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HEART CATHETERIZATION DEVICE

  • US 3,581,733 A
  • Filed: 12/11/1968
  • Issued: 06/01/1971
  • Est. Priority Date: 12/30/1967
  • Status: Expired due to Term
First Claim
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1. A device for use in measuring blood characteristics such as blood pressure comprising A catheter tube for insertion into the bloodstream of a body, one end of which is to be placed at the point of measurement within the body, a connection member attached to the other end of said catheter tube, a transducer apparatus having a pressure chamber for picking up and converting pressure variations into proportional electrical voltage variations susceptible of measurement, a channel communicating between said pressure chamber and said connection member, a container for supplying a salt solution to said catheter, a tube communicating between said pressure chamber and said container, a capillary tube connected between said container and said channel for communicating said solution to said catheter and means for applying a pressure of approximately 300 mm. of mercury to the solution in the container, the dimensions of the capillary tube being such that a steady flow of solution is directed through said catheter tube at the rate of approximately 1 to 2 mls. per hour thereby preventing coagulation of blood in the tube so as to permit use thereof over prolonged periods of time.

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