A Rapid and Cost-Effective Device for Testing Minimal Erythema Dose

Area of Science:

• Dermatology
• Photomedicine
• Medical Device Innovation

Background:

• Ultraviolet (UV) light phototherapy is crucial for treating various skin diseases.
• Accurate determination of minimal erythema dose (MED) is essential for effective phototherapy.
• Existing MED testing methods can be time-consuming and costly.

Purpose of the Study:

• To introduce a novel, rapid, and economical device for MED testing.
• To validate the efficacy of the new device in comparison to existing methods.
• To assess the device's applicability across different UV wavelengths.

Main Methods:

• A low-cost device was engineered using plastic sheeting with graded ink density for controlled UV transmission (10%-100%).
• The device features six 10-mm square apertures and a UV-impenetrable sleeve for easy application.
• A pilot study compared the novel device against a commercial windowed device on healthy skin of two subjects.

Main Results:

• The novel device achieved identical MED results to the commercial device.
• MED testing time was reduced from 15 minutes to 3 minutes using the new device.
• The device proved effective for UVA, NB-UVB, and BB-UVB, with a manufacturing cost under $2.

Conclusions:

• The developed MED testing device is quick, accurate, cost-effective, and user-friendly.
• This innovation offers significant advantages over conventional MED testing approaches in busy phototherapy settings.
• The device facilitates efficient patient management and treatment optimization in phototherapy practices.