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One may easily imagine that the edge of a piece of common tin pressed against the skin would make a tight joint with the skin, and so it does. So little pressure is needed that no discomfort is occasioned. It may be that this principle will serve in various situations as an aid to irrigation, as it certainly did in one instance for me in which a patient could not conveniently be moved from his bed. As is usual the bed sagged somewhat, and when it was necessary to irrigate sinuses in the patient's arm, which was fixed in vertical extension, I had visions of a rubber pad becoming a lake, with the subsequent necessity of changing the bedding, and so forth. To prevent this the device here illustrated was satisfactorily employed. The apparatus was placed just at the lowest edge of the discharging sinus and carried away the returning water
Andrews CG. AN IRRIGATION ACCESSORY. JAMA. 1929;92(10):801. doi:10.1001/jama.1929.92700360004010d