A compression-self-adjusting staple (20, 30, 40, 50, 60, 70, 80, 90, 100, 110), comprising: a substantially U-shaped staple (20, 30, 40, 50, 60, 70, 80, 90, 100, 110) having: abridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111); two legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112) extending from the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) at an angle thereto; and a compression device (23, 23, 43, 53, 63, 73, 83, 93, 103, 113): at least partly disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and having a bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) characterized in that the bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) comprises: a compression surface movably disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and a compression resistor: connected to the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) and to the compression surface; and formed into a plurality of bends that resist movement of the compression surface towards the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) with a pre-set compressive force. abridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111); two legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112) extending from the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) at an angle thereto; and a compression device (23, 23, 43, 53, 63, 73, 83, 93, 103, 113): at least partly disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and having a bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) characterized in that the bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) comprises: a compression surface movably disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and a compression resistor: connected to the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) and to the compression surface; and formed into a plurality of bends that resist movement of the compression surface towards the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) with a pre-set compressive force. at least partly disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and having a bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) characterized in that the bias portion (25, 34, 44, 54, 64, 74, 84, 94, 104, 114) comprises: a compression surface movably disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and a compression resistor: connected to the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) and to the compression surface; and formed into a plurality of bends that resist movement of the compression surface towards the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) with a pre-set compressive force. a compression surface movably disposed between the legs (26, 32, 42, 52, 62, 72, 82, 92, 102, 112); and a compression resistor: connected to the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) and to the compression surface; and formed into a plurality of bends that resist movement of the compression surface towards the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) with a pre-set compressive force. connected to the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) and to the compression surface; and formed into a plurality of bends that resist movement of the compression surface towards the bridge (21, 31, 41, 51, 61, 71, 81, 91, 101, 111) with a pre-set compressive force.