Page 127 - Glucose Monitoring Devices

128 CHAPTER 6 CGM sensor technology

fingerstick blood glucose value. Trend arrows on the home screenplay an important
role in the user’s treatment decisions. If an individual misses or miscalculates a dose,
it is recommended not to base the next dosage on the arrows but calculate the value
of glucose from the mealtime and use their insulin-to-carbohydrate ratio [26].
The Dexcom G6’s transmitter life is 3 months, and the user receives two trans-
mitters with each purchase. Similar to the Freestyle Libre, if the transmitter is
removed or replaced, the sensor is also replaced. The Dexcom G6 wirelessly com-
municates with a commercially available insulin pump to automatically adjust some
insulin doses.
Medtronic Guardian Connect CGM
The Medtronic Guardian Connect is a self-inserted transcutaneous CGM for people
14e75 years old. The sensor is inserted with the aid of a spring-loaded injector.
Similar to other transcutaneous sensors, the adhesive patch is worn for the life of
the 7-day sensor. The sensor is indicated for placement either on the abdomen or
the arm. Fingerstick blood glucose monitoring is required for making treatment
decisions, and calibration is required twice a day or as indicated by the system.
The warm-up period is 2 h for each 7-day sensor session. The Medtronic Guardian’s
transmitter life is1 year.
Similar to other CGM systems, the glucose data are wirelessly sent to a reader or
mobile app and displayed for the user. The Guardian Connect provides high, low,
rate of change, and predictive high and low alerts.
The Medtronic CGM is part of a hybrid closed-loop system that automatically
adjusts insulin delivery from select Medtronic insulin pumps.

Eversense CGM system
The Eversense CGM System is currently the only CGM system with an implantable
sensor. The sensor is inserted by a health care provider in the upper arm and is
intended to be used by people 18 and older. The adhesive patch is silicone-based
and designed to be changed daily. Fingerstick blood glucose monitoring is required
for making treatment decisions, and calibration is required twice a day. The warm-up
period is 1 day in each 90- or 180-day sensor session. The Eversense Smart Trans-
mitter warranty is one year.
The transmitter, worn over the sensor site, wirelessly powers the sensor and col-
lects the glucose data. That data are sent wirelessly to a mobile app on the user’s
phone. The Eversense CGM System provides high, low, rate of change and predic-
tive high and low alerts. The Eversense smart transmitter can be removed and
replaced without ending the sensor session, and the transmitter provides uniquely
patterned on-body vibratory alerts for high and low glucose. The area should be
able to easily apply an adhesive patch. A 5 mm incision is made to then create a
subcutaneous pocket below the skin surface where the sensor would be deployed
with the insertion tools.
Put the insertion tool into the incision at about 45-degrees and lower to 5e10
degrees to match the marks of the blunt dissector. Insert the sensor into the pocket