US3648694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic system with perfusion protection against malfunction
Assignee: INSTITUTUL ONCOLOGIC BUCHAREST
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Filing: 1968-09-25
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Granted: 1972-03-14
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Expires: 1988-09-25
Abstract
Abstract A system for performing intravenous perfusions of a treatment liquid propelled by gas under pressure includes a gauge which vents the gas line in the event of excessive gas pressure. In the event of insufficient gas pressure, the gauge actuates a controller for switching a valve to divert the liquid flow from the perfusion implement to a drain, the controller also responding in like manner to gas occlusions sensed by a bubble detector and to a slowdown in the flow rate as measured by a drop counter.
Inventors
- 👤 Ion Mogos
- 👤 Cormel I Muscel
- 👤 Nicolaie Dumitrescu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:02
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M5/14; A61M5/142; A61M5/145; A61M5/155; A61M5/168; A61M5/16886; A61M5/1689; Y; Y10; Y10S; Y10S128/00; Y10S128/12; Y10S128/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
A perfusion system for intravenously administering a liquid to a patient, comprising a container for said liquid; a source of gas under pressure; a gas line connecting said source to said container for subjecting the liquid therein to the pressure of the gas; a fluid line originating at said container for conveying said liquid to a perfusion implement; normally closed first valve means connected with said gas line; gauge means responsive to the gas pressure in said container for generating a first alarm signal upon said gas pressure rising above an upper limit of a predetermined range and for generating a second alarm signal upon said gas pressure falling beneath a lower limit of said range; drain means branching off said fluid line; second valve means at the junction of said fluid line with said drain means for normally directing said liquid to said perfusion implement; first control means for said first valve means responsive to said first alarm signal for venting said gas line; and second control means for said second valve means responsive to said second alarm signal for diverting said liquid from said perfusion implement to said drain means.
Claim 2
Dependent Claim
192 words
A perfusion system for intravenously administering a liquid to a patient, comprising a container for said liquid; a source of gas under pressure; a gas line connecting said source to said container for subjecting the liquid therein to the pressure of the gas; a fluid line originating at said container for conveying said liquid to a perfusion implement; normally closed first valve means connected with said gas line; gauge means responsive to the gas pressure in said container for generating a first alarm signal upon said gas pressure rising above an upper limit of a predetermined range and for generating a second alarm signal upon said gas pressure falling beneath a lower limit of said range; drain means branching off said fluid line; second valve means at the junction of said fluid line with said drain means for normally directing said liquid to said perfusion implement; first control means for said first valve means responsive to said first alarm signal for venting said gas line; and second control means for said second valve means responsive to said second alarm signal for diverting said liquid from said perfusion implement to said drain means.
Claim 3
Dependent Claim
76 words
A perfusion system as defined in claim 1, further comprising a drop chamber in series with said fluid line upstream of said junction and counting means connected to said drop chamber for measuring the rate of liquid flow therethrough, said counting means having an output connected to said second control means for operating said second valve means to divert said liquid to said drain means upon a substantial decrease of said rate from a predetermined level.
Claim 4
Dependent Claim
67 words
A perfusion system as defined in claim 1, further comprising a bubble detector in series with said fluid line upstream of said junction for ascertaining the presence of gas occlusions in the liquid flow, said bubble detector having an output connected to said second control means for operating said second valve means to divert said liquid to said drain means in the presence of such gas occlusions.
Claim 5
Dependent Claim
58 words
A perfusioN system as defined in claim 1, further comprising a vessel for the storage of an additive to be admixed with said liquid, said vessel being connected to said gas line in parallel with said container for placing said additive under the pressure of said gas, said fluid line passing through said vessel ahead of said junction.
Claim 6
Dependent Claim
34 words
A perfusion system as defined in claim 4, further comprising conduit means bypassing said vessel and further valve means for selectively dividing the flow of said liquid between said vessel and said conduit means.
Claim 7
Dependent Claim
43 words
A perfusion system as defined in claim 1 wherein said second control means is an electromagnetic device effective in a deenergized condition to maintain said second valve means in an off-normal position cutting off the flow of said liquid to said perfusion implement.
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |