Sub-micron texturing for reducing platelet adhesion to polyurethane biomaterials

Keith R. Milner, Alan J. Snyder, Christopher A. Siedlecki

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


Platelet adhesion is a key event in thrombus development on blood-contacting medical devices. It has been demonstrated that changes to the chemistry of a material surface can reduce platelet adhesion. In this work, it is hypothesized that sub-micron surface textures may also reduce adhesion via a decrease in the surface area of material with which platelets can make contact, and hence a decreased probability of interaction with adhesive ligands. A polyether(urethane urea) was textured with two different sizes of sub-micron pillars using a replication molding technique that did not alter the material surface chemistry. Adhesion of platelets was assessed in a physiologically relevant shear stress range of 0-67 dyn/cm2 using a rotating disk system. Platelets were immunofluorescently labeled and adhesion was compared on smooth and textured samples. Platelet adhesion was greatest at low shear stress ranging from 0 to 5 dyn/cm2, and sub-micron textures were observed to reduce platelet adhesion in this range. Additionally, non-adherent platelets did not demonstrate large-scale activation after exposure to textured samples. We conclude that surface textures with sub-platelet dimensions may reduce platelet adhesion from plasma to polyether(urethane urea) at low shear stress.

Original languageEnglish (US)
Pages (from-to)561-570
Number of pages10
JournalJournal of Biomedical Materials Research - Part A
Issue number3
StatePublished - Mar 1 2006

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys


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