Activity of antimicrobial-impregnated silicone tissue expanders

Area of Science:

• Biomaterials Science
• Infectious Disease Research
• Medical Device Innovation

Background:

• Bacterial colonization of medical devices can lead to clinical infections.
• Tissue expanders are susceptible to bacterial contamination.
• Antimicrobial impregnation may offer a strategy to mitigate infection risk.

Purpose of the Study:

• To evaluate the antimicrobial properties of minocycline/rifampin-impregnated silicone tissue expander shells.
• To assess the spectrum, durability, and shelf-life of the antimicrobial activity.
• To determine the efficacy against key bacterial pathogens.

Main Methods:

• In vitro assessment of antimicrobial activity using zones of inhibition.
• Testing against Staphylococcus epidermidis, Staphylococcus aureus, and Escherichia coli.
• Evaluation of activity after serum exposure and long-term storage.

Main Results:

• Impregnated expanders demonstrated baseline inhibition zones against tested bacteria.
• Strong residual antimicrobial activity was observed after 4 weeks in serum.
• Antimicrobial activity remained significant after 1 year of room temperature storage.

Conclusions:

• Minocycline/rifampin-impregnated tissue expanders exhibit broad-spectrum and durable antimicrobial effects.
• The antimicrobial activity of the impregnated shells exceeds one year, indicating a favorable shelf-life.
• These findings support further investigation into the clinical anti-infective efficacy of these devices.