Devices, systems, and methods for forming an opening between body lumens

A system for forming an opening between body lumens, comprising:

• a catheter having a delivery filament;
• a first access element deployable from a distal end of the catheter;
• and
• a second access element deployable from about the distal end of the catheter and comprising a magnetic material, the second access element having a diameter that substantially matches a diameter of the first access element.

A method of forming an opening between tissue of a first body lumen and a second body lumen, comprising:

• delivering a first access element into the first body lumen;
• delivering a second access element comprising a magnetic material into the second body lumen;
• orienting the second access element such that it magnetically attracts the first access element across the tissue of the first body lumen and the second body lumen;
• and
• axially aligned the first and second access elements such that necrosis of the tissue between the first access element and second access element forms the opening between the first and second body lumens.