Sprayable Cooling Composition Phase Transition
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Solution Overview
Problem
Conventional cold sprays provide brief and sometimes strong cooling effects, lacking the ability for gentle and long-lasting cooling, which is essential for medical treatments, sports injuries, and performance enhancement, as they often cause tissue damage due to rapid cooling and lack of targeted dosing.
Innovation Solution
A sprayable cooling composition comprising a dispersion of a liquid propellant and a refrigerant with a boiling point between -20°C and +37°C, and a cold transfer material with a melting point between -10°C and +30°C, where the refrigerant changes state to solid during application, allowing for controlled heat removal, and a binder for precise application and prolonged cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid gases are used in aerosol cans for cold spray, then flexible direct application is achieved, but the cooling effect is brief and sometimes undesirably strong
Solution Approach 1:
The invention utilizes phase transitions of the refrigerant (from liquid to solid) to achieve prolonged cooling effects. The refrigerant is designed to freeze on the tissue surface, forming an ice layer that maintains cooling for extended periods, directly addressing the brief duration problem of conventional aerosol cold sprays.
Solution Approach 2:
The invention changes the physical parameters of the cooling composition by using a dispersion of refrigerant in propellant where the refrigerant has a melting point between -10°C and +30°C. This parameter change allows the refrigerant to transition to solid state during application, fundamentally altering the duration and intensity profile of the cooling effect compared to conventional liquid gas aerosols.
2Productivity
If conventional cold sprays are used, then quick application is achieved, but tissue damage may occur due to rapid cooling
Solution Approach 1:
The controlled phase transition of refrigerant from liquid to solid provides a gradual cooling effect rather than rapid freezing. The ice layer formation process naturally regulates the cooling rate, preventing tissue damage while maintaining application speed, as the phase change occurs progressively on the tissue surface.
Solution Approach 2:
The propellant acts as an intermediary medium that controls the delivery and evaporation rate of the refrigerant. By adjusting propellant properties and composition, the release of refrigerant is moderated, preventing sudden intense cold that could damage tissue while maintaining quick application capability.
3Duration of action of moving object
If a two-stage process is used to freeze water into ice layer, then longer cooling effect is achieved, but the process becomes complicated and targeted dosing is not possible
Solution Approach 1:
The invention merges the refrigerant delivery and ice layer formation into a single integrated spray application. The refrigerant-dispersion aerosol combines the propellant and refrigerant in a stable dispersion that, upon application, automatically forms an ice layer without requiring separate steps, thus achieving prolonged cooling through simple single-stage application.
Solution Approach 2:
The refrigerant is pre-dispersed in the propellant in a stable emulsion or suspension form before application. This preliminary preparation ensures that upon spraying, the refrigerant is already positioned to freeze and form an ice layer immediately on the tissue surface, eliminating the need for separate water application and freezing steps.
4Stability of the object's composition
If the refrigerant is dispersed in propellant as an emulsion, then homogeneous spray application is achieved, but the refrigerant particles must be small enough to atomize properly
Solution Approach 1:
The refrigerant is maintained in liquid or fine particulate form within the propellant dispersion during storage, ensuring homogeneous mixing and proper atomization. The phase transition to solid occurs only after application on the tissue surface, allowing the refrigerant to be dispersed at a molecular or fine particulate level for homogeneous spraying while still achieving solid-state cooling effect.
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 composition achieves a gentle and long-lasting cooling effect, preventing tissue damage and allowing for adjustable cooling intensity and duration, maintaining a temperature difference for at least 20-30 minutes, thus enhancing medical treatments and athletic performance.
Implementation Method 1
the evaporation cold generated by the evaporating propellant is not used directly to cool the tissue, but is first transferred to a cold carrier
Implementation Method 2
the change in the physical state of the cold transfer material from liquid to solid can then be used in an advantageous manner
Implementation Method 3
which is then frozen into a layer of ice using a cold spray
Implementation Method 4
heat can subsequently be removed from the tissue in order to reverse this state again
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
The invention relates to a sprayable composition for cooling human tissue. The composition comprises a dispersion of a liquid propellant having a boiling point in the range of -45 °C to +37 °C and a coolant material dispersed in the propellant having a melting point in the range of -10 °C to +30 °C. The cooling effect is also based on the fact that the refrigerant material begins to melt after application to the tissue.