Glucose sensor based on open circuit potential (OCP) signal

A method for determining a glucose level of a patient, the method comprising:

• determining, with one or more processors, a sensor signal based on current flowing between a first working electrode and a counter electrode;
• causing a second working electrode to transition to an open circuit potential (OCP) measurement mode by causing a resistance between the second working electrode and a reference electrode to be greater than a resistance between the first working electrode and the counter electrode and to be greater than a threshold value that enables measurement of an OCP signal, by either disconnecting the counter electrode while the first working electrode is in a first mode for measuring the sensor signal indicative of the glucose level of the patient, or by switching a resistor in to a path between the first working electrode and the second working electrode while the first working electrode is in the first mode for measuring the sensor signal indicative of the glucose level of the patient;
• determining, with one or more processors, the OCP signal based on a voltage across a second working electrode and a reference electrode;
• determining, with the one or more processors, the glucose level of the patient based on the sensor signal and the OCP signal by correcting the sensor signal using a multiplication factor that compensates for a change in oxygen level of the patient indicated by the OCP signal;
• and
• causing, with the one or more processors, insulin to be delivered to the patient based on the glucose level.

A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, configure one or more processors to:

• determine a sensor signal based on current flowing between a first working electrode and a counter electrode;
• cause a second working electrode to transition to an open circuit potential (OCP) measurement mode by causing a resistance between the second working electrode and a reference electrode to be greater than a resistance between the first working electrode and the counter electrode and to be greater than a threshold value that enables measurement of an OCP signal, by either disconnecting the counter electrode while the first working electrode is in a first mode for measuring the sensor signal indicative of a glucose level of a patient, or by switching a resistor in to a path between the first working electrode and the second working electrode while the first working electrode is in the first mode for measuring the sensor signal indicative of the glucose level of the patient;
• determine the OCP signal based on a voltage across a second working electrode and a reference electrode, wherein the reference electrode is electrically coupled to the counter electrode;
• determine the glucose level of the patient based on the sensor signal and the OCP signal by correcting the sensor signal using a multiplication factor that compensates for a change in oxygen level of a patient indicated by the OCP signal;
• and
• cause insulin to be delivered to the patient based on the glucose level.