Scientists built tiny 'trenches' that give cells a safe place to hide from fast-moving blood that would usually rip them to shreds.
March 20, 2026
Original Paper
Geometry-Encoded Microtrenches Stabilize Endothelium on High Shear Biomaterial Surfaces
bioRxiv · 10.64898/2026.03.16.712222
The Takeaway
Blood flow in artificial hearts is often so fast it kills the protective layer of cells on the device's surface. By adding tiny, angled ditches to the surface, researchers created 'safe zones' where cells can grow and thrive even under 'super-storm' conditions.
From the abstract
Maintaining a confluent, antithrombotic endothelium on cardiovascular biomaterial surfaces remains a major barrier to long-term hemocompatibility, as endothelial cells (ECs) rapidly denude under supraphysiological shear in prosthetic devices. Here, we hypothesized that mesoscale surface geometry (~100 --200 {micro}m) could reorganize near-wall hemodynamics, preserving endothelial coverage and function under extreme shear. Engineered microtrenches were introduced onto an implant biomaterial to ge