Design Evolution of a DBD Plasma Jet Device for Rapid Wound Healing and Sterilization

Rapid healing and sterilization of chronic wounds will be beneficial to millions of patients (estimated around 5.7 million people in the United States). Plasma-based healing and sterilization techniques are being employed for their effectiveness and ease of operation. Several DBD (Dielectric Barrier Discharge) plasma jet devices are designed and tested by various researchers and are briefly described in our work [NCUR 2020]. Research presented at IntelliScience and SJSU is based on the design of a DBD (Dielectric Barrier Discharge) plasma jet (patent US 9,433,071 B2) to sterilize and improve wound the healing process. This design was developed and tested. Since its development, the plasma jet device design has gone through an evolutionary process. Phase I design incorporated a moving outer electrode that could control the plasma properties by changing its position along with the plasma probe. The movement of the outer electrode during the operation was found difficult and this issue was resolved by improving the first design. Phase II design incorporates three fixed outer electrodes that made the system completely passive. This design was developed and characterized for plasma plume characteristics including its temperature, luminosity, and lengths for various operating conditions (input power and frequency). Spectroscopic signatures of the plasma plume have also been captured for argon and helium plasma jets using an Ocean Optics Spectrometer for various operating conditions. Plasma radicals’ concentration was measured as a function of plasma variables like input power, working gas flow rates, and plasma gas temperatures. Phase III design incorporates shortcomings of above two designs and is developed using quartz with multiple gas entrances. The new design is also completely passive and provides a convenient way of to enhance the presence of reactive nitrogen and oxygen species in the plasma. This design is under progress and only preliminary design aspects are discussed in the poster.