Method and a system for the determination of pH and other fluid

Details Method and a system for the determination of pH and other fluid Method and a system for the determination of pH and other fluid

1996-11-13

1998-12-15

Bahr, Jennifer

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600353, 600355, 600361, 204403, A61B 500, G01N 2730

Patent

active

058489657

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a method for measuring by means of at least one electrode, such as an ambulatory measuring, the pH-value in the gastrointestinal tract.
The invention also relates to a system to perform such a method.
Units for the ambulatory registration for medical purposes are already known. Such a unit is known as Synectics MicroDigitrapper for the measuring of the pH-value, the PO.sub.2 content and further such parameters. Several units also exist for measuring only the pH-value in different regions of the gastrointestinal tract. Such a unit is Synectics ED Digitrapper.TM. and Synectics ED Digitrapper MkII.TM.. The sensor for the pH-value usually being applied are based on glass electrodes from Ingold, Switzerland and electrodes with an antimony crystal from Synectics according to USEA.E-backward.4,119,498. Said publication describes an electrode for measuring the pH-value, and the PO.sub.2 - and PCO.sub.2 -content in fluids. The known methods for measuring the pH-value, however, are presenting essential measuring errors in certain measuring situations, e.g. in respect to measurements in the gastrointestinal tract.


SUMMARY OF THE INVENTION

The present invention provides the possibility to essentially improve the measuring accuracy in determinating e.g. the pH-value by means of monocrystal metallic electrodes.
The invention thus relates to a method according to the preambles of the attached claim 1. The method is especially characterized in what is stated in the characterizing part of said claim.
Moreover, the invention relates to a system according to the preambles of the attached claim 9. The system is especially characterized in what is stated in the characterizing part of said last mentioned claim.
The invention is described herein below with reference to execution examples and to the attached drawings, in which


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows schematically an axial section of a rodlike monocrystal electrode;
FIG. 2 shows schematically an arrangement of electrodes with reference bag and a reference electrode;
FIG. 3 shows schematically the ambulatory measuring according to the invention of e.g. the pH-value in the gastrointestinal tract;
FIG. 4 shows schematically a first embodiment of a system according to the invention with two monocrystal electrodes;
FIG. 5 shows schematically a second embodiment of a system according to the invention with two variables are determined with one single monocrystal electrode and two different circuit designs; and
FIG. 6 shows schematically a monocrystal measuring electrode arranged within a potentiostat with a counter electrode.


DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIG. 1 a metal monocrystal electrode is designated 1 generally according to the previously mentioned U.S. patent, the metal preferably being antimony, a crystal 2 of the metal being arranged to be exposed at the end 3 of the electrode and the plane crystal surface 4 adapted to be exposed to a fluid coinciding with a certain crystallographic constellation of the crystal. By means of a conductor 5 the crystal is coupled to an electric circuit. Between a reference electrode 6, FIG. 2, and the measuring electrode a potential difference is created under certain conditions and the electrode can be used to measure the pH-value, and the PO.sub.2 - and PCO.sub.2 -content. According to one embodiment the determination of the pH-value is to be perform by means of the measuring electrode 1. According to a special embodiment, FIGS. 3 and 4, the electrode is adapted and provided to be lowered into the gastrointestinal tract 8 of a patient 9, e.g. by means of a catheter 7, for an ambulatory and continuous determination of the pH-value in the gastrointestinal tract, a portable unit 10 being provided for the registeration of certain variables.
Measuring values related to the pH-value are meant to be corrected for the oxygen influence in the fluid within the actual measuring region, the oxygen content there being expressed as the partial pressure r

REFERENCES:
patent: 3923626 (1975-12-01), Niedrach et al.
patent: 4119498 (1978-10-01), Edwall et al.
patent: 4409980 (1983-10-01), Yano et al.
patent: 4816131 (1989-03-01), Bomsztyk
patent: 4893625 (1990-01-01), Schuhmann
patent: 5126937 (1992-06-01), Yamaguchi et al.
patent: 5158083 (1992-10-01), Sacristan et al.

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