Patent US3604420A successfully refreshed from Google Patents.
US3604420A
Expired / Lapsed
US
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Closed system drainage design
Assignee: CR Bard Inc
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Filing: 1969-01-21
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Granted: 1971-09-14
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Expires: 1989-01-21
Abstract
Abstract Means for eliminating the negative pressure problem in a closed urinary (or other) drainage system by shaping or conditioning the interior surface of the drainage tube to overcome differentially the surface tension of the liquid in the tube, permitting air to enter and release the column of liquid, such means comprising making the lumen of the tube noncircular (ridged or grooved), and, where needed. providing a slanting cut opening at the lower end of the tube.
Inventors
- 👤 Vincent L Vaillancourt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/44; A61F5/441
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip cHamber, and said lower end, being bevel cut.
Claim 2
Dependent Claim
84 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip cHamber, and said lower end, being bevel cut.
Claim 3
Dependent Claim
47 words
A system according to claim 1 in which the air vent is constituted by a hole through the top of the drip chamber, a collar surrounding said hole and a cap fitting over said collar with provision of an air passage between the collar and the cap.
Claim 4
Dependent Claim
90 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip chamber, and the drip chamber being provided with a flutter valve on its outlet.
Claim 5
Dependent Claim
90 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip chamber, and the drip chamber being provided with a flutter valve on its outlet.
Claim 6
Dependent Claim
106 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip chamber, the drip chamber being provided with an air vent, and the lower portion of the drip chamber being enlarged and provided with a wide-flaring flutter valve on its outlet.
Claim 7
Dependent Claim
106 words
A closed system for drainage of liquid from a body cavity comprising a tubular conduit having a liquid inlet opening in the cavity and a downwardly extending section, a drip chamber, and a drainage receptacle in a position to receive liquid from said conduit, the lumen of at least part of the downwardly extending section being noncircular in cross section, the lower end of said noncircular part of the downwardly extending section projecting into the drip chamber, the drip chamber being provided with an air vent, and the lower portion of the drip chamber being enlarged and provided with a wide-flaring flutter valve on its outlet.
Claim 8
Dependent Claim
87 words
A drip chamber for use in a body fluid drainage system comprising a hollow closed container, an inlet tube extending into the upper part of the container and terminating at a point below the container wall through which the tube passes, an outlet at the bottom of the container the cross-sectional area of said outlet being substantially larger than the cross-sectional area of the inlet tube and an air vent in the upper part of the container at a level above the termination of the inlet tube.
Claim 9
Dependent Claim
87 words
A drip chamber for use in a body fluid drainage system comprising a hollow closed container, an inlet tube extending into the upper part of the container and terminating at a point below the container wall through which the tube passes, an outlet at the bottom of the container the cross-sectional area of said outlet being substantially larger than the cross-sectional area of the inlet tube and an air vent in the upper part of the container at a level above the termination of the inlet tube.
Claim 10
Dependent Claim
50 words
A drip chamber according to claim 5 in which the outlet is provided with a flutter valve of a size sufficiently large to permit the flow of fluid outward through the outlet at a rate at least equal to the rate of flow into the container through the inlet tube.
Claim 11
Dependent Claim
53 words
A drip chamber according to claim 5 in which the air vent includes a small hole through the wall of the container, a collar projecting from said wall around said hole, filtering material within said collar and a cap fitted over said collar, an air passage being provided between the collar and cap.
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |