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Nested Fluid-Structure Interaction Predictive Modeling of Fetal Brain Stress During Maternal Trauma
Jonathan Mayer1, Molly Bekbolatova1, Timothy Devine2
1Algorithmic Medicine Laboratory, Department of Osteopathic Manipulative Medicine, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York, NY 11568, USA.
Biology
|May 26, 2026
Summary
Maternal trauma during pregnancy is risky, but the fetus has layered protection. Computational models show amniotic and cerebrospinal fluid systems significantly reduce impact stress on the fetal brain.
Area of Science:
- Biomedical Engineering
- Computational Mechanics
- Fetal Development
Background:
- Maternal trauma (e.g., accidents, seizures) affects 6-8% of pregnancies, posing risks to fetal development.
- Existing research often overlooks the integrated protective role of amniotic and cerebrospinal fluids.
- Previous models treated the fetus as a homogeneous structure, neglecting its nested protective architecture.
Purpose of the Study:
- To computationally model the integrated protective system of the fetus against mechanical trauma.
- To analyze the combined cushioning effects of amniotic fluid and cerebrospinal fluid.
- To investigate the stress distribution and movement of the fetal brain during trauma.
Main Methods:
- Implemented a nested fluid-structure interaction framework using smoothed particle hydrodynamics and finite element methods.
- Simulated three hierarchical systems: uterine wall-amniotic fluid, amniotic fluid-fetal body, and cranial system (skull, CSF, brain).
- Utilized experimental data from a medical simulation mannequin subjected to seizure-like forces for boundary conditions.
Main Results:
- Amniotic fluid absorbed most impact forces; cerebrospinal fluid further reduced stress via pressure redistribution, exceeding 90% total reduction.
- Predicted peak fetal brain stress remained below adult injury thresholds, with minimal fetal brain movement.
- Elevated stress was noted in the frontal lobe and brainstem, but within potentially tolerable ranges.
Conclusions:
- The nested fluid protection architecture acts as an integrated system for sequential energy dissipation.
- Computational models suggest significant mechanical protection for the fetus during trauma.
- Findings require experimental and clinical validation before clinical application.
