Heterocyclic nitrogen containing polymer coated analyte monitoring device and methods of use

• US 9,494,545 B2
• Filed: 07/22/2015
• Issued: 11/15/2016
• Est. Priority Date: 01/31/2007
• Status: Active Grant

• Current Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Abbott Diabetes Care Incorporated (Abbott Laboratories Incorporated)
• Inventors: Feldman, Benjamin J., Ouyang, Tianmei, Cho, Hyun
• Primary Examiner(s): Dieterle, Jennifer
• Application Number:
  US14/806,405
• Publication Number:
  US 20150323487A1
• Time in Patent Office: 482 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14865 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/6849 in combination with a needle set
• CPC Class Codes: A61K 38/28 Insulins
• CPC Class Codes: C12Q 1/001 Enzyme electrodes
• CPC Class Codes: C12Q 1/006 for glucose
• CPC Class Codes: G01N 27/3271 Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood amperometry per se G01N27/49; aspects concerning the enzyme reagent C12Q1/001
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52
• CPC Class Codes: G01N 27/3335 the membrane containing at least one organic component G01N27/3271 takes precedence; aspects concerning the enzyme reagent in enzyme electrodes C12Q1/001

Abstract

The present invention is directed to membranes composed of heterocyclic nitrogen groups, such as vinylpyridine and to electrochemical sensors equipped with such membranes. The membranes are useful in limiting the diffusion of an analyte to a working electrode in an electrochemical sensor so that the sensor does not saturate and/or remains linearly responsive over a large range of analyte concentrations. Electrochemical sensors equipped with membranes described herein demonstrate considerable sensitivity and stability, and a large signal-to-noise ratio, in a variety of conditions.

Claims

1. A membrane structure, comprising:

an enzyme layer comprising an analyte-responsive enzyme; and

a polymer layer disposed over the enzyme layer, wherein the polymer layer comprises a crosslinker and a polymer having the formula;

2. The membrane structure of claim 1, wherein the enzyme layer comprises a glucose-responsive enzyme.

3. The membrane structure of claim 1, wherein the enzyme layer further comprises a redox mediator.

4. The membrane structure of claim 3, wherein the redox mediator comprises a complex selected from the group consisting of a ruthenium-containing complex and an osmium-containing complex.

5. The membrane structure of claim 3, wherein the redox mediator is non-leachable.

6. The membrane structure of claim 1, wherein the enzyme layer further comprises a polymer.

7. The membrane structure of claim 1, wherein the crosslinker comprises a poly(ethylene glycol).

8. The membrane structure of claim 7, wherein the poly(ethylene glycol) is a poly(ethylene glycol) diglycidyl ether.

9. The membrane structure of claim 1, wherein the polymer layer limits flux of glucose or lactate thereacross.

10. The membrane structure of claim 1, wherein the polymer layer limits flux of glucose or lactose thereacross in vivo.

11. The membrane structure of claim 6, wherein the analyte responsive enzyme is covalently bound to the polymer.

12. The membrane structure of claim 6, wherein the redox mediator is covalently bound to the polymer.

13. The membrane structure of claim 6, wherein the analyte responsive enzyme is crosslinked to the polymer.

14. The membrane structure of claim 6, wherein the redox mediator is covalently crosslinked to the polymer.

15. The membrane structure of claim 6, wherein the polymer layer is covalently bound to the enzyme layer.