UV Lamp Filter Unit for Safe Light Therapy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UV light therapy appliances for chronic dermatological disorders often expose patients to high-intensity light, which can be harmful, and lack effective filtering mechanisms for wavelengths below 280 nanometers.
Innovation Solution
A UV lamp and filter unit configuration where the filter unit consists of two parallel plates with increasing transmission from 280 to 320 nanometers, ensuring a maximum intensity of 0.35 W/m² at 40 cm, absorbing wavelengths below 280 nanometers, and utilizing natural convection for cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UV lamp is used for light therapy, then therapeutic effect is improved, but harmful wavelengths below 280 nm may be present causing health damage
Solution Approach 1:
The filter unit is divided into two separate filter plates placed parallel to each other with a gap between them. Each plate is designed to filter specific wavelength ranges, with the first plate blocking wavelengths below 280 nm and the second plate controlling the 280-320 nm range. This segmentation allows precise control over which wavelengths reach the patient while maintaining therapeutic effectiveness.
Solution Approach 2:
The filter unit acts as an intermediary component between the UV lamp and the patient's skin. It selectively transmits beneficial UV wavelengths (280-320 nm) while blocking harmful wavelengths below 280 nm. The filter unit mediates the interaction between the lamp and patient, ensuring only safe and therapeutic light reaches the skin.
2Object-affected harmful factors
If filter plates are used to block harmful wavelengths, then safety is improved, but light intensity in the therapeutic range may be reduced
Solution Approach 1:
Different regions of the spectrum are handled with different filter characteristics. The first filter plate is optimized for blocking wavelengths below 280 nm, while the second filter plate is optimized for controlling the 280-320 nm therapeutic range. This local differentiation ensures that harmful wavelengths are blocked while maintaining adequate intensity in the therapeutic window.
Solution Approach 2:
The filter plates are designed with specific optical parameters - transmission characteristics that vary by wavelength. The first plate has high attenuation for wavelengths <280 nm and high transmission for >280 nm. The second plate provides controlled transmission for the 280-320 nm range. These parameter changes enable selective wavelength control while maintaining therapeutic intensity.
3Reliability
If a single thick filter plate is used, then filtering effectiveness is improved, but cooling capability deteriorates
Solution Approach 1:
Instead of using a single thick filter plate, the filtering function is segmented into two separate plates with a gap between them. This segmentation allows air circulation through the gap, enabling natural convection cooling. Each plate remains thin enough to maintain good thermal contact with the lamp while collectively providing the required filtering effectiveness.
Solution Approach 2:
The gap between the two filter plates creates a natural convection current that circulates air through the filter unit. Warmer air rises through the gap, carrying heat away from the filter plates, while cooler air replaces it. This pneumatic cooling mechanism effectively manages the temperature of the filter unit without requiring external cooling systems.
4Device complexity
If filter plates are placed close together, then device compactness is improved, but natural cooling capability deteriorates
Solution Approach 1:
A small gap is maintained between the filter plates - not large enough to compromise compactness, but sufficient to allow natural convection cooling. This partial action approach balances the conflicting requirements: the gap is small enough to keep the device compact while large enough to enable effective thermal management through air circulation.
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
Provides safe and effective light therapy for chronic dermatological disorders by maintaining low light intensity and preventing harmful wavelengths, while allowing beneficial light in the 280-320 nm range, and incorporating natural cooling through air convection.
Implementation Method 1
a filter unit (3) that filters the light emanating from the UV lamp (1), which filter unit comprises two filter plates (5)
Implementation Method 2
By arranging the filter unit as two interspacedly disposed plates there is a natural cooling by the warm current of air rises up between the plates
Data Source
Figure 1~3
AI summary
A medical appliance intended for light therapy for patients who have a chronic dermatological disorder comprises a UV lamp and a filter unit which filters the light emanating from the UV lamp, which filter unit comprises two interspacedly disposed filter plates. The UV lamp and filter unit are such that in the wavelength range between 280 and 320 nanometers light is present having a maximum intensity of 0.35 W/m2 at a distance of 40 cm from the UV lamp. It has turned out that light in this wavelength range has a positive effect on people who have chronic dermatological disorders, provided that these people are not exposed to such light having a high intensity. The medical appliance according to the invention is a safe appliance for light therapy because of the use of the filter unit, since the light intensity is relatively low and this appliance is suitable for use several times a week for relatively brief periods at a time.