Assessment of an Automatic Closed-loop Insulin Delivery System

Inclusion Criteria:

   1. Clinical diagnosis of type 1 diabetes

      - The diagnosis of type 1 diabetes is based on the investigator's judgment

      - C peptide levels and antibody determinations are not required

   2. Daily insulin therapy for ≥ 12 months

   3. Insulin pump therapy for ≥ 3 months

   4. Age 14.0 - 40.0 years

   5. Subject comprehends written English

   6. Female subjects who are sexually active must be on acceptable method of contraception
   e.g. oral contraceptive pill, diaphragm, IUD

   7. Female subjects past menarche must have a negative urine pregnancy test

   8. Informed consent form is signed by the subject and/or parent and assent assigned by
   the subject if under 18 years of age

   9. For subjects under 18 years, both the subject and parent/guardian understand the study
   protocol and agree to comply with it. Both parents must sign if possible.

Exclusion Criteria:

   1. Subject has a medical disorder that in the judgment of the investigator will affect
   the wearing of the devices or the completion of any aspect of the protocol

   2. Diabetic ketoacidosis in the past month

   3. Hypoglycemic seizure or loss of consciousness or an event requiring glucagon or IV
   glucose in the past 3 months

   4. Subject has a respiratory condition such as asthma, treated with systemic or inhaled
   corticosteroids in the previous 6 months or cystic fibrosis

   5. Subject has a history of any cardiac or vascular disorder such as myocardial
   infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting,
   transient ischemic attack, cerebrovascular accident, angina, congestive heart failure,
   arrhythmia or thromboembolic disease

   6. Subject has a history of liver or kidney disease (other than microalbuminuria)

   7. Subject has active Graves' disease

   8. Subjects with inadequately treated thyroid disease or celiac disease

   9. Subject has a neurologic disorder that in the judgment of the investigator will affect
   completion of the protocol

10. Subject has a history of diagnosed medical eating disorder

11. Subject has a history of known illicit drug abuse

12. Subject has a history of known prescription drug abuse

13. Subject has a history of current alcohol abuse

14. Subject has a history of visual impairment which would not allow subject to
   participate

15. Subject has an active skin condition that would affect sensor placement

16. Subject has adhesive allergies

17. Subjects requiring an intermediate or long-acting insulin (such as NPH, detemir or
   glargine)

18. Subjects requiring other anti-diabetic medications other than insulin (oral or
   injectable)

19. Current use of oral/inhaled glucocorticoids or other medications, which in the
   judgment of the investigator would be a contraindication to participation in the study

20. Subject is currently on beta blocker medication

21. Subject is currently participating in another investigational study (drug or device)

22. Subject is deemed by the investigator to be unwilling or unable to follow the protocol

23. Presence of a febrile illness within 24 hours of enrollment