US4137168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for dialysation of blood
Assignee: Klauschenz and Perrot KG
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Filing: 1977-09-30
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Granted: 1979-01-30
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Expires: 1997-09-30
Abstract
Abstract Dialysis fluid is produced and transported to a blood dialysis chamber automatically and continuously. A dialysis fluid concentrate and water are mixed and controllably pumped to a buffer storage container from which the mixture is drawn off through the dialysis chamber by a second controllable pump. The second pump is controlled as a function of the quantity of mixture in the buffer container.
Inventors
- 👤 Erwin Perrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:32
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1654; A61M1/1656; A61M1/166; A61M1/1662; A61M1/1664; A61M1/1668; A61M1/1692; A61M2205/00; A61M2205/33; A61M2205/3379; A61M2205/3389
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
220 words
In apparatus for use in blood dialysis, the apparatus including means for the continuous automatic production of dialysis fluid and the transport of such fluid through a chamber whereby impurities in the blood may be transferred to the fluid, the improvement comprising: first pump means, said first pump means being adapted to be connected to a source of water; a buffer container; means for controllably mixing a dialysis fluid concentrate with water passing through said first pump means to provide dialysis fluid having a desired concentration, said mixing means connecting the discharge of said first pump means to said buffer container; means for controlling said first pump means to cause a predetermined amount of dialysis fluid to be delivered to said buffer container per unit of time; means coupling said buffer container to the dialysis chamber whereby dialysis fluid from said buffer container may be passed through said chamber; second pump means, said second pump means being connected in the dialysis fluid transport circuit downstream of the dialysis chamber; means for measuring the quantity of fluid in said buffer container and generating a signal commensurate therewith; and means responsive to said signal commensurate with the quantity of fluid in said buffer container for controlling said second pump means to maintain a constant quantity of dialysis fluid in said buffer container.
Claim 2
Dependent Claim
220 words
In apparatus for use in blood dialysis, the apparatus including means for the continuous automatic production of dialysis fluid and the transport of such fluid through a chamber whereby impurities in the blood may be transferred to the fluid, the improvement comprising: first pump means, said first pump means being adapted to be connected to a source of water; a buffer container; means for controllably mixing a dialysis fluid concentrate with water passing through said first pump means to provide dialysis fluid having a desired concentration, said mixing means connecting the discharge of said first pump means to said buffer container; means for controlling said first pump means to cause a predetermined amount of dialysis fluid to be delivered to said buffer container per unit of time; means coupling said buffer container to the dialysis chamber whereby dialysis fluid from said buffer container may be passed through said chamber; second pump means, said second pump means being connected in the dialysis fluid transport circuit downstream of the dialysis chamber; means for measuring the quantity of fluid in said buffer container and generating a signal commensurate therewith; and means responsive to said signal commensurate with the quantity of fluid in said buffer container for controlling said second pump means to maintain a constant quantity of dialysis fluid in said buffer container.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said quantity measuring means comprises: a capacitive measuring device, said measuring device comprising a pair of spatially displaced electrodes affixed to said buffer container, said electrodes being respectively positioned above and below a desired fluid level.
Claim 4
Dependent Claim
36 words
The apparatus of claim 1 wherein said quantity measuring means comprises: a photoelectric measuring device comprising a cone-shaped float positioned within said buffer container and in the light path between a light source and light sensor.
Claim 5
Dependent Claim
55 words
The apparatus of claim 1 wherein said quantity measuring means comprsies: an inductive measuring device including a magnetic element mounted on a float positioned within said buffer container, said measuring device further including means mounted on said buffer container and responsive to the position of said magnetic element for generating an electrical signal commensurate therewith.
Claim 6
Dependent Claim
28 words
The apparatus of claim 1 wherein said buffer container comprises: a closed vessel; and vent valve means mounted on said vessel for permitting the expulsion of air therefrom.
Claim 7
Dependent Claim
31 words
The apparatus of claim 1 further comprising: third pump means; and means coupling said third pump means to the interior of said buffer container for permitting pressurization of said buffer container.
Claim 8
Dependent Claim
88 words
The apparatus of claim 1 wherein said second pump means comprises a suction pump connected downstream of the dialysis chamber and wherein said apparatus further comprises: dialysis fluid bypass means connected in parallel with the dialysis chamber downstream of said buffer container; controllable valve means for selectively directing the flow of dialysis fluid through the dialysis chamber and said bypass means; and a flow measuring device connected in series with the dialysis chamber downstream thereof, said flow measuring device generating an output signal for controlling said valve means.
Claim 9
Dependent Claim
28 words
The apparatus of claim 7 wherein said buffer container comprises: a closed vessel; and vent valve means mounted on said vessel for permitting the expulsion of air therefrom.
Claim 10
Dependent Claim
46 words
The apparatus of claim 1 further comprising: a first conductance measuring device positioned in the dialysis fluid circuit between said mixing means and said buffer container; and a second conductance measuring device positioned in the dialysis fluid circuit between said buffer container and the dialysis chamber.
Claim 11
Dependent Claim
46 words
The apparatus of claim 7 further comprising: a first conductance measuring device positioned in the dialysis fluid circuit between said mixing means and said buffer container; and a second conductance measuring device positioned in the dialysis fluid circuit between said buffer container and the dialysis chamber.
Claim 12
Dependent Claim
61 words
The apparatus of claim 9 wherein at least one of said conductance measuring devices comprises: means defining a flat cylindrical cavity; means delivering the dialysis fluid to said cavity defining means cavity, said delivering means discharging the dialysis fluid tangentially into said cavity; and means defining an outlet from said cavity, said outlet being located on the axis of said cavity.
Claim 13
Dependent Claim
32 words
The apparatus of claim 11 wherein said delivering means includes an inlet port which communicates with said cavity, said inlet port having a small cross-section in comparison to the desired flow quantity.
Claim 14
Dependent Claim
61 words
The apparatus of claim 10 wherein at least one of said conductance measuring devices comprises: means defining a flat cylindrical cavity; means delivering the dialysis fluid to said cavity defining means cavity, said delivering means discharging the dialysis fluid tangentially into said cavity; and meand defining an outlet from said cavity, said outlet being located on the axis of said cavity.
Claim 15
Dependent Claim
28 words
The apparatus of claim 13 wherein said buffer container comprises: a closed vessel; and vent valve means mounted on said vessel for permitting the expulsion of air therefrom.
References Cited (Backward Citations)
US3352779A
Cited
US3441136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |