Solo surgery in robot-assisted gastrectomy versus laparoscopic gastrectomy for gastric cancer: a propensity score-matched analysis.

BACKGROUND: Robot-assisted gastrectomy (RG) for gastric cancer is still not well standardized. This study aimed to explore the feasibility and effectiveness of solo surgery in robot-assisted gastrectomy (SRG) for gastric cancer compared to laparoscopic gastrectomy (LG). METHODS: This was a single-center retrospective comparative study between SRG and conventional LG. Between April 2015 and December 2022, 510 patients underwent gastrectomy, and data from a prospectively collected database were analyzed. We identified 372 patients who underwent LG (n = 267) and SRG (n = 105) and the remaining 138 patients were excluded because of remnant gastric cancer, esophagogastric junction cancer, open gastrectomy, concurrent surgery for concomitant malignancies, RG before starting SRG, or cases in which the author was unable to perform or supervise gastrectomy. Propensity score matching was performed at a ratio of 1:1 to reduce bias from confounding patient-related variables, and short-term outcomes were compared between the groups. RESULTS: After propensity score matching, 90 pairs of patients who underwent LG and SRG were selected. In the propensity-matched cohort, the operation time was significantly shorter in the SRG group than that in the LG group (SRG = 305.7 ± 74.0 min vs. LG = 340.3 ± 91.65 min, p < 0.0058), less estimated blood loss was observed in the SRG group than that in the LG group (SRG = 25.6 ± 50.6 mL vs. LG = 76.1 ± 104.2 mL, p < 0.0001) and postoperative hospital stay was shorter in the SRG group than that in the LG group (SRG = 7.1 ± 0.8 days vs. LG = 9.1 ± 7.7 days, p = 0.015). CONCLUSION: We found that SRG for gastric cancer was technically feasible and effective with favorable short-term outcomes, including shorter operative time, less estimated blood loss, shorter hospital stays, and lower postoperative morbidity than those in LG.

Efficiency in image-guided robotic and conventional camera steering: a prospective randomized controlled trial.

BACKGROUND: Robotic camera steering systems have been developed to facilitate endoscopic surgery. In this study, a randomized controlled trial was conducted to compare conventional human camera control with the AutoLap™ robotic camera holder in terms of efficiency and user experience when performing routine laparoscopic procedures. Novelty of this system relates to the steering method, which is image based. METHODS: Patients undergoing an elective laparoscopic hemicolectomy, sigmoid resection, fundoplication and cholecystectomy between September 2016 and January 2018 were included. Stratified block randomization was used for group allocation. The primary aim of this study was to compare the efficiency of robotic and human camera control, measured with surgical team size and total operating time. Secondary outcome parameters were number of cleaning moments of the laparoscope and the post-study system usability questionnaire. RESULTS: A total of 100 patients were randomized to have robotic (50) versus human (50) camera control. Baseline characteristics did not differ significantly between groups. In the robotic group, 49/50 (98%) of procedures were carried out without human camera control, reducing the surgical team size from four to three individuals. The median total operative time (60.0 versus 53.0 min, robotic vs. control) was not significantly different, p = 0.122. The questionnaire showed a positive user satisfaction and easy control of the robotic camera holder. CONCLUSION: Image-based robotic camera control can reduce surgical team size and does not result in significant difference in operative time compared to human camera control. Moreover, robotic image-guided camera control was associated with positive user experience.

Comparison of solo surgery to conventional surgery in single-incision laparoscopic myomectomy.

OBJECTIVE: To evaluate the effectiveness of solo surgery in single-incision laparoscopic myomectomy. METHOD: This study entailed a retrospective analysis of medical records. Solo surgery was compared with conventional single-incision laparoscopic myomectomy. Demographic characteristics and surgical outcomes were evaluated between both techniques. RESULTS: A total of 29 women underwent consecutive single-incision laparoscopic myomectomies from July 2020 to December 2020. Nineteen patients who underwent conventional single-incision laparoscopic myomectomy from July to October of 2020 were compared with 10 patients who underwent solo surgery in single-incision laparoscopic myomectomy from November to December 2020. Patients in both groups were similar in age, parity, body mass index, surgical history, size of largest myoma, and type of largest myoma. There were no differences between groups for number of removed myomas, operative time, hemoglobin change, postoperative length of stay, and complications, but there were for adhesiolysis and estimated blood loss. CONCLUSION: Although solo surgery did not significantly shorten operative time in single-incision laparoscopic myomectomy, it has the advantage of not requiring an assistant for suturing and tying.

