RENAL THERAPY BLOOD CLEANSING SYSTEM WITH ISOLATION FEATURE

• US 20130204173A1
• Filed: 03/15/2013
• Published: 08/08/2013
• Est. Priority Date: 12/16/2003
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Kelly, Thomas D., El Sayyid, Waleed M.
• Granted Patent: US 9,211,370 B2
• Time in Patent Office: Days
• US Class Current: 604/6.09
• CPC Class Codes: A61M 1/1601 Control or regulation
• CPC Class Codes: A61M 1/1635 with volume chamber balancing devices between used and fresh dialysis fluid
• CPC Class Codes: A61M 1/1672 using membrane filters, e.g. for sterilising the dialysate
• 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 1/34 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 1/3413 Diafiltration
• 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 1/3462 Circuits for the preparation thereof
• 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 1/3647 with recirculation of the priming solution
• CPC Class Codes: A61M 1/3649 using dialysate as priming or rinsing liquid
• CPC Class Codes: A61M 2205/3303 Using a biosensor
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/7518 bacterial

Abstract

A renal therapy blood cleansing system is provided. The renal therapy blood cleansing system includes a blood filtering device in fluid communication with a blood circuit, a balance chamber configured to exchange like volumes of fresh and used therapy fluid with the blood filtering device, a first pump configured to pump fresh fluid to the balance chamber, a second pump positioned and arranged to receive used fluid from the blood filtering device, and a control scheme. The control scheme is programmed to isolate the blood filtering device from the second pump and deliver a volume of fresh fluid to the blood filtering device via the balance chamber while the second pump is isolated from the blood filtering device, so as to increase fluid volume within the blood circuit.

Claims

1. A renal therapy blood cleansing system comprising:

a blood filtering device in fluid communication with a blood circuit;

a balance chamber configured to exchange like volumes of fresh and used therapy fluid with the blood filtering device;

a first pump configured to pump fresh fluid to the balance chamber;

a second pump positioned and arranged to receive used fluid from the blood filtering device; and

a control scheme programmed to (i) isolate the blood filtering device from the second pump and (ii) deliver a volume of fresh fluid to the blood filtering device via the balance chamber while the second pump is isolated from the blood filtering device so as to increase fluid volume within the blood circuit.

2. The renal therapy blood cleansing system of claim 1, wherein the volume of fresh fluid is to compensate for a volume of fluid pumped from the blood filtering device being greater than a volume of fluid pumped to the blood filtering device.

3. The renal therapy blood cleansing system of claim 1, wherein the volume of fresh fluid is to provide a bolus volume, rinseback volume or prime volume.

4. The renal therapy blood cleansing system of claim 1, which includes at least one valve to isolate the blood filtering device from the second pump.

5. The renal therapy blood cleansing system of claim 4, wherein the at least one valve is located between the blood filtering device and the second pump.

6. The renal therapy blood cleansing system of claim 4, wherein the at least one valve is pneumatically controlled.

7. The renal therapy blood cleansing system of claim 1, wherein the second pump is located between the blood filtering device and the balance chamber.

8. The renal therapy blood cleansing system of claim 1, which includes a plurality of balance chambers, each balance chamber in communication with the first and second pumps.

9. The renal therapy blood cleansing system of claim 8, wherein the plurality of balance chambers form part of a match flow equalizer.

10. The renal therapy blood cleansing system of claim 1, which includes an ultrafiltration removal meter configured to remove a known volume of used therapy fluid from the blood filtering device.

11. The renal therapy blood cleansing system of claim 1, which includes an ultrafilter located upstream of the blood filtering device.

12. A renal therapy blood cleansing system comprising:

a blood circuit including a blood filtering device;

first and second balance chambers;

a first pump to pump fresh therapy fluid to the first and second balance chambers;

a second pump positioned and arranged to receive used fluid from the blood filtering device and to pump the used fluid to the first and second balance chambers; and

a control scheme programmed to isolate the second pump from the blood filtering device and to deliver a volume of fresh fluid to the blood filtering device via one of the balance chambers so as to increase fluid volume within the blood circuit.

13. A medical fluid method comprising:

infusing medical fluid into a blood filtering device communicating with a blood circuit using a first pump and a balance chamber that balances the amount of fresh and used treatment fluid delivered to and removed from the blood filtering device;

removing fluid from the blood filtering device using a second pump and the balance chamber;

isolating the blood filtering device from the second pump; and

delivering a volume of fresh medical fluid to the blood circuit while the blood filtering device is isolated from the second pump so as to increase fluid volume within the blood circuit.

14. The medical fluid method of claim 13, which includes delivering the volume of fresh fluid to compensate for a volume of fluid removed from the blood filtering device.

15. The medical fluid method of claim 13, which includes delivering the volume of fresh fluid for priming, rinseback or a patient bolus.

16. The medical fluid method of claim 13, which includes closing at least one valve to isolate the blood filtering device from the second pump.

17. The medical fluid method of claim 18, which includes pneumatically closing the at least one valve.

18. The medical fluid method of claim 13, which additionally includes bypassing the blood filtering device to deliver the volume of fresh medical fluid to the blood circuit.

19. The medical fluid method of claim 13, which includes resuming the infusing and removing steps after the volume of fresh medical fluid has been delivered.

20. The medical fluid method of claim 13, which includes enabling the volume of fresh fluid delivered to be selected proximate to the time of delivery.

21. The medical fluid method of claim 13, which includes enabling the volume of fresh fluid delivered to be preselected.

22. The medical fluid method of claim 13, which includes enabling the volume of fresh fluid delivered to be controlled automatically by delivering the volume until receiving an input from a sensor.

23. The medical fluid method of claim 13, wherein the infusing and removing steps include performing predilution infusion, postdilution infusion or both simultaneously.

24. The medical fluid method of claim 13, which includes delivering the volume automatically upon receipt of an input from a biosensor, the biosensor selected from the group consisting of a hematocrit sensor, a blood volume sensor, an electrolytic sensor, an oxygen sensor and any combination thereof.

25. The medical fluid method of claim 13, wherein delivering the volume of fresh medical fluid to the blood circuit includes delivering the fresh medical fluid to the blood filter.