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CLINICAL FLUID WARMER

  • US 3,590,215 A
  • Filed: 03/27/1969
  • Issued: 06/29/1971
  • Est. Priority Date: 03/27/1969
  • Status: Expired due to Term
First Claim
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1. A dry heat clinical fluid warmer for use in warming refrigerated blood and other fluids to a safe usable transfusion temperature, at any flow rate from zero to a given maximum rate, comprising:

  • a first thermally conductive heat plate;

    a second thermally conductive heater plate;

    mounting means mounting said first and second heater plates for pivotal movement, relative to each other, between a closed position in which said heater plates are disposed in closely spaced parallel relation to each other and an open position in which said heater plates are disposed at a relatively wide angle to each other;

    a thin, flat, disposable fluid sac having inlet and outlet openings at opposite ends thereof;

    support means for removably supporting said sac in predetermined position on one of said heater plates, when the heater plates are in open position, opposite sides of said sac contacting said first and second heater plates, respectively, when said heater plates are in closed position and said sac is filled with fluid;

    first and second electrical heating elements, individually associated with said first and second heater plates, respectively, each of said heating elements being effectively tapered from the end thereof adjacent the sac inlet to the end adjacent the sac outlet so that the heat output of said heating elements gradually diminishes form the inlet end of said sac to the outlet end thereof in direct proportion to the diminishing rate of heat absorption by fluid moving from the sac inlet to the sac outlet, each heating element comprising at least two sections, arranged in sequence between the sac inlet and the sac outlet; and

    precision thermal control means, thermally connected to at least one of said heater plates and electrically connected to said heating elements, for controlling operation of said heating elements in accordance with the temperature of said heater plate, said control means including separate thermostats for controlling the respective sections of each heating element.

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