A Comprehensive Guide for Blood Collection Devices Syringes and Needles Syringes and needles are among the most basic and widely used blood collection devices. Syringes have a barrel and plunger to draw and discharge fluids. They come in various sizes depending on the amount of blood needed. Needles have a hollow shaft and a sharp tip to puncture the skin and blood vessels. Needles are also available in different sizes and styles like straight...
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