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OsseoSpeed, MicroThread, Conical Seal Design, Connective Contour. Urotonic Surface Technology. The surface layer of LoFric catheters has a hydrophilic coating that binds water. The result is a very wet and slippery surface that has a 90-95% lower friction than traditional catheters with gel. The Astra Tech wound drains. Bellovac ABT, filtration and reinfusion of autologous blood.