I was dreadful at changing my cannula when on tubed pump. All I can advise is to put in less insulin but that still relies on changing the set when you change the cartridge. I'm now on a patch pump which expires after 72hrs so have to change the site as it's part of the whole thing xx
Be advised that your problem may be with your insertion technique, to verify please examine the infusion set when extracted to see if the tubing has been bent. I noticed when inserting the infusion set that I had the same type of problems and tracked it back to removal of the protective cap on the needle. There are two things to watch for during the cap removal, first is the removal of the tape and second is the protective cap, both of which will generate an unwanted upward force on the plastic tubing surrounding the needle. Both will cause the tubing to be pulled back by your skin as it will be the first impacted by the tubing before the needle is able to create an opening which will generate a rolling or bending of the tubing during the insertion. Solution, I would suggest that you first remove the adhesive tape and then use a downward force on the protective cap to reseat the plastic tubing on the needle, next rotate the cap until it has fully disconnected and will then fall freely off into your hand. I have now noticed that my previous recommendation to rotate the cap 360 degrees is no longer valid with the new infusion sets you may have to rotate 2-4 times before the cap disconnects.
I should note that the tubing can also roll inward forming a donut shape which is not visible without using magnification to verify a problem, this will cause a restriction which can cause an error when pumping insulin into the cannula. While the tubing may not be bent when extracted and the pump may also appear to be operating normally after extraction, with the combination of backward pressure from the body combined with the donut shape will provide an explanation of the problems we see with the cannula.
These are just my observations, but you may try a simple test, when removing the cap, first lift upward vertically to determine if it is still attached this will show if you are generating a unwanted force thus creating a problem. This also applies to anyone who uses the serter device!
