Why Do Cannulas Bend? How to Stop Bent Cannulas for Good
If you use an insulin pump, you've probably experienced it - unexplained high blood sugar, a failed infusion site, and the frustrating discovery of a bent cannula. For people living with Type 1 diabetes, bent cannulas aren't just an inconvenience - they can mean hours of undelivered insulin and dangerous glucose spikes.
What Causes a Bent Cannula?
When you insert an infusion set, a small plastic cannula is left under the skin after the insertion needle is withdrawn. If the adhesive hasn't fully secured the site during needle withdrawal, the cannula can "tent" - lifting slightly and bending instead of staying seated properly under the skin.
Common causes include:
- Pulling the needle out too quickly
- Inserting at an incorrect angle
- Site movement during the critical first few seconds after insertion
- Skin that doesn't hold adhesive well due to sweat or activity
How to Tell If Your Cannula Is Bent
Signs of a bent cannula include:
- Blood sugar rising unexpectedly after a meal bolus
- Insulin delivery that seems normal but glucose doesn't respond
- Visible lifting or bubbling at the infusion site
- Occlusion alarms on your pump
Compatible with Major Pump Brands
Bent cannulas affect users across all major insulin pump brands including Medtronic, Tandem t:slim, Omnipod, and Insulet. Regardless of which system you use, proper cannula seating is critical for consistent insulin delivery.
A Simple Solution
The Infusion Site Stabilizer Tool is a reusable positioning aid designed to provide gentle, consistent support during infusion site application - helping ensure your cannula stays properly seated while the adhesive sets.
It's compact, easy to use, and compatible with major infusion set brands - a small tool that can make a big difference in your daily diabetes management.
Final Tips for Better Infusion Sites
- Always let the adhesive set for a few seconds before moving
- Rotate sites regularly to avoid scar tissue buildup
- Keep skin clean and dry before insertion
- Use skin prep wipes if you have adhesive issues
Living with T1D is already a full-time job. The fewer surprises from your equipment, the better.
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