US 4,834,101 A · Catheter-type electrochemical sensors

Abstract

A dual lumen CO.sub.2 catheter is formed of medical grade dual lumen silicone rubber tubing which has been impregnated with tridodecyl amine. The silicone tubing is gas permeable, and an external reference electrode is used to monitor the potential across the impregnated outer wall of the dual lumen tubing as a function of pH. The analyte to be monitored is selected from the group consisting of CO.sub.2, NH.sub.3, SO.sub.2, NO.sub.2, H.sub.2 S, and HCN, the internal reference and electrolyte solutions contained in the lumens being selected in response to the particular analyte desired to be monitored. In a CO.sub.2 embodiment, the reference lumen is filled with a buffered internal reference solution, and the response lumen is filled with a bicarbonate filling solution. Reference wires formed of Ag/AgCl in respective ones of the lumens forms the internal electrodes.

Claims9

Dependent claims

An arrangement for monitoring concentration of an analyte selected from the group consisting of CO.sub.2, NH.sub.3, SO.sub.2, NO.sub.2, H.sub.2 S, and HCN, the arrangement comprising:

elongated body means having dual lumens separated from one another by an integrally formed interlumen wall, said elongated body means being formed of a gas-permeable polymeric material impregnated with a pH sensitive material over at least a portion thereof for forming a pH responsive membrane, said elongated body means having a first one of said dual lumens therein accommodating an electrolyte solution responsive to a selected one of the analytes, a second one of said dual lumens accommodating a reference solution, and an ion sensitive membrane arranged as said integrally formed interlumen wall between said first and second ones of said dual lumens;
and
first and second sensor electrode means arranged in respective ones of said first and second ones of said dual lumens of said elongated body means for communicating electrically with respective ones of said electrolyte solution and said reference solution for detecting an electric potential.

Dependencies are inferred from the claim text.

Catheter-type electrochemical sensors

Life of this patent

Catheter-type electrochemical sensors

Life of this patent

Abstract

Claims9