Power pack for activating surgical instruments and providing user feedback

A surgical fastener applier comprising:

• a) a housing;
• b) first and second jaws;
• c) an elongated shaft extending between the housing and first and second jaws;
• d) a motor powered firing mechanism actuable to fire a plurality of fasteners into tissue positioned between the first and second jaws in a firing mode;
• e) a clamping mechanism actuable to clamp tissue between the first and second jaws in a clamping mode;
• and
• f) a display showing a clamping force on tissue of the first and second jaws, the clamping force detected by a sensor, the clamping force displayed during the clamping stroke;
• and
• g) wherein subsequent to the clamping mode and display of the clamping force, the firing mechanism is actuable to advance a plurality of fasteners from the first jaw into the tissue in the firing mode;
• h) wherein the firing mechanism advances an I-beam with respect to the first jaw distally to fire the plurality of fasteners, wherein movement of the clamping mechanism is independent of distal movement of the I-beam such that movement of the clamping mechanism does not effect movement of the I-beam.