Longevity of Multi-Slitted Catheter With Lantern Technology

This is a pilot study to obtain preliminary data to determine the time to set failure when
the Lantern infusion set is worn for up to 10 days. The study is not intended for
registration purposes or to support a 510(k) submission. The study will be conducted at one
site: Stanford University.

This study will enroll 24 subjects (as per FDA approval) to establish the maximum length of
Lantern infusion set wear when 80% of sets are still functional (excluding accidental
"pull-outs"). Each participant will place the set and wear it for 10 days or until set
failure and data will be collected on the cause of set failure. If a set is accidentally
pulled out, it can be replaced by the subject. Failures are based on:

1. Presence of serum ketones with hyperglycemia

2. Unexplained hyperglycemia

3. Signs of infection at the infusion site

4. Pump occlusion alarm

5. Adhesive failure

Since infusion set failures will occur after variable lengths of wear, regularly scheduled
visits are unlikely to capture the day of an infusion set failure. Instead the subject will
be taught how to insert the set, measure erythema and induration with a ruler marked in
millimeters and to take a picture of the infusion site. Subjects will be instructed to text
the study team when they remove their infusion set and to send a picture of the infusion site
and measurements. If there is any evidence of an infection (≥10 mm of erythema or
induration), they will be asked to come in that day for an unscheduled visit.

Inclusion Criteria:

Type 1 Diabetes by clinical definition

1. Age 22 and over

2. On tethered insulin pump therapy for at least 3 months using Lispro or Aspart insulin.

3. Hemoglobin A1c level less than or equal to 9%

4. Eating more than 60 grams of carbohydrate each day

5. For females, not currently known to be pregnant

6. Understanding and willingness to follow the protocol and sign informed consent

7. Willingness to wear the experimental infusion sets

8. Willingness to have photographs taken of their infusion sites

9. Ability to speak, read and write in the language of the investigators

Exclusion Criteria:

The presence of any of the following is an exclusion for the study:

1. Diabetic ketoacidosis in the past 3 months

2. Severe hypoglycemia resulting in seizure or loss of consciousness within 3 months
prior to enrollment

3. Pregnant or lactating

4. Known tape allergies

5. Active infection

6. A known medical condition that in the judgment of the investigator might interfere
with the completion of the protocol

7. Known cardiovascular events in the last 6 months

8. Known acute proliferative diabetic retinopathy

9. Known adrenal disorder

10. Current treatment for a seizure disorder

11. Inpatient psychiatric treatment in the past 6 months

12. Lack of stability on medication 1 month prior to enrollment including
antihypertensive, thyroid, anti-depressant or lipid lowering medication.

13. Use of SGLT inhibitor

14. Suspected drug or alcohol abuse

15. Dialysis or end stage kidney disease

Note: Adequately treated thyroid disease and celiac disease do not exclude subjects from
enrollment.