Treatment device with memory-supported control means

• US 8,556,819 B2
• Filed: 09/11/2007
• Issued: 10/15/2013
• 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 Avitum AG (B. Braun Holding GmbH & Co. KG)
• Inventors: Korth, Steffen, Rher, Otfried
• Primary Examiner(s): HAND, MELANIE JO
• Application Number:
  US12/441,176
• Publication Number:
  US 20100016776A1
• Time in Patent Office: 2,226 Days
• Field of Search: 604/4.01, 604/5.01, 604/6.01, 210/645, 210/646, 600/485
• US Class Current: 600/485
• 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, comprising:

a blood-pressure measuring device and a memory-supported controller that controls blood pressure of a patient using settable treatment parameters, wherein said memory-supported controller is configured to perform the following functions during a current therapy procedure;

a) detecting and storing a temporal development of the blood pressure during the current therapy procedure;

b) analytically comparing the temporal development of the blood pressure up to a current point of time during the current therapy procedure with temporal developments of the blood pressure of preceding therapy procedures up to a respective point of time corresponding to the current point of time of the current therapy procedure;

c) selecting the temporal developments of the blood pressure of the preceding therapy procedures that are most similar up to the respective point of time to the temporal development of the blood pressure of the current therapy procedure up to the current point of time of the current therapy procedure;

d) analyzing the selected temporal developments of the blood pressure of the preceding therapy procedures to detect in the selected temporal developments of the blood pressure of the preceding therapy procedures a decrease in the blood pressure beyond the respective point of time;

e) choosing at least one of the selected temporal developments of the blood pressure of the preceding therapy procedures having the decrease in the blood pressure beyond the respective point of time; and

f) preventing a decrease in the blood pressure of the current therapy procedure, wherein the temporal development of the at least one the selected temporal developments of the blood pressure of the preceding therapy procedures beyond the respective point of time used as a guide value to prospectively control the blood-pressure in time periods beyond the current point of time of the current therapy procedure.

2. The therapy device according to claim 1, wherein said controller is configured to repeatedly perform functions (b)-(e).

3. The therapy device according to claim 1, wherein said controller is operative to decide from which preceding therapy procedures the guide value is to be taken over for the time period beyond the current point of time of the current therapy procedure.

4. The therapy device according to claim 1, wherein

temporal developments of blood-pressure-relevant influencing variables and the settable treatment parameters 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 in time periods following the current point of time of the current therapy procedure.

5. The therapy device according to claim 1, wherein the detection of a similarity of preceding therapy procedures to the current therapy procedure is based on the time periods from the start of the therapy procedure up to the current point of time of the current therapy procedure, and/or less than 20 minutes prior to the current point of time of the current therapy procedure.

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

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

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, and

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

7. The therapy device according to claim 4, wherein the blood-pressure-relevant influencing variables include at least one of ultrafiltration rate, dialysate conductivity, or infusion quantity.

8. The therapy device according to claim 4, wherein the settable treatment parameters include at least one of total ultrafiltration volume, maximum ultrafiltration rate, or length of treatment.