Patent US4227527A successfully refreshed from Google Patents.
US4227527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterile air vent
Assignee: Baxter International Inc
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Filing: 1978-10-23
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Granted: 1980-10-14
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Expires: 1998-10-23
Abstract
Abstract A sterile air vent is disclosed which permits the passage of gas but is substantially impervious to microorganisms. The vent may be used on a variety of medical apparatus and it is particularly suitable as a tip protector for the tip ends of medical fluid administration sets or the like. The filtering is provided by a solid micro-porous plug of selected material carried in an air passageway of the vent housing, which housing is adapted for attachment to the desired medical apparatus. The plug is sufficiently porous to permit gas to pass through while filtering out bacteria or other organisms which would impair the sterility of the medical apparatus.
Inventors
- 👤 Michael P. De Frank
- 👤 James W. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:29
CPC Classifications
A; A61; A61M; A61M39/00; A61M39/20; A61M2039/205; A61M2205/00; A61M2205/75; A61M2205/7536
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A sterility preserving tip protector for overfitting one end of a medical fluid administration set and the like comprising: an elongated resilient plastic tube; a unitary microporous sintered plastic filter element in the shape of a plug received within one end of said tube, the other end of said tube being open for fitting over one end of the administration set, said filter element having a pore size of between 10 and 20 microns inclusive, and a length of between 0.25 and 0.5 inches inclusive, to preserve sterility of the set and to readily pass gas therethrough.
Claim 2
Dependent Claim
97 words
A sterility preserving tip protector for overfitting one end of a medical fluid administration set and the like comprising: an elongated resilient plastic tube; a unitary microporous sintered plastic filter element in the shape of a plug received within one end of said tube, the other end of said tube being open for fitting over one end of the administration set, said filter element having a pore size of between 10 and 20 microns inclusive, and a length of between 0.25 and 0.5 inches inclusive, to preserve sterility of the set and to readily pass gas therethrough.
Claim 3
Dependent Claim
18 words
A tip protector in accordance with claim 1 wherein said filter element is frictionally retained within said tube.
Claim 4
Dependent Claim
34 words
A tip protector in accordance with claim 2 wherein said plug-shaped filter element includes tapered sidewalls, the diameter of one end of said element being larger than the inside diameter of said plastic tube.
Claim 5
Dependent Claim
16 words
A tip protector in accordance with claim 1 wherein said plastic filter element is sintered polyethylene.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |