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A trocar (or trochar) is a medical or veterinary device used in minimally invasive surgery. Trocars are typically made up of an awl (which may be metal or plastic with a pointed or tapered tip), a cannula (essentially a rigid hollow tube) and often a seal .
Its size mainly ranges from 14 to 26 [2] gauge. Different-sized cannula have different colours as coded. Different-sized cannula have different colours as coded. Decannulation is the permanent removal of a cannula ( extubation ), [ 3 ] especially of a tracheostomy [ 4 ] cannula, once a physician determines it is no longer needed for breathing.
Chest tubes are made in a range of sizes measured by their external diameter from 6 Fr to 40 Fr. Chest tubes, like most catheters, are measured in French catheter scale. For adults, 20 Fr to 40 Fr (6.7 to 13.3mm external diameter) are commonly used, and 6 Fr to 26 Fr for children.
Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [2] For example, a catheter with a French size of 9 would have an outer diameter of approximately 3 mm. While the French scale aligns closely with the metric system, it introduces redundancy and the potential for rounding errors.
Lichtwitz antrum-puncture trocar and canula: used in nasal sinus surgery; conform presence of puss in maxillary sinus; cytological examination of antral wash out fluid; lavage of the maxillary sinus; introduction of medication and indwelling polythene tube into the sinus Tilly's antral harpoon trocar
The size of the peripheral vein limits the amount and rate of medication which can be administered safely. [35] A peripheral line consists of a short catheter inserted through the skin into a peripheral vein. This is usually in the form of a cannula-over-needle device, in which a flexible plastic cannula comes mounted over a metal trocar. Once ...
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