MiniMed™ 670G System China Study for Type I Diabetic

Not Applicable

Completed

Conditions: Diabetes Mellitus, Type 1

Interventions: Device: MiniMed™ 670G system

Registration Number: NCT04663295

Lead Sponsor: Medtronic Diabetes

Brief Summary: The purpose of this study is to obtain clinical data in Chinese patients to support product registration of the MiniMed™ 670G system with the National Medical Product Administration (NMPA) in China. The results from the study will be submitted to the NMPA for product registration.

Detailed Description: This study is a multi-center, single arm study in insulin-requiring subjects with type 1 diabetes who are 14 years of age and older. The run-in period will be approximately up to 35 days long, followed by a study period that will be approximately up to 33 days in duration.

The study is anticipated to last no longer than 13 months from investigational center initiation to completion of all data entry and monitoring procedures. The study will target approximately 5 months to complete subject enrollment. Subjects can expect to participate for approximately 2-3 months including the run-in and study periods.

A total of up to 75 subjects (aged 14-75) will be enrolled at a minimum 2 investigational centers and up to 6 investigational centers (hospitals) in China to have at least 50 subjects who complete the study.

The MiniMed™ HCL system that was employed in this study was the MiniMed™ 670G Bluetooth version (MMT-1883). The MiniMed™ 670G system with Bluetooth™ technology is the MiniMed™ 770G system.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 74

Inclusion Criteria

Subject is age 14- 75 years at time of Screening.
Subject has a clinical diagnosis of type 1 diabetes for 2 years or more as determined via medical record or source documentation by an individual qualified to make a medical diagnosis.

Study-specific inclusion criteria
Subject is willing to perform ≥ 4 finger stick BG measurements daily.
Subject is willing to perform required sensor calibrations.
Subject is willing to wear the system continuously throughout the study.
Subject must have a minimum daily insulin requirement (Total Daily Dose) of greater than or equal to 8 units.
Subject has a Glycosylated hemoglobin (HbA1c) less than 10% (as processed by the investigational center lab or their contracted Local Lab) at time of Screening visit.
Subject has thyroid-stimulating hormone (TSH) in the normal range OR if the TSH is out of normal reference range the Free T3 is below or within the lab's reference range and Free T4 is within the normal reference range. Prior labs in the last 6 months are sufficient.
Subject has been on pump therapy for greater than 6 months prior to screening (with or without CGM experience).
Subject is willing to upload data from the study pump and meter at home.
If subject has celiac disease, it has been adequately treated as determined by the investigator.
Subject has been taking and is willing to take one of the following insulins throughout the course of the study:
- Humalog™* (insulin lispro injection)
- NovoLog™* (insulin aspart)
Subject must be able to carbohydrate count or willing to learn how to carbohydrate count for the study.

Exclusion Criteria

Subject has a history of 2 or more episodes of severe hypoglycemia, which resulted in any the following during the 6 months prior to Screening:
1. Medical assistance (i.e. Paramedics, Emergency Room (ER) or Hospitalization)
2. Coma
3. Seizures
Subject has been hospitalized or has visited the ER in the 6 months prior to Screening resulting in a primary diagnosis of uncontrolled diabetes.
Subject has had DKA in the 6 months prior to Screening.
Subject is unable to tolerate tape adhesive in the area of sensor placement.
Subject has any unresolved adverse skin condition in the area of sensor placement (e.g., psoriasis, dermatitis herpetiformis, rash, Staphylococcus infection).
Subject is a female of child-bearing potential who has a positive pregnancy test at Screening or plans to become pregnant during the course of the study.
Subject is a female who is sexually active and able to conceive should be excluded if they are not using an effective method of contraception and do not agree to continue using an effective method of contraception for the duration of the study as determined by investigator.
Subject has had any of the following cardiovascular events within 1 year of screening: myocardial infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting, transient ischemic attack, cerebrovascular accident, angina, congestive heart failure, ventricular rhythm disturbances or thromboembolic disease.
Subject is being treated for hyperthyroidism at time of Screening.
Subject has a diagnosis of adrenal insufficiency.
Subject has taken any oral, injectable, or intravenous (IV) glucocorticoids within 8 weeks from time of Screening, or plans to take any oral, injectable, or IV glucocorticoids during the course of the study.
Subject is actively participating in an investigational study (drug or device) wherein he/she has received treatment from an investigational study drug or investigational study device in the last 2 weeks. (Please note participation in an observational study is acceptable.)
Subject is currently abusing illicit drugs.
Subject is currently abusing alcohol.
Subject is using pramlintide (Symlin), DPP-4 inhibitor, liraglutide (Victoza or other GLP-1 agonists), metformin, canagliflozin (Invokana or other SGLT2 inhibitors) at time of Screening.
Subject has a history of visual impairment which would not allow subject to participate in the study and perform all study procedures safely, as determined by the investigator.
Subject has elective surgery planned that requires general anesthesia during the course of the study.
Subject has a sickle cell disease, hemoglobinopathy; or has received red blood cell transfusion or erythropoietin within 3 months prior to time of Screening
Subject plans to receive red blood cell transfusion or erythropoietin over the course of study participation.
Subject diagnosed with current eating disorder such as anorexia or bulimia
Subject has been diagnosed with chronic kidney disease that results in chronic anemia.
Subject has a hematocrit (Hct) that is below the normal reference range of lab used. Prior labs in the last 6 months are sufficient.
Subject is on dialysis.
Subject has an estimated glomerular filtration rate (eGFR) of < 30.
Subject has a pediatric BMI category of underweight (less than the 5th percentile) as defined by Centers for Disease Control (CDC) (https://www.cdc.gov/healthyweight/assessing/bmi/childrens_bmi/about_childrens_bmi.html)
Subject is a member the research staff involved with the study.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Subjects with Type 1 diabetes wearing HCL pump system	MiniMed™ 670G system	Subjects 14-75 years of age who have been diagnosed with Type 1 diabetes.

