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United States Patent | 5,042,522 |
Corenman , et al. | August 27, 1991 |
A backflushing system for an inlet filter in an airway adapter in a gas flow sampling and analyzing system includes a back flush fluid supply conduit and sampling conduit connected to the airway adapter by a single coupling element. Flow of back flush fluid causes material blocking the filter to be washed away into the respiratory conduit for disposal. Flow of backflush fluid is restricted to one way flow through the backflush conduit by a disk shaped valve member mounted in the air way adapter.
Inventors: | Corenman; James E. (Oakland, CA), Goldberger; Daniel S. (San Francisco, CA), Richards; Edward M. (Pleasanton, CA), Rojas; Emil P. (Los Gatos, CA), Braig; James R. (Hayward, CA), Gallup; David A. (Union City, CA) |
Assignee: |
Nellcor, Inc.
(Hayward,
CA)
|
Appl. No.: | 07/458,971 |
Filed: | January 25, 1990 |
Application Number | Filing Date | Patent Number | Issue Date | ||
101931 | Sep., 1987 | 4907166 | |||
Current U.S. Class: | 137/239 ; 137/550; 55/302; 600/532 |
Current International Class: | A61B 5/08 (20060101); A61B 5/083 (20060101); G01N 21/31 (20060101); G01N 21/35 (20060101); B01D 046/04 () |
Field of Search: | 137/239,544,550 55/302 128/719 |
3705478 | December 1972 | Vaneldik et al. |
4456014 | June 1984 | Buck et al. |
4679573 | July 1987 | Parnoff et al. |