Acute cellular interaction with textured surfaces in blood contact

Area of Science:

• Biomaterials Science
• Medical Device Engineering
• Hemodynamics

Background:

• Textured surfaces on blood-contacting medical devices can promote pseudo-neointima formation, a layer of cells that can improve biocompatibility.
• Understanding how surface topography influences cellular deposition is crucial for designing effective medical implants.

Purpose of the Study:

• To investigate the hypothesis that controlling surface texturing can regulate pseudo-neointima thickness.
• To evaluate the effect of different fiber lengths on polyurethane surfaces exposed to flowing blood.

Main Methods:

• Fabrication of polyurethane textured surfaces with varying fiber lengths.
• Ex vivo ovine carotid-jugular shunt experiments for up to 4 hours of blood exposure.
• Computational fluid dynamics modeling to assess wall shear stress on textured surfaces.
• Quantification of white blood cell density using electron microscopy and image analysis.

Main Results:

• White blood cells were the predominant cell type deposited on textured surfaces.
• Macroscopic thrombus formation was rare, occurring in only one of nine experiments.
• Cellular deposition was influenced by wall shear stress, longitudinal position, and blood-contact time.

Conclusions:

• Surface texturing shows potential for controlling blood-material interactions in medical devices.
• The study highlights the importance of surface topography in modulating cellular responses, primarily white blood cell adhesion.
• Further research can leverage these findings to design next-generation blood-contacting biomaterials with enhanced biocompatibility.