Patent ID: 9377429
Filing Date: 2016-06-28
CPC Classification: G01N

Claim Text:
1. A calibration system, comprising: an ion-selective electrode, electrically coupled to a reference electrode and operatively coupled to a processor and a display, comprising a sodium ion-sensitive part that selectively reacts with sodium ions, and a potassium ion-sensitive part that selectively reacts with potassium ions, wherein the sodium ion-sensitive part is a liquid membrane type ion-sensitive membrane wherein a sodium ionophore is supported by a base material and the potassium ion-sensitive part is a liquid membrane type ion-sensitive membrane wherein a potassium ionophore is supported by a base material; a urine sample applied to the liquid membranes of the ion-selective electrode, a calibration liquid, including sodium and potassium ions, applied to the liquid membranes of the ion-selective electrode before the urine sample is applied to the liquid membranes of the ion-selective electrode, and an electrolytic ionic strength modifier mixed into the calibration liquid before the urine sample is applied to the liquid membranes of the ion-selective electrode, until the calibration liquid has an ionic strength that is substantially equal to an ionic strength of another urine sample; wherein the processor, operatively coupled to the ion-selective electrode and the display, is configured to detect electrical signals from the ion-selective electrode and calculate a ratio between a sodium ion concentration and a potassium ion concentration in the urine sample based on the electrical signals, wherein the display, operatively coupled to the processor, is configured to display the ratio between the sodium ion concentration and the potassium ion concentration in the urine sample;