US Patent 10271845 Fastener cartridge assembly comprising a cam and driver arrangement

A surgical stapling assembly comprising an anvil, a firing member, and a replaceable cartridge is disclosed. The replaceable cartridge comprises a longitudinal slot, a first row of staple cavities, a second row of staple cavities, first staples, second staples, staple drivers, and a sled. The sled comprises a plurality of first rails positioned on a first side of the longitudinal slot and a plurality of second rails positioned on a second side of the longitudinal slot. The first rails are configured to lift the drivers toward the anvil to deform the first staples to a first formed height and the second staples to a second formed height. The first formed height is different than the second formed height. At least one first rail of the plurality of first rails comprises a height which is different than the height of another first rail of the plurality of first rails.