Nicole M Pouliot

US Patent:

61971723, Mar 6, 2001

Filed:

Sep 28, 1998

Appl. No.:

9/162478

Inventors:

David H. Dicks - Glocester RI
Handani Winarta - Nashua NH
John Hiti - Danvers MA
Nicole Pouliot - Waltham MA
Jeffrey C. Chien - Ashland MA
Chung Chang Young - Weston MA

International Classification:

G01N 27333

US Classification:

204416

Abstract:

An electrochemical sensor with a gelled membrane for prolonging the useful life of an ion-selective electrode. The gelled membrane is a hydrophilic membrane having a specially-formulated gel layer coated on one side. The gel-coated side of the gelled membrane is in intimate contact with the ion-selective membrane and separates the ion-selective membrane from the test samples and the calibration and cleaning fluids. The gelled membrane is a semi-permeable barrier which allows passage of the species to be measured while inhibiting the passage of surfactant and proteinaceous material into the polymeric ion-selective membrane.