Abstract
Background and Aims
Patch pumps are a tubeless alternative to conventional durable insulin pumps. Data obtained with two recently released new patch pumps were compared with data previously obtained with an established patch pump.
Methods
Delivery accuracy of the two insulin patch pumps Accu-Chek® Solo micropump [ACS] and A6 TouchCare® pump [A6] was tested in an microgravimetric experiment based on IEC 60601-2-24 for bolus sizes of 0.2 U, 1 U and 10 U. For the already tested Omnipod®, data were only updated testing 0.2 U boluses. Each insulin pump was tested 9 times. One data set comprised 25 (0.2 U and 1 U) or 12 boluses (10 U). A deviation of more than ±15% from target was considered relevant. In addition, delivery speed of a 10 U bolus was assessed.
Results
Bolus accuracy results are shown in the table. Mean delivery time of a 10 U bolus ranged from 04:00 min [ACS] to 06:40 min [A6].
| Bolus volume | 0.2 U | 1 U | 10 U | |
| n | 225 | 225 | 108 | |
| ACS | Mean deviation | -3.3% | 0.3% | 0% |
| % of boluses within ±15% | 88% | 99% | 100% | |
| A6 | Mean deviation | 3.3% | 4.0% | 3.1% |
| % of boluses within ±15% | 40% | 65% | 100% | |
| OmniPod* | Mean deviation | 1.5% | 0.0%* | 0.3%* |
| % of boluses within ±15% | 57% | 77%* | 100%* | |
*results from previous tests
Conclusions
All patch pumps had a mean deviation of less than 5% for all bolus sizes. ACS, however, had a higher percentage of individual boluses within ±15% of target than the two other pumps for the two smaller bolus volumes.
