Some years ago Professor Judson Daland adopted, for the purpose of facilitating gastric lavage and test-meal removal, two large open-mouth bottles of more than a liter capacity, a plain gastric tube and a double action Davidson bulb. With this arrangement, aided by an assistant, it was possible to obtain a sample of gastric contents in considerably less than a minute and to immediately follow this procedure with lavage and inflation if desired. This arrangement while marking a distinct advance over other methods in common use, has the decided drawback that its employment required the attendance of an assistant; the complicated nature of the apparatus requiring a second pair of hands to manage bottles and change tube connections during the passage of the tube.
To overcome this difficulty and to render this method more universal in its employment we have devised the reversing valve about to be described. This device is
DEVER FJ, FAUGHT FA. A DEVICE FOR FACILITATING TEST-MEAL REMOVAL AND GASTRIC LAVAGE.. JAMA. 1908;LI(8):673–674. doi:10.1001/jama.1908.25410080039003a