A Robotic Camera Holder Controlled by Head Movements: Exploring This New Robot-Surgeon Interface.

Background. Most robotic camera steering devices (RCSDs) require active steering by the surgeon and necessarily increase workload. Clinical experience shows that standard laparoscopic procedures can be performed safely as solo surgery aided by RCSDs. No evidence exists concerning exploratory or emergency procedures. We compared the performance during unexpected laparoscopic tasks on surgical simulators aided either by an RCSD controllable by head movements of the surgeon or by a human camera assistant. Methods. Forty-five medical students without previous experience with minimal invasive surgery were randomized in 2 groups, and they performed standard and unexpected laparoscopic tasks requiring complex camera movements on box trainers either using an RCSD or assisted by a human camera assistant. Efficiency and performance parameters were recorded. Results. Performance in simulated standard procedures was equivalent. In simulated exploratory procedures, we saw significantly better performance scores in the conventional group versus the RCSD group. The strongest factor for these differences was the longer camera-adjusting time in the RCSD group versus the conventional group (PEG task = 208 ± 51 seconds vs 170 ± 36 seconds, P = .005; suture task = 563 ± 126 seconds vs 454 ± 201 seconds, P = .041). Conclusion. These results, obtained on surgical simulators, indicate that the solo approach to standard surgical tasks, facilitated by an RCSD controllable by head movements, can most likely be viewed as safe. Exploratory procedures with a relevant chance for complications or procedures that require rapid, often, or complex camera movements should rather be performed with a human camera assistant.

Laparoscopic inguinal hernia repair with a joystick-guided robotic scope holder (Soloassist II®): retrospective comparative study with human assistant.

PURPOSE: The purpose of this study was to evaluate the clinical usefulness of a joystick-guided robotic scope holder (Soloassist II®) in laparoscopic inguinal hernia repair. METHODS: Among 182 inguinal hernia patients treated by laparoscopic transabdominal preperitoneal repair, 82 cases were completed with a human scope assistant, while Soloassist was used in 100 cases. We retrospectively compared perioperative results of Soloassist group and human scope assistant group. In 139 unilateral cases, we also used logistic regression of perioperative factors for the propensity score calculation to balance the bias. RESULTS: All operations with Soloassist were carried out laparoscopically as solo-surgery without any system-specific complications. A statistically significant decrease in operation time was observed in Soloassist group compared with human assistant group (93.6 vs 85.9 min, p = 0.05). There was no prolongation of preoperative time or difference in the amount of intraoperative blood loss. Operation time was also significantly shorter in Soloassist group, when analyzing unilateral cases (85.5 vs 76.3 min, p = 0.02) and bilateral cases (126.9 vs 111.8 min, p = 0.01), independently. However, after propensity score matching in unilateral cases, there was no statistically significant difference between the two groups (83.8 vs 77.2 min, p = 0.23). CONCLUSIONS: The feasibility of Soloassist in laparoscopic inguinal hernia repair was demonstrated with no adverse device-related events. All surgeries could be completed as solo-surgery, while no additional time for preoperative setting was required. The mean operation time tends to be shorter in Soloassist group compared with human assistant group. Soloassist could be an effective device in laparoscopic inguinal hernia repair.

Clinical evaluation of complete solo surgery with the "ViKY®" robotic laparoscope manipulator.

BACKGROUND: Advancement in both surgical technique and medical equipment has enabled solo surgery. ViKY® Endoscope Positioning System (ViKY®) is a robotic system that remotely controls an endoscope and provides direct vision control to the surgeon. Here, we report our experience with ViKY®-assisted solo surgery. METHODS: We retrospectively examined 25 cases of solo surgery TAPP with ViKY®. ViKY® was setup by the surgeon alone, and the setup duration was determined as the time at which the side rail was positioned and that when the endoscope was installed. For assessing the control unit, the number of false movements was counted. We compared the operative results between ViKY®-assisted solo surgery TAPP and the conventional method with an assistant. RESULTS: The average time to set up ViKY® was 7.9 min. The average number of commands for ViKY® during surgery was 98.3, and the average number of errors and no response of control unit was 7.9. The mean duration of surgery was 136 min for the ViKY® group, including the setup time, and 117 min for the conventional method. No case required an assistant during the operation. There was also no difference between the two groups with regard to postoperative complications and the rate of recurrence. CONCLUSIONS: ViKY® proved reliable in recognizing orders with very few failures, and the operations were performed safely and were comparable to the conventional operations with assistants. Solo surgery with ViKY® was beneficial in this clinical evaluation.

