Duration of Infusion Set Function: Quick-Set Teflon Catheter Versus Sure-T Steel Infusion Set Catheter

If you choose to participate, you will be assigned to start with either a Quick-Set Teflon
Catheter or a Sure-T Steel Catheter for your insulin pump infusion set. You will alternate
catheter types weekly for four weeks; ie, at the end of the study, you will have used a
Teflon catheter for two weeks, and a steel catheter for two weeks. We will ask you to wear
each catheter once it is inserted for one week, or until the infusion set fails. Infusion
set failure is defined as: 1) Blood ketones greater than 0.6 mmol/L, 2) Evidence of
infection at the infusion site (such as redness of more than 4 mm), or 3) Your blood glucose
does not decrease by at least 50 mg/dL within 1 hour of a correction bolus to treat a blood
glucose greater than 300 mg/dL.

You will be provided with an investigational Medtronic Real-Time Continuous Glucose Monitor
(CGM) Enlite Sensor/Serter to help identify, serious hyperglycemia or hypoglycemia during
the study. This sensor is not yet FDA approved, but is similar to commercially available
sensors. If the sensor detects a high or low glucose, you must obtain a fingerstick glucose
to confirm the result. All insulin dose decisions must be made using your home glucose
meter results, and should not be based on sensor results. You will be instructed on how to
identify infusion set failure. You will follow-up weekly in one of our test centers for a
total of five visits:

Visit 1: The protocol will be reviewed. A fingerstick Hemoglobin A1c value will be
obtained. Detailed instruction on use of the Medtronic Real-Time Continuous Glucose Monitor
(CGM) will take place. You will receive instruction on how to insert the insulin pump
infusion set to which you have been initially assigned. You will fill a new reservoir with
Novolog insulin, and insert the infusion set. You will be taught how to refill your pump
reservoir, in case your insulin needs to be refilled before the insertion set needs to be
changed. You will be instructed on how to recognize the signs of infusion set failure. You
will also be instructed to monitor blood sugars at home with a glucose meter, and to check
serum ketones if a blood sugar is >250 mg/dL. For this purpose, you will be provided with
an Ultra glucose meter, and a Precision Xtra ketone meter, to be used during the study.

At home you will be asked to keep a log recording measurements of redness and induration at
the infusion site when it is changed prior to the study visit.

Any blood sample collected will be destroyed once study is complete. We will not be storing
samples.

Visit 2: Seven days after the first infusion set was inserted, the infusion and sensor
insertion sites will be examined and photographed. The insulin pump, blood glucose meter,
Precision Xtra ketone meter, and the CGM will have data downloaded for review. You will
then have the other infusion set inserted; i.e. if you initially had a Sure-T Steel
Catheter, you will now have a Quick-Set Teflon catheter placed (in a new location).

Visit 3: Follows the same protocol and uses the same type of insertion set as in visit 1.

Visit 4: Follows the same protocol and uses the same type of insertion set as in visit 2.

Visit 5: Seven days after the fourth infusion set was inserted, the infusion and sensor
insertion sites will be examined and photographed. The insulin pump, blood glucose meter,
Precision Xtra ketone meter, and the CGM will have data downloaded for review. This fifth
visit will conclude your participation in the study. All study materials, including the
Continuous Glucose Monitor (CGM), will be returned.