The trial will investigate the accuracy and performance of a new sensor for continuous glucose monitoring (CGM), the (new generation) Enlite, CE-marked in 2013, in conjunction with the new Medtronic 640G system components.

To evaluate the accuracy and performance of the new generation Enlite sensor. This is a postmarket, interventional, open-label, non-randomized, single center clinical research trial.

The trial will adopt a prospective single-sample design using the Yellow Spring Instruments (YSI) plasma glucose reference sampling procedure in the clinic and self-monitoring of blood glucose (SMBG) plasma glucose reference sampling procedure at home.

The trial will investigate the accuracy and performance (i.e. the life-time) of a new sensor for CGM, the (new generation) Enlite glucose sensor, CE-marked in 2013, in conjunction with the new Medtronic 640G system components. Accuracy and life-time of the sensor are important parameters contributing to the safety of patients and patient acceptance of this still fairly new technology.

The current trial investigates the accuracy of the new sensor in conjunction with the new 640G system components both in the clinic and at home. This enables us to assess the sensor accuracy in a well-controlled environment using a highly accurate laboratory glucose analyzer as reference as well as sensor accuracy during real-life conditions using a blood glucose meter as reference analyzer.

The data gathered in this trial will help to understand the effect of technological advancements made and can guide future development of glucose sensor for continuous glucose monitoring.

Inclusion Criteria:

• Subject has signed the informed consent form prior to screening
• Age 18-74 years (both inclusive)
• Subject has been diagnosed with T1DM
• Subject is current insulin pump user for at least 3 months
• HbA1c 9.5%
• With the exception of T1DM, the subject is considered generally healthy upon completion of medical history, physical examination, vital signs, ECG and biochemical investigations as judged by the Investigator

Exclusion Criteria:

• Female of childbearing potential who is pregnant, breast-feeding or intend to become pregnant or are not using adequate contraceptive methods (adequate contraceptive measures include sterilization, hormonal intrauterine devices, oral contraceptives, sexual abstinence, vasectomized partner)
• Subject has any condition that, in the opinion of the Investigator or qualified Investigational Centre staff, may preclude him/her from participating in the study and completing study related procedures.
• Subject has impaired vision or hearing problems that could compromise the handling of the device as determined by Investigator or qualified Investigational Centre staff
• 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, rash, Staphylococcus infection)
• Subject has travel plans which would make it difficult for the subject to attend on-site study visits as scheduled
• 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 30 days
• Subject known to be positive for Hepatitis B surface antigen (HBsAg) or Hepatitis C antibodies (or diagnosed with active hepatitis according to local practice).
• Positive result to the screening test for HIV-1 antibodies, HIV-2 antibodies or HIV-1 antigen according to locally used diagnostic testing
• Significant history of alcoholism or drug/chemical abuse as per investigator's judgment, current regular alcohol consumption of more than 1 unit per day for women and more than 2 units per day for men [1 unit of alcohol equals 1 beer (330 mL), 1 glass of wine (120 mL), or 1 glass of spirits (40 mL)], or a positive result in the urine drug/alcohol screen at the screening visit