Fasteners and fastener delivery devices for affixing sheet-like materials to bone or tissue

A fastener for fastening a sheet-like implant to tissue, comprising:

• a first trunk having a proximal end and a distal end, a second trunk having a proximal end and a distal end, and a bridge having a first end abutting the proximal end of the first trunk and a second end abutting the proximal end of the second trunk such that the bridge extends from the proximal end of the first trunk to the proximal end of the second trunk;
• the first trunk including a wall having an inner surface defining a lumen extending along a longitudinal axis, the wall defining an aperture fluidly communicating with the lumen, the aperture being defined by one or more edge surfaces of the wall, the one or more edge surfaces including a proximal aperture edge and a distal aperture edge;
• a first claw at least partially disposed within the lumen of the first trunk, the first claw configured for actuation between a delivery position and a deployed position in which a distal portion of the first claw extends in a direction transverse to the longitudinal axis of the first trunk to retain the first trunk in the tissue;
• a first pull member slidably disposed in the lumen of the first trunk, the first pull member and the first claw engaging each other to form a connection, the connection being configured such that a proximally directed force applied to the first pull member is transferred to the first claw to urge movement of the first claw between the delivery position and the deployed position;
• the first claw including a body having an upper surface opposite a lower surface, the body defining a curvilinear axis extending between first and second ends of the body, the upper surface of the body engaging the proximal aperture edge of the wall so that the upper surface slides along the proximal aperture edge as the first claw moves between the delivery position and the deployed position;
• the upper surface and the lower surface being separated by a height of the body, the height varying along the curvilinear axis such that, when the first claw reaches the deployed position, an intermediate portion of the first claw becomes wedged between the proximal aperture edge and the distal aperture edge forming an interference fit with the upper surface of the body contacting the proximal aperture edge and the lower surface of the body contacting the distal aperture edge.