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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. [1] [2] Some trocars also include a valve mechanism to allow for insufflation.
Air-sensitive cannula used in synthetic chemistry. In biological research, a push-pull cannula, which both withdraws and injects fluid, can be used to determine the effect of a certain chemical on a specific cell. The push part of the cannula is filled with a physiological solution plus the chemical of interest and is then injected slowly into ...
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 tube stays in for as long as there is air or fluid to be removed, or risk of air gathering. Chest tubes can also be placed using a trocar, which is a pointed metallic bar used to guide the tube through the chest wall. This method is less popular due to an increased risk of iatrogenic lung injury.
The cannula is slightly withdrawn and it becomes patent. Blocked ostium: If the ostium of the sinus is blocked, the fluid doesn't return through it. To bypass the ostium, one more trocar and cannula are inserted at the site of the first one, a fluid returns through the other cannula.
Prior to the description of the Seldinger technique, sharp trocars were used to create lumens through which devices could be passed. This had a high rate of complications. [ 4 ] However, with the introduction of the Seldinger technique, angiography became a relatively risk-free procedure, and the field of interventional radiology blossomed.
Also attached is a fiber optic cable system connected to a "cold" light source (halogen or xenon) to illuminate the operative field, which is inserted through a 5 mm or 10 mm cannula or trocar. The abdomen is usually insufflated with carbon dioxide gas. This elevates the abdominal wall above the internal organs to create a working and viewing ...
cannula transfer, where liquids or solutions of air-sensitive reagents are transferred between different vessels stoppered with septa using a long thin tube known as a cannula. Liquid flow is achieved via vacuum or inert gas pressure. [3] A cannula is used to transfer THF from the flask on the right to the flask on the left.
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