Gel Phantom with Carbon Indicators for Histotripsy Transducer Testing
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Solution Overview
Problem
Current methods for testing cavitational ultrasound transducers, such as those used in Histotripsy, are time-consuming and lack immediate indicators for spatial tissue disruption, requiring extensive in vitro and in vivo experiments with histological analysis, which is not practical for quick system performance checks or optimizing clinical parameters.
Innovation Solution
A cavitational damage indicator phantom system using a gel with embedded indicators, such as carbon particles or microspheres, that visibly change upon application of ultrasound energy, allowing for immediate visual feedback on tissue damage, enabling rapid verification of transducer efficacy and parameter settings without the need for histological examination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If histological examination is used to determine spatial extent of tissue disruption, then measurement precision is improved, but loss of time increases significantly
Solution Approach 1:
The patent creates a visual copy of the tissue disruption pattern using carbon particles that redistribute to match the cavitation zones. This visual replica allows immediate assessment of spatial extent without waiting for histological processing, resolving the time-precision contradiction by providing a real-time surrogate measurement.
Solution Approach 2:
Carbon particles serve as an intermediary substance that translates invisible cavitation damage into visible patterns. These particles are introduced into the tissue and automatically accumulate at disruption sites, acting as a mediator between the ultrasound energy and the observer, enabling immediate visual assessment without direct histological examination.
2Reliability
If in vitro and in vivo tissue disruption experiments are conducted to determine workable parameters, then reliability is improved, but productivity decreases due to time-consuming histological analysis
Solution Approach 1:
The visual indicator system creates an immediate copy of the tissue disruption pattern, allowing researchers to assess parameter effectiveness in real-time during experiments. This eliminates the bottleneck of post-experiment histological analysis, enabling rapid iteration and optimization of ultrasound parameters while maintaining experimental reliability.
Solution Approach 2:
The carbon particle visualization provides immediate feedback on the effectiveness of different parameter sets during the experiment itself. Researchers can observe the spatial extent and pattern of disruption in real-time, allowing for on-the-fly parameter adjustments and rapid optimization without waiting for delayed histological results.
3Device complexity
If no immediate indicator is provided for spatial extent of tissue disruption, then device complexity is reduced, but loss of information increases as rapid performance checking becomes impossible
Solution Approach 1:
The patent utilizes the inherent darkness of carbon particles against lighter tissue backgrounds to create visible contrast patterns. This color/contrast change mechanism provides immediate visual information about spatial disruption extent without adding complex imaging systems, maintaining device simplicity while preventing information loss.
Solution Approach 2:
The carbon particles automatically self-organize into visible patterns at cavitation sites through passive physical processes during the ultrasound treatment itself. No additional active imaging or detection systems are required - the particles perform the visualization function autonomously, maintaining system simplicity while providing complete spatial information.
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 system provides instant visual feedback on tissue damage, allowing for quick verification of transducer performance and parameter optimization, reducing the need for time-consuming histological analysis and enabling rapid testing of new acoustic parameters and scan patterns, both in research and clinical settings.
Implementation Method 1
Histotripsy mechanically damages tissue through cavitation of microbubbles
Implementation Method 2
focuses pulsed ultrasound from outside the body to a target tissue inside the body. Histotripsy mechanically damages tissue through cavitation of microbubbles
Data Source
AI summary
A cavitational ultrasound (e.g., Histotripsy) gel phantom and cavitational ultrasound testing system are provided that may include any of a number of features. One feature of the phantom and system is that it can allow for instant visual feedback on the efficacy and dosage of a Histotripsy transducer. The changes in the gel phantom can be visualized with the naked eye without having to wait for histology. The changes in the gel phantom can also be visualized with a camera, with ultrasound imaging, or with microscopy. In various embodiments, the phantom includes indicators such as carbon particles, dye-encapsulated beads, and red blood cells. Methods associated with use of the cavitational ultrasound gel phantom and testing system are also covered.