METHOD AND DEVICE FOR HEATING SOLUTIONS, PREFERABLY DIALYSIS SOLUTIONS

• US 20110000902A1
• Filed: 02/27/2009
• Published: 01/06/2011
• Est. Priority Date: 02/29/2008
• 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: Klatte, Stephan, Hedmann, Frank L.
• Granted Patent: US 8,350,195 B2
• Time in Patent Office: Days
• US Class Current: 219/494
• 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 1/1664 with temperature control
• CPC Class Codes: A61M 1/167 Flexible packaging for solid concentrates
• CPC Class Codes: A61M 1/287 Dialysates therefor
• CPC Class Codes: A61M 5/445 the media being heated in the reservoir, e.g. warming bloodbags

Abstract

The invention relates to a method and an apparatus for the heating of solutions, preferably dialysis solutions, to a wanted desired temperature, wherein a solution presented in a bag is heated on a heater system including a heater by means of a two-step control. In accordance with the present invention, the temperature forming the lower switch-on threshold of the heater and the temperature forming the upper switch-off threshold of the heater vary.

Claims

1. A method for the heating of solutions, preferably dialysis solutions, to a wanted desired temperature, wherein a solution presented in a bag is heated on a heater system including a heater by means of a two-step control,

characterized in that

the temperature forming the lower switch-on threshold of the heater and the temperature forming the upper switch-off threshold of the heater vary.

2. A method in accordance with claim 1, characterized in that the temperature T₁ of the bag containing the solution is measured by means of a first temperature sensor, whereas the temperature T₂ of a heating element arranged in the heater system is measured via a second temperature sensor.

3. A method in accordance with claim 1, characterized in that a previously fixed precontrol temperature T_V is used as the temperature T₂ forming the upper switch-off threshold.

4. A method in accordance with claim 1, characterized in that the precontrol temperature for discrete bag temperatures T₁ is determined in advance.

5. A method in accordance with claim 1, characterized in that the following steps take place iteratively in the two-point control:

measuring the temperature T₁ of the bag containing the solution;

setting the precontrol temperature T_V;

heating the heating element until the precontrol temperature T_V is reached.

6. A method in accordance with claim 1, characterized in that the precontrol temperature is selected such that an overshooting of the temperature beyond the maximum heater temperature T_max is not possible.

7. A method in accordance with claim 1, characterized in that the switch-on point for the switching on of the heating element is determined in that a predetermined ratio of the temperature T₂ forming the upper switch-off threshold to the temperature T₁ of the bag containing the solution is reached.

8. A method in accordance with claim 1, characterized in that the temperature T₁ of the bag containing the solution is determined when the influence of the heating element on the sensor measuring the temperature T₁ of the bag containing the solution has fallen below a limit value.

9. A method in accordance with claim 8, characterized in that the temperature T₁ of the bag containing the solution is determined from the gradient of the sensors measuring the temperatures.

10. A method for the heating of solutions, preferably dialysis solutions, to a wanted desired temperature, wherein a solution presented in a bag is heated on a heater system including a heater by means of a two-step control,

characterized in that

the heater system has means by means of which the temperature forming the lower switch-on threshold of the heater and the temperature forming the upper switch-on threshold of the heater is variable.

11. An apparatus in accordance with claim 10, characterized in that the means have stores in which discrete temperature values can be stored which correspond to the temperatures forming the upper switch-off threshold of the heater.

12. An apparatus in accordance with claim 10, characterized in that a first temperature sensor is embedded in the heating element of the heater system.

13. An apparatus in accordance with claim 10, characterized in that a temperature sensor is arranged on the heating element of the heater system.