METHOD FOR REMOVING BLOOD FROM AN EXTRACORPOREAL BLOOD CIRCUIT AS WELL AS APPARATUSES

• US 20130030346A1
• Filed: 07/27/2012
• Published: 01/31/2013
• Est. Priority Date: 07/29/2011
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius Medical Care AG)
• Original Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius Medical Care AG)
• Inventors: Gronau, Soeren, Haecker, Juergen, Mueller, Ralf, Weis, Manfred, Kreber, Stefan, Thys, Martin
• Granted Patent: US 8,915,876 B2
• Time in Patent Office: Days
• US Class Current: 604/6.09
• CPC Class Codes: A61M 1/342 Adding solutions to the blood, e.g. substitution solutions for preventing coagulation A61M1/3672
• 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 1/362262 Details of incorporated reservoirs
• CPC Class Codes: A61M 1/362266 Means for adding solutions or substances to the blood
• 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 2205/123 with incorporated reservoirs
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: Y10T 137/87571 Multiple inlet with single outlet

Abstract

The present invention relates to a method for removing blood from an extracorporeal blood circuit and/or a functional device, each connectable or connected with a blood treatment apparatus for the purpose of blood treatment of a patient. The blood treatment apparatus of the method comprises or is connected with at least one extracorporeal blood circuit with a line having interior portions, the extracorporeal blood circuit comprising at least one arterial line section and at least one venous line section, wherein a first section of the arterial line section is configured to be connected with a second section of the venous line section, and further comprises at least one blood pump for conveying blood within the line interior portions. The method includes the step of operating the blood pump in a second conveying direction which is opposite to a first customary conveying direction. It further relates to corresponding apparatuses.

Claims

1. A method for removing blood from an extracorporeal blood circuit and/or a functional device at the end of a blood treatment session, each of said extracorporeal blood circuit and/or functional device being connectable or connected with a blood treatment apparatus for the purpose of blood treatment of a patient,

wherein the blood treatment apparatus comprises or is connected with:

at least one extracorporeal blood circuit with a line having interior portions, wherein the extracorporeal blood circuit comprises at least one arterial line section and at least one venous line section, a first section of the arterial line section and a second section of the venous line section being connected or configured to be connected; and

,

at least one blood pump for conveying blood within the line interior portions of the extracorporeal blood circuit;

wherein the method comprises the step of;

operating the blood pump in a second conveying direction which is opposite to a first conveying direction of the blood pump which is customary during the blood treatment.

2. The method according to claim 1, wherein the blood treatment apparatus comprises at least one second conveying device for introducing second fluid into line interior portions of the extracorporeal blood circuit and/or for conveying a line content within line interior portions of the extracorporeal blood circuit, the method further comprising the step of:

introducing the second fluid into line interior portions of the extracorporeal blood circuit by operating the second conveying device after the first section of the arterial line section was connected with a second section of the venous line section.

3. The method according to claim 1, further comprising the steps of:

disconnecting an arterial needle connection of the arterial line section of the extracorporeal blood circuit from the patient; and

connecting the arterial needle connection of the extracorporeal blood circuit with a venous addition point of the venous line section of the extracorporeal blood circuit.

4. The method according to claim 2, wherein the second conveying device and the blood pump are started at the same time.

5. The method according claim 2, wherein a feed rate of the blood pump and a feed rate of the second conveying device are set such that the venous line section is not emptied before the arterial line section.

6. The method according to claim 2, wherein a feed rate of the blood pump is smaller than a feed rate of the second conveying device.

7. The method according to claim 2, wherein a feed rate of the blood pump and a feed rate of the second conveying device are monitored and/or regulated by means of pressure monitoring and/or pressure measurement and/or pressure limitation during removal of the blood.

8. The method according to claim 2, wherein a feed rate of the second conveying device is set according to the formula

9. The method according to claim 2, further comprising the step of:

setting a feed rate of the second conveying device such that at the venous addition point or at a point at which fluid from the venous line section and fluid from the arterial line section are joined or meet, blood and second fluid of the same dilution degree meet.

10. The method according to claim 2, further comprising the step of:

setting a feed rate of the blood pump and a feed rate of the conveying device individually for the utilized blood treatment device according to the formula

11. The method according to claim 10, wherein V_art_S_h and/or the factor F are or were determined experimentally once for an average patient hematocrit.

12. The method according to claim 2, further comprising the step of:

stopping the blood pump before second fluid is introduced into the venous line section of the extracorporeal blood circuit at the venous addition point, or before the second fluid reaches a point at which fluid from the venous line section and fluid from the arterial line section are joined or meet;

or

stopping the second conveying device before the second fluid is introduced into the venous line section of the extracorporeal blood circuit at the venous addition point, or before the second fluid reaches a point at which fluid from the venous line section and fluid from the arterial line section are joined or meet.

13. The method according to claim 3, further comprising the step of:

checking the connection of the arterial needle connection of the extracorporeal blood circuit with the venous addition point of the extracorporeal blood circuit.

14. The method according to claim 13, wherein checking comprises the steps of:

creating a pressure balance;

detecting a diastolic patient pressure; and

building up a negative pressure by means of the blood pump which is conveying in a first conveying direction or forward.

15. The method according to claim 3, wherein the venous addition point of the venous line section of the extracorporeal blood circuit leads into the venous line section upstream from a blood chamber and upstream from a clot catcher.

18. A blood-handling system, said blood-handling system comprising a control device or regulating device, suitable and provided and/or arranged and/or configured for executing a method according to claim 1.

19. The blood-handling system of claim 18, wherein the blood-handling system is configured as a hemodialysis apparatus, hemofiltration apparatus or hemodiafiltration apparatus.

20. A non-transitory computer-readable medium with an executable program stored thereon, wherein the program is configured to instruct a programmable computer system to execute the method according to claim 1.

16. A blood-handling system, said blood-handling system comprising:

a functional device comprising a venous line section and a venous addition point communicating therewith,

wherein the venous addition point is prepared and/or provided to be connected with an arterial needle connection of the arterial line section of the extracorporeal blood circuit.

17. The blood handling system according to claim 16, said blood handling system further comprising at least one extracorporeal blood circuit, wherein the arterial needle connection or a different section of the arterial line section of the extracorporeal blood circuit is prepared to be connected with the venous addition point of the functional device.