DIALYSIS SYSTEM INCLUDING MULTI-HEATER POWER COORDINATION

• US 20090206017A1
• Filed: 02/14/2008
• Published: 08/20/2009
• Est. Priority Date: 02/14/2008
• 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: Han, William W., Rohde, Justin
• Granted Patent: US 7,892,423 B2
• Time in Patent Office: Days
• US Class Current: 210/149
• CPC Class Codes: A61M 1/1656 Apparatus for preparing dialysates
• CPC Class Codes: A61M 1/166 Heating for sterilisation A61M1/1686
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media

Abstract

A dialysis system includes a first fluid heater, a second fluid heater, and a logic implementer configured to synchronize the duty cycles of the first and second heaters so that (i) power is not supplied to the first heater when power is supplied to the second heater and (ii) power is not supplied to the second heater when power is supplied to the first heater.

Claims

1. A dialysis system comprising:

a first fluid heater;

a second fluid heater; and

a logic implementer configured to synchronize the duty cycles of the first and second heaters so that (i) power is not supplied to the first fluid heater when power is supplied to the second heater and (ii) power is not supplied to the second fluid heater when power is supplied to the first heater.

2. The dialysis system of claim 1, the first fluid heater configured to heat a first fluid and the second fluid heater configured to heat a second, different fluid.

3. The dialysis system of claim 1, the first fluid heater configured to operate with a dialysis fluid preparation unit and the second fluid heater configured to operate with a dialysis fluid delivery unit.

4. The dialysis system of claim 1, the first fluid heater configured to operate with a water purification unit and the second fluid heater configured to operate with a dialysis fluid delivery unit.

5. The dialysis system of claim 1, the logic implementer configured to power the heaters using pulse width modulation.

6. The dialysis system of claim 1, the logic implementer configured to determine whether the first fluid heater needs power, and if so, determine if the second fluid heater is being provided power, and power the first fluid heater if the second fluid heater is not being powered.

7. The dialysis system of claim 6, the logic implementer further configured if the second fluid heater is being powered to wait until the second fluid heater is no longer being powered to power the first heater.

8. The dialysis system of claim 6, the logic implementer further configured to determine, if the first fluid heater does not need power, whether the second fluid heater needs power, and if so, power the second fluid heater.

9. The dialysis system of claim 1, the logic implementer configured to power the first fluid heater for a first predefined duration and then power the second fluid heater for a second predefined duration.

10. The dialysis system of claim 9, the logic implementer further configured to wait for a predefined period of time between the first and second durations.

11. The dialysis system of claim 9, the first and second durations being a same length of time.

12. The dialysis system of claim 9, the logic implementer further configured to power the first fluid heater again for the first duration after powering the second fluid heater for the second duration.

13. The dialysis system of claim 12, the logic implementer still further configured to wait for a period of time between the second duration and the second, first duration.

14. The dialysis system of claim 1, the first and second fluid heaters sized and configured to operate at fifty percent duty cycle or less.

15. The dialysis system of claim 1, the first fluid heater a master fluid heater, which is powered when needed, the second fluid heater a delegate fluid heater, which can be powered only when the first, master fluid heater is not being powered.

16. A dialysis system comprising:

a first fluid heater;

a second fluid heater;

a logic implementer configured to synchronize the duty cycles of the first and second heaters so that the first and second heaters are powered simultaneously as little as possible if a collective duty cycle of the first and second heater is greater then one-hundred percent.

17. The dialysis system of claim 16, the logic implementer configured to de-power one of the first and second fluid heaters at the instant that the other of the first and second fluid heater is powered.

18. The dialysis system of claim 16, the logic implementer further configured to not allow the first and second fluid heaters to be powered simultaneously if the collective duty cycle of the first and second fluid heaters is less than one-hundred percent.

19. The dialysis system of claim 16, the first fluid heater a master fluid heater, which is powered when needed, the second fluid heater a delegate fluid heater, which can be powered only when the first, master fluid heater is not being powered.

20. A dialysis system comprising:

a first fluid heater;

a second fluid heater;

a supplemental power source; and

a logic implementer configured to use the supplemental power source such that when the first and second heaters are powered simultaneously, a collective current draw does not exceed a maximum allowable current draw of a branch power source powering the system.

21. The dialysis system of claim 20, the first fluid heater powered via the branch power source and the second fluid heater powered via the supplemental power source.

22. The dialysis system of claim 20, the first and second fluid heaters configured to be powered by the branch power source when the first and second fluid heaters are not powered simultaneously, the logic implementer configured to use the supplemental power source when the first and second fluid heaters are powered simultaneously.