Surgical stapling instrument having a releasable buttress material

A surgical staple cartridge, comprising:

• a cartridge body, comprising:
• a deck comprising a first lateral surface;
• a recess defined in said deck, wherein said recess defines a second lateral surface below said first lateral surface and a recess wall extending between said first lateral surface and said second lateral surface;
• and
• a staple cavity defined in and extending below said second lateral surface, wherein said staple cavity defines a staple cavity wall, wherein said recess wall defines a perimeter of said recess, and wherein said perimeter surrounds said staple cavity;
• a staple removably stored in said staple cavity, wherein said staple comprises a base and deformable members extending from said base;
• a staple driver movably positioned at least partially within said staple cavity;
• and
• a sled movable from an unfired position to a fired position during a staple firing stroke, wherein said sled engages said staple driver during said staple firing stroke to lift said staple toward said deck, wherein at least a portion of said staple cavity wall contacts said staple driver during said staple firing stroke, and wherein at least a portion of said staple cavity wall contacts said deformable members during said staple firing stroke.

A surgical staple cartridge, comprising:

• a cartridge body, comprising:
• a deck;
• a recess defined in said cartridge body, wherein said recess defines a recessed surface and a recess wall extending between said deck and said recessed surface;
• and
• a staple cavity defined in said cartridge body, wherein said staple cavity defines an opening in said recessed surface, wherein said opening is surrounded by said recess wall, and wherein said staple cavity defines a staple cavity wall comprising a proximal portion and a distal portion, and
• a staple ejectable from said staple cavity, wherein said staple comprises a base, a proximal leg, and a distal leg, and wherein said proximal leg is in contact with said proximal portion and said distal leg is in contact with said distal portion when said staple is in said staple cavity.