US3882020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrate diluter for preparing dialysis liquid in artificial kidneys
Assignee: Bellco SRL
•
Filing: 1974-05-13
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Granted: 1975-05-06
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Expires: 1994-05-13
Abstract
Abstract Concentrate dilutor for preparing dialysis liquid in artificial kidneys comprising flexible ducts for feeding the concentrate and degassed and heated water to a mixing connector. Peristaltic pumping means are provided for transporting the concentrate and the water along the feeding ducts. Between the mixing connector and the dialyser a conductivity cell is disposed for governing regulating means of the dilution of the concentrate. A flow deviator provided upstream of the dialyser is arranged to block the flow of the preparation towards the dialyser and to deviate it to an intermediate container. There are also provided means for measuring the temperature and conductivity of the liquid in the container for controlling the flow deviator.
Inventors
- 👤 Sergio Cere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:01
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1654; A61M1/1656; A61M1/1668
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
Concentrate diluter for preparing dialysis liquid in artificial kidneys, comprising a flexible duct for feeding water which has been previously degassed and heated to a predetermined temperature, and a flexible duct for feeding the concentrate, means for the peristaltic pumping of the degassed water and the concentrate along said ducts, a connector for said ducts arranged to mix the water with the concentrate and convey the preparation so obtained towards the dialyser through a duct along which is disposed a conductivity cell on which depend the means for regulating the dilution of concentrate in the degassed water, a container provided with an overflow and connected to the feed duct for the dialyser by a pair of ducts, one of which feeds a constant fraction of the preparation to the container, and a flow deviator arranged to block the flow of the preparation towards the dialyser, leaving simultaneously open the second of said pair of ducts or vice versa, there being also provided means for measuring the temperature and conductivity of the liquid in the container, and which govern said deviator.
Claim 2
Dependent Claim
180 words
Concentrate diluter for preparing dialysis liquid in artificial kidneys, comprising a flexible duct for feeding water which has been previously degassed and heated to a predetermined temperature, and a flexible duct for feeding the concentrate, means for the peristaltic pumping of the degassed water and the concentrate along said ducts, a connector for said ducts arranged to mix the water with the concentrate and convey the preparation so obtained towards the dialyser through a duct along which is disposed a conductivity cell on which depend the means for regulating the dilution of concentrate in the degassed water, a container provided with an overflow and connected to the feed duct for the dialyser by a pair of ducts, one of which feeds a constant fraction of the preparation to the container, and a flow deviator arranged to block the flow of the preparation towards the dialyser, leaving simultaneously open the second of said pair of ducts or vice versa, there being also provided means for measuring the temperature and conductivity of the liquid in the container, and which govern said deviator.
Claim 3
Dependent Claim
43 words
Diluter as claimed in claim 1, in which said means for measuring the conductivity of the liquid contained in the container comprise a pump for drawing the liquid contained in the container and feeding it back into the container through a conductivity probe.
Claim 4
Dependent Claim
102 words
Diluter as claimed in claim 1, in which the conductivity cell comprises two coaxial metal sleeves connected together by an intermediate tubular portion of insulating plastics material of a thickness such that its internal bore is equal to that of the sleeves, on the opposite ends of these latter there being fixed caps provided with conical portions for inserting the cell into the delivery duct for the dialysis liquid and spaced from the intermediate tubular portion so as to leave uncovered areas of the sleeves for connecting electric terminals for serving the electronic devices for regulating the dilution of the dialysis liquid.
Claim 5
Dependent Claim
44 words
Diluter as claimed in claim 1, in which the pair of ducts which feed into the container pass through a cover which close this latter and extend by a distance such as to determine the fall of the liquid into the container by dripping.
Claim 6
Dependent Claim
29 words
Diluter as claimed in claim 1, in which in the outlet of said connector there is a cylindrical spiral which favours mixing of the degassed water with the concentrate.
Claim 7
Dependent Claim
43 words
Diluter as claimed in claim 1, in which means are provided for regulating the flow of dialysis liquid according to requirements, which vary the rotational speed of the pump which feeds the concentrate in such a manner that the dilution ratio remains constant.
Claim 8
Dependent Claim
45 words
Diluter as claimed in claim 1 in which said peristaltic pumps comprise three idle rollers with their axes parallel to each other, disposed at the vertices of an equilateral triangle and rotatably supported by a support element fixed to a shaft of an electric motor.
Claim 9
Dependent Claim
79 words
Diluter as claimed in claim 1, in which said flow deviator comprises a cam keyed on to the shaft of a reversible geared motor and a pair of abutments disposed in diametrically opposing positions with respect to the cam and spaced from this latter so that the cam can abut against them when it rotates in opposing directions, between the cAm and the abutments there being disposed the ducts which lead to the container and to the dialyser respectively.
References Cited (Backward Citations)
US3508656A
Cited
US3722680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |