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US 4,600,495 AGranted
Flow through ion selective electrode
AssigneeMedtronic, Inc.
InventorEric J. Fogt
Life of this patent
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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.
Claims2
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.
3 more elements
Dependencies are inferred from the claim text.