Abstract: An improved flexible catheter for suctioning of tracheobronchial passages. In one form, the catheter is provided with side openings which are elongated in a direction generally parallel to the end surface of the tubular member, and are located adjacent thereto. The catheter may be provided with a beveled tip, in which case a second form of the invention is advantageously provided with side openings which are elongated longitudinally of the catheter, and located adjacent the top portion thereof. In a third form of the invention, the catheter has triangular side openings which combine the advantages of both of the foregoing forms of the invention. Effectiveness of the catheter is further improved by restricting the area of the end openings so that the total area of the side openings is from 1.5 to 6 times the area of the end opening. Longitudinal slots along the outer surface of the catheter, adjacent to the side holes relieve the suction and reduce tissue trauma when openings are blocked.