Method for heating medical fluid using multi-input voltage capable heater
First Claim
1. A method for heating medical fluid using first and second heater elements, the method comprising:
- detecting a supply voltage applied to first and second power lines in electrical communication with first, second and third switches located between the power lines and the first and second heater elements;
if the supply voltage applied to the first and second power lines is a first nominal voltage, placing the first and second heater elements in series via the first switch; and
if the supply voltage applied to the first and second power lines is a second nominal voltage, placing the first and second heater elements in parallel via the second and third switches.
1 Assignment
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Accused Products
Abstract
A method for heating medical fluid with different supply voltages comprising: configuring first, second and third switches in electrical communication with first and second power lines, the switches configured such that (i) in a first switch state first and second heater elements are placed in series, solely via a closing of the first switch, for operation with a first supply voltage applied to the first and second power lines, and (ii) in a second switch state the first and second heater elements are placed in parallel, via the second and third switches, for operation with a second supply voltage applied to the first and second power lines, and configuring a control element to automatically set the switches in the first or the second switch state based upon a signal sent to the control element indicative of the first or the second supply voltage.
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Citations
22 Claims
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1. A method for heating medical fluid using first and second heater elements, the method comprising:
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detecting a supply voltage applied to first and second power lines in electrical communication with first, second and third switches located between the power lines and the first and second heater elements; if the supply voltage applied to the first and second power lines is a first nominal voltage, placing the first and second heater elements in series via the first switch; and if the supply voltage applied to the first and second power lines is a second nominal voltage, placing the first and second heater elements in parallel via the second and third switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for heating medical fluid using first and second heater elements, the method comprising:
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detecting a supply voltage applied to first and second power lines in electrical communication with first, second and third switches located between the power lines and the first and second heater elements; (a) if the supply voltage applied to the first and second power lines is a first nominal voltage, placing the first and second heater elements in series; (b) if the supply voltage applied to the first and second power lines is a second nominal voltage, placing the first and second heater elements in parallel; and (c) opening at least one of the first, second and third switches before making a switch closure contact in (a) or (b) to deter short circuiting. - View Dependent Claims (16, 17, 18)
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19. A method for heating medical fluid using first and second heater elements, the method comprising:
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detecting a supply voltage applied to first and second power lines in electrical communication with first, second and third switches located between the power lines and the first and second heater elements (i) if the supply voltage applied to the first and second power lines is a first nominal voltage, activating at least one of the switches to place the first and second heater elements in series; (ii) if the supply voltage applied to the first and second power lines is a second nominal voltage, activating at least one of the switches to place the first and second heater elements in parallel; and (iii) if the supply voltage changes from one of the first or second nominal voltages to the other of the first or second nominal voltages, deactivating at least one of the switches before activating the at least one of the switches in (i) or (ii) to deter short circuiting. - View Dependent Claims (20, 21)
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22. A method for heating a medical fluid solution operable with either nominal 120 or 240 VAC line voltages comprising:
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detecting whether the line voltage is nominally 120 or 240 VAC; and switching states of individual triodes for alternating current (“
TRIACs”
) in an array of TRIACs connected to an array of heating elements to form a current path through the array of heating elements specific to the detected nominal 120 or 240 VAC line voltage, so that the array of heating elements warms the medical fluid solution at approximately the same rate regardless of whether the nominal line voltage is 120 or 240 VAC.
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Specification