Blood treatment device and disposable kit for a blood treatment device

• US 20020041825A1
• Filed: 08/27/2001
• Published: 04/11/2002
• Est. Priority Date: 08/29/2000
• 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: Scheunert, Peter, Beden, Josef, Weis, Manfred, Lauer, Martin, Herklotz, Martin, Hahmann, Uwe, Manke, Joachim
• Granted Patent: US 6,645,166 B2
• Time in Patent Office: Days
• US Class Current: 422/44
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/30 Single needle dialysis ; Reciprocating systems, alternately withdrawing blood from and returning it to the patient, e.g. single-lumen-needle dialysis or single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 1/302 having a reservoir for withdrawn untreated blood
• CPC Class Codes: A61M 1/303 having a reservoir for treated blood to be returned
• CPC Class Codes: A61M 1/3621 Extra-corporeal blood circuits single-needle circuits A61M1/30
• CPC Class Codes: A61M 1/3622 with a cassette forming partially or totally the blood circuit
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 2205/128 with incorporated valves

Abstract

A blood treatment device, in particular a dialysis machine, which permits both single-needle and dual-needle operation. The device has a blood treatment unit, in particular a dialyzer that has an inlet connected to a feed line and an outlet connected to a return line. The feed line has two parallel line branches with a positive displacement pump being connected into the first and second line branches. To produce a fluid connection between the outlet of the dialyzer and one of the two pumps, a connection line is provided. For dual-needle operation, the feed and return lines are connected to an arterial and a venous needle. For single-needle operation, the feed and return lines are brought together and connected to a common needle. The connection line permits single-needle operation without great changes to the structure of the blood treatment device.

Claims

1. A blood treatment device comprising:

a blood treatment unit having an inlet and an outlet;

a feed line connected to the inlet of the blood treatment unit, the feed line having a first branch line and a second branch line;

a return line connected to the outlet of the blood treatment unit;

a first positive displacement pump connected in the first line branch, the first pump divides the line branch into a first section and a second section, a first closure member provided in the first section of the first line branch, a second closure member provided in the second section of the first line branch;

a second positive displacement pump connected in the second line branch, the second pump divides the second line branch into a first section and a second section, a third closure member provided in the first section of the second line branch, a fourth closure provided in the second section of the second line branch; and

a connection line that connects the outlet of the blood treatment unit to one of the first line branch and the second line branch, a fifth closure member provided in the connection line.

2. The blood treatment device as claimed in claim 1, wherein the connection line connects the return line to the second section of the second line branch.

3. The blood treatment device as claimed in claim 1, further comprising:

a common blood line connecting the feed line and the return line;

a needle attached to the common blood line;

an additional closure member provided in the return line;

a control unit provided for opening and closing the closure members and for activating the first pump and the second pump, the control unit designed so that

during a first phase, the first pump and the second pump are configured to conduct an intake operation, the first closure member is open, the second closure member is open, the fifth closure member is open, the third closure member is closed, the fourth closure member is closed, and the additional closure member is closed, and

during a second phase, the first pump and the second pump are configured to conduct a delivery operation, the second closure member is open, the fifth closure member is open, the additional closure member is open, the first closure member is closed, the third closure member is closed, and fourth closure is closed.

4. The blood treatment device as claimed in claim 3, wherein the first closure member is closed, the second closure member is closed, the third closure member is closed, the fourth closure member is closed, and the fifth closure member is closed, when the first pump and the second pump are changed from the intake operation to the delivery operation.

5. The blood treatment device as claimed in claim 1, further comprising:

a needle attached to the feed line,

a control unit provided for opening and closing the closure members and for activating the pumps, the control unit designed so that

during a first phase, the first pump and the second pump are configured to conduct an intake operation, the first closure member is open, the second closure member is open, and the fifth closure member is open, the third closure member is closed, and the fourth closure member is closed, and

during a second phase, the first pump and the second pump are configured to conduct a delivery operation, the second closure member is open, the third closure member is open, the fifth closure member is open, the first closure member is closed, and the fourth closure member is closed.

6. The blood treatment device as claimed in claim 5, wherein the first closure member is closed, the second closure member is closed, the third closure member is closed, the fourth closure member is closed, and the fifth closure member is closed, when the first pump and the second pump are changed from the intake operation to the delivery operation.

7. The blood treatment device as claimed in claim 1, further comprising

an arterial needle attached to the feed line;

a venous needle attached to the return line;

a control unit provided for opening and closing the closure members and activating the pumps, the control unit designed so that

during a first phase, the first pump is configured to conduct an intake operation and the second pump is configured to conduct a delivery operation, the first closure member is open, the fourth closure member is open, the second closure member is closed, the third closure member is closed, and the fifth closure member is closed, and

during a second phase, the first pump is configured to conduct a delivery operation and the second pump is configured to conduct an intake operation, the second closure member is open, the third closure member is open, the first closure member is closed, the fourth closure member is closed, and the fifth closure members is closed.

8. The blood treatment device as claimed in claim 7, wherein the first closure member is closed, the second closure member is closed, the third closure member is closed, the fourth closure member is closed, and the fifth closure member is closed, when the first pump is changed from intake operation to delivery operation and the second pump is changed from delivery operation to intake operation.

9. The blood treatment device as claimed in claim 1, wherein the closure members are electromagnetic actuable clamp devices.

10. The blood treatment device as claimed in claim 1, wherein the closure members are pneumatically actuable clamp devices.

11. The blood treatment device as claimed in claim 1, wherein the first pump is a diaphragm pump and the second pump is a diaphragm pump.

12. The blood treatment device as claimed in claim 1, wherein the first pump and the second pump each respectively has a pump chamber that is designed as a replaceable unit, the pump chamber of the first pump connected into the first line branch of the feed line and the pump chamber of the second pump connected into the second line branch of the feed line.

13. The blood treatment device as claimed in claim 12, wherein the feed line, the return line, the connection line, and the pump chambers of the first and second pumps are designed as a disposable kit.

15. The disposable kit as claimed in claim 14, further comprising:

a first connector provided at a free end of the feed line for attachment of a needle, and

a second connector provided at a free end of the return line for attachment of a needle.

16. The disposable kit as claimed in claim 14, further comprising:

a Y-connection piece configured for connection to a free end of the return line and a free end of the feed line, the Y-connection piece for attachment of a needle.

14. A disposable kit for a blood treatment device, comprising:

a feed line that has two parallel line branches;

a return line;

a first pump chamber connected into the first line branch;

a second pump chamber connected into the second line branch; and

a connection line that connects the return line to one of the first line branch and the second line branch.