A hands-free region-of-interest selection interface for solo surgery with a wide-angle endoscope: preclinical proof of concept.

BACKGROUND: A hands-free region-of-interest (ROI) selection interface is proposed for solo surgery using a wide-angle endoscope. A wide-angle endoscope provides images with a larger field of view than a conventional endoscope. With an appropriate selection interface for a ROI, surgeons can also obtain a detailed local view as if they moved a conventional endoscope in a specific position and direction. METHODS: To manipulate the endoscope without releasing the surgical instrument in hand, a mini-camera is attached to the instrument, and the images taken by the attached camera are analyzed. When a surgeon moves the instrument, the instrument orientation is calculated by an image processing. Surgeons can select the ROI with this instrument movement after switching from 'task mode' to 'selection mode.' The accelerated KAZE algorithm is used to track the features of the camera images once the instrument is moved. Both the wide-angle and detailed local views are displayed simultaneously, and a surgeon can move the local view area by moving the mini-camera attached to the surgical instrument. RESULTS: Local view selection for a solo surgery was performed without releasing the instrument. The accuracy of camera pose estimation was not significantly different between camera resolutions, but it was significantly different between background camera images with different numbers of features (P < 0.01). The success rate of ROI selection diminished as the number of separated regions increased. However, separated regions up to 12 with a region size of 160 × 160 pixels were selected with no failure. Surgical tasks on a phantom model and a cadaver were attempted to verify the feasibility in a clinical environment. CONCLUSIONS: Hands-free endoscope manipulation without releasing the instruments in hand was achieved. The proposed method requires only a small, low-cost camera and an image processing. The technique enables surgeons to perform solo surgeries without a camera assistant.

Solo surgery--early results of robot-assisted three-dimensional laparoscopic hysterectomy.

OBJECTIVE: Report of our initial experience in laparoscopic hysterectomy by a solo surgeon using a robotic camera system with three-dimensional visualisation. MATERIAL AND METHODS: This novel device (Einstein Vision®, B. Braun, Aesculap AG, Tuttlingen, Germany) (EV) was used for laparoscopic supracervical hysterectomy (LASH) performed by one surgeon. Demographic data, clinical and surgical parameters were evaluated. Our first 22 cases, performed between June and November 2012, were compared with a cohort of 22 age-matched controls who underwent two-dimensional LASH performed by the same surgeon with a second surgeon assisting. RESULTS: Compared to standard two-dimensional laparoscopic hysterectomy, there were no significant differences regarding duration of surgery, hospital stay, blood loss or incidence of complications. The number of trocars used was significantly higher in the control group (p <.0001). All hysterectomies in the treatment group were performed without assistance of a second physician. CONCLUSION: Robot-assisted solo surgery laparoscopic hysterectomy is a feasible and safe procedure. Duration of surgery, hospital stay, blood loss, and complication rates are comparable to a conventional laparoscopic hysterectomy.

Feasibility of Solo Single-Incision Laparoscopic Surgery in Non-anatomical Minor Liver Resection: a Propensity Score-Matched Analysis.

BACKGROUND: We introduced solo surgery using a laparoscopic scope holder to wide an operator's activity range and reduce instrument crowding and clashing in single incisional surgery. This study aimed to compare the surgical outcomes of solo single-incision laparoscopic surgery (SILS) and conventional multiport laparoscopic surgery (MULS) for hepatocellular carcinoma (HCC). METHODS: Among 477 consecutive patients between January 2004 and December 2017, 214 patients were included. To overcome selection bias, we performed 1:1 match using propensity score matching between SILS and MULS. Baseline characteristics, operative outcomes, and postoperative complications were compared. RESULTS: No significant differences in baseline characteristics and pathologic features were found between the two groups. Operation time, estimated blood loss, and postoperative major complication were not significantly different (119.0 min vs 141.6 min, p = 0.275; 200.0 mL min vs 373.3 min, p = 0.222; 0 vs 0, p = 1.000). However, postoperative hospital stay was significantly shorter in SILS (2.73 days vs 7.67 days, p = 0.005). CONCLUSIONS: Solo SILS had comparable postoperative complications and feasibility in the aspect of operation time and hospital stay compared with conventional MULS for a favorable located single HCC.

