Fractional Laser Skin Resurfacing with Mechanical Compression
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Solution Overview
Problem
Current laser-based fractional resurfacing methods for skin rejuvenation often result in non-directional skin tightening, visible scarring, and prolonged healing times due to the uniform nature of tissue removal and the formation of a rigid thermal cuff around ablated holes, which limits the extent of skin area reduction.
Innovation Solution
A method and system utilizing ablative laser technology to create small, directional holes in the skin with controlled dimensions and shapes, combined with mechanical stresses applied during the healing process to enhance skin shrinkage and collagen alignment, using an optically transparent plate to disrupt the thermal cuff and promote directional closure of holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If ablative laser is used to vaporize skin tissue to reduce skin area, then skin rejuvenation and wrinkle reduction are achieved, but the thermal cuff formed around ablated holes limits further shrinkage and causes prolonged healing
Solution Approach 1:
The patent applies mechanical compression stress to the treated skin area immediately after laser ablation, before the thermal cuff fully forms and hardens. This preliminary mechanical action prevents the thermal cuff from completely sealing the ablated holes, allowing continued tissue shrinkage and area reduction while maintaining the beneficial thermal effects for collagen remodeling.
Solution Approach 2:
Instead of allowing the thermal cuff to form naturally and then dealing with its limiting effects, the patent inverts the approach by applying mechanical compression to actively disrupt and prevent thermal cuff formation. This reverses the conventional sequence where thermal effects dominate, giving mechanical control over the healing process to achieve greater area reduction.
2Shape
If uniform fractional ablation is applied to tighten skin, then general firming is achieved, but directional wrinkle reduction and skin area shrinkage are limited
Solution Approach 1:
The patent introduces asymmetric mechanical compression by applying stress in specific directional patterns rather than uniform compression from all directions. This asymmetric mechanical force, combined with the fractional ablation pattern, creates directional collagen alignment and preferential shrinkage in targeted areas, enabling wrinkle-specific treatment while maintaining overall skin firming.
Solution Approach 2:
The patent applies different compression stresses to different regions of the treated area based on specific wrinkle patterns and desired outcomes. By localizing the mechanical stress application to match the anatomical orientation of wrinkles and skin laxity patterns, the treatment achieves directionally-controlled tightening while preserving natural skin contours and avoiding uniform distortion.
3Area of stationary object
If large fraction of skin surface is ablated to achieve significant area reduction, then more tissue is removed, but visible scarring and prolonged erythema increase
Solution Approach 1:
The patent segments the ablation process into multiple fractional passes rather than attempting to achieve the desired area reduction in a single high-density treatment. Each pass creates shallow, widely-spaced ablated holes that heal rapidly without scarring. The cumulative effect of multiple passes achieves significant area reduction while maintaining skin integrity and avoiding the thermal damage and scarring associated with single-pass high-density ablation.
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 allows for a minimally invasive, safe, and effective reduction in skin area with reduced scarring and faster healing, achieving directional skin tightening and improved cosmetic outcomes without the need for professional medical expertise.
Implementation Method 1
Ablative fractional thermolysis, or fractional resurfacing, is a treatment that uses laser light sources, such as erbium or carbon dioxide (CO2) lasers, to vaporize a plurality of microscopic holes within skin
Implementation Method 2
The process of ablation or tissue vaporization removes tissue and generates heat that denatures the surrounding collagen layers
Implementation Method 3
The process of ablation or tissue vaporization removes tissue and generates heat that denatures the surrounding collagen layers
Implementation Method 4
Fibril bundles in the collagen shrink and can tighten the dermal layer
Implementation Method 5
using an optically transparent plate to disrupt the thermal cuff and promote directional closure of holes
Data Source
AI summary
Exemplary methods and systems can be provided for resurfacing of skin that include formation of a plurality of small holes, e.g., having widths greater than about 0.2 mm and less than about 0.7 mm or 0.5 mm, using ablative electromagnetic radiation, e.g., optical energy. An optically transparent plate or window can be pressed over a surface of the skin tissue as the holes are ablated to disrupt formation of a thermal cuff around the holes. Compressive or tensile forces can then be applied to the treated region of the skin tissue as the damage heals to facilitate hole closure and provide enhanced and/or directional shrinkage of the treated skin area.