Self-contained breathing system
First Claim
Patent Images
1. A breathing apparatus comprising:
- a chassis defining an passageway for a breathable gas, said chassis further comprising a first inlet for receiving breathable gas from a self-contained source of breathing gas, a second inlet for receiving ambient air, and a first outlet for delivering breathable gas to a user;
a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said airflow reservoir;
a main filter assembly positioned between said second inlet and said airflow reservoir for removing contaminants from said ambient air.
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Abstract
A breathing apparatus is operable in self-contained and filtered modes of operation. In the self-contained mode of operation, a breathable gas is delivered to a user from a self-contained source of breathing gas. In a second, filtered mode of operation, a suction source draws ambient air through a filter removing contaminants and delivers filtered ambient air to the user. A method of delivering air to a subject is also provided.
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Citations
66 Claims
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1. A breathing apparatus comprising:
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a chassis defining an passageway for a breathable gas, said chassis further comprising a first inlet for receiving breathable gas from a self-contained source of breathing gas, a second inlet for receiving ambient air, and a first outlet for delivering breathable gas to a user;
a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said airflow reservoir;
a main filter assembly positioned between said second inlet and said airflow reservoir for removing contaminants from said ambient air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A method for providing breathable gas to a subject, comprising:
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providing a breathing apparatus for selectively delivering a breathable gas from a pressurized source of breathable gas and a source of filtered ambient air;
delivering a flow of breathable gas to the subject from the pressurized source when the pressurized source is selected; and
delivering a flow of filtered ambient air when the source of filtered ambient air is selected. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A breathing hose assembly for delivering a breathing gas to a user, comprising:
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an inner perforated hose extending from a first end of the breathing hose assembly to a second end of the breathing hose assembly;
an outer flexible bag surrounding the inner perforated hose, the outer flexible bag being inflatable to hold a volume of air for subsequent delivery to the user. - View Dependent Claims (64, 65, 66)
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Specification