Feasibility study assessing the ability of an insulin pump-controlling algorithm to minimize hypoglycemia and hyperglycemia in patients with type 1 diabetes in a clinical research setting.

This study is a non-randomized, uncontrolled feasibility study that looks to enroll people with type 1 diabetes who are currently using an insulin pump. During the subject's participation, the study staff will closely monitor the study subject in a clinical research center environment for approximately 30 hours, while controller algorithm determined insulin doses are delivered by an insulin pump, and utilizing continuous glucose monitoring results.

Inclusion Criteria:

• Age 21-65 years
• type 1 diabetes mellitus for at least one year
• Currently using an insulin infusion pump for at least the past 6 months

Exclusion Criteria:

• Pregnancy
• History of Diabetic Ketoacidosis (DKA) in the past six months
• Histoey of severe hypoglycemia (Seizure, unconsciousnesss) in the past 6 months