Respirator
First Claim
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1. A rescue type breathing apparatus comprising:
- a hood adapted to enclose a user'"'"'s head and neck, said hood being at least substantially made of a flexible material and including an elastic neck seal means for allowing gas from the inside of said hood to escape to the outside when the pressure in said hood exceeds the ambient gas pressure and substantially preventing leakage of the ambient gas into said hood when the ambient gas pressure exceeds the pressure in said hood;
a face mask mounted inside said hood, said face mask including gas communication means for allowing passage of breathing gas between said hood and said face mask;
gas supply means connected to said face mask for supplying breathing gas to said face mask;
controlling means responsive to changes in gas pressure in said face mask during the inhalation and exhalation phase of a respiratory cycle of the user for allowing the flow of said breathing gas from said gas supply means to said mask during at least the first part of the inhalation phase in response to a first inhalation demand by the user;
said gas communication means including first and second regulating means responsive to changes in gas pressure in said face mask;
said first regulating means allowing passage of gas including said breathing gas from said face mask into said hood in response to exhalation and said second regulating means allowing passage of gas including said breathing gas from said hood into said face mask during the second part of said inhalation phase in response to subsequent inhalation demand by the user.
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Abstract
A rescue type breathing apparatus which includes a hood and a face mask incorporated inside the hood. During a first phase of the inhalation cycle a breathing gas is supplied to the face mask from the gas container through a bladder. After the bladder has been emptied breathing gas in a second phase of the inhalation cycle is supplied from the hood and the gas container.
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Citations
19 Claims
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1. A rescue type breathing apparatus comprising:
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a hood adapted to enclose a user'"'"'s head and neck, said hood being at least substantially made of a flexible material and including an elastic neck seal means for allowing gas from the inside of said hood to escape to the outside when the pressure in said hood exceeds the ambient gas pressure and substantially preventing leakage of the ambient gas into said hood when the ambient gas pressure exceeds the pressure in said hood; a face mask mounted inside said hood, said face mask including gas communication means for allowing passage of breathing gas between said hood and said face mask; gas supply means connected to said face mask for supplying breathing gas to said face mask; controlling means responsive to changes in gas pressure in said face mask during the inhalation and exhalation phase of a respiratory cycle of the user for allowing the flow of said breathing gas from said gas supply means to said mask during at least the first part of the inhalation phase in response to a first inhalation demand by the user; said gas communication means including first and second regulating means responsive to changes in gas pressure in said face mask; said first regulating means allowing passage of gas including said breathing gas from said face mask into said hood in response to exhalation and said second regulating means allowing passage of gas including said breathing gas from said hood into said face mask during the second part of said inhalation phase in response to subsequent inhalation demand by the user. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A rescue type respirator apparatus comprising:
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a first, expandable, resilient hood member adapted to enclose a wearer'"'"'s head, said first member including elastic neck means for sealingly engaging the hood member above the wearer'"'"'s neck and allowing gas from the inside of said hood to escape to the outside when the pressure in said hood member exceeds the ambient gas pressure and substantially preventing leakage of the ambient gas into said hood member when the ambient gas pressure exceeds the pressure in said hood member, said first member forming a first chamber; a second mask member mounted within said first chamber and configured to fit over the wearer'"'"'s face, said second mask member being provided with sealing means for sealingly engaging the wearer'"'"'s face, said second mask member forming a second chamber; means for supplying breathing gas to said second chamber during the first part of the inhalation phase of the user; means for controlling the flow of breathing gas into said second chamber; means for permitting a flow of gas from said second chamber into said first chamber during the exhalation phase of the wearer; and means for permitting the flow of a portion of gas including said breathing gas from said first chamber into said second chamber during the second subsequent part of the inhalation phase of the wearer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of supplying a breathing gas during a respiratory cycle of a person using a rescue type respirator including a sealed hood, a face mask mounted inside the hood and a breathing gas supply in communication with the face mask, said method comprising the steps of:
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supplying a first portion of gas including breathing gas from said breathing gas supply to the face mask during the first part of the inhalation phase of the person; and supplying a second portion of gas including the breathing gas from the hood to the face mask during the second part of the inhalation phase of the person. - View Dependent Claims (14)
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15. A method of supplying a breathing gas during a respiratory cycle of a person using a rescue type breathing apparatus, including a sealed hood adapted to be applied over the person'"'"'s head, a face mask mounted in the hood, a bladder or flexible reservoir connected with the face mask, a first gas flow controlling means located between said bladder or reservoir and said face mask and a second gas flow controlling means located between the hood and the face mask, said method including the steps of:
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supplying a breathing gas during a first part of the inhalation phase of the person, said step of supplying including providing a gas container connected to the bladder or flexible reservoir; delivering the gas from the gas container to the bladder or flexible reservoir; actuating the first gas flow controlling means during first part of the inhalation phase to admit the gas into the face mask from the bladder or reservoir at which time the bladder is empty; supplying breathing gas during a second part of the inhalation phase of the person by actuating the second gas flow controlling means for supplying gas from the hood into the face mask while simultaneously continuing a supply of the breathing gas from the gas container by continuing actuation of the first gas flow controlling means. - View Dependent Claims (16, 17, 18, 19)
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Specification