Fall-away Platform Reduces Skull Compression in TBI Models
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Solution Overview
Problem
Current methods for inducing mild traumatic brain injuries (mTBIs) in animal models lack reproducibility and fail to accurately simulate the compressive forces experienced in human mTBIs, often resulting in severe injuries or difficulties in producing concussive injuries that mimic human concussion.
Innovation Solution
A novel device featuring a resettable fall-away platform and adjustable magnetic flux apparatus that reduces compressional forces, allowing for the induction of ultra-mild injuries by causing the platform to drop upon impact, thereby minimizing tissue compression and anesthesia effects, and facilitating the production of injuries that are highly translational to human mTBIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard platform is used to support the mouse head prior to impact, then the mouse is stable and positioned correctly, but large compressive forces act on the skull resulting in severe injuries
Solution Approach 1:
The patent applies beforehand cushioning by replacing the hard platform with a soft, compliant platform that absorbs and distributes compressive forces before impact occurs. This cushioning effect prevents excessive force transmission to the skull during the impact event, resolving the contradiction between stable positioning and harmful compressive forces.
Solution Approach 2:
The patent changes the physical parameter of the platform from hard to soft, fundamentally altering its mechanical properties. This parameter change allows the platform to maintain positioning stability while simultaneously reducing compressive forces through its compliant nature, directly resolving the technical contradiction.
2Reliability
If CCI devices with electromagnetic coils are used, then reproducible injuries are produced, but the injuries tend to be severe and have poor adjustability for reducing impact severity
Solution Approach 1:
The patent introduces dynamics by making the platform movable rather than fixed. The platform can be adjusted to different heights and positions, allowing dynamic control of impact parameters. This enables the same device to produce varying injury severities while maintaining reproducibility, resolving the contradiction between reliable injury production and adaptability for severity adjustment.
Solution Approach 2:
The patent enables parameter changes by allowing adjustment of platform height, impactor mass, and impact velocity. These adjustable parameters provide versatility in controlling injury severity while maintaining the reproducibility characteristic of CCI devices, directly addressing the technical contradiction.
3Object-affected harmful factors
If the mouse is placed on a soft platform to reduce compression, then compressive forces are reduced, but the model has difficulty producing concussive injuries under deep anesthesia
Solution Approach 1:
The patent applies parameter changes by adjusting anesthesia depth to lighter levels rather than using deep anesthesia. This parameter adjustment, combined with the soft platform, allows the system to reduce compressive forces while maintaining the ability to produce concussive injuries, resolving the contradiction between force reduction and reliable concussive injury production.
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 device enables the induction of ultra-mild injuries with minimal unconsciousness and reduced Glial Fibrillary Acidic Protein (GFAP) levels, improving the reproducibility and translational relevance of mTBI models, making them suitable for studying long-term behavioral and neuronal pathologies.
Implementation Method 1
adjustable magnetic flux apparatus that reduces compressional forces, allowing for the induction of ultra-mild injuries by causing the platform to drop upon impact
Implementation Method 2
causing the platform to drop upon impact, thereby minimizing tissue compression and anesthesia effects
Data Source
AI summary
Devices and systems are disclosed which reduce compressional forces and allows for the induction of mild CCI injuries. An exemplary device features a resettable fall-away platform which allows for ultra-mild injuries to be induced on mice that are under light anesthesia. The result is injuries which do not produce long periods of unconsciousness, do not cause compressive injury and cause no increase in time-to-righting over control mice.