RF Electrode Protrusions for Uniform Tissue Heating
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Solution Overview
Problem
Existing RF devices for non-ablative skin treatment often suffer from hot spots at the edges of electrodes due to high electric fields, leading to uneven heating and potential tissue damage, which is not completely mitigated by using electrodes with rounded edges and conductive gel.
Innovation Solution
Design of RF electrodes with a highly curved surface featuring multiple overlapped hot zones to distribute RF current density uniformly, along with protrusions to create a consistent thermal profile, and the use of conductive gel for improved contact and impedance monitoring to maintain target temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If RF energy is delivered continuously with traditional smooth electrodes, then treatment effect is achieved through temperature elevation, but hot spots occur at electrode edges causing uneven heating and potential tissue damage
Solution Approach 1:
The electrode surface is modified with protrusions that create localized regions of different RF current density. The protrusions concentrate RF current at their tips while the valleys between them create regions of reduced current density, resulting in a more uniform overall heating pattern across the electrode surface.
Solution Approach 2:
The electrode features protrusions with specific curvature characteristics. The rounded tips of the protrusions distribute the electric field more evenly compared to sharp edges, reducing the concentration of RF current at any single point while maintaining effective heating through the curved surface geometry.
2Temperature
If treatment time is extended to achieve uniform heating, then heating level can be maintained within safety limits, but treatment becomes more expensive and annoying for the patient
Solution Approach 1:
By creating localized heating zones through protrusions, the entire electrode surface contributes effectively to uniform heating from the start of treatment. This eliminates the need for extended treatment times to compensate for edge effects, as uniform heating is achieved immediately across the treatment area.
3Object-affected harmful factors
If electrode edges are rounded and conductive gel is applied to reduce hot spots, then some mitigation is achieved, but hot spots are not completely eliminated
Solution Approach 1:
Instead of merely rounding edges, the electrode incorporates protrusions that actively create a pattern of localized current concentration and dispersion. This structured approach to local quality control ensures uniform current distribution across the entire electrode surface, completely eliminating hot spots rather than just mitigating them.
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
Achieves virtually uniform heating across the electrode area, preventing overheating and tissue damage, allowing for effective treatment of large tissue volumes for applications like wrinkle reduction and tissue tightening without the limitations of traditional methods.
Implementation Method 1
RF energy is delivered in continuous mode and the hand piece is moved over the treated area to reach a skin target temperature
Implementation Method 2
a conductive gel can be used for electrical coupling
Data Source
AI summary
An applicator includes at least one RF electrode coupled to an RF generator. The at least one RF electrode has protrusions each with a curvature radius which is equal to or greater than a curvature radius of an outer edge of the at least one RF electrode.