Single-centre, open label (unblinded). A maximum of 48 patients will be enrolled in 4 Cohorts of 10 patients and 2 potential replacements each. Diabetic patients (type 1 and 2). Duration up to 11 weeks: up to 6 weeks of screening phase (42 days); 4 weeks of treatment/measurement phase (28 days, depending on sensor functionality) and 1 week of follow up (7 days)
This study is an investigational study, which will be conducted only at one site in Germany. The investigators, the patient and the sponsor will be unblinded. The eligibility of the patient is determined in up to two steps, a screening (see inclusion criteria) and in case of women of childbearing potential a urine pregnancy test at the day of sensor insertion (independent of any re-screening). Women of childbearing potential are only enrolled after a negative outcome of the urine pregnancy test. The screening results are valid up to 42 days. Within that time the first measurement visit including the insertion of the device should be performed. If the first measurement visit is delayed a re-screening has to be performed. Should the patient not pass the re-screening, the patient is considered as a screening failure and must be excluded. The trial is structured into three phases, the screening/enrolment phase, the insertion/measurement phase and the follow-up phase. Screening/Enrolment Phase: Up to 6 weeks (42 days), 1 visit Insertion/Measurement phase: Up to 4 weeks (28 days), up to 6 in-house measurement visits Follow-up Phase: 1 week (7 days), 1 visit
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
DEVICE_FEASIBILITY
Masking
NONE
Enrollment
10
FiberSense system, a novel CGM system using interstitial fluid (ISF) glucose as an indicator of blood glucose levels by diabetic patients
Diabetes Instiut Heidelberg
Heidelberg, Germany
Short and mid term performance of the transdermal CGM sensor determined as MARD
Mean absolute relative difference (MARD) of FiberSense system to blood glucose
Time frame: 0, 3, 7, 14, 21 and 28 days
Incidence of adverse events
Assessment of adverse events and local tolerability occurred during the study
Time frame: 0, 3, 7,14, 21, 28 and 35-38 days
Stability of the blood glucose to fluorescence correlation
FiberSense fluorescence measurement signals calculated in glucose values and compared to glucose values measured with: a: SMBG device (Bayer Contour next USB), b: CGM device (Dexcom Seven plus), c: Laborat orysystem (Hitado Super GL compact)
Time frame: 0, 3, 7, 14, 21 and 28 days
Changes in blood glucose to fluorescence lag time over a period of up to 28 days
Lag time (in minutes) between FiberSense readings and corresponding laboratory blood glucose values during glucose excursions
Time frame: 0, 3, 7, 14, 21 and 28 days
Correlation between the fluorescence readings of the sensor and capillary blood glucose measurements
Calculation of MARD of FiberSense against a commercial self-monitoring blood glucose meter
Time frame: 0, 3, 7, 14, 21 and 28 days
Signal-to-noise ratio
Time frame: 0, 3, 7, 14, 21 and 28 days
Signal drift
Drift of the FiberSense fluorescent measurement signals over the wearing time
Time frame: 0, 3, 7, 14, 21 and 28 days
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User satisfaction assessed by the Likert scale
Subjective impression of the patients assessed by 5-point Likert scale (1- strongly agree to 5 - strongly disagree)
Time frame: 35-38 days