Method and system for preventing intradialytic symptomatology

• US 6,284,141 B1
• Filed: 08/04/1999
• Issued: 09/04/2001
• Est. Priority Date: 11/28/1996
• Status: Expired due to Fees

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro Lundia AB (Baxter International Inc.)
• Inventors: Shaldon, Stanley, Granolleras, Céline
• Primary Examiner(s): Kim, John
• Application Number:
  US09/308,969
• Time in Patent Office: 762 Days
• Field of Search: 210/645, 210/646, 210/647, 210/739, 210/746, 210/85, 210/86, 210/97, 210/143, 210/321.65, 210/321.71, 210/650, 604/4.01, 604/5.01, 604/5.04
• US Class Current: 210/739
• 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 1/341 by measuring the filtrate rate or volume
• CPC Class Codes: A61M 1/3413 Diafiltration
• CPC Class Codes: A61M 1/3465 using dialysate as substitution fluid
• CPC Class Codes: A61M 1/3612 after treatment
• CPC Class Codes: A61M 2202/0498 Urea
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2205/50 with microprocessors or computers

Abstract

Methods and apparatus are disclosed for conducting blood treatment procedures. The method includes conducting the treatment procedure such as dialysis at a first efficiency until a limit value is reached, and then altering the first efficiency to a second efficiency until a second limit value has been reached. The method also includes devising a predetermined efficiency profile for the blood treatment procedure, conducting the procedure at a predetermined efficiency until a first limit value is reached, and then altering the efficiency of the blood treatment procedure in accordance with the predetermined efficiency profile.

Claims

1. A method of conducting a blood treatment procedure comprising conducting said blood treatment procedure at a first predetermined efficiency and before reaching a first predetermined time limit value, said time limit value being determined on the basis of a patient specific parameter, altering said first predetermined efficiency to a second predetermined efficiency wherein said first predetermined efficiency is higher than said second predetermined efficiency, and wherein said blood treatment procedure is selected from the group consisting of hemodialysis, hemofiltration and hemodiafiltration.

2. The method of claim 1 wherein said second predetermined efficiency comprises a predetermined efficiency profile including at least a third predetermined efficiency.

3. The method of claim 1 wherein said first predetermined time limit value is the time when a predetermined dialysis dose has been reached, said dialysis dose being a function of said first predetermined efficiency.

4. A method of conducting a blood treatment procedure comprising devising a predetermined profile of efficiency based on a patient specific characteristic curve for said blood treatment procedure, conducting said blood treatment procedure at a first predetermined efficiency, and before reaching a first predetermined time limit value determined on the basis of said characteristic curve altering said efficiency of said blood treatment procedure in accordance with said predetermined profile of efficiency wherein said altered efficiency is lower than said first predetermined efficiency, and wherein said blood treatment procedure is selected from the group consisting of hemodialysis, hemofiltration and hemodiafiltration.

5. The method of claim 4 including measuring an amount of urea removed by said dialysis and determining said first predetermined time limit value based upon removal of a predetermined amount of said urea.

6. The method of claim 5 including determining a urea generation rate for a specific patient and wherein said predetermined amount of said urea is based upon said urea generation rate.

7. The method of claim 6 including determining said predetermined amount of urea based upon the product of said urea generation rate, the time between said dialysis procedure and a second dialysis procedure, and a predetermined patient factor.

8. The method of claim 4 including measuring the concentration of urea removed by said dialysis in the dialysis outlet fluid, and determining said first predetermined time limit value based upon a predetermined concentration of said urea.

9. The method of claim 4 wherein said determining of said profile of efficiency for said blood treatment procedure comprises altering at least one of blood flow rate and a dialysis fluid flow rate through a dialyzer.

10. The method of claim 9 including devising a characteristic curve of efficiency for a specific patient, wherein said determining of said profile of said efficiency for said blood treatment procedure is based upon a curve approaching said characteristic curve.

11. The method of claim 10 wherein said determining of said profile of said efficiency is carried out stepwise or continuously.

12. The method of claim 11 wherein said predetermined profile of said efficiency is based upon the urea concentration of said dialysis fluid through said dialyzer, and wherein said determining of said profile of efficiency for said blood treatment procedure is based upon maintaining said urea concentration upon said predetermined profile.

13. Apparatus for conducting a blood treatment procedure comprising means for conducting said blood treatment procedure at a first predetermined efficiency, and means for altering said first predetermined efficiency to a second, lower, predetermined efficiency before reaching a first predetermined time limit value wherein said predetermined time limit value is determined on the basis of a patient specific parameter, and wherein said blood treatment procedure is selected from the group consisting of hemodialysis, hemofiltration and hemodiafiltration.

14. Apparatus for conducting a blood treatment procedure comprising means for devising a predetermined profile of efficiency based on a patient specific characteristic curve for said blood treatment procedure, means for conducting said blood treatment procedure at a first predetermined efficiency, and means for altering said efficiency of said blood treatment procedure in accordance with said predetermined profile of efficiency, before reaching a first predetermined time limit value, wherein said first predetermined time limit value is determined on the basis of a patient specific parameter, and wherein said blood treatment procedure is selected from the group consisting of hemodialysis, hemofiltration and hemodiafiltration.

15. The apparatus of claim 14 including means for measuring an amount of urea removed by said dialysis, and means for determining said first predetermined time limit value based upon a predetermined amount of said urea removed.

16. The apparatus of claim 15 including means for determining a urea generation rate for a specific patient and means for determining said predetermined amount of urea removed based upon said urea generation rate.

17. The apparatus of claim 16 including means for determining said predetermined amount of said urea removed based upon the product of said urea generation rate, the time between said dialysis and a second dialysis procedure, and a predetermined patient factor.

18. The apparatus of claim 14 including means for measuring the concentration of urea removed by said dialysis, and means for determining said first predetermined limit value based upon a predetermined concentration of said urea.

19. The apparatus of claim 14 wherein said means for determining said profile of efficiency for said blood treatment procedure comprises means for altering at least one of blood flow rate and a dialysis fluid flow rate through a dialyzer.

20. The apparatus of claim 19 including means for devising a characteristic curve of efficiency for a specific patient, wherein said means for determining of said profile of said efficiency for said treatment procedure is based upon a curve approaching said characteristic curve.

21. The apparatus of claim 20 wherein said means for determining said profile of said efficiency is carried out stepwise or continuously.

22. The apparatus of claim 19 including means for determining a predetermined profile, and wherein said means for determining the profile of said efficiency for said blood treatment procedure is based upon a urea concentration of said dialysis fluid through said dialyzer.