Dialysis apparatus using a blood pressure meter and a controller

• US 6,579,241 B2
• Filed: 01/24/2002
• Issued: 06/17/2003
• Est. Priority Date: 01/24/2001
• Status: Expired due to Fees

• Current Assignee: University of Maryland
• Original Assignee: B. Braun Melsungen Medizintechnologie GmbH
• Inventors: Roeher, Otfried
• Primary Examiner(s): Hindenburg, Max F.
• Assistant Examiner(s): Natnithithadha, Navin
• Application Number:
  US10/053,599
• Publication Number:
  US 20020107449A1
• Time in Patent Office: 509 Days
• Field of Search: 600/481, 600/483, 600/485, 600/490, 600/492, 600/493, 600/494, 600/495, 600/496, 600/497, 210/646, 210/439, 210/741, 604/67
• US Class Current: 600/485
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1645 with mechanically linked peristaltic dialysis fluid pumps one upstream, the other one downstream of the dialyser
• CPC Class Codes: A61M 1/341 by measuring the filtrate rate or volume
• CPC Class Codes: A61M 1/3607 Regulation parameters
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/50 with microprocessors or computers

Abstract

In a dialysis apparatus the blood pressure is normally monitored at intervals of 5 minutes. According to the invention the current blood pressure curve (33) is measured only during the first 45 minutes at intervals of 5 minutes and then compared with the stored blood pressure curves of previous treatments of the same patient. On the basis of statistical analyses that blood pressure curve is determined from a data storage, which shows the largest similarity to the current blood pressure curve and used as the basic curve (35) for blood pressure control during the current treatment. During further treatment the blood pressure measurement is carried out at intervals from 15 minutes to 30 minutes. This considerably reduces the number of blood pressure measurements and the resultant discomfort of the patient.

Claims

1. Therapy means comprising:

a blood pressure meter (24) and a controller (23) for controlling the times of blood pressure measurement and for;

determining blood pressure values controlling the blood pressure as a function of the determined blood pressure values, wherein the blood pressure measurement is left undone at some times and the determined blood pressure values are substituted by hypothetical values gathered from a former blood pressure curve determined during a therapy session.

2. Therapy means according to claim 1, wherein the controller (23) carries out the following functions;

a) preparing and storing a collection of the time histories of the blood pressure determined during a plurality of therapy sessions,

b) carrying out successive blood pressure measurements during a therapy session to generate stored blood pressure curves and to obtain a current blood pressure curve (33),

c) determining, from the stored blood pressure curves, as a basic curve (35) a blood pressure curve which shows the largest similarity to the current blood pressure curve (33),

d) controlling the blood pressure utilizing values of the basic curve (35) for the actual blood pressure value.

3. Therapy means according to claim 1, wherein subsequent to function d) another measurement of the blood pressure is carried out and the new measured value is used as the actual blood pressure value for control purposes.

4. Therapy means according to claim 3, wherein after the new measurement a check of the previous blood pressure curve (33) for similarity to the stored blood pressure curves is carried out.

5. Therapy means according to claim 4, wherein the extent of similarity of the previous blood pressure curve (33) to a stored blood pressure curve decides upon the time interval up to the next measurement.

6. Therapy means according to claim 2, wherein use of the basic curve is inhibited when a lower limit value of the blood pressure is not reached and/or an upper limit value of the blood pressure is exceeded.