Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1990-08-03
1991-05-28
Burr, Edgar S.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820525, 12820621, 12820628, A61M 1606
Patent
active
050185195
ABSTRACT:
A mask for administering gas to a patient in which an inner cup-shaped wall fits over the nose of a patient and engages the face of the patient. An outer wall of the mask is detachably secured to and spaced from the inner wall to form an exhaust passage for the removal of gas exhaled by the patient. A floating disc valve is opened and closed by the exhaling and inhaling of the patient to control the flow of exhaust gas from the gas chamber of the inner wall to the exhaust passage. A valve seat of the floating disc valve is part of the inner wall and a flexible floating valve disc of the floating disc valve is attached to the valve seat. Formed in the peripheral edge of the inner wall is a recessed, V-shaped section to accommodate the middle of the nose and to form a seal against gas leakage.
REFERENCES:
patent: 1632449 (1927-06-01), McKesson
patent: 2888012 (1959-05-01), Larson
patent: 3395701 (1968-08-01), Bartlett, Jr. et al.
patent: 3721239 (1973-03-01), Myers
patent: 4015598 (1977-04-01), Brown
patent: 4151843 (1979-05-01), Brekke et al.
patent: 4219020 (1980-08-01), Czajka
patent: 4312339 (1982-01-01), Thompson, Sr.
patent: 4337767 (1982-06-01), Yahata
patent: 4794921 (1989-01-01), Lindkvist
patent: 4807617 (1989-02-01), Nesti
Brochure published by MDT Corporation entitled The Reasons for Using the MDT/McKesson Scavenging Mask are Perfectly Clear.
Burr Edgar S.
Raciti Eric P.
Wiseman Jack M.
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