Type 1 Diabetes Clinical Trial
Official title:
Feasibility and Safety of a Closed Loop Insulin Delivery System (Aka AAGC) With an Artificially Induced Calibration Error During the Overnight Period
Currently, patients diagnosed with type 1 diabetes rely on either finger stick or sensor
glucose readings when making their insulin dosage decisions. Designing a computerized system
that mimics the way insulin is produced naturally in a person who does not have type 1
diabetes holds many challenges; all of which cannot be addressed in just one study. The
purpose of the Medtronic Overnight Closed Loop study is to assess the performance of a
system designed to automatically infuse the correct insulin dose during the hours that the
patient is sleeping.
The system consists of an insulin pump that provides insulin to the patient through an
infusion set. A sensor inserted just under the patient's skin measures glucose levels and a
transmitter sends this information to the pump. To enable the sensor to register the glucose
information correctly, it must be set (calibrated) by a finger stick blood glucose 3-4 times
a day. In the commercially released system, the physician would recommend the continuous
background (basal) insulin rates and the patient would be required to make decisions
regarding extra insulin (bolus) for meals or as a response to high glucose levels.
In the Closed Loop System, a mobile control system is added to these devices. This consists
of an Android phone, a closed loop algorithm and a translator. This system is designed to
translate the sensor information and direct the pump to provide the required dosage of
insulin automatically without requiring input from the patient.
Reliable calibration has proved challenging, and so it is important that the system function
safely, even when calibration is inaccurate. In this study, a calibration error will be
introduced under very controlled circumstances. This testing will identify if the system can
maintain acceptable overnight glucose levels, regardless of whether or not calibration is
ideal.
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