Surgical end effectors with positive jaw opening arrangements

A surgical instrument, comprising:

• a surgical end effector comprising:
• a first jaw;
• and
• a second jaw pivotally supported on said first jaw for selective movement relative thereto between an open position and closed positions, said second jaw comprising first and second cam surfaces and wherein said surgical instrument further comprises an end effector closure sleeve comprising:
• a first opening cam extending laterally inwardly from said end effector closure sleeve through a portion of said first jaw to operably engage said first cam surface;
• and
• a second opening cam extending laterally inwardly from said end effector closure sleeve through another portion of said first jaw to operably engage said second cam surface such that upon application of an opening motion to said end effector closure sleeve, said first opening cam movably engages said first cam surface and said second opening cam movably engages said second cam surface to move said second jaw to said open positions and upon application of a closing motion to said end effector closure sleeve, said end effector closure sleeve movably engages said second jaw to move said second jaw to one of said closed positions.

A surgical instrument, comprising:

• a housing;
• a closure system operably supported by said housing and configured to generate closing and opening motions;
• an elongate shaft assembly operably interfacing with said housing, said elongate shaft assembly comprising an end effector closure sleeve axially movable in response to applications of said closing and opening motions thereto;
• a surgical end effector comprising:
• an elongate channel operably interfacing with said elongate shaft assembly and configured to operably support a surgical staple cartridge therein;
• and
• an anvil movably supported on said elongate channel for selective movement relative thereto between an open position and closed positions and wherein said surgical instrument further comprises:
• at least two opening cams protruding from said end effector closure sleeve such that upon application of said opening motion to said end effector closure sleeve, said at least two opening cams operably interface with corresponding cam surfaces on said anvil in a first direction to move said anvil to said open position and upon application of said closing motion to said end effector closure sleeve, said end effector closure sleeve operably interfaces with said anvil in a second direction to cause said anvil to move to one of said closed positions.