On June 07, 2016 , the USPTO issued U.S. Patent Number 9,358,331 to Fresenius Medical Care Holdings, Inc., which was successfully prosecuted by Novel IP.
The '331 patent is directed towards a portable dialysis machine having a detachable controller unit and base unit with an improved reservoir heating system. The controller unit includes a door having an interior face, a housing with a panel, where the housing and panel define a recessed region configured to receive the interior face of the door, and a manifold receiver fixedly attached to the panel. The base unit has a reservoir with an internal pan and external pan, separated by a space that holds a heating element. The heating element is electrically coupled to electrical contacts attached to the external surface of the external pan.
Independent Claim 1 describes " A dialysis machine having a reservoir unit wherein said reservoir unit comprises: a first housing having an external surface and an internal surface and defining a first volume adapted to hold a fluid therein; a second housing having an external surface and an internal surface and defining a second volume adapted to house the first housing with a space between the external surface of the first housing and the internal surface of the second housing, wherein said first housing is fused to said second housing; a heating element, configured to generate heat, positioned within the space between the external surface of the first housing and the internal surface of the second housing; and a first plurality of electrical contacts attached to the external surface of the second housing and electrically coupled to the heating element. "