Reapplication
ADHESION, DECAY, BEND
Successful completion of all 18 reapplication trials was seen with the OxySoftN sensor. However, in 60% of cases, the MaxN sensor lost adhesion prior to the 18th trial. To gain a better insight into this observation, we compiled the calculated values for the 18 sequential runs sorted by code for the 20 individuals who participated in this study. The group averages for each device obtained from the tail and optical regions were then plotted as a function of the sequential run number (Figures Mean peel force (g), as measured at the tail region, required to remove OxySoftN and MaxN sensors during the 180° peel test at each test run. The black solid line represents the mean peel force for each test run of the OxySoftN sensor. The dotted black line represents the decay trendline for the OxySoftN sensor. The gray solid line represents the mean peel force for each test run of the MaxN sensor. The dotted gray line represents the decay trendline for the MaxN sensor.Work required, as measured at the optical region, to remove OxySoftN and MaxN sensors during the 180° peel test at each test run based on area under the curve. The black solid line represents mean work for each test run of the OxySoftN sensor. The dotted black line represents the decay trendline for the OxySoftN sensor. The gray solid line represents mean work for each test run of the MaxN sensor. The dotted gray line represents the decay trendline for the MaxN sensor.It should be appreciated that interpreting the data obtained from the optical region is complicated, as factors other than the adhesion can impact the work required to remove the device from the skin. Chief among these is that this region contains the sensors, causing it to be stiffer, and thus more work is required to bend the region back on itself to achieve the 180° pull. Nevertheless, we feel that it is the loss of adhesion that is primarily responsible for the observed behavior.