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 Title: |
US4077404:
Breathing equipment such as resuscitators
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Elam, James O.; Chicago, IL
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| Assignee: |
H. B. W. Medical Instruments Manufacturing Company, Inc., Arcadia, CA
other patents from H. B. W. MEDICAL INSTRUMENTS MANUFACTURING COMPANY, INC. (244865) (approx. 1)
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| Published / Filed: |
1978-03-07
/ 1976-10-19
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| Application Number: |
US1976000733755
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| IPC Code: |
Advanced:
A61M 16/20;
A62B 9/02;
A61M 16/00;
Core:
A62B 9/00;
more...
IPC-7:
A61M 16/00;
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| ECLA Code: |
A61M16/20B; A62B9/02; K61M16/00M11;
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| U.S. Class: |
Current:
128/204.28;
128/205.13;
128/205.24;
137/102;
Original:
128/145.8;
137/102;
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| Field of Search: |
128/145.5,145.6,145.7,145.8,188,203,142 R,142.2
137/102,517
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| Priority Number: |
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| Abstract: |
Breathing equipment, for instance a resuscitator, adapted to supply ambient air or alternatively oxygen from a pressurized source, the equipment including non-rebreathing valve mechanism having inspiration and expiration ports, and arranged to assure automatic operation to effect oxygen "blow-by" under conditions of operation tending to close the expiration port, and thereby prevent undesirable build-up of pressure in the patient's lungs.
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| Attorney, Agent or Firm: |
Synnestvedt & Lechner ;
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| Primary / Asst. Examiners: |
Michell, Robert W.; Recla, Henry J.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Parent Case: |
CROSS REFERENCE
The present application is a continuation-in-part of my application Ser. No. 614,030, filed now U.S. Pat. No. 4,037,595.
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| Family: |
Show 4 known family members
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First Claim:
Show all 4 claims |
I claim:
1. A resuscitator valve mechanism including a valve chamber having opposed end walls spaced a predetermined distance from each other and joined by side walls, opposed inspiration and expiration ports in said end walls, respectively each having a valve seat surrounding the port, said valve seats facing toward each other, and the chamber having a port in a side wall of said chamber between said opposed end walls for communication with the patient's lungs, a valve in said chamber having opposed spherical surfaces facing away from each other, said surfaces being disposed on the longitudinal axis of said valve and being spaced a predetermined distance from each other, and presented toward the valve seats at the opposite ends of the chamber, the valve having clearance adjacent the side walls of the chamber to allow for passage of gas and being movable in opposite directions to engage either of the valve seats and close one or the other of the opposed ports, a spring urging the valve away from the expiration port seat, and the valve mechanism having means providing for connection of a source of pressurized inspiration gas and for directing such pressurized gas to the inspiration port, the valve being movable away from the inspiration valve seat under the influence of the pressurized gas, the spring being a helical coil compression spring with one end seated against an end of the valve chamber around the expiration port and the other end presented toward the valve for engagement therewith, the length of said expiration port seat being greater than the length of said spring when fully compressed such that said spring is deflectable sufficiently to provide for engagement of the valve with the expiration port seat and thus close the expiration port, the length of the spring when fully expanded being less than the difference of the predetermined distance which said end walls are spaced and the longitudinal distance which said spherical surfaces are spaced whereby, the length of the spring is less than that required to urge the valve into engagement with the inspiration port seat, and the valve being of low mass and its motion being unquided except for the action of said spring and of gas flow through the valve chamber, thereby providing for substantially unrestrained displacement of the valve from the inspiration valve seat under the influence of even weak spontaneous inspirational effort by the patient.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 154 U.S. patent(s) that reference this one
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