Microfluidic engineering for organoid formation, cultivation, and sensing

Organoids have emerged as powerful in vitro models for studying tissue morphogenesis, organogenesis, and disease mechanisms. However, they are typically generated and maintained in static culture without perfusion, a configuration that imposes fundamental biophysical constraints and thereby restricts their physiological relevance. This review examines how microfluidic engineering addresses these limitations across the entire organoid workflow, from formation and long-term culture to integrated biosensing. First, we analyze how material selection, flow actuation, and channel hydrodynamics define the engineering basis for controlled microenvironments. We then classify microfluidic architectures by function: geometric confinement and droplet microfluidics for organoid formation; mechanical stimulation, vascularization, co-cultivation, and gradient control for long-term culture; and on-chip imaging with physical and biochemical sensors for real-time monitoring. By mapping these engineering solutions onto specific biological bottlenecks–diffusion-limited transport, the absence of vasculature, and sparse inter-tissue crosstalk–we identify persistent challenges in reproducibility, standardization, and sensor integration. Finally, we discuss the path toward regulatory qualification of such platforms and their potential to advance personalized medicine while reducing reliance on animal testing.