Page 166 - JSOM Fall 2020

FIGURE 8 Adhesion data of adhesive technology under different FIGURE 10 Adhesion data of adhesive technology under dirty, dry,
environmental conditions on human volunteers: ambient room and sweaty conditions on human volunteers.
temperature (23 ± 2°C), a cold environment (at least –5°C), and a
warm environment (40 ± 2°C).

FIGURE 11 Back pressure of vent unhindered and occluded with
varying levels of airflow.

FIGURE 9 Adhesion data of adhesive technology under dry and
sweaty conditions on human volunteers.

When assessed on healthy volunteers, the increase in moisture FIGURE 12 Back pressure of vent unhindered and under standard
on and within the skin does not appear to have any detrimen- UK military equipment and armor.
tal effect on the adhesive profile of the adhesive technology
(Figure 10).

The data for dirty skin under dry and sweaty conditions also
showed no detrimental effect on the adhesive properties of the
adhesive technology.

Vent Profiling
Flow/Pressure Profile With and Without Vents
Partially Blocked
The data within (Figure 11) indicate that even with half the
vents occluded, the new design of test article allows effective
use of the vent system. The increased air volume within the
pleural cavity does result in a slight increase in back pressure
caused by the vents but does not cause the vents to fail.
Channel Failure on Concave and Convex Surfaces
Pressure/Flow Profile Under Military Equipment When applied to both concave and convex surfaces, the ability
The data within (Figure 12) indicates that the vent system con- of the vent to hold a negative pressure over 3 seconds and not
tinues to operate effectively under equipment and armor, when hold positive pressure was assessed; at no point did the dress-
applied under predicted normal conditions. The increased air ing function fail.
volume within the pleural cavity does result in a slight increase
in back pressure caused by the vents, as does the application of Discussion
the armor and equipment over the test article.
The main complication associated with the use of an open
Flow/Valve Function Over the Full Wear Time pneumothorax dressing is the development of tension pneu-
The ability of the vent to hold a negative pressure over 3 sec- mothorax. The use of a vented chest seal dressing may pre-
14
onds and not hold positive pressure was assessed over a 48- vent this from occurring. To ensure the design of the vented
hour period at various timepoints; at no point did the dressing chest seal dressing is optimal and reduces the risk of further
function fail. complications related to product failure, two key elements of

164 | JSOM Volume 20, Edition 3 / Fall 2020