Implantable layers for a surgical instrument

A staple cartridge, comprising:

• a cartridge body comprising a plurality of staple cavities;
• a plurality of staples removably positioned in said staple cavities;
• a dissolvable web;
• and
• a porous implantable layer, comprising:
• a plurality of pores;
• an inner portion;
• an outer portion positioned at least partially around said inner portion, wherein said plurality of pores is embedded within said inner portion and said outer portion;
• and
• a plurality of passages formed through said outer portion toward said inner portion once said dissolvable web dissolves, wherein said plurality of passages transect at least one pore within said porous implantable layer, wherein some of said plurality of passages are formed before a placement of said porous implantable layer, and wherein some of said plurality of passages are formed after the placement of said porous implantable layer.

A staple cartridge, comprising:

• a cartridge body comprising a plurality of staple cavities;
• a plurality of staples removably positioned in said staple cavities;
• a dissolvable insert;
• and
• a porous implantable layer, comprising:
• a plurality of pores;
• an inner portion;
• an outer portion positioned at least partially around said inner portion, wherein said plurality of pores is embedded within said inner portion and said outer portion;
• and
• a plurality of tissue ingrowth passages formed through said outer portion and said inner portion as said dissolvable insert dissolves, wherein said tissue ingrowth passages are configured to intersect said plurality of pores, wherein some of said tissue ingrowth passages are formed before an implantation of said porous implantable layer, and wherein some of said plurality of passages are formed after the implantation of said porous implantable layer.

A staple cartridge for use with a surgical stapler, comprising:

• a cartridge body comprising a plurality of staple cavities;
• a plurality of staples removably positioned in said staple cavities;
• a dissolvable mold;
• and
• a porous implantable layer, comprising:
• a plurality of pores;
• an inner portion;
• an outer portion positioned at least partially around said inner portion, wherein said plurality of pores is embedded within said inner portion and said outer portion;
• and
• a plurality of passages formed through said outer portion toward said inner portion by said dissolvable mold as said dissolvable mold dissolves, wherein at least one of said plurality of passages is configured to be compressed during a firing motion of the surgical stapler and is configured to surround said plurality of pores of said porous implantable layer during said firing motion, wherein some of said plurality of passages are formed before a placement of said porous implantable layer, and wherein some of said plurality of passages are formed after the placement of said porous implantable layer.