Clinical Desire for an Artificial Intelligence-Based Surgical Assistant System: Electronic Survey-Based Study.

BACKGROUND: Techniques utilizing artificial intelligence (AI) are rapidly growing in medical research and development, especially in the operating room. However, the application of AI in the operating room has been limited to small tasks or software, such as clinical decision systems. It still largely depends on human resources and technology involving the surgeons' hands. Therefore, we conceptualized AI-based solo surgery (AISS) defined as laparoscopic surgery conducted by only one surgeon with support from an AI-based surgical assistant system, and we performed an electronic survey on the clinical desire for such a system. OBJECTIVE: This study aimed to evaluate the experiences of surgeons who have performed laparoscopic surgery, the limitations of conventional laparoscopic surgical systems, and the desire for an AI-based surgical assistant system for AISS. METHODS: We performed an online survey for gynecologists, urologists, and general surgeons from June to August 2017. The questionnaire consisted of six items about experience, two about limitations, and five about the clinical desire for an AI-based surgical assistant system for AISS. RESULTS: A total of 508 surgeons who have performed laparoscopic surgery responded to the survey. Most of the surgeons needed two or more assistants during laparoscopic surgery, and the rate was higher among gynecologists (251/278, 90.3%) than among general surgeons (123/173, 71.1%) and urologists (35/57, 61.4%). The majority of responders answered that the skillfulness of surgical assistants was "very important" or "important." The most uncomfortable aspect of laparoscopic surgery was unskilled movement of the camera (431/508, 84.8%) and instruments (303/508, 59.6%). About 40% (199/508, 39.1%) of responders answered that the AI-based surgical assistant system could substitute 41%-60% of the current workforce, and 83.3% (423/508) showed willingness to buy the system. Furthermore, the most reasonable price was US $30,000-50,000. CONCLUSIONS: Surgeons who perform laparoscopic surgery may feel discomfort with the conventional laparoscopic surgical system in terms of assistant skillfulness, and they may think that the skillfulness of surgical assistants is essential. They desire to alleviate present inconveniences with the conventional laparoscopic surgical system and to perform a safe and comfortable operation by using an AI-based surgical assistant system for AISS.

A novel hybrid 3D endoscope zooming and repositioning system: Design and feasibility study.

BACKGROUND: Manipulation of the endoscope during minimally invasive surgery is a major source of inconvenience and discomfort. This report elucidates the architecture of a novel one-hand controlled endoscope positioning device and presents a practicability evaluation. METHODS AND MATERIALS: Setup time and total surgery time, number and duration of the manipulations, side effects of three-dimensional (3D) imaging, and ergonomic complaints were assessed by three surgeons during cadaveric and in vivo porcine trials. RESULTS: Setup was accomplished in an average (SD) of 230 (120) seconds. The manipulation time was 3.87 (1.77) seconds for angular movements and 0.83 (0.24) seconds for zooming, with an average (SD) of 30.5 (16.3) manipulations per procedure. No side effects of 3D imaging or ergonomic complaints were reported. CONCLUSIONS: The integration of an active zoom into a passive endoscope holder delivers a convenient synergy between a human and a machine-controlled holding device. It is shown to be safe, simple, and intuitive to use and allows unrestrained autonomic control of the endoscope by the surgeon.

Solo single-incision laparoscopic cholecystectomy: a safe substitute for conventional laparoscopic cholecystectomy.

BACKGROUND: Despite the incremental application of single-incision laparoscopic cholecystectomy (SILC), this procedure has technical difficulties, including physical disturbance and an unstable surgical view through the small incision; therefore, we introduce the solo SILC (S-SILC) technique using a laparoscopic scope holder, as a simple, fixed and easy-to-perform procedure for an unassisted surgeon. METHODS: We performed a comparative analysis of S-SILC (n = 566) and conventional three-incision laparoscopic cholecystectomy (n = 874) performed from January 2013 to December 2016 at multiple centres. RESULTS: There was no significant difference of operative time between the two groups (P = 0.176); however, S-SILC showed a higher incidence of intraoperative gallbladder perforation, especially in the initial period (17.0% versus 2.3%, P < 0.001); and shorter post-operative hospital stay (3.3 ± 1.7 versus 1.9 ± 2.7 days, P < 0.001) than conventional three-incision laparoscopic cholecystectomy. There were no significant differences in major post-operative complications between the two groups (P = 0.909) and operation type (P = 0.971) was not a significant risk factor for major post-operative complications in multivariate analysis. CONCLUSION: S-SILC is a feasible and safe procedure; however, careful selection of surgical candidates is necessary in the early period of the experience with this method.

