1. Minimally invasive versus conventional aortic valve operations: a prospective study in 120 patients 
Heinrich E Mächler, MD, Peter Bergmann, MD, Michael Anelli-Monti, MD, Drago Dacar, MD, Peter Rehak, PhD, Igor Knez, MD, Luay Salaymeh, MD, Elisabeth Mahla, MD, Bruno Rigler, MD 
The Annals of Thoracic Surgery 
Volume 67, Issue 4, Pages (April 1999)
DOI: /S (99)

2. Fig 1
Simple equipment is used in minimally invasive aortic valve operations in contrast to the instruments used for endoscopic or endoclamp techniques. The instruments displayed are a pediatric spreader, a cannula for the vent, a venous right-angled cannula, and the arterial cannula.
The Annals of Thoracic Surgery  , DOI: ( /S (99) )