Miniaturized sensor component for measuring concentrations of substances in liquids, and method of manufacturing such a component

• US 5,468,374 A
• Filed: 11/04/1993
• Issued: 11/21/1995
• Est. Priority Date: 11/13/1991
• Status: Expired due to Term

• Current Assignee: Meinhard Knoll
• Original Assignee: Meinhard Knoll
• Inventors: Knoll, Meinhard
• Primary Examiner(s): Drodge, Joseph W.
• Application Number:
  US08/090,107
• Time in Patent Office: 747 Days
• Field of Search: 204/415, 204/418, 204/419, 204/420, 204/403, 324/459, 427/245, 427/246, 210/85, 210/321.84, 210/96.2, 210/490, 210/500.25, 210/500.27, 210/500.29, 210/506, 210/510.1, 422/82.03, 435/29, 435/32, 435/288, 156/290, 156/292
• US Class Current: 210/96.2
• 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
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing

Abstract

A miniaturized sensor component for measuring concentrations of substances in liquids comprises a support that contains cavities accommodating a membrane. The membrane is produced in situ by polymerization or by precipitation from a solution. An electric lead is either mechanically connected to or integrated into the membrane and is in contact with the membrane. The membrane support is a capillarized solid and the membrane is produced in the capillaries by impregnating the support with a liquid that subsequently either polymerizes or evaporates leaving a residue.

Claims

1. In a miniaturized sensor component for measuring concentrations of substances in liquids and comprising a support that contains cavities accommodating a membrane, whereby the membrane is produced in situ by polymerization or by precipitation from a solution, an electric lead is either mechanically connected to or integrated into the membrane and is in contact with the membrane, the improvement wherein the membrane support is a capillarized solid and the membrane is produced in the capillaries by impregnating the support with a liquid, comprising membrane forming material and active components, that subsequently either polymerizes or evaporates leaving a residue.

2. Miniaturized sensor component as in claim 1, wherein the support is made of a material selected from the group consisting of filter paper, non-filter paper, and cellulose felt.

3. Miniaturized sensor component as in claim 1, wherein the support is made of synthetic fiber.

4. Miniaturized sensor component as in claim 3, wherein said synthetic fiber is synthetic-filament felt.

5. Miniaturized sensor component as in claim 1, wherein the support is a textile or knit.

6. Miniaturized sensor component as in claim 1, wherein the support is a metal felt or textile.

7. Miniaturized sensor component as in claim 1, wherein the support is an organic or inorganic foam.

8. Miniaturized sensor component as in claim 1, wherein the capillarized support is provided with a conductive layer that functions as a contact surface.

9. Miniaturized sensor component as in claim 8, wherein said conductive layer is a layer of silver.

10. Miniaturized sensor component as in claim 1, wherein the material the capillarized solid is rendered conductive by the addition of a conductive substance.

11. Miniaturized sensor component as in claim 10, wherein said conductive substance is lamp black or powdered metal.

12. Miniaturized sensor component as in claim 1, wherein the membrane support is in the form of sheet material.

13. Miniaturized sensor component as in claim 12, wherein said sheet material is an elongate web.

14. Miniaturized sensor component as in claim 1, further comprising a continuous conductive layer (5) on at least one side of the membrane support.

15. Miniaturized sensor component as in claim 1, further comprising individual contact chips (6) or surfaces on at least one side of the membrane support.

16. Miniaturized sensor component as in claim 1, for use as part of a biological-sensor component, wherein one side of the membrane support is provided with a layer (12) of enzyme or of another biologically active material.

17. Miniaturized sensor component as in claim 1, for use with a reference electrolyte, further comprising a reference in the form of a capillarized solid with an electrolyte, one side of which is bonded to a membrane support and ion-selective material and the other side of which is bonded to a silver and silver-chloride lead.

18. Miniaturized sensor component as in claim 1, wherein the miniaturized sensor component (10) is manufactured by gridlike division of a larger section of a web of impregnated membrane support.

19. Method of manufacturing support-mounted sensor components, wherein a miniature sensor component as recited in claim 18 is obtained by slicing or stamping and secured on and is in contact with a layer (13) of metal forming a contact area, subsequent to which the contact area is sealed.

20. Method as in claim 19, wherein the metal layer (13) is coated with a layer (15) of insulation that has contact-window openings (17) and in that the contact chips (6), each with a miniature sensor component (10), in positioned in them and secured in contact.

21. Method as in claim 19, wherein the miniaturized sensor component is secured with a conductive adhesive.

22. Method of as in claim 21, wherein the conductive adhesive is a conductive silver adhesive.

23. Method of manufacturing miniaturized sensor components as in claim 1, comprising providing a membrane support having a membrane which is coated with an inert layer (7) of adhesive with a grid of interstices (7'"'"') left in it and in that a continuous film of electrically conductive material is applied such that it will contact the membrane in the membrane support in the vicinity of the interstices.

24. Method of manufacturing miniaturized sensor components as in claim 23, wherein said electrically conductive material is silver.

25. Use of a miniaturized sensor component as in claim 1 as a membrane support with an ion-selective polymer membrane in an ion-selective electrode.