Conical RF Electrode Geometry for Skin Cooling
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Solution Overview
Problem
Existing non-ablative radio-frequency (RF) skin tightening procedures require active cooling to prevent skin burns, which increases costs and complexity due to the need for thermal gels containing expensive cooling ingredients like chondroitin sulfate and animal proteins.
Innovation Solution
A conical RF electrode with a shallow cone angle and a small flat or curved front surface allows for controlled application of RF energy, enabling skin tightening without active cooling by using a simpler lubricating gel, reducing the need for expensive cooling ingredients and maintaining skin surface temperatures below burning levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dome-shaped electrode with thermal gel is used for non-ablative RF skin tightening, then skin surface cooling is achieved, but the procedure requires expensive cooling ingredients and active cooling mechanisms
Solution Approach 1:
The patent extracts and eliminates the complex active cooling mechanism and expensive cooling ingredients (chondroitin sulfate, animal proteins) from the RF treatment system. Instead, it uses a simple lubricating gel without endothermic properties, relying on the electrode design itself to control temperature distribution and prevent skin surface burns.
Solution Approach 2:
The electrode design serves its own cooling function through its geometry. The conical shape with shallow angle and small flat front surface creates natural current density distribution that prevents excessive heat generation at the skin interface, eliminating the need for separate active cooling systems.
2Use of energy by moving object
If a dome-shaped electrode is used for RF skin tightening, then skin collagen heating is achieved, but control over RF energy density is limited
Solution Approach 1:
The electrode incorporates zones with different geometric properties: a small flat front surface for high current density and intense energy application, and a conical surface with shallower angle for lower current density. This allows the physician to select different contact configurations to match varying treatment requirements across different skin areas.
3Power
If higher power settings are used for skin tightening, then more effective collagen heating is achieved, but skin surface temperature increases causing burn risk
Solution Approach 1:
The patent changes the geometric parameters of the electrode - specifically using a conical shape with a shallower angle than traditional domes and incorporating a small flat front surface. This geometric modification alters the current density distribution, allowing higher power settings to be used effectively while maintaining safer skin surface temperatures through more uniform energy distribution.
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 new electrode design allows for more precise control over RF energy density, reducing skin surface temperature and eliminating the need for active cooling, while achieving effective skin tightening with lower power settings and a less expensive lubricating gel.
Implementation Method 1
The thermal effect depends on the conductivity features of the treated tissue. Collagen fibrils, when heated, will tend to denature and contract
Implementation Method 2
A typical gel that can be used contains merely water, a preservative, a thickening agent to stabilize the emulsion, and a hygroscopic agent to aid in wetting the skin
Data Source
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AI summary
An electrode especially useful for RF skin tightening procedures is characterized by an active front that is conical in part with the conical surface having a cone angle that is shallower than the corresponding angle in known electrodes. Preferably, the electrode of the invention has a conical section whose surface forms an angle greater than 60 degrees with the longitudinal axis of the electrode, and the outside diameter of the conical section is greater than 50% of the overall outside diameter of the electrode.