Patent US3848604A successfully refreshed from Google Patents.
US3848604A
Expired / Lapsed
US
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Suction catheter
Assignee: PHYSICIAN S MEDICAL PATENT DEV
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Filing: 1973-02-16
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Granted: 1974-11-19
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Expires: 1993-02-16
Abstract
Abstract A suction catheter comprising an elongated flexible plastic tube having a lumen running interiorly thereof and defining an opening at the distal end. Means are provided at the proximal end for connecting the catheter to a source of vacuum. The distal end of the tube is provided with laterally extending flange means and a plurality of apertures are defined through the tube into the lumen immediately proximal of the flange means for producing a flow of gas over the flange means to provide a gaseous cushion between the flange means and the wall of a body cavity into which the catheter is to be inserted thereby assisting in maintaining a spaced relationship therebetween.
Inventors
- 👤 M Sackner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M25/007; A61M1/00; A61M1/84; A61M25/0021; A61M2025/0073
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
A suction catheter of a size suitable for insertion into a body cavity containing a gas such as the nose, mouth or laryngotracheobronchial tree, comprising an elongated tube formed of a flexible material having a lumen running interiorly thereof, said tube having a distal end with an opening for placing said lumen in communication with the interior of the body cavity and a proximal end adapted to place said lumen in communication with a source of pressure lower than that existing at the distal end of said tube, regulation means for controlling, from said proximal end, the suction applied at said distal end, aperture means near said distal end extending through said tube into said lumen, and flange means extending laterally from said tube adjacent said aperture means and between said aperture means and said opening to maintain said aperture means spaced from the walls of said body cavity thereby aiding in preventing occlusion of said aperture means upon application of suction to said catheter.
Claim 2
Dependent Claim
165 words
A suction catheter of a size suitable for insertion into a body cavity containing a gas such as the nose, mouth or laryngotracheobronchial tree, comprising an elongated tube formed of a flexible material having a lumen running interiorly thereof, said tube having a distal end with an opening for placing said lumen in communication with the interior of the body cavity and a proximal end adapted to place said lumen in communication with a source of pressure lower than that existing at the distal end of said tube, regulation means for controlling, from said proximal end, the suction applied at said distal end, aperture means near said distal end extending through said tube into said lumen, and flange means extending laterally from said tube adjacent said aperture means and between said aperture means and said opening to maintain said aperture means spaced from the walls of said body cavity thereby aiding in preventing occlusion of said aperture means upon application of suction to said catheter.
Claim 3
Dependent Claim
32 words
A suction catheter according to claim 1 wherein the area of said aperture means is sufficient to permit only a nominal vacuum at said opening upon application of suction to said catheter.
Claim 4
Dependent Claim
72 words
A suction catheter according to claim 1 wherein said flange means is a continous ring extending about the periphery of said tube contiguous to said distal end, and said aperture means is immediately proximal of said ring, whereby flow of gas over said ring provides a gaseous cushion between said ring and the wall of the body cavity into which the catheter is inserted to assist in maintaining a spaced relationship therebetween.
Claim 5
Dependent Claim
19 words
A suction catheter according to claim 3 wherein the edge of said opening and flange means are smoothly rounded.
Claim 6
Dependent Claim
19 words
A suction catheter according to claim 1 wherein said aperture means comprises a plurality of equally circumferentially spaced apertures.
Claim 7
Dependent Claim
40 words
A suction catheter according to claim 5 wherein the diameter of said apertures is sufficient to produce a nominal vacuum at said opening means when a vacuum of 160 mm. Hg is applied to the proximal end of said tube.
Claim 8
Dependent Claim
86 words
A suction catheter according to claim 6 wherein for a tube having an outside diameter of 0.181 + or - 0.004 inches and a wall thickness of 0.028 inches, said flange means has an outside diameter of 0.265 + or - 0.010 inches and a radius of 0.035 inches, said aperture means comprises four equally circumferentially spaced apertures having a diameter of 0.059 + or - 0.002 inches, the distal edge of each of which is proximal of said flange means no more than 0.015 inches.
Claim 9
Dependent Claim
86 words
A suction catheter according to claim 6 wherein for a tube having an outside diameter of 0.221 + or - 0.004 inches and a wall thickness of 0.032 inches, said flange means has an outside diameter of 0.31 + or - 0.010 inches and a radius of 0.035 inches, said aperture means comprises four equally circumferentially spaced apertures having a diameter of 0.063 + or - 0.002 inches, the distal edge of each of which is proximal of said flange means no more than 0.015 inches.
References Cited (Backward Citations)
FR387000A
Cited
US2687731A
Cited
US2826197A
Cited
US2910981A
Cited
US3590820A
Cited
US3623483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |