Thermochromic Polyacrylamide Phantom for RF Ablation Thermal Mapping
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Solution Overview
Problem
Current methods for evaluating radiofrequency ablation therapies face challenges in accurately analyzing the thermal effects and variability in tissue samples, leading to costly and inaccurate testing due to non-uniformity and subjective interpretation, especially in visualizing the effects of RF energy on tissues.
Innovation Solution
A thermochromic polyacrylamide tissue phantom is developed, comprising layers that change color in response to RF energy, allowing for precise visualization of temperature gradients, with a thermochromic layer made of microencapsulated cholesteric liquid crystals that respond over a temperature range of 50° C to 110° C, providing a consistent and reliable method for evaluating ablation therapies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional biological tissues (porcine or cadaver) are used for ablation testing, then the testing can be conducted, but the results show wide variation due to non-uniformity and subjective interpretation
Solution Approach 1:
The patent uses polyacrylamide gel as a homogeneous phantom material that uniformly mimics tissue properties. This homogeneous material eliminates the non-uniformity inherent in biological tissues, providing consistent and reproducible ablation testing results across different samples.
Solution Approach 2:
The patent incorporates thermochromic materials that undergo color changes in response to temperature variations during ablation. This provides objective, visual confirmation of thermal effects and ablation outcomes, eliminating subjective interpretation and improving measurement precision.
2Reliability
If tissue phantoms are used to provide uniform characteristics, then testing consistency improves, but visualizing thermal effects becomes difficult
Solution Approach 1:
The patent incorporates thermochromic materials that undergo color changes in response to temperature variations during ablation. This provides objective, visual confirmation of thermal effects and ablation outcomes, eliminating subjective interpretation and improving measurement precision.
3Ease of manufacture
If commonly used tissue phantom materials like agar are used, then the phantom can be manufactured, but the melting point is lower than the testing temperature
Solution Approach 1:
The patent changes the material parameter from agar to polyacrylamide gel, which has a higher melting point that exceeds the testing temperature range. This ensures the phantom material remains stable and does not melt during ablation procedures, while still providing the desired tissue-mimicking properties.
4Reliability
If traditional testing methods are used, then ablation therapies can be evaluated, but the process is costly and time-consuming
Solution Approach 1:
The patent incorporates thermochromic materials that undergo color changes in response to temperature variations during ablation. This provides objective, visual confirmation of thermal effects and ablation outcomes, eliminating subjective interpretation and improving measurement precision.
Solution Approach 2:
The patent creates a simplified phantom model that copies the essential thermal and electrical properties of biological tissue without the complexity and variability of real tissue. This allows for rapid, reproducible testing that maintains evaluation accuracy while significantly reducing time and cost.
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 thermochromic polyacrylamide tissue phantom reduces variability and testing time by providing a uniform and visually confirmable representation of thermal effects, enabling statistically significant tests to be conducted more efficiently and accurately than traditional methods.
Implementation Method 1
the thermochromic layer changes color in response to energy such as radiofrequency energy, radiant heat, cooling, microwave energy, or electromagnetic energy
Implementation Method 2
it is important to monitor the temperature of the electrode to prevent ablation of unintended tissue areas and depths
Implementation Method 3
The thermochromic layer may include microencapsulated cholesteric liquid crystals, and may include a plurality of formulations of liquid crystals
Implementation Method 4
binary thermochromic materials may be colored and opaque at room temperature, but become transparent when the threshold temperature is reached
Data Source
AI summary
A polyacrylamide tissue phantom embedded with multi-formulated thermochromic liquid crystals for use in the evaluation of RF ablation therapies is provided. The tissue phantom approximates the properties of biological tissue, and therefore provides a suitable substitute for use in testing the effects of RF and other energy-emitting devices on biological tissue. Also provided is a system for using the tissue phantom in the evaluation of RF therapies.