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The cover image is based on the article Moisture-Responsive Friction Adaptability: Rethinking the Conventional Skin Silicone Interfaces in Pressure Injury Prevention Dressing Designs by Amit Gefen et al., https://doi.org/10.1111/iwj.70860.
The cover image is based on the article Moisture-Responsive Friction Adaptability: Rethinking the Conventional Skin Silicone Interfaces in Pressure Injury Prevention Dressing Designs by Amit Gefen et al., https://doi.org/10.1111/iwj.70860.
This study evaluated the frictional properties of the skin-contact interfaces of two multilayer prophylactic dressings under simulated perspiration conditions. The tested dressings were identical except for the skin-contact interface, which was either silicone-made or Hydrofiber-made, that is, AQUACEL Hydrofiber Technology. Using a standardised tribological ‘sled test’ setup and a skin-mimicking polymer substrate, we measured the static and kinetic coefficients of friction for each dressing interface type at varying moisture levels. The dressing with the Hydrofiber interface consistently demonstrated significantly lower static and kinetic coefficients of friction compared to the silicone-based dressing, across all moisture conditions. The Hydrofiber interface exhibited a sharp coefficient of friction reduction with minimal (5%) moisture accumulation, mimicking overnight perspiration under thermoneutral conditions. This dressing maintained the low coefficient of friction levels at a steady level of approximately 0.2 until full saturation. In contrast, the silicone interface retained high (> 1) coefficients of friction regardless of moisture. These findings highlight an important biomechanical advantage of Hydrofiber skin-contact materials in reducing frictional forces at the skin-dressing interface, especially in moisture-prone body areas, in a pressure injury prevention context. Friction-responsive skin-contacting dressing materials with low coefficients of friction, which remain low while they become moist due to perspiration accumulation, should be preferred for preventative dressings.
Effective thermal management at the skin-dressing interface is essential in pressure injury prevention by means of prophylactic dressings. This study quantified the thermal conductivity of AQUACEL Hydrofiber Technology (AHT, hydrofiber) and polyurethane foam dressing materials under normothermic (32°C) and febrile (40°C) conditions across increasing moisture levels. Using a validated custom heat-flow meter system, dry hydrofiber exhibited significantly greater thermal conductivity than the polyurethane foam (0.43 ± 0.01 vs. 0.20 ± 0.01 W/m K at 32°C; p < 0.001). Upon hydration at 32°C, thermal conductivity values increased nonlinearly for both materials but to a much greater extent for the hydrofiber. At 15% moisture, the hydrofiber reached 4.73 ± 0.12 W/m K compared to the polyurethane foam at 1.03 ± 0.02 W/m K. At 40°C, hydrofiber achieved 3.39 ± 0.19 W/m K with only 10% moisture, indicating a temperature-responsive biphasic transformation. Overall, hydrofiber demonstrated a fivefold greater thermal conductivity response to moisture than the polyurethane foam. These findings highlight critical, material-dependent differences in heat dissipation under clinically relevant conditions. The superior moisture-responsive thermal conductivity of hydrofiber highlights its potential to improve heat dissipation at the skin-dressing interface under clinically relevant conditions and thereby mitigate local heat accumulation, contributing to skin protection. Thermal conductivity and thermal adaptability studies should be integrated into dressing efficacy research and be used for selection criteria for pressure injury prevention programs alongside mechanical and absorptive performance.
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