US5778872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial ventilation system and methods of controlling carbon dioxide rebreathing
Assignee: Ambu AS
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Filing: 1996-11-18
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Granted: 1998-07-14
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Expires: 2016-11-18
Abstract
Abstract A method for providing assisted ventilation which avoids hypoxia and hypocapnia is disclosed, in which a predetermined dead space in an assisted ventilation system is provided external to the patient. The method may also be used to create normocapnia or moderate hypercapnia without causing hypoxia during assisted ventilation. Preferably, hypoxia can be avoided while inducing and/or maintaining the arterial carbon dioxide tension between about 35 and 95 mmHg. Dead space volumes as small as 10 ml and exceeding 150 ml are utilized in the method. An improved proximal terminal, tubular attachments, and coaxial filter are disclosed, which are safer and less expensive to use than prior art unilimb assisted ventilation systems; the devices of the present invention also reduce medical wastes in comparison to prior art assisted ventilation systems. An interface is provided, which incorporates the proximal terminal and other functional devices, to which tubular respiratory conduits of predetermined and/or adjustable dead space volumes can be connected.
Inventors
- 👤 Atsuo F. Fukunaga
- 👤 Blanca M. Fukunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:34
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/105; A61M16/1055; A61M16/08; A61M2230/00; A61M2230/40; A61M2230/43; A61M2230/432; A61M2230/435; Y; Y10; Y10S; Y10S128/00; Y10S128/911; Y10S128/912; Y10S128/914; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
280 words
A system for use in mammals to provide thereto and exhaust therefrom respiratory gases, comprising: a first breathing conduit having a proximal end and a distal end for providing and exhausting respiratory gases from a mammal, said first breathing conduit being flexible, interface means comprising a proximal terminal operably connected to said proximal end of said first breathing conduit, means for preventing biological contamination within said first breathing conduit from communication with said interface means, said means for preventing biological contamination being operably connected to or disposed within said proximal end of said first breathing conduit, said proximal terminal comprising a rigid housing, said housing comprising an inspiratory gas input, an expiratory gas outlet, and a first respiratory port, said first respiratory port being in fluid communication through said means for preventing biological contamination with said first breathing conduit when said breathing conduit is in operable connection with said interface, said proximal terminal further comprising a rigid outer tube, and a rigid inner tube, said outer tube and inner tube each having a first end and a second end, said inner tube being at least partially disposed within said outer tube, said second end of said inner tube being disposed within said outer tube, said outer tube being connected at its second end to said first respiratory port, and said first end of one of said tubes being connected to said inspiratory gas input, and said first end of one of said tubes being connected to said exhaust outlet, the outer diameter of said inner tube being smaller than the inner diameter of said outer tube, wherein said first breathing conduit is detachable from said interface for disposal or sterilization.
Claim 2
Independent Claim
280 words
A system for use in mammals to provide thereto and exhaust therefrom respiratory gases, comprising: a first breathing conduit having a proximal end and a distal end for providing and exhausting respiratory gases from a mammal, said first breathing conduit being flexible, interface means comprising a proximal terminal operably connected to said proximal end of said first breathing conduit, means for preventing biological contamination within said first breathing conduit from communication with said interface means, said means for preventing biological contamination being operably connected to or disposed within said proximal end of said first breathing conduit, said proximal terminal comprising a rigid housing, said housing comprising an inspiratory gas input, an expiratory gas outlet, and a first respiratory port, said first respiratory port being in fluid communication through said means for preventing biological contamination with said first breathing conduit when said breathing conduit is in operable connection with said interface, said proximal terminal further comprising a rigid outer tube, and a rigid inner tube, said outer tube and inner tube each having a first end and a second end, said inner tube being at least partially disposed within said outer tube, said second end of said inner tube being disposed within said outer tube, said outer tube being connected at its second end to said first respiratory port, and said first end of one of said tubes being connected to said inspiratory gas input, and said first end of one of said tubes being connected to said exhaust outlet, the outer diameter of said inner tube being smaller than the inner diameter of said outer tube, wherein said first breathing conduit is detachable from said interface for disposal or sterilization.
Claim 3
Dependent Claim
152 words
The device of claim 1, wherein said proximal terminal further comprises a second respiratory port, said second respiratory port being of smaller diameter than said first respiratory port, and said inner tube first end forms said second respiratory port, said system further comprising a second breathing conduit detachable from said interface for disposal or sterilization, said second breathing conduit having a distal end and a proximal end, said second breathing conduit being of smaller diameter than said first breathing conduit, wherein said proximal end of said second breathing conduit can be placed in operable connection with said second respiratory port through said means for preventing biological contamination, wherein, when said second breathing conduit is operably connected to said second respiratory port and said first breathing conduit is connected to said first respiratory port, said distal end of said second breathing conduit is within, and in fluid communication with, said first breathing conduit.
Claim 4
Dependent Claim
56 words
The device of claim 2, wherein a dead space is formed between said distal end of said first breathing conduit and said distal end of said second breathing conduit when said conduits are operably connected to said interface, wherein said dead space size can be altered by use of a second breathing conduit of differing lengths.
Claim 5
Dependent Claim
63 words
The device of claim 2, wherein a dead space is formed between said distal end of said first breathing conduit and said distal end of said second breathing conduit when said conduits are operably connected to said interface, and wherein the length of said first breathing conduit is extendable, whereby said dead space size can be altered by extending said first breathing conduit.
Claim 6
Dependent Claim
53 words
The device of claim 2, wherein said interface further comprises at least one functional device in operable connection with at least one of said first respiratory port and said second respiratory port, said at least one functional device selected from the group consisting of a respiration monitoring module, and a respiration control module.
Claim 7
Dependent Claim
67 words
The device of claim 2, wherein said interface further comprises at least one functional device in operable connection with at least one of said first respiratory port and said second respiratory port, said at least one functional device selected from the group consisting of an oxygen analyzer, a carbon dioxide capnometer, a pressure manometer, a carbon dioxide level control, an oxygen level control, and a filter device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-13 | 2002-01-12 | 2002-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-13 | 2006-01-12 | 2006-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-13 | 2010-01-12 | 2010-07-14 | $7700.00 | Window Closed / Lapsed |