Primary Outcome Measures

Name	Time	Method
Change in Time in Target Range (% of Sensor Glucose (SG)): 70 mg/dL (3.9 mmol/L) ≤ SG ≤ 180 mg/dL (10 mmol/L)	Baseline to end of 1-month study	The overall mean change in % of time in target range from run-in period to study period will be estimated and compared by a simple superiority paired test and a significance level of 0.025 (one-sided).

Secondary Outcome Measures

Name	Time	Method
Time in Hyperglycemic Range: SG > 180 mg/dL (10 mmol/L), 250 mg/dL (13.9 mmol/L) and 350 mg/dL (19.4 mmol/L)	1-month study	Time in hyperglycemic range (SG \> 180 mg/dL (10 mmol/L), 250 mg/dL (13.9 mmol/L) and 350 mg/dL (19.4 mmol/L)) will be summarized.
Standard Deviation (SD) of SG in mg/dL	1-month study	In order to evaluate glucose variation, we calculated standard deviation. The standard deviation (SD) of SG will be summarized in the unit of mg/dL.
Coefficient of Variation (CV) of SG	1-month study	In order to evaluate glucose variation, we calculated coefficient of variation (CV) of SG. The glucose coefficient of variation (CV) will be summarized in percentage.
Time Spent in Auto Mode (HCL) Versus Time Spent in Manual Mode (Open Loop)	1-month study	Time spent in Auto Mode (HCL) and time spent in Manual Mode (open loop) will be summarized.
Change of Total Daily Dose (TDD) of Insulin From Baseline to End of Study (EOS)	Baseline to end of 1-month study	Change of Total Daily Dose (TDD) of insulin from baseline to EOS will be summarized.
Time in Specific Range Stratified by Baseline HbA1c Ranges (< 7%, 7 - < 7.5%, 7.5 - 8%, > 8%)	1-month study	Time in target range (% of SG): 70 mg/dL (3.9 mmol/L) ≤ SG ≤ 180 mg/dL (10 mmol/L) in study period Time in hypoglycemic range (% of SG): SG \< 70 mg/dL (3.9 mmol/L), 60 mg/dL (3.3 mmol/L) and 54 mg/dL (3.0 mmol/L) in study period Time in hyperglycemic range: SG \> 180 mg/dL (10 mmol/L), 250 mg/dL (13.9 mmol/L) and 350 mg/dL (19.4 mmol/L) in study period
Time in Hypoglycemic Range	1-month study	Time in hypoglycemic range (% of SG): SG \< 70 mg/dL (3.9 mmol/L), SG \< 60 mg/dL (3.3 mmol/L), SG \< 54 mg/dL (3.0 mmol/L) will be summarized.
Standard Deviation (SD) of SG in mmol/L	1-month study	In order to evaluate glucose variation, we calculated standard deviation. The standard deviation (SD) of SG will be summarized in the unit of mmol/L
Change of Weight From Baseline to EOS	Baseline to end of 1-month study	Change of weight from baseline to EOS will be summarized.

Trial Locations

Locations (4): The First Affiliated Hospital, Sun Yat-sen University
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Guangzhou, Guangdong, China
Chinese PLA General Hospital
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Beijing, Beijing, China
Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School
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Nanjing, Jiangsu, China
Shanghai General Hospital
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Shanghai, Shanghai, China