Focused Treatment Tip Design for Cryosurgery Heat Transfer Control
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Solution Overview
Problem
Existing cryosurgical devices with simple cone or funnel designs suffer from inefficiency due to rapid evaporation of liquified gases, leading to inconsistent treatment and increased gas usage, as they draw heat not only from the target area but also from the surrounding environment and cone materials.
Innovation Solution
The development of focused treatment tips (FTTs) with controlled geometric and material designs that minimize heat loss to the environment, featuring an evaporation control section, a boiling section, and a skin interface section, allowing for targeted heat transfer and reduced gas usage, enabling precise control over the evaporation rate and treatment duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple cone or funnel design is used to direct liquified gas to the target spot, then the device structure is simple and easy to manufacture, but rapid evaporation occurs due to heat loss from the surrounding environment and cone materials, resulting in inconsistent treatment and increased gas usage
Solution Approach 1:
The device is divided into distinct functional sections: an evaporation control section with a determined opening area, a boiling section, and a skin interface section. This segmentation allows each section to be optimized for its specific function, particularly controlling heat loss in the evaporation control section while maintaining manufacturing simplicity.
Solution Approach 2:
Different sections of the device have different geometric properties tailored to their specific functions. The evaporation control section has a determined opening area to control heat loss, while the skin interface section has a shape that matches the target area geometry. This local optimization of geometric quality addresses heat loss issues without requiring complete redesign of the entire device.
2Device complexity
If a simple cone or funnel design is used, then the device complexity is low, but the treatment consistency deteriorates due to rapid evaporation and heat loss from surrounding environments
Solution Approach 1:
The device is segmented into functional sections including an evaporation control section with a determined opening area that specifically controls heat loss. This segmentation enables consistent treatment by preventing premature evaporation while maintaining relatively simple device overall structure.
Solution Approach 2:
The device utilizes determined geometric parameters, particularly the opening area of the evaporation control section and the shape of the skin interface section, to control the evaporation rate and heat transfer characteristics. These parameter optimizations ensure treatment consistency without significantly increasing device complexity.
3Device complexity
If the cone or funnel has a large open end to maximize area, then the device structure is simple, but heat loss to the environment increases instead of concentrating heat transfer towards the treatment area
Solution Approach 1:
The evaporation control section has a determined opening area that is specifically optimized to control heat loss. This local geometric optimization ensures that heat transfer is concentrated toward the treatment area rather than being maximized at the open end, addressing the energy loss issue without complicating the overall device structure.
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
FTTs provide more effective cryosurgical treatments by concentrating heat transfer on the target area, reducing the volume of liquified gas needed and increasing treatment efficiency, with the ability to observe boiling and adjust evaporation rates for improved outcomes.
Implementation Method 1
the liquified gas contacts the treatment surface, draws heat from the contact point with the tissue
Implementation Method 2
rapid evaporation due to the liquified gas drawing heat not only from the target contact spot
Implementation Method 3
The geometric construction of the devices provides freezing and controls the rate of evaporation and, therefore, the rate of heat transfer at the interface between the gas and target tissue
Implementation Method 4
freezes the tissue by overcoming the local tissue temperature when the liquified gas is allowed to stay in contact long enough
Implementation Method 5
the liquified gas contacts the treatment surface, draws heat from the contact point with the tissue
Data Source
AI summary
A focused treatment tip (FTT) for controlling the evaporation rate and providing targeted delivery of low temperature liquified gases for contact with living tissue includes a contoured body. When filled with liquified gas, the device insulates the gas from waste heat sources, such as the surrounding environment. The device can control the evaporation rate of the liquified gas at the treatment site. The controlled evaporation rate affects the rate of heat transfer from the treated tissue allowing for controlled exposure times and desired outcomes. The device can be used with various application tips to further define the target tissue area to be treated while minimizing collateral damage to surrounding tissue and isolating the gas within the contoured body and focusing heat transfer to the desired treatment area. The device may use transparent materials that make the treatment visible to the operator while the liquified gas is evaporating.