A perforated endotracheal connection piece.

Basically this is a Rowbotham type connection piece with elongated stem in which the perforations have been made. A rotating inner drum with matching perforations allows partial or complete occlusion of the holes when necessary. The internal diameter of the stem is the same as in a standard Rowbotham piece. I have used the connection in clinical practice for over twelve months and have found it very satisfactory both in children and adults. W. W. Mapleson, Ph.D., the physicist of the Department of Anaesthetics, Welsh National School of Medicine, Cardiff, has kindly investigated the physical resistance offered by the instrument (perforations open) and his report is as follows: