Metal Foam Inductive Heating for Rapid Cryopreservation Warming
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Solution Overview
Problem
Current methods for cryoprotecting biological tissues face challenges in achieving rapid and uniform warming rates from the vitrified state, which can lead to devitrification and thermal stress, and require high concentrations of cryoprotective agents, increasing toxicity.
Innovation Solution
The use of metal foams, foils, or seeds, such as copper or aluminum, for inductive heating, which enables ultra-rapid warming rates up to 2000°C/min and reduces cryoprotective agent toxicity by allowing lower concentrations, while avoiding the use of magnetic nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional warming methods are used, then the warming process is simple to implement, but the warming rate is slow and non-uniform leading to devitrification and thermal stress
Solution Approach 1:
Metal foam or metal foil is introduced as an intermediary heating element that mediates between the external heat source and the biological tissue. The metal component absorbs electromagnetic energy and converts it to thermal energy, which is then transferred uniformly to the surrounding tissue, achieving both rapid and uniform warming rates while preventing devitrification and thermal stress.
Solution Approach 2:
Metal foam with controlled porosity (e.g., 90-95% porosity) is used to increase the surface area and improve heat distribution throughout the tissue. The porous structure allows better thermal contact with the surrounding cryoprotective solution and tissue, enabling more uniform heat transfer and preventing localized thermal stress while maintaining ultra-rapid warming rates.
2Reliability
If high concentrations of cryoprotective agents are used, then vitrification is achieved, but toxicity increases
Solution Approach 1:
Ultra-rapid cooling rates (achieved through the metal foam/foil system) allow the system to skip through the crystallization zone and directly transition to the vitrified state. This rapid transition reduces the time the tissue spends in intermediate states that would require high concentrations of cryoprotective agents, thereby achieving vitrification with lower CPA concentrations and reduced toxicity.
Solution Approach 2:
The invention changes the cooling rate parameter to achieve ultra-rapid cooling (thousands of degrees per minute), which fundamentally alters the phase transition behavior of the cryoprotective solution. This parameter change enables vitrification at lower cryoprotective agent concentrations by preventing ice crystal formation through the speed of the transition rather than through high chemical concentration.
3Reliability
If ultra-rapid warming rates are achieved, then thermal stress and devitrification are reduced, but the complexity of the warming system increases
Solution Approach 1:
Metal foil provides a simple, flexible heating element that can be easily integrated into the cryopreservation system. The thin film structure allows for uniform heat distribution and easy removal after use, achieving ultra-rapid warming without significantly increasing system complexity. The foil can be wrapped around or placed within the tissue sample, providing straightforward implementation.
Solution Approach 2:
The combination of metal foam/foil with cryoprotective solution creates a composite system that leverages the high thermal conductivity and electromagnetic energy absorption of metal alongside the protective properties of the CPA. This composite approach enables ultra-rapid warming through electromagnetic induction while maintaining tissue viability, without requiring complex heating mechanisms.
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
This approach achieves significantly higher warming rates than conventional methods, reducing thermal stress and cryoprotective agent toxicity, enabling the safe and efficient vitrification and storage of biological tissues.
Implementation Method 1
The use of metal foams, foils, or seeds, such as copper or aluminum, for inductive heating, which enables ultra-rapid warming rates up to 2000°C/min
Implementation Method 2
The metal component can include a metal foam, a metal foil, or a metal seed... achieves significantly higher warming rates than conventional methods
Data Source
AI summary
Compositions and methods for cryoprotecting a biological tissue can involve a cryoprotective agent and a metal component that includes a metal foam, a metal foil, or a metal seed. The method allows the biological tissue to be rewarmed at a rate of at least 100° C./min.