Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1982-05-24
1984-02-14
Recla, Henry J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820428, 12820512, 417 45, A62B 710
Patent
active
044309953
ABSTRACT:
The present invention relates to an improved air-purifying device for respirators of the positive pressure type.
The device comprises an expandable chamber having an outlet for connection to a facepiece, for example, a face mask, and an inlet connected to a pump for drawing ambient air into the device through a filter and pumping it into the chamber. In use, the wearer of the face mask draws air from the chamber and that air is replenished by operation of the pump.
Apparatus is provided for sensing the degree of expansion of the expandable chamber and is coupled with a device for varying the power supplied to the pump so that the pump means supplies only sufficient filtered air to maintain the chamber inflated. A bias is provided on the chamber, advantageously coupled with the sensing apparatus for maintaining a positive pressure in the chamber.
The air-purifying device allows close control of the amount of air passing through the respirator so as to substantially reduce the amount of air which is filtered but unbreathed to extend the life of the filter.
REFERENCES:
patent: 855046 (1907-05-01), Cousans
patent: 1308599 (1919-07-01), Luchs
patent: 2830580 (1958-04-01), Saklad et al.
patent: 3501899 (1970-03-01), Allen
patent: 3863630 (1975-02-01), Cavallo
patent: 4233972 (1980-11-01), Hauff et al.
patent: 4364384 (1982-12-01), Warncke et al.
LandOfFree
Power assisted air-purifying respirators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power assisted air-purifying respirators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power assisted air-purifying respirators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2369776