METHOD AND APPARATUS FOR EFFECTING HYPERTHERMIC TREATMENT

摘要

An assembly for use in establishing percutaneous communication with a flow passage of a totally subcutaneous implant. Within said assembly is an elongated percutaneous cannula having a subcutaneous end portion and an extracorporeal end portion, said subcutaneous end portion having an exterior peripheral cross-sectional configuration elongated in one direction with sharp points defining opposite ends thereof in the direction of elongation. The cannula has an interior passage extending from the extracorporeal end portion thereof to the extremity of said subcutaneous end portion and an elongated trocar including a pointed end. The trocar has an exterior periphery extending from said pointed end of a shape to enable said trocar (1) to be inserted pointed end first through said interior passage of said cannula in a direction and to an extent sufficient to position the pointed end thereof outwardly of the extremity of said subcutaneous end portion thereof and (2) to be withdrawn from said interior passage in the opposite direction. The foregoing arrangement alleviates the problems of infection and bloodclotting which can arise in the use of exteriorized shunts for connecting the extracorporeal blood flow circuit with the blood system of the patient.