Surface modification of silicone for percutaneous implantation

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Medical Device Development

Background:

• Percutaneous silicone devices are prone to epidermal down growth and bacterial infection.
• Immobilizing collagen onto device surfaces is a strategy to improve biocompatibility.

Purpose of the Study:

• To evaluate the efficacy of collagen immobilization on silicone devices in preventing epidermal down growth.
• To assess the impact of collagen-immobilized polyethylene sponges on bacterial infection rates in percutaneous implants.

Main Methods:

• Collagen was covalently immobilized onto silicone device surfaces using poly (acrylic acid) grafting.
• Collagen-immobilized silicone devices, with and without polyethylene sponges, were percutaneously implanted in rabbits.
• Epidermal down growth and bacterial infection were monitored over extended periods.

Main Results:

• Collagen immobilization prevented epidermal down growth for up to 7 weeks post-implantation.
• Devices without collagen immobilization showed epidermal down growth within 3 weeks.
• Collagen-immobilized sponges significantly reduced bacterial infection, with only 1 of 7 models infected by week 5, compared to 6 of 7 in non-immobilized controls by week 10.

Conclusions:

• Collagen immobilization is an effective method to prevent epidermal down growth around percutaneous silicone implants.
• Collagen-immobilized polyethylene sponges enhance implant stability and substantially reduce the incidence of bacterial infection.
• This approach offers a promising strategy for improving the safety and longevity of percutaneous medical devices.