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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 ...
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.
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.
The reason why Poiseuille's law leads to a different formula for the resistance R is the difference between the fluid flow and the electric current. Electron gas is inviscid, so its velocity does not depend on the distance to the walls of the conductor. The resistance is due to the interaction between the flowing electrons and the atoms of the ...
The cannula is slightly withdrawn and it becomes patent.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.
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 supported by vacuum or inert-gas pressure. [7] Glassware are usually connected by tightly fitting and greased ground glass joints.
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