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To the Editor:—
I have examined 226 hypodermic needles and found that 152, or 67%, are definitely defective, so much so that they would not meet the federal specification requirements for hypodermic needles and, in my opinion, present a therapeutic hazard.The defects consist of deposits of metal powder in the lumen, metal slivers extending from the inner edge into the lumen, a very rough interior surface of the lumen, and rough surface of the point from grinding. As a rule, needles are defective in two or more of these respects. The rough interior seems to be a major cause of excess deposits of metal powder and wire edges. All brands showed a large percentage of failures, some more than others. Below is a breakdown of the failures of the brands we have examined under a 30 power stereo microscope for (1) powdered metal deposits, (2) wire edges, (3) metal
Palmer DH. DEFECTIVE HYPODERMIC NEEDLES. JAMA. 1952;149(3):299. doi:10.1001/jama.1952.02930200085029