Electrochemical test strip for reducing the effect of direct and mediated interference current

• US 20050139469A1
• Filed: 10/29/2004
• Published: 06/30/2005
• Est. Priority Date: 10/31/2003
• Status: Abandoned Application

• Current Assignee: LifeScan Scotland Limited (Johnson & Johnson)
• Original Assignee: LifeScan Scotland Limited (Johnson & Johnson)
• Inventors: Whyte, Lysney, Marshall, Robert, Baskeyfield, Damian Edward Haydon, Leiper, Elaine, Davies, Oliver William Hardwicke
• Application Number:
  US10/977,316
• Publication Number:
  US 20050139469A1
• Time in Patent Office: Days
• US Class Current: 204/403.10
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1486 using enzyme electrodes, e.g. with immobilised oxidase
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150282 for piercing elements, e.g. blade, lancet, canula, needle
• CPC Class Codes: A61B 5/150358 Strips for collecting blood, e.g. absorbent optical reagent test strips G01N21/8483; chemical reagent test strips G01N33/4875, G01N33/52
• CPC Class Codes: A61B 5/150435 Specific design of proximal end
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: C12Q 1/001 Enzyme electrodes
• CPC Class Codes: C12Q 1/006 for glucose
• CPC Class Codes: G01N 27/3274 Corrective measures, e.g. error detection, compensation for temperature or hematocrit, calibration coding of calibration information G01N33/48771
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

The present invention is directed to an electrochemical sensor or electrochemical strip which includes a substrate, a first working electrode disposed on the substrate, a second working electrode disposed on the substrate, a reference electrode, an active reagent layer disposed on the first working electrode, wherein the active reagent layer completely covers the first working electrode and an inactive reagent layer disposed on the second working electrode, wherein the inactive reagent completely covers the second working electrode. The present invention is also directed to an electrochemical sensor an electrochemical sensor including a substrate, a first working electrode disposed on the substrate, a second working electrode disposed on the substrate, a reference electrode, an active reagent layer disposed on the first working electrode, wherein the active reagent layer completely covers the first working electrode, the second working electrode having an active region and an inactive region, the active reagent layer disposed on a active region of the second working electrode and an inactive reagent layer disposed on the inactive region of the second working electrode.

Claims

1. An electrochemical sensor comprising:

a substrate;

a first working electrode disposed on said substrate;

a second working electrode disposed on said substrate;

a reference electrode;

an active reagent layer disposed on said first working electrode, wherein said active reagent layer completely covers said first working electrode; and

an inactive reagent layer disposed on said second working electrode, wherein said inactive reagent completely covers said second working electrode.

2. An electrochemical sensor according to claim 1 wherein:

said first working electrode, said second working electrode and said reference electrode are positioned in a sample receiving chamber;

said sample receiving chamber having a proximal and a distal end, said distal end including a first opening which is adapted to receive bodily fluids; and

said second working electrode being positioned adjacent said first opening.

3. An electrochemical sensor according to claim 2 wherein said first working electrode and said reference electrode are positioned proximal to said second working electrode.

4. An electrochemical sensor comprising:

a substrate;

a first working electrode disposed on said substrate;

a second working electrode disposed on said substrate;

a reference electrode;

an active reagent layer disposed on said first working electrode, wherein said active reagent layer completely covers said first working electrode;

said second working electrode having an active region and an inactive region, said active reagent layer disposed on a active region of said second working electrode and an inactive reagent layer disposed on said inactive region of said second working electrode.

5. An electrochemical sensor according to claim 4 wherein:

said first working electrode, said second working electrode and said reference electrode are positioned in a sample receiving chamber;

said sample receiving chamber having a proximal and a distal end, said distal end including a first opening which is adapted to receive bodily fluids; and

said inactive region of said second working electrode being positioned adjacent said first opening.

6. An electrochemical sensor according to claim 5 wherein said active region of said second working electrode and said first working electrode are positioned proximal to said inactive region of said second working electrode.