Feasibility Evaluation of an Artificial Pancreas With Glucose Prediction Trust Index

Sansum Diabetes Research Institute

Status: Completed

Conditions: Type 1 Diabetes Mellitus

Treatments: Device: Artificial Pancreas Device

Study type: Interventional

Funder types: Other

Identifiers

NCT03092310

Pro00020556

Details and patient eligibility

About

The purpose of this pilot study is to establish that closed-loop insulin delivery with a target enchanted model predictive control (eMPC)/Health Monitoring System (HMS) algorithms with a trust index of the predicted glucose value is safe and effective, to analyze and learn to improve upon the accuracy of the predicted glucose values, and to collect efficacy data to inform a future larger study.

Full description

This is a feasibility study of an artificial pancreas (AP) system with our previously validated target eMPC and HMS algorithms, with the addition of a trust index of the predicted glucose value integrated into the portable Artificial Pancreas System (pAPS). The system will be evaluated on up to 20 subjects, with the goal of 10 subjects completing a 48-hour closed-loop session at one clinical site (William Sansum Diabetes Center). During the session subjects will bolus for all meals and snacks and perform a 45-minute walking session.

The purpose of this pilot study is to establish that closed-loop insulin delivery with a target enchanted model predictive control (eMPC)/Health Monitoring System (HMS) algorithms with a trust index of the predicted glucose value is safe and effective, to analyze and learn to improve upon the accuracy of the predicted glucose values, and to collect efficacy data to inform a future larger study.

Enrollment: 15 patients

Sex: All

Ages: 18 to 75 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age ≥ 18 and ≤ 75 years at the time of screening.
• Clinical diagnosis of type 1 diabetes for at least one year.
• Has been using an insulin pump for at least 6 months at the time of screening.
• HbA1c < 10%, as performed by point of care or central laboratory testing. A1c will be assessed at the screening visit, or if already completed within 2 months of the screening visit, the prior lab value may be used in lieu of repeating this assessment.
• Serum creatinine of < 2.0 mg/dL. Serum creatinine will be assessed at the screening visit, or if already completed within 2 months of the screening visit, the prior lab value may be used in lieu of repeating this assessment.
• Bolus for all meals and snacks that contain ≥ 5 grams of carbohydrate.
• Willing to perform at least 7 fingerstick blood glucose tests a day.
• Willing to refrain from taking acetaminophen products for the duration of the clinical trial. If acetaminophen is taken, subject is to avoid making any insulin dosing decisions based on CGM for at least 12 hours.
• Willing to abide by the study protocol and use study-provided devices, including the Omnipod, Dexcom CGM, glucometer, ketone meter and pAPS tablet.

Exclusion criteria

• Pregnancy
• One or more episodes of hypoglycemia requiring an emergency room visit or hospitalization in the past 6 months.
• One or more episodes of hyperglycemia requiring an emergency room visit or hospitalization in the past 6 months.
• Known unstable cardiac disease or untreated cardiac disease, as revealed by history or physical examination.
• Dermatological conditions that would preclude wearing a CGM sensor or Pod.
• One or more seizures in the past year.
• Screening A1c ≥ 10% or serum creatinine ≥ 2.0 mg/dL.
• Any condition that could interfere with participating in the trial, based on investigator judgment.
• Concurrent use of any non-insulin glucose-lowering agent (including GLP-1 agonists, Symlin, DPP-4 inhibitors, SGLT-2 inhibitors, biguanides, sulfonylureas and naturaceuticals), defined as using any of these medications within 30 days of the screening visit or during the study.
• Participation in another pharmaceutical or device trial at the time of enrollment or during the study.

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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15 participants in 1 patient group

Artificial Pancreas

Experimental group

Description:

The artificial pancreas device will employ its enhanced Model Predictive Control (MPC) algorithm with a target glucose level of 110 mg/dL with a trust index for MPC-predicted glucose values, weighing future glucose predictions and only acting on predictions with higher weight in the trust index. The Health Monitoring System algorithm uses the same CGM data as the MPC control algorithm but utilizes a separate algorithm for trending and predictions of future glucose values. Using a redundant and independent algorithm is an important safety feature of the overall AP device.

Treatment:

Device: Artificial Pancreas Device