Medical device heaters and methods
First Claim
Patent Images
1. A dialysis machine comprising:
- a pump for pumping a medical liquid;
a heater for heating the medical liquid, the heater havingat least one heating element anda heating control unit, which is configured to be connected to mains AC voltage, connected to the heater,the heating control unit comprisinga monitoring arrangement configured to recognize zero crossings of the mains AC voltage and to detect a level of the mains AC voltage anda switching arrangement configured to switch the at least one heating element on or off in the zero crossing,wherein the heating control unit is configured to control power of the heater by switching on and off one or more half cycles of the mains AC voltage,a temperature sensor,wherein the heating control unit is configured to set a ratio of a number of half cycles with a switched on heating element to a number of half cycles with a switched off heating element based on a signal of the temperature sensor and the detected level of the mains AC voltage.
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Abstract
A medical device having a heater with at least one heating element which has mains voltage applied to it by a heating control unit. The heating control unit includes a monitoring arrangement and a switching arrangement. The monitoring arrangement can recognize the zero crossings of the mains voltage, and the switching arrangement can switch the at least one heating element on or off in the zero crossing. The heating control unit controls the power of the heating by switching on and off of one or more half cycles of the mains AC voltage.
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Citations
25 Claims
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1. A dialysis machine comprising:
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a pump for pumping a medical liquid; a heater for heating the medical liquid, the heater having at least one heating element and a heating control unit, which is configured to be connected to mains AC voltage, connected to the heater, the heating control unit comprising a monitoring arrangement configured to recognize zero crossings of the mains AC voltage and to detect a level of the mains AC voltage and a switching arrangement configured to switch the at least one heating element on or off in the zero crossing, wherein the heating control unit is configured to control power of the heater by switching on and off one or more half cycles of the mains AC voltage, a temperature sensor, wherein the heating control unit is configured to set a ratio of a number of half cycles with a switched on heating element to a number of half cycles with a switched off heating element based on a signal of the temperature sensor and the detected level of the mains AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a dialysis machine comprising a pump for pumping a medical liquid and a heater for heating the medical liquid, the method comprising:
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detecting zero crossings and a level of a mains AC voltage; and switching at least one heating element of the heater on or off in the zero crossing, wherein a power of the heater is controlled based on a number of the half cycles of the mains AC voltage with a switched on heating element, wherein a level of the mains AC voltage is detected, and wherein a ratio of the number of the half cycles with a switched on heating element to a number of a half cycles with a switched off heating element is set based on a signal of the detected level of the mains AC voltage.
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14. A dialysis machine comprising:
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a pump for pumping a medical liquid; a heater for heating the medical liquid, the heater having at least one heating element and a heating control unit, which is configured to be connected to mains AC voltage, connected to the heater, the heating control unit comprising a monitoring arrangement configured to recognize zero crossings of the mains AC voltage and to detect a level of the mains AC voltage and a switching arrangement configured to switch the at least one heating element on or off in the zero crossing, wherein the heating control unit is configured to control power of the heater by switching on and off one or more half cycles of the mains AC voltage, wherein the heating control unit is configured to set a ratio of a number of half cycles with a switched on heating element to a number of half cycles with a switched off heating element based on the detected level of the mains AC voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification