Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1997-03-14
1998-06-30
Asher, Kimberly L.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820419, 137908, 25112901, 2511291, 2513351, 2513352, A61M 1600, A62B 700, A62B 904, F16K 108
Patent
active
057718849
ABSTRACT:
The exhalation valve includes a valve housing with a valve seat having an annular shoulder, and a valve poppet having a face with a corresponding annular groove. A soft flexible diaphragm seal disposed between the face of the valve poppet and the valve seat provides a suspended soft seal, ensuring perpendicularity in the valve seal for improved accuracy of valve operation. An annular permanent magnet and an annular magnetic ring are disposed around and spaced apart from a magnetic body to define an air gap in which an electromagnetic coil is disposed. The electromagnetic coil is connected to a control mechanism by a flexible circuit connector that is sufficiently slack that provides minimal force transverse to the longitudinal axis of the valve. An assembly is provided for adjusting uniformity of the air gap and of concentricity of magnetic body and shaft of the poppet, and the control mechanism adjusts the current supplied to the electromagnetic coil, compensating for changes in the magnetic field strength of the valve due to changes in temperature, velocity of the valve poppet, and patient airway pressure. A flexible diaphragm is also connected between the valve poppet and magnetic body to prevent cross-contamination between the exhalation valve and breathing gas.
REFERENCES:
patent: 4624282 (1986-11-01), Fargo
patent: 4930541 (1990-06-01), Solberg
patent: 5072729 (1991-12-01), DeVries
patent: 5108070 (1992-04-01), Tominaga
patent: 5127400 (1992-07-01), DeVries et al.
patent: 5339807 (1994-08-01), Carter
patent: 5669596 (1997-09-01), Yoshikawa et al.
Van Wagner Bruce
Winter David P.
Yarnall Stephen T.
Asher Kimberly L.
Nellcor Puritan Bennett Incorporated
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