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Valves
| Details |
Inventors: Pfitzner, John;
Assignee:
Primary Examiner: Cline; William R.
Assistant Examiner: Spiegel; H. Jay
Attorney, Agent or Firm: Brisebois & Kruger
A valve for directing flow of breath to and from a patient has a first port adapted to be connected to a source of breath, a second port adapted to be connected to a patient and first obturating means in the form of a diaphragm for controlling flow between the first and second ports. A passage in the valve is in continuous communication with the second port through apertures in the diaphragm and second obturating means formed by a further diaphragm controls flow from the second port through the passage. The further diaphragm is arranged to prevent flow through the passage when the first-mentioned diaphragm is allowing flow between the first and second ports. |
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DETAILED DESCRIPTION I claim: 1.
A valve for directing flow of breath to and from a patient, having a first port adapted to be connected to a source of breath, a second port adapted to be connected to a patient, a third port adapted to convey exhaled breath from the valve, a passage between said second and third ports, a first obturating member for controlling flow between said first and second ports, said obturating member comprising a diaphragm secured at its periphery and having an intact outer portion ensuring unidirectional flow from said first port to said second port and a central apertured portion for allowing continuous communication between said second port and said passage, and a second obturating member for controlling flow between said passage and said third port and arranged to prevent flow through said passage when said first obturating member allows flow between said first and second ports.
2.
A valve as claimed in claim 1, wherein the central apertured portion is provided with circumferentially spaced apart apertures.
3.
A valve for directing flow of breath to and from a patient, having a first port adapted to be connected to a source of breath, a second port adapted to be connected to a patient, a third port adapted to convey exhaled breath from the valve, a passage between said second and third ports, a first obturating member for controlling flow between said first and second ports, through which obturating member said second port is in continuous communication with said passage, and a second obturating member for controlling flow between said passage and said third port and arranged to prevent flow through said passage when said first obturating member allows flow between said first and second ports, said second obturating member comprising a diaphragm, one side of which is arranged to be subjected, in use, to the pressure of flow through the first port to urge said diaphragm into a closed position to prevent flow from said passage, the pressure of which is arranged to act on a first portion of the other side of said diaphragm, a second portion of said other side being subjected to pressure through the third port
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