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Finding the usual drop tube for saline infusions very delicate in construction, and the nurse having broken our entire supply of them, we were confronted with the necessity of constructing an apparatus that would indicate the rate of flow for a saline infusion which a serious case demanded immediately.
We found that an ordinary medicine dropper, filed off about an inch above the pointed end, will fit snugly into the end of an ordinary piece of three-eighths inch glass tubing. The rubber tubing is then drawn over them both, leaving the end of the medicine dropper in view within the glass tubing. Greater security is obtained by welding the two together with a flame, but this is not necessary.
Pomeroy ES. A SIMPLE INFUSION DROP TUBE. JAMA. 1919;72(14):994. doi:10.1001/jama.1919.26110140002011a