Cortical rim-supporting interbody device and method

An apparatus for forming an intervertebral fusion device comprising:

• first and second guidewires;
• a central distraction device attached to said first and second guidewires;
• a first perimeter balloon assembly including a first perimeter balloon having first concentric guidewire and inflation lumens, the first guidewire lumen extending through an inner diameter of said first perimeter balloon and the first inflation lumen extending from the first perimeter balloon to an external inflation point;
• and
• a second perimeter balloon assembly including a second perimeter balloon having second concentric guidewire and inflation lumens, the second guidewire lumen extending through an inner diameter of said second perimeter balloon and the second inflation lumen extending from the second perimeter balloon to an external inflation point;
• said first guidewire extending through the guidewire lumen of said first perimeter balloon and said second guidewire extending through the guidewire lumen of said second perimeter balloon.