- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01712594
Safety and Effectiveness Study of a Closed Loop System Maintaining Patients' Glucose Levels During an Overnight Period
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.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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-
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London, United Kingdom, SE5 9PJ
- King's College London
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- A clinical diagnosis of Type 1 diabetes as determined by the Investigator for a minimum of 36 months prior to enrollment
- Weight is between 50 and 120 kg
- Subject has used a Medtronic insulin pump for at least the previous 6 months
- Subject has an glycated hemoglobin (A1C) value ≤ 9.0% demonstrated at the time of enrollment
- Subject uses a rapid-acting analogue insulin in his/her pump
Exclusion Criteria:
- Female subject who has a positive serum pregnancy screening test, or who plans to become pregnant during the course of the study
- Subject has a history of hypoglycemic seizure or hypoglycemic coma within the past 12 months
- Subject has an exclusionary cardiac disorder
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Non-Randomized
- Interventional Model: Crossover Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Active Comparator: Closed Loop Procedure AB
Closed loop procedure with normal calibration first followed by closed loop procedure B with calibration error induced.
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The procedure A is the device running under normal conditions, procedure B will incorporate an induced calibration error.
Other Names:
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Active Comparator: Closed loop Procedure BA
Closed loop procedure with an induced calibration error first followed by closed loop procedure with normal calibration.
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The procedure A is the device running under normal conditions, procedure B will incorporate an induced calibration error.
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Amount of time spent in the target range defined as 3.8-8.8 mmol/l (70 to 160 mg/dL) YSI glucose during in-clinic overnight visits
Time Frame: Two in-patient nights
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Subjects will arrive at the research facility between 17:00 and 18:00.
Plasma glucose will be measured and they will have their evening meal of no more than 80 g of carbohydrate.
They will bolus for this meal using their usual Bolus Wizard (Medtronic) settings.
After the meal, an IV catheter will be inserted for the collection of venous blood samples.
The Mobile Control System will be connected and closed-loop control will be started approximately 4 hours after dinner.
The subject will remain under closed-loop control overnight (approximately 11 p.m.-6 a.m.).
During one of the Closed Loop nights the system will be challenged by a calibration error of 30%.
At approximately 7 am (before breakfast), the Mobile Control System will be turned off and the patient will be provided with a breakfast (approximately 40-70 gm of carbohydrate) and will take a bolus according to the Bolus Wizard.
The patient will return to their usual pump treatment with the MiniMed Paradigm Veo System.
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Two in-patient nights
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Glucose Area under the curve (AUC) below 3.8 mmol/l (70 mg/dL ) YSI glucose obtained during in-clinic overnight visits
Time Frame: Two overnight closed loop sessions
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Blood glucose samples will be obtained from the line approximately every 30 minutes, or every 5-15 minutes at treating physician's discretion, if either the sensor or a previous glucose reading is < 81mg/dL or > 360mg/dL (< 3.5 mmol/l or > 20 mmol/l).
Plasma samples will be analyzed using a YSI 2300 Glucose and Lactate Analyzer between 18:00 and 6:00.
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Two overnight closed loop sessions
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Glucose AUC above 8.8mmol/l (160 mg/dL) YSI glucose obtained during in-clinic overnight visits
Time Frame: Two overnight closed loop sessions
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Blood glucose samples will be obtained from the line approximately every 30 minutes, or every 5-15 minutes at treating physician's discretion, if either the sensor or a previous glucose reading is < 81mg/dL or > 360mg/dL (< 3.5 mmol/l or > 20 mmol/l).
Plasma samples will be analyzed using a YSI 2300 Glucose and Lactate Analyzer (YSI, Inc., OH, USA) between 18:00 and 6:00.
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Two overnight closed loop sessions
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Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
All descriptive endpoints stratified by the accuracy of the sensor based on mean absolute relative difference (MARD) overnight
Time Frame: Two overnight closed loop sessions
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A meter blood glucose (BG) value is entered into the Android and a sensor and calibration error check are performed.
If the routine determines that the sensor and BG are valid values, the Closed Loop will start.
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Two overnight closed loop sessions
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Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- CEP223
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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