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US 4,200,110 AGranted
Fiber optic pH probe
AssigneeUnited States of America
InventorsJohn I. Peterson, Seth R. Goldstein
Life of this patent
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Abstract
A fiber optic pH probe suitable to be implanted in tissue for physiological studies is disclosed. The probe includes an ion permeable membrane envelope which encloses the ends of a pair of optical fibers. A pH sensitive dye indicator composition is present within the envelope. The probe operates on the concept of optically detecting the change in color of a pH sensitive dye.
Claims8
A fiber optic pH probe suitable to be implanted in tissue for physiological studies, comprising:
- an ion permeable membrane in the form of a hollow, elongated cylinder having a distal end and a proximal end, said membrane being sealed at the distal end thereof;
- a pair of optical fibers having distal and proximal ends located substantially parallel to each other and adjacent to each other at their distal ends, said fiber distal ends being located within the proximal end of said hollow membrane;
- pH sensitive color-changing dye-containing solid material located within said hollow membrane, said ion permeable membrane having pores of a size large enough to allow passage of hydrogen ions while being sufficiently small so as to preclude passage of the dye-containing material.
Dependencies are inferred from the claim text.