Surgery – Respiratory method or device – Respiratory gas supply means enters mouth or tracheotomy...
Patent
1984-11-23
1986-06-24
Howell, Kyle L.
Surgery
Respiratory method or device
Respiratory gas supply means enters mouth or tracheotomy...
128911, 623 9, A61M 1600
Patent
active
045962480
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. The two valves move to a second position as exhaled air moves the check valve into contact with the housing to close the housing aperture and the plug valve is moved away from the second cannula, forcing air to flow through the second cannula, to the upper trachea and through the patient's larynx, thereby permitting speech. Alternatively, an outer cannula is provided with a fenestration between the cuff and the patient's vocal cords. An 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.
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Howell Kyle L.
Smith Ruth S.
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