US3557786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Administration apparatus for intravenous substances
Assignee: Abbott Laboratories
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Filing: 1968-06-18
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Granted: 1971-01-26
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Expires: 1988-06-18
Abstract
Abstract An improved drip chamber having a filter positioned around the outlet for use in intravenous liquid administration apparatus. The filter is comprised of a woven sheet of plastic monofilament, such as nylon, and is folded intermediately thereof to form filter leaves. The folder filter sheet is positioned over the drip meter outlet, between the drip chamber walls and heat sealed thereto.
Inventors
- 👤 Coutland H Barr Sr
- 👤 Courtland H Barr Jr
- 👤 John W Barr
- 👤 James W Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:35
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
In an intravenous administration apparatus, an improved drip chamber comprising a flexible, transparent chamber body of substantially rounded center cross section, said chamber body having an inlet end and an outlet end, a drop former disposed within said inlet end of said chamber body, said outlet end having a pair of opposed sidewalls and extending substantially parallel to the longitudinal axis of said chamber body, a filter sheet being creased and having a fold and filter leaves, said filter sheet being positioned between said pair of opposed sidewalls so as to be disposed along the horizontal axis of said drip chamber, said filter being sealed to and through to said walls in a fluid-tight closure, an outlet conduit of lesser diameter than said chamber sealed between said walls and said filter leaves at the outlet end of said chamber, said filter sheet disposed between said outlet conduit and said drop former to form a continuous filter envelope.
Claim 2
Dependent Claim
157 words
In an intravenous administration apparatus, an improved drip chamber comprising a flexible, transparent chamber body of substantially rounded center cross section, said chamber body having an inlet end and an outlet end, a drop former disposed within said inlet end of said chamber body, said outlet end having a pair of opposed sidewalls and extending substantially parallel to the longitudinal axis of said chamber body, a filter sheet being creased and having a fold and filter leaves, said filter sheet being positioned between said pair of opposed sidewalls so as to be disposed along the horizontal axis of said drip chamber, said filter being sealed to and through to said walls in a fluid-tight closure, an outlet conduit of lesser diameter than said chamber sealed between said walls and said filter leaves at the outlet end of said chamber, said filter sheet disposed between said outlet conduit and said drop former to form a continuous filter envelope.
Claim 3
Dependent Claim
69 words
In an intravenous administration apparatus in accord with claim 1, the opposed sidewalls of said drip chamber having slits therein, said slits being parallel to the longitudinal axis of the drip chamber body and adapted to receive said filter sheet, said filter sheet being disposed within said slits so that said fold is adjacent the inlet end and the leaves are adjacent the outlet end of said chamber body.
Claim 4
Dependent Claim
18 words
In an intravenous administration apparatus in accord with claim 2, said filter being a woven monofilament nylon filter.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |