Final answer:
In minimally invasive laparoscopic surgery using the open method, trocars are used as the speciality supply to provide an entry point for surgical instruments and the laparoscope.
Step-by-step explanation:
When performing minimally invasive surgery such as laparoscopy using the open method, the speciality supply used is a trocar. A trocar is a medical device that is inserted through the abdomen during laparoscopic surgery. It acts as a portal for the insertion of other surgical instruments, including the laparoscope, which is a specialized telescope-like instrument equipped with a light and camera. The laparoscope allows surgeons to view the internal organs on a screen without making a large incision. Although sutures, gauze, and laparoscopes are also used in surgical procedures, it is the trocar that is specifically associated with creating the initial access point in open (Hasson) laparoscopic techniques.