Abstract: A tracheostomy device for insertion into the trachea for ventilation has inner and outer cannulae. A sealing cuff on the inner cannula forms a seal with a wall of the trachea. A housing connects to the inner and outer cannulae and communicates with an outside air source. The outer cannula is provided with a fenestration between the cuff and the patient's vocal cords. The inner cannula is slidable within the outer cannula, the two being connected by a spring and bellows arrangement. The inner cannula slides down to close the fenestration during inhalation and slides up to open the fenestration upon exhalation of the air from the patient's lungs.

Abstract: A tracheostomy device for insertion into the trachea for ventilation has first and second cannulae. A sealing cuff on the first cannula forms a seal with a wall of the trachea. A housing attaches to the first and second cannulae and communicates with an outside air source. The housing contains a dual valve system including a swingable check valve connected by a toggle link to a plug valve. The check valve and plug valve move together from a first position in which the plug valve closes the second cannula preventing air from escaping to an upper portion of the trachea and the check valve is away from a housing aperture allowing air to flow from the air source through the housing, the first cannula, a lower portion of the trachea and to the lungs.

Abstract: A chair structure comprising a one-piece, loop-shaped tubular frame having a pair of leg structures depending from and supporting the frame. A mesh body support member including a back and seat portion having a plurality of relatively closely interwoven metallic strands, with the strand ends at side and end marginal portions securely connected to the frame. The support member is formed of resiliently flexible mesh material whereby the same elastically yields to the weight of a user, such that the chair back and seat has a small curvature and an attractive appearance and yields tending to conform comfortably to the seated shape of the user.