TREATMENT DEVICE WITH MEMORY-SUPPORTED CONTROL MEANS

• US 20100016776A1
• Filed: 09/11/2007
• Published: 01/21/2010
• Est. Priority Date: 09/15/2006
• Status: Active Grant

• Current Assignee: B. Braun Avitum AG (B. Braun Holding GmbH & Co. KG)
• Original Assignee: B.Braun Medizintechnologie GmbH
• Inventors: Röher, Otfried, Korth, Steffen
• Granted Patent: US 8,556,819 B2
• Time in Patent Office: Days
• US Class Current: 604/5.10
• CPC Class Codes: A61M 1/34 Filtering material out of the blood by passing it through a membrane, i.e. hemofiltration or diafiltration
• CPC Class Codes: A61M 1/3403 Regulation parameters
• CPC Class Codes: A61M 1/341 by measuring the filtrate rate or volume
• 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 2205/52 with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence

Abstract

The therapy device stores the time profiles of the blood pressure and of other influencing variables during preceding therapy procedures. The time profile of the blood pressure and of other influencing variables during the actual therapy is also recorded. An analytical comparison is then made between the time profiles of the blood pressure and of other influencing variables during the actual measurement procedure and those during preceding therapy procedures. Depending on the comparison, a prospective blood pressure control is carried out in order to prevent drops in blood pressure in a subsequent time period.

Claims

1. A therapy device for extracorporeal blood treatment with settable target parameters such as e.g. total ultrafiltration volume, maximal ultrafiltration rate, length of treatment, by use of a blood-pressure measuring device and a memory-supported control means for controlling the blood pressure of a patient, wherein said memory-supported control means is configured to perform the following functions after a blood-pressure measurement:

a) detection and storage of the temporal development of the blood pressure during the actual therapy procedure;

b) analytical comparisons of the temporal development during the actual therapy procedure with temporal developments of preceding therapy procedures up to the actual point of time of the actual therapy procedure, and selection of preceding therapy procedures with high similarity in the blood-pressure development up to the actual point of time;

c) analyzing the developments of the blood pressure of said selected preceding therapy procedures in time periods following the actual point of time of the running therapy procedure for detection of drops in blood pressure, and selecting at least one of the preceding therapy procedures with a drop in blood pressure in the subsequent time periods;

d) prospective blood-pressure control for prevention of drops in blood pressure, wherein the temporal development of said at least one selected therapy procedure is used as a guide value of said prospective blood-pressure control in the time periods following the actual point of time.

2. The therapy device according to claim 1, wherein said control device is configured to repeatedly perform said functions b) and c) subsequently to each other.

3. The therapy device according to claim 1, wherein said control device is operative to decide from which preceding therapy procedures the guide value of the prospective blood-pressure control is to be taken over for the subsequent time period of the actual therapy procedure.

4. The therapy device according to claim 1, wherein

the temporal developments of blood-pressure-relevant influencing variables such as e.g. ultrafiltration rate, dialysate conductivity and infusion quantity, and the settable target parameters such as e.g. total ultrafiltration volume, maximal ultrafiltration rate and length of treatment of each therapy procedure are detected and stored;

and

at least one of said temporal developments of blood-pressure-relevant influencing variables from the selected preceding therapy procedures is used as an additional guide value of the prospective blood-pressure control in time periods following the actual point of time of the actual therapy procedure.

5. The therapy device according to claim 1, wherein the detection of a similarity of preceding therapy procedures to the actual therapy procedure is based on the time periods from the start of the therapy procedure up to the actual point of time, and/or on shorter time periods, e.g. 15 minutes prior to the actual point of time.

6. The therapy device according to claim 1, wherein, by the memory-supported control means, all or some of the following categories of blood-pressure values or blood-pressure-influencing variables are included in the prospective blood-pressure control:

blood-pressure values which are detected by interval-based measurements according to the time regime implemented in the control means,

blood-pressure values which are substituted in the form of guide curves from preceding therapy procedures for thus reducing the number of blood-pressure measurements,

blood-pressure values or blood-pressure-influencing variables which are automatically requested by measurement and analysis devices for other physiological values (e.g. ECG, relative blood volume, hemocrit, blood-oxygen content), and

blood-pressure values which are requested through manual input by the medical personnel.