![]() ![]() Blunt needles tended to produce larger drop volumes compared to sharp beveled needles, but these differences did not reach statistical significance. Intermediate gauges (27, 25, 23G) yielded intermediate drop volumes. Mean drop volume scaled directly with needle diameter with drop volumes of 25.0 μL (☒0.2) and 83.9 μL (☑6.5) being found for 30-gauge and 22-gauge needles, respectively. Mean drop volume was affected by needle gauge, needle orientation, and whether the needle had been broken off from its hub. Vertical and horizontal orientation of the needle was tested for effect on drop volume for 22-G and 30-G sharp beveled needles. For each gauge, volume of drop delivered was determined for standard sharp beveled tip, blunt tip, and after breaking off of the sharp needle from the hub. The purpose of this study was to determine impact of needle gauge, type, and orientation on average volume of drop dispensed.įive needle gauges (22G, 23G, 25G, 27G, and 30G) were examined. ![]()
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