Respiratory mask

Claim 1

A RESPIRATORY BREATHING MASK ADAPTED TO CARRY THE EXHALED BREATH OF THE USER FOR DISCHARGE AT A LOCATION REMOTE FROM THE USER SUCH AS TO PRESERVE STERILITY IN A SURGICAL OPERATING AREA, COMPRISING A FACE MASK HAVING A BODY PORTION DEFINING A BREATHING CHAMBER ADAPTED TO COVER ONLY THE NOSE AND MOUTH AND SURROUNDING FACIAL AREAS OF THE USER, PORT MEANS IN SAID BODY PORTION FOR PASSAGE OF AMBIENT AIR INTO SAID BREATHING CHAMBER, SAID PORT MEANS COMMUNICATING WITH THE INTERIOR OF SAID MASK IN THE UPPER PORTION OF SAID BREATHING CHAMBER TO AVOID DIRECT EXHALATION FROM THE NOSE OR MOUTH AGAINST SAID PORT MEANS, RESTRICTING MEANS FOR IMPEDING GAS FLOW BETWEEN SAID BREATHING CHAMBER AND THE EXTERIOR OF SAID MASK THROUGH SAID PORT MEANS, A TUBE CONNECTED INTO THE LOWER REGION OF SAID CHAMBER FOR CARRYING A FLOW OF GAS FROM SAID CHAMBER TO A LOCATION REMOTE FROM THE MASK, AND SUCTION MEANS OPERATIVELY CONNECTED WITH SAID TUBE TO INDUCE A SLIGHT NEGATIVE PRESSURE IN SAID CHAMBER WITH RESPECT TO AMBIENT AIR PRESSURE SUFFICIENT TO WITHDRAW NORMAL EXHALATION FROM SAID CHAMBER THROUGH SAID TUBE, SAID RESTRICTING MEANS PROVIDING FOR SUFFICIENT INFLOW OF AMBIENT AIR TO SAID CHAMBER TO SUPPORT NORMAL BREATHING.