Abstract
Background and Aims
Recently, a new patch pump for insulin pump therapy was released. In this study, data obtained on the basal rate accuracy of the new pump were assessed and compared to data obtained with a previously tested established patch pump.
Methods
In an experimental setting following procedures of EN 60601-2-24, basal rate accuracy of the Accu-Chek® Solo micropump was evaluated. Basal rates of 0.1 U/h and 1 U/h were tested in 9 repetitions and accuracy was determined based on weight increases over 72 h. In addition, delivery during each hour was assessed, applying limits of ±15% from target.
Results
Over the whole 72 hours of the experiment, the deviation from the expected target weight was -5.3% at a basal rate of 0.1 U/h. The pump showed a slightly lower mean weight increase (-1.9%) than expected with a preset basal rate of 1 U/h. Larger deviations were observed during the first 24 h. Of individual 1-hour windows, 51% (0.1 U/h) and 98% (1 U/h) were within ±15% of target.
Conclusions
The new patch pump delivered insulin more accurately with the larger basal rate than at the small basal rate. Compared to the previously tested Omnipod, mean deviation at the larger basal rate was similar, but precision was higher for the Accu-Chek Solo micropump, especially at the low basal rate.
