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US5100554A
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Method for the in-vivo determination of hemodialysis parameters
Assignee: Fresenius SE and Co KGaA
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Filing: 1990-11-19
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Granted: 1992-03-31
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Expires: 2010-11-19
Abstract
Abstract This invention relates to a method for the in-vivo determination of hemodialysis parameters. To carry out hemodialysis with the greatest efficiency and safety, it is inter alia necessary to know the clearance of the dialyzer. To be able to determine the same in vivo, the invention provides a method in which the electrolyte transfer of the dialysis fluid is measured by means of a measuring device at two different predetermined dialysis fluid ion concentrations and the dialysance is determined on the basis thereof, which dialysance is numerically equal to the clearance.
Inventors
- 👤 Hans-Dietrich Polaschegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:22
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1601; A61M1/1603; A61M1/1605; A61M1/1607; A61M1/1609; A61M1/1615; A61M1/1617; A61M2202/00; A61M2202/04; A61M2202/0496; A61M2202/0498; A61M2205/00; A61M2205/15; A61M2205/33; A61M2205/3317; A61M2205/3324; A61M2230/00; A61M2230/65
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A method for the in-vivo determination of hemodialysis parameters with a dialyzer using an apparatus for adjusting the ion concentration of the dialysis fluid and a measuring device, comprising measuring the electrolyte transfer of said dialysis fluid by making first and second measurements with said measuring device at two different predetermined dialysis fluid ion concentrations and determining the dialysance by determining the difference between the differences of said dialysis fluid ion concentration at the inlet side and the outlet side of the dialyzer at the time of the first and second measurements, respectively, dividing the result by the difference of said dialysis fluid ion concentration at said inlet side at the time of said first and said second measurements, and multiplying by the dialysis fluid flow.
Claim 2
Independent Claim
126 words
A method for the in-vivo determination of hemodialysis parameters with a dialyzer using an apparatus for adjusting the ion concentration of the dialysis fluid and a measuring device, comprising measuring the electrolyte transfer of said dialysis fluid by making first and second measurements with said measuring device at two different predetermined dialysis fluid ion concentrations and determining the dialysance by determining the difference between the differences of said dialysis fluid ion concentration at the inlet side and the outlet side of the dialyzer at the time of the first and second measurements, respectively, dividing the result by the difference of said dialysis fluid ion concentration at said inlet side at the time of said first and said second measurements, and multiplying by the dialysis fluid flow.
Claim 3
Dependent Claim
17 words
A method according to claim 1, comprising carrying out the two measurements at a short time intervals.
Claim 4
Dependent Claim
17 words
A method according to claim 1 or 2 comprising measuring the Na concentration of said dialysis fluid.
Claim 5
Dependent Claim
17 words
A method according to claim 1 or 2, comprising measuring the temperature-corrected conductivity of said dialysis fluid.
Claim 6
Dependent Claim
15 words
A method according to claim 1, comprising carrying out the measurements by using conductivity sensors.
Claim 7
Dependent Claim
20 words
A method according to claim 1, comprising determining the clearance of said dialyzer on the basis of said determined dialysance.
Claim 8
Dependent Claim
28 words
A method according to claim 1, comprising determining changes in the aqueous portion of blood by measuring changes in one or both of said clearance and said dialysance.
Claim 9
Dependent Claim
43 words
A method according to claim 1, comprising determining changes in the blood volume and comparing said changes with changes in one or both of said clearance and said dialysance, and determining changes in the transportation properties of the membrane on the basis thereof.
Claim 10
Dependent Claim
27 words
A method according to claim 1, comprising adjusting said dialysis fluid flow to two different values and determining said dialysance in dependence upon said dialysis fluid flow.
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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |