A ring access system, for use in system having a plurality of routing platforms coupled by redundant rings, that allows access to either ring when a token is received at a first ring if all outstanding locally-sourced data has been stripped from the second ring. The device also comprises a gate arranged adjacent the channel and a drift zone of a second conductivity type arranged between the body and a bottom contact layer. The vacuum device may be utilized with minimal or no trauma to the target tissue or surrounding tissues.