Rotational TBI Rodent Model Using Pendulum Helmet Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current models for rotational traumatic brain injury (rTBI) in rodents lack accuracy in replicating human phenotypes due to insufficient scaling of rotational forces to small brain structures, limiting their effectiveness for preclinical studies and therapeutic screenings.
Innovation Solution
A testing device and model that induce repetitive, rotational head trauma in rodents by applying clinically relevant angular rotational acceleration and deceleration forces, simulating the rotational forces experienced in human rTBI, thereby causing injuries to intracranial tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large animal models are used for rotational TBI, then physiological relevance is improved, but cost and statistical power for genetic manipulations deteriorate
Solution Approach 1:
The patent creates a scaled-down copy of the human brain structure using rodent models with implanted gyrencephalic structures that replicate human cortical folding patterns. This allows small animal models to reproduce human-like rotational injury mechanics while maintaining the cost and genetic manipulation advantages of rodent systems.
Solution Approach 2:
The patent transforms the physical parameters of the injury model by scaling rotational acceleration forces to match human clinical ranges (1-3 Krad/s²) while using rodent subjects. This parameter adjustment enables physiologically relevant injury modeling in small animals without requiring large animal subjects.
2Measurement precision
If rotational forces are scaled to small rodent brains, then model accuracy for preclinical studies is improved, but device complexity and difficulty of implementation worsen
Solution Approach 1:
The patent divides the injury delivery system into separate functional components: a restraint system for positioning, a helmet assembly for force application, a pendulum mechanism for controlled impact, and an impact fixture for precise contact. This segmentation allows each component to be optimized independently while maintaining overall system accuracy.
Solution Approach 2:
The patent introduces a helmet assembly as an intermediary device between the pendulum impactor and the rodent head. This helmet translates linear pendulum motion into rotational acceleration of the rodent head, enabling precise control of rotational forces while simplifying the overall mechanism.
3Loss of information
If previous rodent models (MCW, CHIMERA) are used, then initial characterizations are achieved, but equivalent scalar angular forces and therapeutic screening capability are limited
Solution Approach 1:
The patent transforms static injury models into dynamic, controllable systems where rotational acceleration parameters (magnitude, duration, direction) can be precisely adjusted and repeated. This dynamic control enables systematic therapeutic screening by allowing multiple animals to receive identical, reproducible injury parameters.
Solution Approach 2:
The patent employs periodic pendulum swings to deliver repetitive rotational impacts to multiple animals with consistent timing and force parameters. This periodic action enables high-throughput therapeutic screening by standardizing the injury delivery process across numerous subjects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The model demonstrates acute and prolonged pathological, behavioral, and electrophysiological effects of rTBI, allowing for the investigation of mechanisms and potential treatments, including the identification of aberrant Cyclin-dependent kinase 5 (Cdk5) activity as a mediator of rTBI and the pharmacological inhibition of Cdk5 to reduce cognitive and pathological consequences.
Implementation Method 1
The testing device induces angular rotational acceleration and deceleration forces that result in injury or insult to the integrity of the intracranial tissues of the brain
Implementation Method 2
a pendulum arm, and an impact fixture... a portion of the impact fixture contacts the strike plate when the pendulum is in motion
Data Source
AI summary
A model and testing device for creating repetitive, rotational head trauma in rodents is disclosed herein. The testing device induces angular rotational acceleration and deceleration forces that result in injury or insult to the integrity of the intracranial tissues of the brain for the test animal and can be used to characterize, test the effects of, and/or investigate a therapeutic agent for rotational traumatic brain injury. In some embodiments, the testing device contains an animal restraint that is configured to secure the animal therein, while allowing the animal's head to rotate about the coronal plane during and following impact. The testing device can include an animal restraint, a restraint mount, configured to receive the animal restraint, a helmet assembly attached to the subject restraint mount, such that the helmet assembly is in pivotal rotation about a central axis of rotation, a pendulum arm, and an impact fixture.