Cannula 1

Catheters are designed for introducing various substances into cavities and tubular organs - solutions of drugs, nutrient media, as well as for removing fluids from the body and washing cavities of various origins. But the most widely represented among them are needles - mainly monopolar catheters. .

In otorhinolaryngology, two models of catheters are most often used - blind and graduated; the latter are not only called tracheotomy, but are also their emblem. **Thus, the principle of tracheostomy using both large bougienage and