Thus, there is a need to discuss the proper selection of a needle. Hypodermic needlesĪ 2-part syringe cannot discharge its essential functions if a needle is not attached to its tip. In addition, as a precaution, a syringe should not be filled to its maximum capacity when aspirating a fluid because the plunger may be dislodged from the barrel. Through this method, the graduation marks on the syringe to be used will be in the smallest possible increments for the volume to be measured, leading to a more accurate measurement of the needed volume. If 3.8 ml of fluid needs to be injected, then a 5 ml syringe should be selected. For instance, if the fluid volume to be injected is 2.3 ml, then a 3 ml syringe should be used. The basic rule is that when the size of the syringe to be used is being determined, the capacity of the syringe, which is next in a size larger than the volume to be measured, should be selected. Syringes are available in different sizes ranging from 1 to 60 ml. This is used when the needle needs to be parallel with the injection plane, such as in the intradermal route of administration or puncturing superficial blood vessels. In the eccentric type, the syringe tip is off-center. In the centric style, the syringe tip is at the center of the bottom end. Under this type of 2-part syringe, there are two sub-types: (1) the centric and (2) the eccentric. The needle is reasonably secure, but there is a possibility that it may come off if not firmly or snugly attached or if considerable pressure is applied on it. In the Luer-slip syringe tip, the needle is held in place by the force of friction. The syringe tips could be in the form of Luer-slip. The larger the size is, the more prominent will be the interval between the graduation lines. ![]() These graduation lines are expressed in terms of milliliters or fractions of a milliliter, depending on the size of the syringe. To know the volume of fluid currently inside the syringe, we can find the graduation lines marked on the side of the barrel. This opening is provided with a tapering tip where the needle is eventually attached. The barrel has an opening at the bottom end. If it is pulled out, the fluid will be drawn inside the barrel. If the plunger is pushed down the barrel, the liquid will be forced out of the syringe. The barrel is the hollow and tube-like part of the syringe that holds the fluid to be injected or aspirated. So it is actually a piston-type rod that could go down and up the barrel. It is basically made up of a straight plastic rod which is in turn made up of polypropylene. This part is responsible for pushing or pulling any form of liquid in or out of the barrel. That fluid could be in the form of blood or medication. Basically, a syringe is a medical device used to inject or remove fluids from the body.
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