Patent ID: 8172123

Claim:
A surgical stapling head assembly with a rotary cutter, comprising a casing, an annular cutter, a staple driver and a staple holder, the casing is a tubular body comprising a stepped inner cavity and an anti-expansion tube, a plurality of staple pushers are arranged annularly and alternately in two rows, the staple driver is disposed between the anti-expansion tube and an inner wall of the casing, the staple driver is disposed at a proximal end of said staple pushers, the staple holder for receiving one or more surgical staples is disposed at a distal end of the staple driver, the annular cutter is disposed in the space formed by an inner wall of the staple holder, wherein said annular cutter is connected with the staple driver by a bearing structure, the bearing structure at least comprises a bearing inner ring and a bearing outer ring, guiding projections are disposed on said annular cutter or the bearing inner ring or the bearing outer ring, a metal cylinder member with guiding tracks is disposed inside the casing, said guiding projections engage with the guiding tracks so as to guide the annular cutter to move along a helical path.