Patent ID: 6616625
Filing Date: 2003-09-09
Classification: A61B,A61M

Abstract:
Chemical-parameter measuring catheter for insertion into biological tissue, fluids or the like, the catheter comprising:a) an inner tubular part having first and second ends, said inner tubular part having a duct extending longitudinally therethrough for conveying a fluid; b) an external tubular part having first and second ends, said external tubular part surrounding said inner tubular part in a spaced relation therefrom to provide a duct for conveying fluid therebetween, said external tubular part duct extending between an inner wall of said external tubular part and an external wall of said inner tubular part; c) at least one aperture extending through said inner tubular part at one of said ends thereof to provide fluid communication between said inner tubular part duct and said external tubular part duct; d) a partly permeable hose-like membrane operatively associated with said external tubular part at least at one of said first and second ends thereof, said partly permeable hose-like membrane having an inner wall coextensive with said external tubular part inner wall; and e) a spacer, said spacer for bracing each of said permeable hose-like membrane inner wall and said external part tubular inner wall against said inner tubular part external wall and extending substantially the length of said catheter so that during measuring said external tubular part duct will be maintained open throughout.