Abstract: A cannula introducer for use in open heart surgery and provided for locating through an incision in the heart lining, the introducer includes a cylindrical member, formed at its upper end into a pair of tubular-like guide means, while its lower end is formed into confinement, having a pair of apertures therethrough, and through which the cannula are directed for insertion into the vena cava during the application of a heart-lung machine during a surgical procedure, and through which the cannulas may be introduced and guided into the heart, and more specifically its right atrium, and further into the superior and inferior vena cavae in preparation and during open heart and related type surgical operations, requiring the application of two separate cannulas, at the mid-point of the introducer may be located an integral beaded portion therearound, to facilitate the adherence and tying of the wall of the right atrium to the introducer while it is located within the same during a surgical procedure.