An atmospheric pressure plasma device with multiple ring electrodes for decontamination of flexible tubing with variable scales

Plasma bacteria decontamination devices for the inner surface of medical tubes have to consider more practical application problems, such as the processing compatibility for medical tubes of variable scales, a reasonable and effective design model for plasma electrode parameters, and so on. This paper proposes a novel multisegment-casing ring-ring jet (MSC-RRJ) without embedding the electrode into the target tube, obtaining the variable tube length processing capability. And through establishing an effective design model based on electric field distribution properties, ensuring the electric field strength margin in each segment of MSC-RRJ to achieve the processing capability of variable tube diameters. A prototype device is developed based on the proposed MSC-RRJ electrode and design method being verified by killing Staphylococcus aureus and Escherichia coli.