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CATHETER FOR MEASURING CHEMICAL PARAMETERS, IN PARTICULAR FOR INTRODUCING BIOLOGICAL TISSUES, LIQUIDS OR THE LIKE

  • US 20030060751A1
  • Filed: 01/07/2000
  • Published: 03/27/2003
  • Est. Priority Date: 04/09/1997
  • Status: Active Grant
First Claim
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1. Chemical-parameter measuring catheter, in particular for insertion into biological tissue, fluids or the like, comprising a feed duct running longitudinally through the catheter to its outer end and used to feed a liquid, a return duct running the through the catheter to return the liquid, and a partly permeable hose-like membrane at the end of the catheter and enclosing the flow space between the end of the feed duct and the return duct, characterized in that the feed duct (26) substantially coaxially encloses the return duct (4) or vice-versa, the hose-like membrane (16) forms at least in the region of the catheter end an inner wall (10) of the radially external return duct or of the radially external feed duct (26), the feed duct (26) and the return duct (4) communicate with each other at the catheter end by at least one radial aperture (24), and spacers are used which brace the innerwall (10) of the radially external tubular part (12) and/or the hose-like membrane (16) against the external wall (6) of the inner tubular part (2).

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