Endoscopic cardiac surgery, also known as closed cardiac surgery, is a minimally invasive technique. In other words, this technique causes minimal damage on tissues. Through small incisions, special devices are used to access the operation area. An endoscopic camera is used to monitor the area to be operated. Designed to maximize the success of the treatment, these endoscopic devices assist the surgeon to perform the operation comfortably. In addition, minimizing the damage on the tissues, the devices shorten the healing period significantly, compared to open surgery. However, in order to have an endoscopic surgery, the thoracic wall and heart anatomy of the patient must be suitable for this technique.