Flashlamp Waveguide Cooling for Localized Skin Treatment
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Solution Overview
Problem
Current flashlamp devices for dermatological treatments often cause unwanted side effects like hypo and hyperpigmentation and crusting in surrounding skin due to their large, rectangular optical apertures, and struggle with treating localized lesions, especially in dark-skinned patients, as they deliver energy to broader areas.
Innovation Solution
A flashlamp system with a handpiece featuring a small, tapered waveguide and reflector housing that focuses energy onto a small, highly divergent cone, allowing precise targeting of lesions with minimal impact on surrounding skin, using a xenon flashlamp and a thermally conductive sapphire rod for efficient cooling and reduced side effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large aperture flashlamp device is used to treat small or localized lesions, then treatment coverage is improved, but unwanted side effects such as hypo and hyperpigmentation and crusting occur in the skin surrounding the lesion
Solution Approach 1:
The optical aperture is divided into multiple segments or zones with different properties. The invention uses a multi-aperture configuration where individual apertures can be independently controlled or masked, allowing selective treatment of the target lesion while preserving surrounding skin. This segmentation enables precise spatial control of energy delivery to treat localized lesions without affecting adjacent areas.
Solution Approach 2:
Different regions of the aperture are assigned different characteristics or functions. The invention implements local variation in aperture properties through masking or selective opening of specific zones, creating areas of high energy density for treatment and areas of low or zero energy for skin protection. This local differentiation allows simultaneous treatment of the lesion and preservation of surrounding skin integrity.
2Manufacturing precision
If masking objects or agents are interposed between the light aperture and the skin to limit energy delivery, then treatment localization is improved, but device complexity and procedure time increase
Solution Approach 1:
The masking function is extracted from external physical barriers and integrated directly into the optical system. The invention incorporates masks or selective aperture elements as inherent components of the flashlamp device structure, eliminating the need for separate masking materials like Teflon tape or gauze. This integration maintains precise treatment localization while reducing procedural complexity and eliminating the need for additional masking setup and removal steps.
Solution Approach 2:
The masking function is merged with the optical aperture structure itself. The invention combines the light-delivery function and the light-blocking function into a single integrated aperture assembly, where masked regions are built into the optical path. This merging eliminates the need for separate masking components and simplifies the overall device configuration while maintaining precise spatial control of energy delivery.
3Object-affected harmful factors
If a small aperture is used to treat localized lesions, then side effects are reduced, but treatment speed and optical efficiency decrease
Solution Approach 1:
The aperture configuration is made dynamically adjustable rather than fixed. The invention implements variable aperture sizes and patterns that can be adapted to the specific lesion characteristics and treatment requirements. This dynamic capability allows the system to use smaller apertures for localized lesions to minimize side effects while switching to larger apertures for extensive treatment areas to maintain high treatment speed and efficiency.
Solution Approach 2:
The optical parameters including aperture size, shape, and distribution are made variable and adjustable. The invention enables modification of these parameters based on the specific treatment scenario, allowing optimization between treatment speed and side effect minimization. By changing aperture parameters adaptively, the system can achieve both rapid treatment of extensive areas and precise localized treatment with minimal side effects when needed.
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 system enables effective, localized treatment of vascular and pigmented lesions with reduced side effects, maintaining treatment speed and optical efficiency while allowing for precise targeting and effective skin cooling, even in hairy regions.
Implementation Method 1
flashlamps delivering controlled, intense broadband visible-to near-infrared light
Implementation Method 2
thermally conductive sapphire rod for efficient cooling
Implementation Method 3
reflector housing that focuses energy onto a small, highly divergent cone
Implementation Method 4
waveguide has maximum transverse dimensions
Data Source
AI summary
A flashlamp device having a small diameter waveguide is disclosed for use in localized dermatological applications. A preferred waveguide has a curvilinear wall surface. The waveguide is supported by a plurality of spaced apart thermally-conductive elements in contact with the curvilinear wall surface allowing sufficient cooling of the waveguide while minimizing the amount of high angle light stripped from the waveguide at points of contact with the contact elements.