EP 0413555 A1 19910220 - Positive pressure breathing apparatus.
Title (en)
Positive pressure breathing apparatus.
Title (de)
Überdruckatemgerät.
Title (fr)
Appareil respiratoire à surpression.
Publication
Application
Priority
GB 8918901 A 19890818
Abstract (en)
In positive pressure breathing apparatus comprising a face mask 1 having a fan 2 driven by a motor 3 powered by an electric battery 4 to maintain a pressure above atmospheric pressure within the face mask 1, a pressure sensitive electronic module 8, which comprises a pressure transducer and a control circuit including a pulse generator, senses the pressure within the interior of the face mask 1 and provides D.C. pulses from the electric battery 4 to the fan motor 3. The width of the pulses provided by the pressure sensitive electronic module 8 varies in accordance with the instantaneous pressure sensed within the face mask 1 so as to cause the fan 2 to supply air to the interior of face mask 1 at a rate to meet the requirements of the wearer while maintaining a substantially constant positive pressure within the interior of the face mask 1.
IPC 1-7
IPC 8 full level
A62B 18/00 (2006.01)
CPC (source: EP)
A62B 18/006 (2013.01)
Citation (search report)
- [Y] GB 2032284 A 19800508 - RACAL SAFETY LTD
- [Y] US 4856078 A 19890808 - KONOPKA JOHN G [US]
- [A] EP 0066451 A1 19821208 - RACAL SAFETY LTD [GB]
- [A] US 4765326 A 19880823 - PIEPER WENDELL J [US]
Designated contracting state (EPC)
DE FR IT SE
DOCDB simple family (publication)
EP 0413555 A1 19910220; GB 2235136 A 19910227; GB 8918901 D0 19890927
DOCDB simple family (application)
EP 90308926 A 19900814; GB 8918901 A 19890818