Flow through ion selective electrode

• US 4,600,495 A
• Filed: 08/15/1985
• Issued: 07/15/1986
• Est. Priority Date: 08/03/1983
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Fogt, Eric J.
• Primary Examiner(s): Niebling, John F.
• Assistant Examiner(s): Chapman, Terryence
• Application Number:
  US06/765,757
• Time in Patent Office: 334 Days
• Field of Search: 204/414, 204/416, 204/418, 204/419, 204/417, 204/409, 128/635
• US Class Current: 204/409
• CPC Class Codes: B29D 23/00 Producing tubular articles B29D24/00 takes precedence
• CPC Class Codes: B29D 99/005 Producing membranes
• CPC Class Codes: B29K 2021/00 Use of unspecified rubbers as moulding material
• CPC Class Codes: B29K 2027/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B29K 2075/00 Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29L 2031/755 Membranes, diaphragms
• 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

An improved flow through ion sensing electrode and a method for producing it. The electrode is formed of bilumen plastic tubing using one lumen as the sample path and the other lumen as a sensing chamber. By permeating a portion of the tubing with an ion selective material, an ion selective membrane integral with the chamber wall is produced. A preferred embodiment also incorporates a reference electrode.

Claims

1. A flow through ion sensing electrode, comprising:

a plastic tube having a proximal end, a distal end, an outer wall, a first lumen, a second lumen, and an inner wall separating said first lumen from said second lumen, said second lumen having first and second ends open to the exterior of said electrode, a portion of said tube including at least part of said inner wall impregnated with an ion selective material;

first sealing means for sealing the first lumen of said tube proximal to at least part of said impregnated portion of said tube;

second sealing means for sealing the first lumen of said tube distal to at least a portion of said impregnated portion of said tube;

electrolyte gel filling the first lumen of said tube intermediate said first and second sealing means; and

first electrode inserted in the first lumen of said tube intermediate said first and second sealing means.

2. An ion sensing electrode according to claim 1 wherein said tube is impregnated with said ion selective material only distal to a first point intermediate the proximal and distal ends of said tube, and wherein the inner wall of said tube is provided with an aperture at a second point proximal to said first point, opening the first lumen of said tube to the second lumen of said tube, and further comprising:

third sealing means for sealing the first lumen of said tube intermediate said first and second points, and proximal to said first electrode; and

second electrode inserted in said first lumen intermediate said and third sealing means.