US Patent 7637925 Surgical staple

A fluidthight surgical staple for a surgical stapling device comprises a deformable back that comprises two parts that are hinged with respect to each other and at least four rows of anchoring pins. The back remains substantially flat when the staple is in place, so that it does not protrude from the wall of the organ; when the back is in the open position, the axes of the pins of the two central rows tend to align parallel to each other and the tips of the pins are separated by a gap larger than in the closed position. At least a second row of converging second anchoring pins is placed towards the outer side of each hinged part of the back. The staple is provided with gripping points for keeping the staple in open or closed position.