Method and system for optimizing dialysis clearance

• US 5,507,723 A
• Filed: 05/24/1994
• Issued: 04/16/1996
• Est. Priority Date: 05/24/1994
• Status: Expired due to Term

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Keshaviah, Prakash R.
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): GRING, NOELLE K
• Application Number:
  US08/248,025
• Time in Patent Office: 693 Days
• Field of Search: 604/4, 604/5, 604/31, 604/65, 604/28, 604/29, 604/19, 210/646, 210/647, 210/321.65, 210/321.71
• US Class Current: 604/6.11
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1609 after use, i.e. downstream of dialyser
• CPC Class Codes: A61M 1/1613 Profiling or modelling of patient or predicted treatment evolution or outcome
• CPC Class Codes: A61M 1/1615 using measurements made at different flow rates
• CPC Class Codes: A61M 1/1617 using measurements made during a temporary variation of a characteristic of the fresh dialysis fluid
• CPC Class Codes: A61M 2202/0498 Urea
• CPC Class Codes: A61M 2205/15 Detection of leaks

Abstract

A system and method using same are provided for determining the optimum operating conditions of a dialysis process that yields the highest whole body dialysis clearance. The system varies a parameter that effects dialysis efficiency during part of a dialysis run. The system then measures a metabolite concentration in an outflow dialysate. The system develops a metabolite concentration profile as a function of the varied parameter. Based on these measurements, the system correlates the metabolite concentration measurements to determine the optimum parameter setting that yields the maximum metabolite concentration.

Claims

1. A method for obtaining the highest whole body dialysis clearance in a dialysis system comprising the steps of:

varying a parameter that effects dialysis efficiency during part of a dialysis run;

measuring a metabolite concentration in an outflow dialysate;

developing a metabolite concentration profile as a function of the varied parameter from the metabolite concentration measurements; and

correlating the metabolite concentration measurements to determine an optimum parameter setting that yields a maximum metabolite concentration.

2. The method of claim 1 wherein the parameter is blood flow rate.

3. The method of claim 2 further comprising stepwise increasing the blood flow rate in specified increments.

4. The method of claim 2 further comprising stepwise decreasing the blood flow rate in specified decrements.

5. The method of claim 2 further comprising the step of storing an optimum blood flow rate associated with the maximum metabolite concentration.

6. The method of claim 1 wherein the metabolite is selected from the group consisting of:

urea, creatinine, phosphate, and uric acid.

7. The method of claim 1 further comprising measuring the metabolite concentration each time the parameter is varied.

8. A method for determining the optimum blood pump setting of a dialysis system to obtain the highest whole body dialysis clearance comprising the steps of:

varying a blood flow rate during a dialysis run;

measuring a metabolite concentration in an outflow dialysate;

developing a metabolite concentration profile as a function of the blood flow rate; and

correlating the metabolite concentration measurements to determine an optimum blood flow rate setting that yields a maximum metabolite concentration.

9. The method of claim 8 wherein the metabolite is selected from the group consisting of:

urea, creatinine, phosphate, and uric acid.

10. The method of claim 8 further comprising stepwise increasing the blood flow rate in specified increments.

11. The method of claim 8 further comprising stepwise decreasing the blood flow rate in specified decrements.

12. The method of claim 8 further comprising measuring the metabolite concentration each time the blood flow is varied.

13. The method of claim 8 further comprising the step of storing an optimum blood flow rate associated with the maximum metabolite concentration.

14. A system for obtaining the highest whole body dialysis clearance in a dialysis system comprising:

means for varying a parameter that effects dialysis efficiency during part of a dialysis run;

means for measuring a metabolite concentration in an outflow dialysate;

means for developing a metabolite concentration profile as a function of the varied parameter; and

means for correlating the metabolite concentration measurements to determine an optimum parameter setting that yields a maximum metabolite concentration.

15. The system of claim 14 wherein the parameter is blood flow rate.

16. The system of claim 15 further comprising means for increasing the blood flow rate in specified increments.

17. The system of claim 15 further comprising means for decreasing the blood flow rate in specified decrements.

18. The system of claim 14 wherein the metabolite is selected from the group consisting of:

urea, creatinine, phosphate, and uric acid.

19. The system of claim 14 further comprising means for storing an optimum parameter setting associated with the maximum metabolite concentration.