In Video assisted thoracoscopic surgery for better vision, the space in the operative field is created by :
Video Assisted Thoracoscopic Surgery (VATS) In contrast to most laparoscopic techniques, the working space for VATS is created not by adding an insufflating gas but rather by removing air from the ipsilateral lung parenchyma causing of the ipsilateral lung. Used for pulmonary decoication, pleurodesis, and lung or pleural biospies. Ref: Sabiston 20th edition Pgno: 355
Self retaining retractor
CO2 insufflation
Collapse of ipsilateral lung
Rib spacing
Cardio thoracic surgery  