The Brush-Shape Device Used to Generate Atmospheric and Homogeneous Plasmas for Biomedical Applications

The brush-shape device mainly consisting of the well-aligned and microns-thick hollow quartz fibers can be used to generate an atmospheric and homogeneous cold plasma jet for biomedical applications. Addition of a trace amount of O-2 into the feed gas greatly altered the electrical properties of the plasma jet, thus had an obvious effect on the sterilization efficiency. The uniformity of the brush-shape plasma jet along its transverse direction was well consistent with the uniform distribution of sterilization efficiency. The atmospheric He plasma jet containing 1% O-2 may kill all the Candida albicans cells with a population of 10(5) spores within an exposure time of 180 s. Analysis indicates that both O radicals and charged species can be an important contributor in this plasma inactivation.