Patent US3756233A successfully refreshed from Google Patents.
US3756233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid administration apparatus
Assignee: Individual
•
Filing: 1971-03-31
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Granted: 1973-09-04
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Expires: 1991-03-31
Abstract
Abstract An administration set includes a narrow bore valveless metering tube which leads from a liquid container to a vented drip chamber. From the drip chamber, the liquid discharges through one end of an infusion tube, the opposite end of which is adapted to infuse the reservoir liquid into an independent liquid system, e.g. the circulatory system of a patient. A container access cap having a tubular spout through which the container liquid flows and a vented sump into which the spout leads, maintains the effective elevation of the liquid drawn from the bottle at a substantially constant value. The drip chamber is mounted on a channel for vertical movement with respect to the access cap. One end of the metering tube drains the sump and the other forms the inner wall of a double walled nozzle in the drip chamber. A float is provided as a flow regulator in the chamber to automatically vary a constriction to the liquid access to the infusion tube in response to variations in system back pressure.
Inventors
- 👤 M Goldowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:23
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/1411
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
398 words
A calibrated administration set for the variable control of the infusion flow of a liquid carried in a container over a range of flow rates, including particularly low flow rates, into a separate liquid system having a variable liquid back pressure, the administration set comprising means adapted to form an access for liquid flow from the container, the access means including means maintaining a substantially constant effective elevational level of container supply liquid at atmospheric pressure while liquid is flowing from the container and actual liquid level in the container decreases, flexible flow metering conduit means for transmitting the liquid from the access means, one end of the flow metering conduit means being in liquid communication with the access means, means providing a discharge nozzle at the other end of the flow metering conduit means, means atmospherically venting the nozzle, the flow metering conduit means, the access means and the nozzle forming an unconstricted valveless passageway for gravity liquid flow from the substantially constant level of supply liquid located in the access means, the primary factor of flow resistance in the valveless passageway being provided solely by the flow metering conduit means, flow regulating means for adjustably controlling the rate of flow of liquid through the valveless passageway and maintaining such flow at a predetermined valve without sub-stantial fluctuations, the flow regulating means consisting of means adjustably fixing the nozzle end of the flow metering conduit means at a specific elevation with respect to the elevational level of supply liquid at atmospheric pressure to thereby maintain the effective head of liquid at the nozzle at a fixed desired value, the means adjustably fixing the nozzle end including means receiving the nozzle end of the flow metering conduit meAns, support means, means maintaining the support means fixed with respect to the elevational level of supply liquid at atmospheric pressure and means selectively permitting and preventing relative movement between the support means and the receiving means, the liquid flowing through the conduit means at a rate adjustably controlled solely by the effective head of liquid at the nozzle, and infusion means for infusing the liquid discharged from the nozzle into the system at the same flow rate as the liquid is flowing through the conduit means regardless of changes in system back pressure whereby the desired liquid flow rate may be adjustably set and accurately maintained over extended time durations.
Claim 2
Dependent Claim
398 words
A calibrated administration set for the variable control of the infusion flow of a liquid carried in a container over a range of flow rates, including particularly low flow rates, into a separate liquid system having a variable liquid back pressure, the administration set comprising means adapted to form an access for liquid flow from the container, the access means including means maintaining a substantially constant effective elevational level of container supply liquid at atmospheric pressure while liquid is flowing from the container and actual liquid level in the container decreases, flexible flow metering conduit means for transmitting the liquid from the access means, one end of the flow metering conduit means being in liquid communication with the access means, means providing a discharge nozzle at the other end of the flow metering conduit means, means atmospherically venting the nozzle, the flow metering conduit means, the access means and the nozzle forming an unconstricted valveless passageway for gravity liquid flow from the substantially constant level of supply liquid located in the access means, the primary factor of flow resistance in the valveless passageway being provided solely by the flow metering conduit means, flow regulating means for adjustably controlling the rate of flow of liquid through the valveless passageway and maintaining such flow at a predetermined valve without sub-stantial fluctuations, the flow regulating means consisting of means adjustably fixing the nozzle end of the flow metering conduit means at a specific elevation with respect to the elevational level of supply liquid at atmospheric pressure to thereby maintain the effective head of liquid at the nozzle at a fixed desired value, the means adjustably fixing the nozzle end including means receiving the nozzle end of the flow metering conduit meAns, support means, means maintaining the support means fixed with respect to the elevational level of supply liquid at atmospheric pressure and means selectively permitting and preventing relative movement between the support means and the receiving means, the liquid flowing through the conduit means at a rate adjustably controlled solely by the effective head of liquid at the nozzle, and infusion means for infusing the liquid discharged from the nozzle into the system at the same flow rate as the liquid is flowing through the conduit means regardless of changes in system back pressure whereby the desired liquid flow rate may be adjustably set and accurately maintained over extended time durations.
Claim 3
Dependent Claim
37 words
An administration set constructed in accordance with claim 1 wherein the means selectively permitting and preventing relative movement between the support means and the receiving means includes means slidably interconnecting the receiving means and the support means.
