referring to fig1 in embodiments where the first portion 90 and second portion 92 are separate chambers each portion 90 92 may be coupled to a separate inflation line 54 a 54 b coupled to the pressure source 52 and controlled by separate valves 56 a 56 b respectively to allow inflation medium to enter and leave the portions 90 92 by selectively opening and closing one or both of the valves 56 a 56 b the diameters of the portions 90 92 may be independently controlled in order to deploy the expandable member 34 according to the methods described hereinbelow referring to fig1 a following insertion of the apparatus 30 into the mitral valve 10 such as is shown in fig8 a the portions 90 and 92 may be inflated such that the diameter of the second portion 92 is substantially greater than that of the first portion 90 the difference in the diameters of the first portion 90 and second portion 92 may be sufficiently large to prevent the expandable member 34 from sliding toward the distal end 40 referring to fig1 b the inflatable member 32 and expandable member 34 may then be drawn in the proximal direction 80 a sufficient distance that the projections 60 of the expandable member 34 penetrate the leaflets 18 a 18 b of the mitral valve 10 the portions 90 and 92 may then be deflated as shown in fig1 c and the inflatable member 32 drawn in the proximal direction 80 leaving the expandable member in the position shown in fig8 f in some instances the second portion 92 can be used to push the projections.