Method for returning blood from a blood treatment device, and device for carrying out this method

• US 20060079826A1
• Filed: 07/22/2003
• Published: 04/13/2006
• Est. Priority Date: 09/11/2002
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Original Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Inventors: Beden, Josef, Manke, Joachim
• Granted Patent: US 7,488,301 B2
• Time in Patent Office: Days
• US Class Current: 604/4.10
• CPC Class Codes: A61M 1/152 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/1524 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/15632 the filter being a dialyser
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/3401 Cassettes therefor
• CPC Class Codes: A61M 1/3434 with pre-dilution and post-dilution
• CPC Class Codes: A61M 1/3437 downstream of the filter, e.g. post-dilution with filtrate
• CPC Class Codes: A61M 1/36224 with sensing means or components thereof
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362264 the filter being a blood filter
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• CPC Class Codes: A61M 1/3643 Priming, rinsing before or after use
• CPC Class Codes: A61M 1/3644 Mode of operation
• CPC Class Codes: A61M 1/3646 Expelling the residual body fluid after use, e.g. back to the body
• CPC Class Codes: A61M 1/3649 using dialysate as priming or rinsing liquid
• CPC Class Codes: A61M 1/3652 using gas, e.g. air
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit

Abstract

The invention relates to a method for the return of blood from a blood treatment apparatus, preferably from a dialysis apparatus. In accordance with the invention, the substituate pump contained in the treatment apparatus displaces the blood by means of correspondingly transported substituate fluid until it is detected in corresponding detectors that substituate fluid is flowing back in the line instead of blood. From this moment in time, the blood volume is further displaced in a controlled manner until it has reached the line outlet of the corresponding line.

Claims

1. A method for the return of blood from a blood treatment apparatus comprising a blood treatment element, preferably a dialysis apparatus having a dialyzer, two lines with outlets, a blood pump, a first valve arranged in the first line, a second valve arranged in the second line and a predilution port for the feeding of substituate fluid, with a substituate supply line which is connected to the predilution port and into which a substitutate pump is interposed, characterized by the following steps:

the first valve in the first line is opened and the second valve arranged in the second line is closed;

the blood pump is set to feedthrough or it is also running while the substituate pump displaces the blood by means of transported substituate fluid;

the blood is further displaced in a volume-controlled manner until it has reached the line outlet of the first line;

the blood pump is closed or stopped, the first valve is closed and the second valve is opened;

the substituate pump displaces blood through the released second line and the blood treatment element by transported substituate fluid; and

the blood is further displaced in a volume-controlled manner until it has reached the line outlet of the second line.

3. A method in accordance with claim 1, wherein a highly precisely dispensing membrane pump is used as the substituate pump.

4. A method in accordance with claim 1, wherein the blood treatment element is a dialyzer in hemodiafiltration.

5. A method in accordance with claim 1, wherein the blood treatment element is a hemofilter in hemodiafiltration.

6. A method in accordance with claim 1, wherein it is detected via detectors that substituate fluid is flowing back instead of blood.

7. A method in accordance with claim 6, wherein optical detectors are used.

8. A method in accordance with claim 1, wherein the blood is largely pressed out of the blood pump.

9. An apparatus for carrying out a method in accordance with claim 1, characterized by a blood treatment element (12), a blood pump (14), a substituate pump (16), a first line (18) as an arterial blood line, a second line (20) as a venous blood line, valves (22, 24) and a control apparatus.

2. A method for the return of blood from a blood treatment apparatus comprising a blood treatment element, preferably a dialysis apparatus having a dialyzer, two lines with outlets, a blood pump, a first valve arranged in the first line, a second valve arranged in the second line and a postdilution port for the feeding of substituate fluid, with a substituate supply line which is connected to the postdilution port and into which a substituate pump is interposed, characterized by the following steps:

the first valve in the first line is opened and the second valve arranged in the second line is closed;

the blood pump is set to feedthrough or it is also running while the substituate pump displaces the blood through the blood treatment element and the first fline by means of transported substituate fluid;

the blood is further displaced in a volume-controlled manner until it has reached the line outlet of the first line;

the blood pump is closed or stopped, the first valve is closed and the second valve is opened;

the substituate pump displaces blood through the released second line by transported substituate fluid; and

the blood is further displaced in a volume-control, manner until it has reached the line outlet of the second line.

10. An apparatus in accordance with claim 10, wherein detectors (26, 28), preferably optical detectors, are arranged in the lines (18, 20).

11. Apparatus in accordance with claim 10, wherein the pumps (14, 16) are made as double pumps connected in parallel.