Circular stapling system comprising rotary firing system

An end effector of a surgical stapler, wherein said end effector comprises:

• a cartridge body comprising a longitudinal axis;
• a plurality of staple cavities defined in said cartridge body;
• staples removably stored in said staple cavities;
• and
• a firing member rotatable about said longitudinal axis to sequentially eject said staples from said staple cavities.

An end effector for use with a surgical stapler configured to apply annular rows of staples, said end effector comprising:

• a cartridge body;
• a plurality of staple cavities defined in said cartridge body, comprising:
• a first annular row of staple cavities;
• a second annular row of staple cavities;
• a first group of staples removably stored in said first annular row of staple cavities;
• a second group of staples removably stored in said second annular row of staple cavities;
• a plurality of staple drivers, wherein each said staple driver is configured to eject a said staple from a said staple cavity;
• a drive slot defined along an arcuate path, wherein said arcuate path includes a first portion which extends under said first annular row of staple cavities and a subsequent portion which extends under said second annular row of staple cavities;
• and
• a ramp slideable within said drive slot, wherein said ramp is configured to engage said staple drivers and eject said staples from said staple cavities.