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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.
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 primary structural differences between microcannulas is the distance of the extrusion port or pore from the tip (closer is more precise), the bluntness of the tip (tapered blunt tip is easier for entry), and the flexibility of the shaft (enough flexibility to move around sensitive structures but enough rigidity for precise placement).
Alternative techniques for airway management and delivery of oxygen, volatile anesthetics or other breathing gases include the laryngeal mask airway, i-gel, cuffed oropharyngeal airway, continuous positive airway pressure (CPAP mask), nasal BiPAP mask, simple face mask, and nasal cannula.
The cannula is slightly withdrawn and it becomes patent.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.
A non-rebreather mask (NRB, non-rebreather, non-rebreather facemask, etc.) is a device used in medicine to assist in the delivery of oxygen therapy. A NRB requires that the patient can breathe unassisted, but unlike a low-flow nasal cannula , the NRB allows for the delivery of higher concentrations of oxygen .
Chest tubes are also provided in right angle, trocar, flared, and tapered configurations for different drainage needs. As well, some chest tubes are coated with heparin to help prevent thrombus formation, though the effect of this is disputed. [16] Chest tube have an end hole (proximal, toward the patient) and a series of side holes.
A tracheostomy tube may be single or dual lumen, and also cuffed or uncuffed. A dual lumen tracheostomy tube consists of an outer cannula or main shaft, an inner cannula, and an obturator. The obturator is used when inserting the tracheostomy tube to guide the placement of the outer cannula and is removed once the outer cannula is in place.
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