Page 60 - JSOM Fall 2020

FIGURE 5 Secured pressures versus clicks to occlusion correlations.

(A) (B)

(C)

On all panels, data points represent per subject data in triplicate; the y-axis has secured pressures (mmHg), and the x-axis has ladder tooth ad-
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vances (clicks) to occlusion. (A) Thigh down secured pressures versus occlusion clicks, r = 0.44. (B) Thigh up secured pressures versus occlusion
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clicks, r = 0.44. (C) Arm secured pressures versus occlusion clicks, r = 0.68.
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were noted. For good strap pulls, the hands (thigh appli- using a fast, jerk type of strap pull involved failure to capture
cations) or hand (arm applications) doing the strap pulling a desirable secured pressure because the hook-and-loop to
should initially grasp the strap close to where it exits the re- hook-and-loop securing interaction occurred during a move-
direct buckle rather than farther from the redirect buckle. ment rebound to a suboptimal pressure. Changing the style
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For best application of physics concepts, the strap pull di- of pulling to a slightly slower, non-jerky pull with emphasis
rection should be as close to parallel to the portion of the on achieving hook-and-loop to hook-and-loop interaction at
strap entering the redirect buckle as possible without cre- the tightest point resulted in applications with higher secured
ating hook-and-loop to hook-and-loop interaction during pressures. Videos of correct applications can be seen in ref-
the strap pulling. Straight down and straight up thigh ap- erences 22–24.
plication pulls with the redirect buckle on the lateral sur-
face of the thigh start out with this strap relationship but Because of the slight tackiness of the surface underneath the
undergo strap angle change as tissue compression results in ladder portion of the OMNA Marine Tourniquet, the tourni-
redirect buckle movement. Strap pulling should not involve a quet does not slide around the limb during strap pulling. This
jerk type of motion because the pressure goal is the secured allows pulling of the strap with both hands in two-handed
pressure, not the peak pressure during the pull. Applications applications and simplifies one-handed applications. Not

58 | JSOM Volume 20, Edition 3 / Fall 2020