Claim 4
Dependent Claim
36 words
An administration set constructed in accordance with claim 2 wherein the support means includes a slotted channel extending downwardly from the access means, the receiving means being movable along a fixed path registered with the slot.
Claim 5
Dependent Claim
39 words
An administration set constructed in accordance with claim 1 wherein the unconstricted valveless passageway includes a flow path of transverse cross sectional area at least as great as the transverse cross sectional area of the flow metering conduit means.
Claim 6
Dependent Claim
166 words
An administration set constructed in accordance with claim 1 wherein the means maintaining the effective level of liquid includes means forming a liquid spout for liquid communication with the liquid in the container, means forming a sump beneath the spout, the spout extending into the sump, means atmospherically venting the sump, the flow metering conduit means being in liquid communication with the sump for drawing from the liquid collected in the sump, the spout having a discharge opening positioned within the sump, at least a portion of said discharge opening extending in a plane angularly oriented with respect to the plane of the liquid level within the sump, the liquid meniscus easily breaking at the highest elevation of the spout opening to permit the entrance of air into the container and the discharge of additional liquid through the spout to replenish the sump, whereby the effective atmospheric level of liquid drawn from the container is substantially maintained at the highest elevation of the spout discharge opening.
Claim 7
Dependent Claim
170 words
An administration set constructed in accordance with claim 1 wherein the infusion means includes a cylindrical drip chamber, the means atmospherically venting the nozzle including means venting the chamber, means forming an outlet orifice in the chamber, said outlet orifice being positioned at the bottom of the chamber, a flow regulating valve positioned within the chamber, the valve including a cylindrical body of smaller diameter than the chamber and a dependent valve stem, the valve having a specific gravity such that it is buoyant in the supply liquid, the valve stem being generally aligned with the outlet orifice, and a quantity of supply liquid collecting in the chamber and lifting the valve body to permit liquid flow through the outlet orifice and into the separate liquid system, the valve body lowering to constrict the outlet orifice upon a decrease in the back pressure of the separate liquid system and rising from the outlet orifice upon an increase in said system back pressure to thereby maintain a constant infusion of flow.
Claim 8
Dependent Claim
194 words
An administration set constructed in accordance with claim 1 wherein the nozzle includes a downwardly extending hollow protuberance having an open bottom, a substantially cylindrical shell positioned about the protuberance, the shell having inner dimensions larger than the outer dimensions of the protuberance and thereby providing a span between the shell and the protuberance, the shell extending downwrdly to an open bottom, the shell oPen bottom being at an elevation lower than the bottom of the protuberance, the means venting the nozzle including means forming a vent passage through the shell, the span carrying a column of liquid having a meniscus at the bottom of the shell, the surface tension of the meniscus supporting and maintaining the column, the flow of liquid through the conduit means causing the column to enlarge and causing a drop to form and be released, the infusion means including a drip chamber means in the chamber for collecting drops issuing from the nozzle, the collecting means being spaced from the shell bottom a distance sufficient to permit successive drops to freely fall, and means providing an atmospherically vented free fall space between the shell bottom and the collecting means.
Claim 9
Dependent Claim
178 words
A drip chamber for use with a physiological liquid administration set, the chamber comprising a nozzle having a downwardly extending hollow probuberance, the protuberance having an open bottom, and a substantially cylindrical shell positioned about the protuberance, the shell having inner dimensions larger than the outer dimensions of the protuberance and thereby providing a span between the shell and the protuberance, the shell extending downwardly to an open bottom lower than that of the protuberance, means forming a vent passage through the shell, the span carrying a column of liquid having its meniscus at the bottom of the shell, the surface tension of the meniscus supporting and maintaining the column, the flow of liquid through the protuberance causing the column to rise and a drop to form and be released, the chamber further including means for collecting drops issuing from the nozzle, the collecting means being spaced from the shell bottom a distance sufficient to permit successive drops to freely fall, and means providing an atmospherically vented free fall space between the shell bottom and the collecting means.
Claim 10
Dependent Claim
178 words
A drip chamber for use with a physiological liquid administration set, the chamber comprising a nozzle having a downwardly extending hollow probuberance, the protuberance having an open bottom, and a substantially cylindrical shell positioned about the protuberance, the shell having inner dimensions larger than the outer dimensions of the protuberance and thereby providing a span between the shell and the protuberance, the shell extending downwardly to an open bottom lower than that of the protuberance, means forming a vent passage through the shell, the span carrying a column of liquid having its meniscus at the bottom of the shell, the surface tension of the meniscus supporting and maintaining the column, the flow of liquid through the protuberance causing the column to rise and a drop to form and be released, the chamber further including means for collecting drops issuing from the nozzle, the collecting means being spaced from the shell bottom a distance sufficient to permit successive drops to freely fall, and means providing an atmospherically vented free fall space between the shell bottom and the collecting means.
References Cited (Backward Citations)
US1205410A
Cited
US1844342A
Cited
GB438611A
Cited
US2090273A
Cited
US2989052A
Cited
US3207372A
Cited
US3227173A
Cited
US3604420A
Cited
US3690318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |