Wound Healing Society

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FEA Modeling And Moisture Management Properties Of A Novel Silicone Dressing
James Sieracki1, Balakrishna Haridas2, Amy K. McNulty1.
13M, St. Paul, MN, USA, 2Dept of Biomedical Eng, Texas A&M University Texas A&M University, College Station, TX, USA.

Background: In the United States, pressure injuries are believed to affect over 2.5 million people. Recent guidelines have recommended the consideration of polyurethane foam dressings on heels and the sacrum as part of a pressure injury prevention strategy. The following study assesses the reduction in tissue strain and stresses associated with the use of a new silicone foam dressing as well as its ability to manage moisture. Methods: Finite Element Analysis models (FEA) were developed and used to investigate the ability of 3M Tegaderm™ Silicone Foam (TSF) and Mepilex Border Sacrum (MBS) dressings to reduce tissue strains surrounding the sacral bone. The loading modeled on the dressings were either compression only (modeling a patient laying supine) or combined compression and shear (modeling a patient laying in a 45° Fowler position). Two commercially available silicone foam dressings were modeled as well as a no-dressing control. Fluid handling properties for TSF were assessed by applying dressings under compression to a glass cylinder. Ringer’s solution was dispensed at 1cc / hr to the dressing / cylinder interface and after 72 hours the surface area of the dressing saturated with fluid was measured. Results: FEA modeling showed that both the MBS and TSF dressings achieved reductions in tissue distortional stress and strain energy density relative to no dressing conditions. The use of either silicone foam dressing results in lower volume of tissue at higher stresses and deformation compared to no dressing. TSF dressing construction drew fluid away from the simulated patient interface and into the absorbent pad thereby minimizing the saturated surface area (26.2%) in contact with the skin. Conclusion: The results of the FEA modeling combined with the fluid handling properties of the TSF dressing demonstrate that TSF provides an option for pressure ulcer prevention programs.

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