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Physiological fluid warmer

  • US 5,254,094 A
  • Filed: 08/16/1990
  • Issued: 10/19/1993
  • Est. Priority Date: 07/17/1989
  • Status: Expired due to Fees
First Claim
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1. In combination with a source of a physiological fluid, a venous entry device for infusion of said physiological fluid into a patient at an infusion site, and a source of heat transfer fluid maintained at a preselected temperature, the improvement comprising:

  • a chamber having an exterior surface adapted to be attached to and supported by said patient such that said chamber may rest upon a skin surface of said patient at said infusion site,means defining a fluid-tight interior in said chamber including walls defining an exterior surface of said chamber,means for conveying said heat transfer fluid from and to said source thereof to and from, respectively, said interior of said chamber,a continuous single length of tubing positioned within said interior of said chamber,said tubing having an interior surface defining a continuous, fluid-tight passage therethrough out of fluid contact with said interior of said chamber and an exterior surface in heat transfer relationship with a heat transfer fluid conveyed through said interior of said chamber,said tubing further including opposing ends wherein one of said ends of said tubing defines an upstream end located adjacent to one of said walls to define an entry point for said physiological fluid through one of said chamber walls and into said tube and wherein the other of said ends defines a downstream end located adjacent to one of said walls to define an exit point for said physiological fluid through one of said chamber walls and out of said tube,means for conveying said physiological fluid from said source thereof to said upstream end of said tubing for flow through said passage,means for conveying said physiological fluid from said downstream end of said tubing to said venous entry device wherein said means for conveying physiological fluid to and from said tubing define continuous fluid-tight passages passing through said chamber walls and connected to respective ends of said single length of tubing, andsaid means for conveying said physiological fluid from said downstream end of said tubing having a length of less than one foot from said downstream end of said tubing to said venous entry device, such that the heat lost by said physiological fluid after leaving said chamber is minimized.

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