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Intravascular blood parameter sensing system

  • US 5,335,658 A
  • Filed: 06/29/1992
  • Issued: 08/09/1994
  • Est. Priority Date: 06/29/1992
  • Status: Expired due to Fees
First Claim
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1. An assembly for the sensing of a blood parameter comprising:

  • a sensing element for sensing a parameter of blood and providing a signal in response thereto, and an elongated transmission member for transmitting said signal from said sensing element;

    a catheter having a proximal end, a distal end, and a lumen extending therethrough, said lumen having an opening in said distal end, said catheter being sized and adapted so that at least said distal end and said opening are receivable within a blood vessel of a patient, said sensing element being located within said lumen at a position away from said proximal end of said catheter and at least 4 mm proximal of said opening, said catheter being configured such that said catheter is capable of being connected to a flush solution source so as to allow for the introduction of flush solution into said lumen;

    a volume oscillator in fluid communication with said lumen, said volume oscillator being adapted to periodically cause blood from the blood vessel of the patient to move into and out of said lumen such that said sensing element is exposed to substantially exclusively blood for a portion of the time said volume oscillator is activated and to substantially exclusively said flush solution for another portion of the time said volume oscillator is activated; and

    means for calculating the value of said blood parameter based upon both the values sensed by said sensing element when exposed to substantially exclusively blood and when exposed to substantially exclusively said flush solution.

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