US Patent 10433848 Circular stapler and staple head assembly thereof

A circular stapler and a staple head assembly thereof are disclosed. The staple head assembly comprises a staple barrel assembly and an anvil assembly. The anvil assembly includes an anvil ring and an anvil shaft which are fixedly connected to each other, where the anvil shaft is capable of sliding along the longitudinal direction in an anti-expansion tube. The staple barrel assembly includes a staple barrel, a staple pusher piece arranged within the staple barrel and a staple cartridge fixed at a distal end of the staple barrel.