Retainer assembly including a tissue thickness compensator

A stapling system for stapling tissue, comprising:

• a cartridge, comprising:
• a deck;
• staple cavities defined in said deck;
• and
• staples removably stored in said staple cavities;
• an anvil configured to deform said staples;
• and
• a buttress, comprising:
• a lattice;
• an array of openings defined in said lattice;
• and
• a medicament in said openings which induces tissue ingrowth into said openings.

A stapling system for stapling tissue, comprising:

• a cartridge body;
• staples removably stored in said cartridge body;
• and
• a buttress, comprising:
• a lattice;
• a pattern of openings defined in said lattice;
• and
• a medicament in said lattice which induces tissue ingrowth within said pattern of openings.

A stapling system for stapling tissue, comprising:

• a cartridge body;
• staples removably stored in said cartridge body;
• and
• an implantable layer, comprising:
• a lattice;
• and
• a medicament which promotes tissue ingrowth into said layer in a specified pattern.