An Inpatient Evaluation of Six-Day Subcutaneous Glucose Sensor Performance (6-DayFU)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00865345
Recruitment Status : Completed
First Posted : March 19, 2009
Results First Posted : August 27, 2012
Last Update Posted : November 6, 2012
Information provided by (Responsible Party):
Medtronic Diabetes

Brief Summary:
The purpose of this study is to assess the performance of the subcutaneous glucose sensor over an extended sensor life. The sensor is currently approved for 3 days of use and this study will examine sensor safety and accuracy when used for six days. This study will also test sensor safety and accuracy when inserted in an alternate body location (buttock area in addition to abdomen area). The study hypothesis is that the sensor performance will not greatly diminish when used for six days, or in an alternate insertion area.

Condition or disease Intervention/treatment Phase
Diabetes Device: MMT-7003 subcutaneous glucose sensor Not Applicable

Detailed Description:

The Medtronic MiniMed Subcutaneous Glucose Sensor was originally approved by the FDA for commercialization as part of the Continuous Glucose Monitoring System (CGMS) on June 15, 1999 (PMA 980022). The Sensor is composed of a microelectrode with a thin coating of glucose oxidase beneath several layers of biocompatible membrane. This same sensor is used as part of the Guardian REAL-Time System, the latest advance in continuous glucose monitoring, which is based on the CGMS. Similar to the CGMS, the Guardian REAL-Time System has been developed for use in conjunction with a standard home blood glucose meter. The Guardian REAL-Time received regulatory approval from the FDA in 2006.

As currently used, the Subcutaneous Glucose Sensor is labeled for a maximum use duration of 72 hours, using only the abdomen area as an insertion site. Recent studies have shown that the useful sensor life could extend beyond three days, and it is reasonable to expect a significant percentage of sensors to last six days. It is the goal of this study to confirm sensor performance accuracy data from one of these recent studies. The sensor is also commonly worn in body areas other than the abdomen (such as the buttock). This study will also demonstrate sensor accuracy when used in an alternate site.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 63 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: An Inpatient Evaluation of Six-Day Subcutaneous Glucose Sensor Performance
Study Start Date : March 2009
Actual Primary Completion Date : January 2010
Actual Study Completion Date : January 2010

Resource links provided by the National Library of Medicine

Drug Information available for: Dextrose

Intervention Details:
  • Device: MMT-7003 subcutaneous glucose sensor
    All subjects will use the glucose sensor, randomized to participate in a 12-hour frequent (15-minute) blood glucose sampling period on one of six days of sensor wear. Blood samples will be analyzed using a laboratory standard (YSI) for comparison to the glucose sensor to evaluate accuracy.
    Other Names:
    • Glucose sensor
    • Blood sugar sensor
    • glucose monitor
    • blood sugar monitor
    • MiniMed sensor

Primary Outcome Measures :
  1. Glucose Sensor Accuracy When Compared to Laboratory Standard (YSI-Yellow Springs Instruments) [ Time Frame: Days one through six of sensor use ]
    The primary accuracy parameter (primary effectiveness endpoint) was the comparative readings of paired sensor and YSI glucose readings, measured on days 1 through 6. Accuracy is defined as within 20% agreement between YSI and paired sensor (within 20 mg/dL if YSI <80 mg/dL). Accuracy ranges from 0 - 100, with higher number suggests better accuracy.

Secondary Outcome Measures :
  1. Device Related Moderate or Device Related Severe Adverse Events [ Time Frame: days one through six of sensor wear ]
    Device related moderate adverse event: low level of inconvenience or concern to the subject and may interfere with daily activities but is usually improved by simple therapeutic remedy Device related severe adverse event: interrupts a subject's daily activity and typically requires intervening treatment. Note: device related determination is made by the site that there is a reasonable possibility that the adverse event may have been caused by the device.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Males and females aged 18 through 75 inclusive
  • Type 1 Diabetes Mellitus treated using either CSII (continuous subcutaneous insulin infusion) or MDI (multiple daily injections) for a minimum of 3 months
  • Willingness to perform required study and data collection procedures and adhere to operating requirements of the Guardian REAL-Time and CGMS iPro Systems
  • Willingness to perform at least 4 capillary blood glucose tests per day while wearing the Guardian REAL-Time and iPro Systems
  • Willing to participate in a 12 hour frequent blood sampling session during the study
  • Subject agrees to comply with the study protocol requirements
  • Informed Consent, HIPAA Authorization, and California Experimental Subject Bill of Rights (if applicable) signed by the subject
  • The Subject is willing to wear both the Guardian REAL-Time and CGMS iPro Systems for 6 days (~144 hours).

Exclusion Criteria:

  • The Subject has a history of tape allergies that have not been resolved
  • The Subject has any skin abnormality (e.g. psoriasis, rash, staphylococcus infection) that has not been resolved and would inhibit them from wearing the sensors
  • Any additional condition(s) that in the Investigator's opinion would warrant exclusion from the study or prevent the Subject from completing the study
  • Subject is currently participating in an investigational study (drug or device)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00865345

United States, California
AMCR Institute
Escondido, California, United States, 92026
Sansum Diabetes Research Institute
Santa Barbara, California, United States, 93105
United States, Washington
Rainier Clinical Research Center
Renton, Washington, United States, 98057
Sponsors and Collaborators
Medtronic Diabetes
Study Director: John Mastrototaro, PHD Medtronic Diabetes

Responsible Party: Medtronic Diabetes Identifier: NCT00865345     History of Changes
Other Study ID Numbers: CEP 218
First Posted: March 19, 2009    Key Record Dates
Results First Posted: August 27, 2012
Last Update Posted: November 6, 2012
Last Verified: November 2012

Keywords provided by Medtronic Diabetes:
blood sugar