Closed-Head Impact Model of Engineered Rotational Acceleration. CHIMERA devices (there are several models) smash mice, rats, and ferrets in the head at adjustable angles and speeds to cause concussions and traumatic brain injuries.
This article in the journal Experimental Neurology provides an overview:
https://www.sciencedirect.com/science/article/pii/S0014488620302405
See also: chimera