Development and characterization of a biomimetic coating for percutaneous devices

Alexis Trent, Mark E. Van Dyke

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Percutaneous osseointegrated prosthetics (POP), which consist of a metallic post attached to the bone that extends outward through the skin to connect to an external prosthesis, have become a clinically relevant option to replace the typical socket-residual limb connection. POP devices offer several advantages such as mechanical off-loading of soft tissues, direct force transfer to the musculoskeletal system, greater proprioception, and overall improvement in limb kinesis compared to a socket system. However, POP devices create several challenges including epidermal downgrowth, increased infection risk, and mechanical tearing at the skin-implant interface. To address these issues, biomimetic surfaces and coatings have been developed in an attempt to create an infection-free and cohesive interface between POP devices and skin. The fingernail is a prime example of a natural system with a skin interface that is both mechanically and biologically stable. Exploiting keratins’ previously demonstrated tissue compatibility and creating a biomimetic coating for POP devices that can imitate the human fingernail, and demonstrating its ability to promote a stable interface with skin tissue is the goal of this work. Silane coupling aided in producing a coating on titanium substrates consisting of human keratin proteins. Several combinations of silane and keratin derivatives were investigated, and in general showed a nano-scale coating thickness that supported skin cell (i.e. fibroblast and keratinocyte) adhesion. Initial enzyme-mediated degradation resistance was also demonstrated, but the coatings appeared to degrade at long time periods. Importantly, keratinocytes showed a stable phenotype with no indication of wound healing-like activity. These data provide justification to further explore keratin biomaterials for POP coatings that may stabilize the implant-skin interface.

Original languageEnglish (US)
Article number110351
JournalColloids and Surfaces B: Biointerfaces
Volume182
DOIs
StatePublished - Oct 1 2019
Externally publishedYes

Keywords

  • Biomimetic
  • Coating
  • Keratin
  • Osseointegrated
  • Percutaneous
  • Prosthetic

ASJC Scopus subject areas

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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