부산대학교 도서관

So much has been said of the danger from blowing air into the antrum after puncture, especially if any force is required and because one finds the natural ostium closed by swelling or polypoid tissue in so many cases, that I have devised an instrument for such use. The instrument is shown in the accompanying illustration.As I was satisfied with a needle the size and shape of the Lichwitz needle and as I so often failed to get air in or out and yet was positive it was in the antrum, its presence often being confirmed by the roentgen ray, I conceived the idea that a double channel within the needle would allow the return of air or fluid in almost any case. It would almost eliminate any possibility of causing emphysema or of blowing pus into overlying soft tissues in case the needle was not in the