage patterns. Krause, Landau, Billroth and Douglas vary cannula diameter and tip geometry for different cavities. Lichtwitz and Eicken are the antral trocars used in sinus puncture and irrigation. Uckermann is the tracheal pattern. Pierce and Coakley are ENT designs.SetsUniversal trocar sets are supplied in 3-piece and 4-piece configurations, giving a range of cannula diameters on one handle — the practical choice where the required size is not known in advance.
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