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It is always disconcerting to the physician and uncomfortable to the patient to have an intravenous needle come out of the vein during infusions or transfusions. This is particularly true in pediatrie cases where so much movement of the patient is seen. A simple locking device to maintain a needle in the vein is shown in the figure, A. The device consists of two parts, one a collar that slips over the hub of the needle, and the other a spring clip that fits in the upper part of the collar above the needle. The spring clip has four small prongs on the end that are sharp enough to hold in the skin but not enough to pierce the skin. A short spring clip, not shown, is made for use on short needles for scalp veins in giving transfusions to infants. The collar is firmly attached by the set screw
Bloxsom A. INTRAVENOUS NEEDLE LOCK. JAMA. 1955;158(3):181. doi:10.1001/jama.1955.02960030031009c