Blast Simulator Device for Real-Time Tissue Imaging
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Solution Overview
Problem
Current methods for studying the effects of blast shock waves on biological tissue, such as those causing traumatic brain injury, lack the capability for real-time monitoring of cellular behavior and fail to differentiate between direct pressure effects and secondary shear stresses.
Innovation Solution
A device that simulates an explosive blast shock wave using a source of compressed gas and a conduit system to replicate the pressure profile of a blast, allowing for real-time imaging and analysis of tissue responses, including the use of a specimen platform and imaging device to capture cellular reactions before, during, and after the blast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a barotrauma chamber is used to apply pressure evenly to all cells or tissue components, then the pressure wave can be produced by hydrostatic or fluid percussion mechanisms, but the device cannot differentiate between direct pressure effects and secondary shear stresses
Solution Approach 1:
The device segments the blast wave application into two distinct components: a primary blast wave applied to the entire tissue sample and a secondary shear stress component applied specifically to the region of interest. This is achieved through the dual-chamber design where the first chamber applies overpressure uniformly while the second chamber creates localized shear stress gradients, allowing separate study of each mechanism's effect on tissue.
Solution Approach 2:
The patent introduces a fluid medium as an intermediary between the pressure source and the tissue sample. The fluid transmits the blast wave characteristics while allowing controlled creation of shear stress gradients. This intermediary enables the differentiation between direct compression effects and shear stress effects by manipulating fluid flow patterns and viscosity characteristics.
2Reliability
If animal studies are conducted to study cellular damage mechanisms, then in vivo effects can be observed, but real-time monitoring of cellular behavior during and immediately after the blast is not possible
Solution Approach 1:
The device creates a controlled in vitro copy of in vivo blast conditions. By reproducing the Friedlander curve pressure profile and shear stress characteristics that occur during actual blast exposure, the system allows real-time observation of cellular responses without requiring live animal subjects. The copying approach maintains biological relevance while enabling high-speed imaging and real-time data collection.
Solution Approach 2:
The patent replaces the mechanical/in vivo system with an in vitro mechanical simulation system. Instead of using living animals where real-time monitoring is difficult, the device uses controlled mechanical pressure application on cultured cells with integrated imaging capabilities, substituting the complex biological system with a simplified but controllable mechanical model that allows real-time observation.
3Ease of operation
If in vitro models are used to study primary blast injury, then cellular responses can be studied, but real-time high spatial and temporal detection of cellular responses during the blast is absent
Solution Approach 1:
The device employs periodic pulsed pressure application matching the characteristic duration of blast waves (milliseconds to seconds). The pressure pulses are delivered in controlled sequences with precise timing, allowing synchronization with high-speed imaging capture rates. This periodic action enables temporal resolution of cellular responses at the moment of blast impact and during the subsequent recovery phases.
Solution Approach 2:
The system dynamically changes multiple parameters including pressure amplitude, pulse duration, rise time, and shear stress magnitude to match different blast scenarios. These parameter variations are precisely controlled and correlated with high-speed imaging data, enabling detailed study of how different blast parameters affect cellular responses in real-time with high spatial and temporal resolution.
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
Enables real-time observation and analysis of tissue responses to blast shock waves, effectively reproducing the Friedlander curve pressure profile and distinguishing between pressure and shear effects, providing insights into the mechanisms of blast-induced traumatic brain injury.
Implementation Method 1
a source of compressed gas and a primary conduit for conveying gas from the source of compressed gas
Implementation Method 2
simulates an explosive blast shock wave (BSW)
Implementation Method 3
The primary conduit terminates in a release valve that opens when gas pressure at the release valve reaches a predetermined pressure
Implementation Method 4
A secondary conduit extends at an angle (not parallel) to the primary conduit axis of gas flow and the secondary conduit terminates in an outlet orifice that directs gas from the primary conduit toward a target region
Data Source
AI summary
A device and method for simulating a blast shock wave of the type produced by explosive devices such as bombs. A pneumatic charge releases a blast shock wave along a conduit which terminates in a first outlet that communicates with the atmosphere and a second outlet that is sealed to a specimen chamber. The first outlet has a quick release valve that prevents venting of the pneumatic charge to the atmosphere until the pressure at the valve reaches a predetermined level that opens the valve. The pneumatic charge therefore initially flows through the second outlet to direct the blast into the specimen chamber, until subsequent opening of the quick release valve redirects the gas flow out of the first outlet and rapidly reduces pressure in the chamber. The blast wave closely simulates the Friedlander curve, and its effects are viewed during instead of only after the blast is completed.