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Tonometric catheter combination

  • US 5,174,290 A
  • Filed: 06/20/1991
  • Issued: 12/29/1992
  • Est. Priority Date: 03/22/1982
  • Status: Expired due to Term
First Claim
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1. A combination tonometric catheter and urinary catheter apparatus for measuring a liquid fluid or gaseous fluid property indicative of the condition of an internal organ of a human or other mammal in vivo, comprising:

  • (a) an elongated tube having a first lumen extending longitudinally therethrough, a portion of said tube being composed of a first elastomeric material that is substantially impermeable to one or more liquid fluids or gaseous fluids of interest, said fluids of interest including oxygen gases and carbon dioxide gases;

    (b) at least one walled sampling chamber on said tube in fluid communication with the interior of said first lumen, the wall of said sampling chamber being composed of a second elastomeric material that is freely and selectively permeable to said one or more liquid fluids or gaseous fluids of interest, said second material being substantially impermeable to other liquid fluids or gaseous fluids;

    (c) means for positioning said walled sampling chamber substantially in direct contact with a wall portion of said internal organ in order to allow at least one of said liquid fluids or gaseous fluids of interest from the tissue of the wall portion of the internal organ to permeate said walled sampling chamber; and

    (d) a second lumen extending longitudinally through said tube and being adapted for the delivery or draining of a fluid to or from the internal organ.

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