Abstract: Disclosed herein is an improved tracheal tube which accommodates and follows the axial lengthening, shortening and translating movement of the trachea in actions such as breathing and swallowing, so as to minimize relative movement between the trachea and the tube where the tube inner end engages and bears against the trachea. In preferred form, the tube has two or more rigid, longitudinally spaced tubular support sections, including its inner end portion and an outer portion which are fixed in position with respect to the patient. The support sections support radially and connect at least one filmy tubular collapsible section between them. The collapsible section folds and unfolds on itself in the axial direction virtually without resistance, in response to movement of the trachea which tends to shorten or lengthen the distance between the support sections.

Abstract: A respiratory exercise device for measuring the volume of air inhaled by the user, the device comprising an essentially rigid transparent container having an inhalation tube by means of which air is evacuated from the container, the container having an expansible member in communication with the outside air which expands within the container as the air in the container is evacuated, calibrated indicia being provided which measures the extent to which the expansible member is expanded, thereby indicating the volume of air withdrawn from the container.

Abstract: A collapsible respiratory exercising device for measuring the volume of air inhaled by the user. The device comprises a rigid upper plate, an orifice through the plate, an inhalation tube connected to the orifice, a tubular bellows attached beneath the plate and in communication with the orifice and tube, a lower plate attached to the lowermost end of the bellows which has sufficient mass to cause the bellows to fully expand, and measuring means with calibrated indicia attached to the upper plate for determining the change in volume of the bellows after inhalation, thereby indicating the amount of air that has been inhaled.