Heparin-mediated antibiotic delivery from an electrochemically-aligned collagen sheet

Area of Science:

• Biomaterials Science
• Infectious Disease Research
• Medical Device Coatings

Background:

• Implantable medical devices are widely used but prone to hardware-associated infections.
• Developing effective strategies to prevent these infections is a significant clinical challenge.

Purpose of the Study:

• To create and assess a novel biologic antimicrobial coating for medical implants.
• To evaluate the efficacy of this coating in preventing bacterial colonization and infection.

Main Methods:

• Synthesized electrochemically compacted collagen sheets with and without crosslinked heparin.
• Incubated sheets in gentamicin or moxifloxacin solutions.
• Assessed in vitro antimicrobial activity against Pseudomonas aeruginosa using diffusion assays and determined antibiotic release profiles via HPLC.

Main Results:

• Collagen-heparin-antibiotic sheets showed significantly larger inhibition zones against P. aeruginosa compared to collagen-antibiotic sheets alone.
• The antimicrobial activity persisted for five days.
• Gentamicin elution from collagen-heparin-gentamicin sheets was sustained for 29 days, remaining above the minimal inhibitory concentration, while collagen-gentamicin sheets eluted within 24 hours.

Conclusions:

• A novel local antibiotic delivery system using collagen-heparin coatings for medical implants was successfully developed.
• This innovative coating holds potential for reducing post-operative infections associated with medical hardware.