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Sterile solutions are often put into carefully sterilized bottles, closed by sterile stoppers and then set away. By the time the solutions are to be used dust has collected on the lips of the bottles and in pouring out the contents the germs are washed off and the solutions are no longer sterile. Wiping the top of the bottle, at best, removes only part of the germs and drops the rest of them directly into the bottle. Then the stopper is laid down on some unsterile surface and, loaded with microorganisms, is returned to the bottle.
To obviate this I have devised a simple inexpensive device, so simple, in fact, that I hesitate to present it. From a piece of heavy rubber sheeting (that from a hotwater bottle answers best) cut a round piece, of such size that when placed over the mouth of the bottle the edges project somewhat. Then cut a small round hole in the center, of such size that the rubber
BETTMAN AG. A SIMPLE AND INEXPENSIVE DEVICE TO PREVENT THE CONTAMINATION OF STERILE SOLUTIONS. JAMA. 1910;55(2):127. doi:10.1001/jama.1910.04330020031014
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