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Electronically-controlled heating device for infusion liquids

  • US 4,680,445 A
  • Filed: 09/06/1985
  • Issued: 07/14/1987
  • Est. Priority Date: 09/06/1984
  • Status: Expired due to Term
First Claim
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1. A device for heating infusion liquid, such as instillation liquid and blood transfusion liquid, to be injected to a human body, comprising:

  • a casing having an open top and a closed bottom, with an inlet cutout section and an outlet cutout section formed on one side wall thereof;

    a liquid heating bag removably mounted within said casing and having an inlet end for connection to a source of liquid, an outlet end for connection to a human body, and a flow passage extending between said inlet and outlet ends in a zigzag line, said heating bag being disposed within said casing with said inlet and outlet ends received in said inlet and outlet cutout sections of said casing, respectively;

    a first and a second heating plate mounted on the bottom of said casing, said first heating plate being adapted to heat a half part of the bag on the inlet side of said heating bag, and said second heating plate being adapted to heat the other half part of the bag on the outlet side of said heating bag;

    an openable cover connected to the top of said casing in coextensive relation thereto;

    a push plate mounted on the inner surface of said cover and adapted to hold said heating bag against said first and second heating plates;

    a first thermosensor located within said casing between said inlet cutout section and said first heating plate to measure temperature in the vicinity of the inlet of the bag;

    a second thermosensor located within said casing between said first heating plate and said second heating plate to measure temperature in the vicinity of the middle of the bag;

    a third thermosensor located within said casing between said second heating plate and said outlet cutout section to measure temperature in the vicinity of the outlet of the bag; and

    control means located within said casing for controlling heating rates of said first and second heating plates, said control means including means for controlling said first heating plate in accordance with the temperature of the liquid in the vicinity of the inlet of the bag and the middle of the bag, as measured by said first and second thermosensors, respectively, and said control means further including means for controlling said second heating plate in accordance with the temperature of the liquid in the vicinity of the outlet of the bag, as measured by said third thermosensor.

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