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Fluid warmer and method of operating a fluid warmer

  • US 9,435,478 B2
  • Filed: 08/13/2013
  • Issued: 09/06/2016
  • Est. Priority Date: 08/20/2012
  • Status: Active Grant
First Claim
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1. A fluid warmer for temperature control of a medical fluid guided in a fluid tube, the warmer comprising:

  • a resistance heating element for alternating voltage, said resistance heating element having a first and a second electrical supply connection conductor, wherein said first electrical supply connection conductor has a first switch and said second electrical supply connection conductor has a second switch;

    a heat transfer element which is thermally coupled to said resistance heating element;

    a functional grounding conductor, which is electrically conductively connected to said heat transfer element, said functional grounding conductor having a third switch;

    a sensor for determining a present magnitude of a leakage current via said functional grounding conductor; and

    a control device, said control device being structured to simultaneously switch said first, said second and said third switches into an open switching state within a defined time interval on occurrence of a leakage current that is greater than or equal to a defined maximum threshold current magnitude.

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