Surgery – Respiratory method or device – Respiratory gas supply means enters mouth or tracheotomy...
Patent
1986-06-27
1988-09-13
Coven, Edward M.
Surgery
Respiratory method or device
Respiratory gas supply means enters mouth or tracheotomy...
12820524, A61M 1600
Patent
active
047701706
ABSTRACT:
A cuff regulator for an endotracheal-tube cuff comprising a first chamber connected to a pressurized gas supply source, and a second chamber connected to the first chamber through a pressure regulating valve and having an opening connected to a cuff of the cuffed endotracheal-tube. An orifice open to the external environment is provided in a part of a gas conduit between the second chamber and the cuff. A third chamber is also provided having the same pressure as that of the environment in which the cuff is existent. A valve driving apparatus drives the pressure regulating valve in response to the pressure difference between the third chamber and the second chamber, and a pressure setting device sets a desired cuff pressure at which opening and closing operations of the pressure regulating valve are actuated. With such construction, gas having a pressure higher than the desired cuff pressure is supplied from the pressurized gas supply source to the first chamber, and the cuff pressure is maintained at the desired cuff pressure set by the pressure setting device while the gas is slowly discharged toward the external environment through the orifice.
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Japanese Journal of Medical Instrumentation, vol. 51, Suppl. 1981, pp. 190-192, "72. Apparatus for Controlling Cuff Pressure during Nitrous Oxide-Oxygen Anesthesia."
Sapporo Ishi, (Medical Journal), 50(5), 1981, pp. 363-371, "Changes in Intra- and Lateral-Cuff Pressure During Nitrous Oxide Anesthesia and Clinical Evaluation of a New Cuff Pressure Regulator".
Hasegawa Toshihisa
Sato Toru
Coven Edward M.
Reichle K. M.
Tottori University
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