Device and method for blood treatment with single needle operation

Patent metadata

Field	Value
Publication number	US-9511181-B2
Application number	US-60290608-A
Country	US
Kind code	B2
Filing date	May 31, 2008
Priority date	Jun 4, 2007
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The present invention relates to a device and a method for blood treatment in a single-needle operating mode. The blood treatment device has an extracorporeal blood circuit comprising a blood supply line leading to the inlet of a blood treatment unit and a blood return line leading away from the outlet of the blood treatment unit. Blood collecting means, for example a blood collecting container, is provided in the blood return line, said means being connected to means for storing gas, for example an air reservoir, by a flow line. The flow connection comprises two line branches, one branch being used to transfer gas from the air reservoir into the blood collecting container and the other branch being used to transfer gas from the blood collecting container into the air reservoir. The connection branch for transferring gas from the air store into the blood collecting container contains means for compressing air, for example a compressor. The device according to the present invention may be operated in such a way that the filling level of the means for collecting blood can be determined as precisely as possible.

First claim

The invention claimed is:

1. A device for blood treatment in a single-needle operation, comprising:
a pump configured to convey blood in an extracorporeal blood circuit to a blood container configured to collect blood, whereby the extracorporeal blood circuit has a blood supply line leading to an inlet of a blood treatment unit and a blood return line departing from an outlet of the blood treatment unit, and the blood container has a closed-off volume;
a gas container having a closed-off volume;
a first connection path for connecting the blood container to the gas container in such a way that, in an arterial phase, gas expelled from the blood container during the filling of the blood container is transferred to the gas container, the first connection path containing a valve configured to interrupt the connection;
a second connection path, containing a gas compressor, for connecting the gas container to the blood container in such a way that, for the purpose of emptying the blood container, gas stored in the gas container is transferred by the gas compressor to the blood container, so that blood can be fed to the extracorporeal blood circuit in the arterial phase and removed from the extracorporeal blood circuit in the venous phase; and
a computing arrangement configured to determine blood volume V blood enclosed in the blood container, wherein the computing arrangement includes:
a first pressure transmitter configured to measure the pressure in the blood container;
a second pressure transmitter configured to measure the pressure in the first and second connection paths between the blood container and the gas compressor; and
a third pressure transmitter for measuring the pressure in the gas container,
wherein the computing arrangement is configured to calculate the blood volume V blood on the basis of a) the measured pressure in the closed-off volume of the blood container, b) the closed-off volume of the first and second connection paths between blood container and the gas compressor, and c) the closed-off volume of the as container.

2. The blood treatment device according to claim 1 , wherein:
the first connection path includes a bypass line bypassing the gas compressor, a bypass valve being disposed in the bypass line; and
the second connection path includes a gas line for conveying gas, the gas line connecting the blood container to the gas container, the gas compressor being disposed in the gas line.

3. The blood treatment device according to claim 2 , wherein the gas line includes a first line segment that connects the blood container to a pressure-side of the gas container, and a second line segment that connects a suction-side of the gas compressor to the gas container, a ventilation valve being provided for the ventilation/deaeration of the first line segment.

4. The blood treatment device according to claim 1 , wherein the blood container has a predetermined volume and is disposed in the blood return line of the extracorporeal circuit.

5. The blood treatment device according to claim 1 , wherein the gas container has a predetermined volume.

6. The blood treatment device according to claim 1 , wherein the pump is a blood pump disposed in the blood supply line.

7. The blood treatment device according to claim 1 , further comprising a control unit configured to change over between the arterial phase and the venous phase, the control unit configured such that
the pump is operated in the arterial phase, whereby the blood container is connected via the first connection path to the gas container, so that gas expelled from the blood container during the filling of the blood container is transferred to the gas container, and
the gas compressor is operated in the venous phase, wherein the gas container is connected via the second connection path to the blood container, so that, for the purpose of emptying the blood container, gas stored in the gas container is transferred by the gas compressor to the blood container.

8. The blood treatment device according to claim 7 , wherein the control unit is configured such that, in the arterial phase, the valve for interrupting the first connection path is actuated in a first time interval in such a way that the first connection path is not interrupted, and the valve for interrupting the first connection path is actuated in a second time interval in such a way that the first connection path is interrupted.

9. A device for blood treatment in a single-needle operation, comprising:
a blood treatment unit including an inlet and an outlet;
an extracorporeal blood circuit including a blood supply line leading to the inlet of a blood treatment unit and a blood return line departing from the outlet of the blood treatment unit;
a blood container configured to collect blood in the extracorporeal circuit, the blood container having a closed-off volume;
a pump configured to convey blood in the extracorporeal circuit to the blood container;
a gas container configured to store gas, the gas container having a closed-off volume; and
a computing arrangement configured to determine blood volume V blood enclosed in the blood container, wherein the computing arrangement includes:
a first pressure transmitter configured to measure the pressure in the blood container;
a second pressure transmitter configured to measure the pressure in the first and second connection paths between the blood container and the gas compressor; and
a third pressure transmitter for measuring the pressure in the gas container,
wherein the computing arrangement is configured to calculate the blood volume V blood on the basis of a) the measured pressure in the closed-off volume of the blood container, b) the closed-off volume of the first and second connection paths between blood container and the gas compressor, and c) the closed-off volume of the gas container,

wherein
the blood container is connected, via a first connection path having a valve for interrupting the connection, to the gas container in such a way that, in an arterial phase, gas expelled from the blood container during the filling of the blood container is transferred to the gas container, and
the blood container is connected, via a second connection path having a gas compressor, to the gas container in such a way that, for the purpose of emptying the blood container in a venous phase, gas stored in the gas container is transferred by the gas compressor to the blood container,
so that blood can be fed to the extracorporeal blood circuit in the arterial phase and blood can be removed from the extracorporeal blood circuit in the venous phase.

10. The device according to claim 9 , wherein:
the first connection path includes a bypass line bypassing the gas compressor, a bypass valve being disposed in the bypass line; and
the second connection path includes a gas line for conveying gas, the gas line connecting the blood container to the gas container, the gas compressor being disposed in the gas line.

11. The device according to claim 10 , wherein the gas line includes a first line segment that connects the blood container to a pressure-side of the gas container, and a second line segment that connects a suction-side of the gas compressor to the gas container, a ventilation valve being provided for the ventilation/deaeration of the first line segment.

12. The device according to claim 9 , wherein the blood container has a predetermined volume and is disposed in the blood return line of the extracorporeal circuit.

13. The device according to claim 9 , wherein the gas container has a predetermined volume.

14. The device according to claim 9 , wherei

Assignees

• Günther Goetz
• Günther Andrea
• Günther Richard Robert Bernd
• Günther Gesa Dagmar
• Herrenbauer Michael
• Lauer Martin
• MüLLER RALF
• Fresenius Medical Care Deutschland Gmbh

Inventors

• Günther Goetz
• Herrenbauer Michael
• Lauer Martin
• MüLLER RALF

Classifications

• A61M2205/3337

  Controlling, regulating pressure or flow by means of a valve by-passing a pump · CPC title

• A61M2205/3368

  Temperature · CPC title

• A61M2205/07

  having air pumping means · CPC title

• A61M1/308

  Volume control, e.g. with open or flexible containers, by counting the number of pump revolutions, weighing · CPC title

• A61M1/307

  Time control · CPC title