Hello, for the past couple of months my daughters bloodsugars have been very difficult to manage. Also we are having a lot of trouble with the cannula's. She uses 6mm flexlink cannula's. Her levels will be ok and we bolus for food and then on the 2hourly check that we do she is high, in the late 20's with ketones present. This has happened about 5 times in the last 2 weeks and suggests to me that for some reason the bolus has not been getting through. I contacted Accu-chek about this and they sent me out a new batch of cannula's. We changed the cannula but less than 24 hrs it was leaking and her sugars were high again. She inserts the cannula into her tummy. I am just wondering if anyone has any advice or is anybody ever had the same problem with the fexlink cannula's. I am unsure whether to change and try another type and would greatly appreciate any suggestions. Martina.