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After repeated and increasing trouble with irritated, inflamed and infected arms due to the existing forms of vaccination shield, the idea of what a vaccination shield should be has, during the course of the last ten thousand vaccinations, been gradually evolved, until the form described below, and shown in the illustration has been reached, and the writer feels that he has produced a shield which will meet all the conditions properly imposed upon such an important accessory to a perfect vaccination. A shield may be a source of comfort, protection and satisfaction, or it may be productive of distress, irritation and even infection if not suitable. The objections urged against the present forms in use have been obviated in that described below.
The shield is made of aluminum, 6 centimeters in diameter to the outer edge of its flange, which latter is curved so that it presents no sharp edges
FRANKLIN CP. VACCINATION SHIELD.. JAMA. 1901;XXXVII(25):1691. doi:10.1001/jama.1901.62470510036015a