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Apparatus and method for positioning a sensor away from the blood vessel wall

  • US 5,284,138 A
  • Filed: 07/09/1991
  • Issued: 02/08/1994
  • Est. Priority Date: 07/09/1991
  • Status: Expired due to Fees
First Claim
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1. A probe assembly for inserting a probe through a lumen of a catheter and into a blood vessel, while maintaining a flow path through a catheter and positioning a distal end of the probe at a location spaced from a luminal surface of the blood vessel, wherein the catheter tends to lie along a lower vessel wall opposite a site of insertion, the probe assembly comprising:

  • a probe having means for sensing a parameter of the blood;

    a support tube having an outer diameter sized to be slidably engaged within the catheter lumen and a tube lumen which forms a fluid flow path through both the tube and catheter;

    the probe being disposed within the tube lumen and attached to an upper tube wall portion while maintaining the flow path along a lower tube wall portion;

    wherein the upper wall portion of the support tube may be aligned along an upper wall of the catheter so that the probe is spaced from said lower wall of the vessel.

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