A system is provided for sensing blood glucose data of a patient. The
system includes a sensor, user interface, and an optional auxiliary
device. If the connection between the sensor and user interface is by a
wire, the sensor remains powered when the wire is disconnected. The
communication between the sensor and the user interface may be wireless.
The auxiliary device can be a patient monitor or other display or signal
device, which displays information about the blood glucose data collected
by the sensor. The sensor is connected to sensor electronics, which
include a sensor power supply, a voltage regulator, and optionally a
memory and processor.