Tehran University of Medical Sciences Frontiers in Biomedical Technologies 2345-5837 2 4 2015 12 30 200 205 EN Sanaz Hariri Tabrizi Department of Medical Radiation Engineering, Shahid Beheshti University, Tehran, Iran Farah Farzaneh Preventative Gynecology Research Center, Department of Obstetrics and Gynecology, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2015 12 28 2016 05 31 Purpose: This article is dedicated to introduce an Automatic Trocar for LAparoscopic Surgery (ATLAS). The first step in laparoscopic surgery is the port insertion which is known as the most important and potentially dangerous step. An inaccurate Veress needle placement or uncontrolled overshoot of a sharp, blind trocar toward the viscera are the common causes of an unsuccessful procedure. Therefore, a mechatronic device was designed and developed to overcome the shortcomings of the current port insertion techniques. Methods: The system incorporates an automatic insertion apparatus and an automatic stop mechanism to halt the procedure upon reaching the abdominal cavity. A motor was provided to pass the needle through the abdominal layers and a pressure sensor was provided to detect reaching peritoneum and stop the entry mechanism.    Results: The system was tested on an anesthetized canine. ATLAS system stopped upon reaching its peritoneum and avoided injury to intra-abdominal organs. Subsequently, the position of the needle tip was evaluated using another endoscope. Conclusion: The animal test of the system was promising and showed the potential of this system and its improved version in laparoscopic surgeries. https://fbt.tums.ac.ir/index.php/fbt/article/view/65 https://fbt.tums.ac.ir/index.php/fbt/article/download/65/76