US3707151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-inflating endotracheal tube
Assignee: Individual
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Filing: 1971-02-16
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Granted: 1972-12-26
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Expires: 1991-02-16
Abstract
Abstract Endotracheal tubes with cuffs that self-inflate during inspiration and remain inflated during expiration, in which the Coanda effect is employed to lead air into the cuff for inflation. Shown is a tube having an opening through its wall into the cuff volume with a surface arranged to lead air into the cuff during inspiration, and a check valve to prevent outward flow of air. Also shown is a cuff having openings arranged to lead air into the cuff during expiration. The cuffs shown are substantially larger than the trachea and are of thin film material.
Inventors
- 👤 Richard Robert Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/04; A61M16/0434; A61M16/045; A61M16/0452; A61M25/00; A61M25/0067; A61M25/0074; A61M25/0075
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
201 words
A self-inflating endotracheal tube comprising an elongated, flexible, open-ended hollow tube having a proximal and distal end, an inflatable cuff of generally tubular configuration and a diameter substantially larger than that of the trachea in which the tube is adapted to be inserted, said cuff being of thin, film material and secured to said tube adjacent the distal end thereof, and means for automatically causing inflation of said cuff in response to inspiration through said tube and for maintaining said cuff inflated during expiration therethrough, the portion of said tube extending through said cuff having an opening including a coanda surface exposed to air flow toward the proximal end in the expiration direction to guide air flowing through said tube into said cuff, said coanda surface comprising a surface sloped at an acute angle to the axis of said tube, said surface being on the upstream side, relative to flow of air in the expiration direction, of said opening and sloping from the interior of the tube outwardly in the downstream direction relative to said flow whereby air flowing in the expiration direction tends to hug and follow said surface through an obtuse angle path into said cuff for maintaining inflation.
Claim 2
Dependent Claim
201 words
A self-inflating endotracheal tube comprising an elongated, flexible, open-ended hollow tube having a proximal and distal end, an inflatable cuff of generally tubular configuration and a diameter substantially larger than that of the trachea in which the tube is adapted to be inserted, said cuff being of thin, film material and secured to said tube adjacent the distal end thereof, and means for automatically causing inflation of said cuff in response to inspiration through said tube and for maintaining said cuff inflated during expiration therethrough, the portion of said tube extending through said cuff having an opening including a coanda surface exposed to air flow toward the proximal end in the expiration direction to guide air flowing through said tube into said cuff, said coanda surface comprising a surface sloped at an acute angle to the axis of said tube, said surface being on the upstream side, relative to flow of air in the expiration direction, of said opening and sloping from the interior of the tube outwardly in the downstream direction relative to said flow whereby air flowing in the expiration direction tends to hug and follow said surface through an obtuse angle path into said cuff for maintaining inflation.
Claim 3
Dependent Claim
146 words
A self-inflating endotracheal tube comprising an elongated, flexible, open-ended hollow tube having a proximal and distal end, an inflatable cuff secured to said tube adjacent the distal end thereof, and means for automatically causing inflation of said cuff in response to inspiration through said tube and for maintaining said cuff inflated during expiration therethrough, the portion of said tube extending through said cuFf being perforate and including a Coanda surface exposed to air flow toward the proximal to guide end expiration air flowing through said tube into said cuff, said Coanda surface defined by walls defining a plurality of openings through the wall of said tube, said openings sloped at an acute angle to the axis of said tube, with the entrance of the opening within the bore of said tube spaced substantially distally of the outlet of said opening into the volume of said cuff.
Claim 4
Dependent Claim
146 words
A self-inflating endotracheal tube comprising an elongated, flexible, open-ended hollow tube having a proximal and distal end, an inflatable cuff secured to said tube adjacent the distal end thereof, and means for automatically causing inflation of said cuff in response to inspiration through said tube and for maintaining said cuff inflated during expiration therethrough, the portion of said tube extending through said cuFf being perforate and including a Coanda surface exposed to air flow toward the proximal to guide end expiration air flowing through said tube into said cuff, said Coanda surface defined by walls defining a plurality of openings through the wall of said tube, said openings sloped at an acute angle to the axis of said tube, with the entrance of the opening within the bore of said tube spaced substantially distally of the outlet of said opening into the volume of said cuff.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |