Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1994-03-01
1996-02-06
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820522, A62B 700
Patent
active
054889464
ABSTRACT:
An emergency breathing device has a manifold with two threaded receivers for holding compressed air cartridges and two parallel bores. A first bore holds a primary plunger. A collar on the plunger rests on a nylon seal, which is supported on a ledge between the relatively small lower bore and the larger upper bore. A drive spring surrounds an upper portion of the primary plunger and bears against the collar. A housing receives and abuts the spring, and slides an upper part of the plunger through an axial bore in the housing. Detent pins extend through radial bores in the housing. Detent springs urge the detent pins outward. The plunger has a recess which receives semi-spherical inner ends of the detent pins when the plunger is pushed upward against drive spring force. A bell-shaped cap has a bevelled lower edge and a cylindrical inner surface, which presses the detent pins inward against detent spring force. Spring fingers of a cap retainer mounted inside the cap engage a knob on the top of the housing to hold the cap on the housing. A downward-urged indicator pin extends through a central hole in the cap-and is extended upward into a pull ring by an upper end of the plunger. Pulling sharply on the ring pulls the cap from the housing and releases the detents. The drive spring drives a plunger downward, and a bevelled cutter point on the tapered lower end of the plunger punctures the compressed air cartridge. An air pressure indicator in the side of the manifold uses air pressure to slide a pressure indicator pin outward. A spring moves the pressure indicator pin inward when pressure decreases in the manifold.
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Brochure and diagrams for "EMERG: Emergency Breathing Equipment"; Lalsip, Inc. Colorado Springs, Colorado (3 pp.).
Calhoun Clifford A.
Calhoun Craig
Cave Bryan
Klein David M.
Lewis Aaron J.
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