Patent US3468312A successfully refreshed from Google Patents.
Patent US5386826A successfully refreshed from Google Patents.
US5386826A
Expired / Lapsed
US
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Tracheal tube assemblies
Assignee: University of Leeds Industrial Services Ltd
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Filing: 1991-02-15
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Granted: 1995-02-07
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Expires: 2011-02-15
Abstract
Abstract A tracheal tube assembly comprises an outer tube and an inner cannula that is insertable within and removable from the outer tube. The inner cannula has an inner surface of a flexible plastic material such as PVC to which respiratory secretions cling. The outer surface of the cannula is of a material having a lower friction than the inner surface and may be a helical filament or a continuous layer. The machine end of the inner cannula projects beyond the outer tube to form a flexible portion which is terminated with a coupling.
Inventors
- 👤 Timothy J. J. Inglis
- 👤 Michael R. Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:06
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/04; A61M16/0402; A61M16/0418; A61M16/0427; A61M16/0434
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
A tracheal tube assembly for use in ventilation of a patient, said assembly being sized for location in the trachea of a patient and comprising an outer tube and an inner cannula that is insertable within and removable from the outer tube, said inner cannula having an inner surface of a first material to which respiratory secretions will cling, and an outer surface of a second material that is different from said first material and provides said outer surface with a lower coefficient of friction than said inner surface to facilitate insertion of said inner cannula into, and removal of said inner cannula from, said outer tube.
Claim 2
Dependent Claim
107 words
A tracheal tube assembly for use in ventilation of a patient, said assembly being sized for location in the trachea of a patient and comprising an outer tube and an inner cannula that is insertable within and removable from the outer tube, said inner cannula having an inner surface of a first material to which respiratory secretions will cling, and an outer surface of a second material that is different from said first material and provides said outer surface with a lower coefficient of friction than said inner surface to facilitate insertion of said inner cannula into, and removal of said inner cannula from, said outer tube.
Claim 3
Dependent Claim
20 words
A tracheal tube assembly according to claim 1 wherein said outer surface is a continuous layer of said second material.
Claim 4
Dependent Claim
26 words
A tracheal tube assembly according to claim 1, wherein said outer surface is provided by at least one filament extending around the outside of the cannula.
Claim 5
Dependent Claim
16 words
A tracheal tube assembly according to claim 3, wherein said filament extends helically around the tube.
Claim 6
Dependent Claim
17 words
A tracheal tube assembly according to claim 3 or 4, wherein said filament is of a metal.
Claim 7
Dependent Claim
25 words
A tracheal tube assembly according to any one of claims 1 to 4, wherein said outer surface is provided by a low friction plastics material.
Claim 8
Dependent Claim
19 words
A tracheal tube assembly according to any one of claims 1 to 4 wherein said inner surface is smooth.
Claim 9
Dependent Claim
25 words
A tracheal tube assembly according to any one of claims 1 to 4 wherein said inner surface (20, 30) is of a flexible plastics material.
Claim 10
Dependent Claim
14 words
A tracheal tube assembly according to claim 8, wherein said inner surface is PVC.
Claim 11
Dependent Claim
46 words
A tracheal tube assembly according to any one of claims 1 to 4 wherein the inner cannula has a machine end that projects beyond a machine end of the outer tube and provides a flexible portion, the inner cannula having a coupling on its machine end.
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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) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |