Which instrument is used in the Hasson open technique to access the peritoneal cavity?

• A. Blunt tip trocar
• B. Veress needle
• C. Laparoscope
• D. Endoscope

Answer: (A)

In the Hasson open technique, you gain access to the peritoneal cavity with a blunt-tipped cannula (often called the Hasson cannula) placed through a small incision under direct vision. This blunt instrument acts as the entry port, allowing safe entry and then serving as the conduit for insufflation of CO2 and for the introduction of the laparoscope. The key idea is to open the abdomen and visualize the entry path before entering, reducing the risk of injuring organs. The Veress needle is used in the closed technique, entering blindly to insufflate, which is why it isn’t the instrument used in Hasson access. The laparoscope or endoscope are visualization tools used after access is established, not the instrument that creates the initial peritoneal entry.