A compression-self-adjusting staple (20) includes a substantially U-shaped staple body and a compression device (23). The staple body has a bridge (21) and two legs (26) extending from the bridge at an angle thereto. Each of the legs has a base end integral with the bridge and a deformable distal end defining a stapling point shaped to pierce material to be stapled. The compression device is at least partly disposed between the legs and has a bias portion (25) with a compression surface movably disposed between the legs and a compression resistor connected to the bridge and to the compression surface and formed to resist movement of the compression surface towards the bridge with a force.
