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Electric blood warmer utilizing heating by condensation

  • US 5,013,889 A
  • Filed: 01/05/1990
  • Issued: 05/07/1991
  • Est. Priority Date: 06/16/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for warming blood for transfusion comprising:

  • (A) at least one heating unit including;

    (1) a rigid metal housing having walls, vertically disposed, enclosing a hermetically sealed air-free space having a lower liquid phase evaporation region containing an evaporatable liquid and an upper vapor phase condensation region, one flat wall adjacent said condensation region functioning as a heating plate by transferring heat from vapor therein,(2) external etched foil electric heating means adjacent said evaporation region for generating vapor from said liquid, and(3) temperature sensing means adjacent said condensation region for sensing the temperature of vapor therein,(B) means for connecting said etched foil electric heating means to a source of electric power,(C) control means responsive to said temperature sensing means to control the amount of heat supplied by said eldered foil electric heating means to said heating unit liquid phase evaporation region, and(D) means for passing blood in conductive heat transference contact with said heating plate.

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