HEMODIALYSIS APPARATUS AND METHOD FOR HEMODIALYSIS

• US 20070108129A1
• Filed: 11/06/2006
• Published: 05/17/2007
• Est. Priority Date: 11/11/2005
• Status: Active Grant

• Current Assignee: Nikkiso Company Limited
• Original Assignee: Nikkiso Company Limited
• Inventors: Mori, Yoshihiro, Toyoda, Masahiro
• Granted Patent: US 8,496,807 B2
• Time in Patent Office: Days
• US Class Current: 210/646
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1613 Profiling or modelling of patient or predicted treatment evolution or outcome
• CPC Class Codes: A61M 1/361 before treatment
• CPC Class Codes: A61M 2205/3393 by weighing the reservoir
• CPC Class Codes: A61M 2205/52 with memories providing a history of measured variating parameters of apparatus or patient

Abstract

A hemodialysis apparatus includes a dialysis device, a detecting device, an evaluation device and a memory device. The dialysis device dialyzes and ultrafiltrates blood of a patient according to an ultrafiltration volume based on an estimated dry weight while performing hemodialysis treatment on the blood circulating extracorporeally. The detecting device obtains time series data by measuring a parameter related to concentration of the blood circulating extracorporeally at a plurality of points in time series in a process of the hemodialysis treatment by the dialysis device. The evaluation device evaluates appropriateness of the hemodialysis treatment by evaluating whether the estimated dry weight approximates to a dry weight after the hemodialysis treatment by the dialysis device. The memory device stores a plurality of time series data when the hemodialysis treatment is evaluated to be appropriate by the evaluation device.

Claims

1. A hemodialysis apparatus comprising:

a dialysis device configured to dialyze and ultrafiltrate blood of a patient according to an ultrafiltration volume based on an estimated dry weight while performing hemodialysis treatment on the blood circulating extracorporeally;

a detecting device configured to obtain time series data by measuring a parameter related to concentration of the blood circulating extracorporeally at a plurality of points in time series in a process of the hemodialysis treatment by the dialysis device;

an evaluation device configured to evaluate appropriateness of the hemodialysis treatment by evaluating whether the estimated dry weight approximates to a dry weight after the hemodialysis treatment by the dialysis device; and

a memory device configured to store a plurality of time series data when the hemodialysis treatment is evaluated to be appropriate by the evaluation device.

2. The hemodialysis apparatus according to claim 1, wherein the evaluation device evaluates whether the estimated dry weight approximates to the dry weight based on calculating an index called PWI.

3. The hemodialysis apparatus according to claim 1, further comprising:

a calculation device configured to calculate an optimal change in the time series data expected in an appropriate process of the hemodialysis treatment based on the plurality of time series data stored in the memory device.

4. The hemodialysis apparatus according to claim 3, wherein the calculation device calculates an optimal range of change having a predetermined range between a lower limit and a upper limit at each measuring point of the parameter related to concentration of the blood circulating extracorporeally.

5. The hemodialysis apparatus according to claim 3, wherein the parameter measured by the detecting device is displayed in real time superimposed on a graph, by which either the optimal change or an optimal range of change calculated by the calculation device is displayed, when the hemodialysis treatment is performed by the dialysis device.

6. The hemodialysis apparatus according to claim 3, wherein a predetermined notification is provided on condition that the parameter measured by the detecting device deviates from either the optimal change or an optimal range of change calculated by the calculation device when the hemodialysis treatment is performed by the dialysis device.

7. The hemodialysis apparatus according to claim 1, wherein the time series data stored in the memory device are standardized by performing a predetermined operation to obtain universal time series data unrelated to specific conditions of a particular patient such as a body weight and an ultrafiltration volume of the patient.

8. The hemodialysis apparatus according to claim 1, wherein the parameter measured by the detecting device is a variation rate of a circulating blood volume Δ

BV calculated from the concentration of the blood circulating extracorporeally.

9. A method for hemodialysis comprising:

performing ultrafiltration of blood of a patient according to an ultrafiltration volume based on an estimated dry weight while performing hemodialysis treatment on the blood circulating extracorporeally;

obtaining time series data by measuring a parameter related to concentration of the blood circulating extracorporeally at a plurality of points in time series during the performing of the hemodialysis treatment;

evaluating, after the hemodialysis treatment, appropriateness of the hemodialysis treatment by evaluating whether the estimated dry weight approximates to a dry weight; and

storing a plurality of time series data that are evaluated to be optimal.

10. The method for hemodialysis according to claim 9, wherein, in the evaluating, whether the estimated dry weight approximates to the dry weight is evaluated based on calculating an index called PWI.

11. The method for hemodialysis according to claim 9, further comprising:

calculating an optimal change in the plurality of time series data, which are expected during a course of an appropriate hemodialysis treatment, based on the plurality of time series data stored in the storing.

12. The method for hemodialysis according to claim 11, wherein, the calculating obtains an optimal range of change having a predetermined range between a lower limit and a upper limit at each measuring point of the parameter related to the concentration of the blood circulating extracorporeally.

13. The method for hemodialysis according to claim 11, wherein the parameter measured in the obtaining is displayed in real time superimposed on a graph, by which either the optimal change or an optimal range of change calculated in the calculating is displayed, when the hemodialysis treatment is performed.

14. The method for hemodialysis according to claim 11, further comprising:

providing a predetermined notification on condition that the parameter measured in the obtaining deviates from either the optimal change or an optimal range of change calculated in the calculating when hemodialysis treatment is performed.

15. The method for hemodialysis according to claim 9, further comprising:

standardizing the plurality of time series data stored in the storing by performing a predetermined operation and obtaining universal time series data unrelated to specific conditions of a particular patient such as a body weight and an ultrafiltration volume of the patient.

16. The method for hemodialysis according to claim 9, wherein the parameter measured in the obtaining is a variation rate of a circulating blood volume Δ

BV calculated from the concentration of the blood circulating extracorporeally.