J Minim Invasive Surg 2018; 21(3): 112-117  
The da Vinci Xi System in Robotic Gastric Cancer Surgery:  A Comparison with the S System
Chulhyo Jeon, M.D., Ho Seok Seo, M.D., Yoon Ju Jung, M.D., Cho Hyun Park, M.D., Ph.D., Kyo Young Song, M.D., Ph.D.
Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
Correspondence to: Kyo Young Song
Department of Surgery, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, 271 Cheonbo-ro, Uijeongbu 11765, Korea
Tel: +82-31-820-5069 Fax: +82-31-847-2717 E-mail: skygs@catholic.ac.kr, skys9615@gmail.com
Received: May 9, 2018; Revised: June 22, 2018; Accepted: July 3, 2018; Published online: September 15, 2018.
© Journal of Minimally Invasive Surgery. All rights reserved.

cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: The next-generation da Vinci system, the Xi, was introduced in 2015. Its benefits for patients with gastric cancer have not yet been clearly identified. 
Methods: A total of 47 patients who had undergone robot-assisted gastrectomy (RAG) for gastric cancer were analyzed retrospectively. Twenty-six (26) patients had undergone RAG by da Vinci S, and the remaining 21 by da Vinci Xi. These two groups’ clinicopathological characteristics, operative details, and short-term postoperative outcomes were compared. 
Results: The median docking time was significantly shorter in the Xi group (5.0 vs. 3.0 min, respectively, p=0.020). Despite the significantly higher rate of the D2 lymph node dissection in the Xi group (76.2 vs. 34.6%, respectively, p=0.011), the median console time showed no significant difference (57.5 vs. 56.0 min, respectively, p=0.404). None of the other operative details or oncologic results showed any significant differences.
Conclusion: Although the enhanced anatomical access system of the Xi system, clinical outcomes did not be improved, except reducing docking time. Further investigations which can improve clinical outcomes are needed.
Keywords: Gastrectomy, Stomach neoplasms, Robotic surgical procedures


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