New design of textile light diffusers for photodynamic therapy

Area of Science:

• Biomedical Engineering
• Materials Science
• Dermatology

Background:

• Photodynamic therapy (PDT) requires precise and uniform light delivery for effective clinical outcomes.
• Current light sources often fail to provide homogeneous light distribution due to anatomical complexities.
• Flexible and uniform light delivery systems are needed to improve PDT efficacy.

Purpose of the Study:

• To develop and evaluate a novel textile light diffuser (TLD) for homogeneous light delivery in PDT.
• To assess the feasibility of integrating plastic optical fibers (POF) into textile structures for medical applications.
• To ensure reproducible fluence rates for preventing under- or overtreatment in PDT.

Main Methods:

• Development of a TLD using POF and polyester yarns with a specific satin weave pattern.
• Incorporation of POF macrobending to induce side light emission.
• Coupling POF ends to a 5 W, 635 nm laser diode and evaluating light homogeneity and fluence rate.
• Monitoring temperature changes using an infrared thermographic camera.

Main Results:

• The TLD achieved a fluence rate of 18±2.5 mW/cm² with a 5 W power source.
• The developed satin weave pattern improved light emission homogeneity and corrected intensity decrease along the POF.
• Optical losses were minimal, and temperature elevation was only 0.6 °C after 10 minutes of illumination.
• Prototyped fabrics demonstrated suitability for PDT requirements, with potential for large-scale production.

Conclusions:

• The developed TLD offers a flexible and homogeneous light delivery solution for photodynamic therapy.
• Textile manufacturing processes can be utilized to produce large-area TLDs for various PDT applications.
• This innovation addresses key challenges in light delivery for PDT, enhancing treatment precision and patient outcomes.