Patent ID: 11969245
Assignee: ROCHE DIABETES CARE, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. Analyte measuring patch for invasively measuring a concentration of an analyte, the analyte measuring patch including:
a sensor for transcutaneous placement in a patient's tissue, the sensor including a working electrode, a counter electrode and a reference electrode;
a pad for placement on the patient's skin, wherein the sensor projects from an adhesive surface of the pad
an electronics unit, wherein the electronics unit includes a microcontroller and a current measurement unit;
wherein the microcontroller includes a digital-to-analogue converter (DAC) with a control output;
wherein the microcontroller includes a first analogue input and a second analogue input;
wherein the control output of the DAC is operatively coupled with a control electrode through a direct galvanic coupling, the direct galvanic coupling having a flow path without electronic components;
wherein the first analogue input is operatively coupled with a measurement electrode via the current measurement unit;
wherein the control electrode is one of the working electrode or the counter electrode, and the measurement electrode is the other of the working electrode or the counter electrode;
wherein the second analogue input is operatively coupled with the reference electrode;
wherein the microcontroller is configured to control, by providing a control voltage to the control output, a potential difference between the working electrode and the counter electrode to equal a pre-defined polarization voltage.