Diaphragm entry for posterior surgical access

A method of performing a minimally invasive procedure, the method comprising:

• accessing a diaphragm through a first incision in an abdomen of a patient;
• advancing an access device through the diaphragm into a thoracic cavity of the patient and advancing the access device beyond the diaphragm wherein a distal end of the access device is adjacent to a first organ located within the thoracic cavity and where the distal end separates a second organ from the first organ, where the access device comprises at least one working channel;
• expanding at least one expandable member on an exterior of the access device to form a temporary cavity between the first organ and the second organ;
• positioning a treatment device into the thoracic cavity through the at least one working channel within the temporary cavity and adjacent to the first organ;
• and
• treating an area on the first organ adjacent to the temporary cavity.