Low AC losses in multifilamentary Bi(2223) tapes have been obtained introducing highly resistive, very thin "oxide barriers" based on Ag/BaZrO₃ around each filament. The transverse resistivity between neighbour filaments was enhanced by a factor 8 - 11 with respect to that of purely Ag sheathed tapes. The maximum of the AC coupling losses as a function of the frequency was found to be shifted from about 2.8 Hz for Bi(2223) tapes with pure Ag matrix to 23 Hz for tapes with oxide barriers. The actual jc (77K, 0T) values of tapes with oxide barriers are about 10'000 - 13'000 A/cm², i.e. a factor 2 - 3 lower than for our usual tapes with pure Ag sheath. The optimization of the critical current density is actually under work, taking into account the change in oxygen diffusion.