Solo-Surgeon Single-Port Laparoscopic Anterior Resection for Sigmoid Colon Cancer: Comparative Study.

BACKGROUND: To report our experience with solo-surgeon, single-port laparoscopic anterior resection (solo SPAR) for sigmoid colon cancer. MATERIALS AND METHODS: Data from sigmoid colon cancer patients who underwent anterior resections (ARs) using the single-port, solo surgery technique (n = 31) or the conventional single-port laparoscopic technique (n = 45), between January 2011 and July 2016, were retrospectively analyzed. In the solo surgeries, making the transumbilical incision into the peritoneal cavity was facilitated through the use of a self-retaining retractor system. After establishing a single port through the umbilicus, an adjustable mechanical camera holder replaced the human scope assistant. Patient and tumor characteristics and operative, pathologic, and postoperative outcomes were compared. RESULTS: The operative times and estimated blood losses were similar for the patients in both treatment groups. In addition, most of the postoperative variables were comparable between the two groups, including postoperative complications and hospital stays. In the solo SPAR group, comparable lymph nodes were attained, and sufficient proximal and distal cut margins were obtained. The difference in the proximal cut margin significantly favored the solo SPAR, compared with the conventional AR group (P = .000). CONCLUSION: This study shows that solo SPAR, using a passive camera system, is safe and feasible for use in sigmoid colon cancer surgery, if performed by an experienced laparoscopic surgeon. In addition to reducing the need for a surgical assistant, the oncologic requirements, including adequate margins and sufficient lymph node harvesting, could be fulfilled. Further evaluations, including prospective randomized studies, are warranted.

Solo-Surgeon Retroauricular Approach Endoscopic Thyroidectomy.

BACKGROUND: This study aimed to evaluate the feasibility and efficacy of solo-surgeon retroauricular thyroidectomy. MATERIALS AND METHODS: For solo-surgery, we used an Endoeye Flex Laparo-Thoraco Videoscope (Olympus America, Inc.). A Vitom Karl Storz holding system (Karl Storz GmbH & Co.) composed of several bars connected by a ball-joint system was used for fixation of endoscope. A snake retractor and a brain-spoon retractor were used on the sternocleidomastoid. RESULTS: Endoscopic thyroidectomy using the solo-surgeon technique was performed in 10 patients having papillary thyroid carcinoma. The mean patient age was 36.0 ± 11.1 years, and all patients were female. There were no postoperative complications such as vocal cord paralysis and hematoma. When compared with the operating times and volume of drainage of a control group of 100 patients who underwent surgery through the conventional retroauricular approach between May 2013 and December 2015, the operating times and volume of drainage were not significantly different (P = .781 and .541, respectively). CONCLUSION: Solo-surgeon retroauricular thyroidectomy is safe and feasible when performed by a surgeon competent in endoscopic thyroidectomy.

Solo Single-Incision Laparoscopic Resectional Roux-en-Y Gastric Bypass for Morbid Obesity with Metabolic Syndrome.

With the advancement of laparoscopic devices and surgical technology, the era of minimal invasive surgery has progressed to reduced-port surgery, and finally to single-incision laparoscopic surgery (SILS). Several reports show successful application of SILS to various types of bariatric surgery. Oftentimes, this requires a skilled and experienced scopist to perform the procedure. To overcome the technical difficulties of single-incision Roux-en-Y gastric bypass, a manual scope holder was used instead of an assistant scopist, greatly stabilizing the field of view. This allows the surgery to be performed at any time without being influenced by the need of a highly experienced scopist. In this report, we describe in detail the world's first solo single-incision laparoscopic resectional Roux-en-Y gastric bypass.

Laparoscopic Cholecystectomy with Freehand Laparoscopic Camera Controller.

INTRODUCTION: Free hand laparoscopic camera controller (FHLCC) is a new innovative robotic device that has been recently implemented and adopted in laparoscopic surgery, providing the surgeon more comfort in carrying out his surgical skills without the difficulties related to the mutual understanding of the movements of the camera. CASE PRESENTATION: We report the first case of laparoscopic cholecystectomy performed in our hospital with the aid of the free hand laparoscopic camera controller. CONCLUSION: Free hand laparoscopic camera controller provides the surgeon comfort in carrying out his surgical skills without the difficulties related to the mutual understanding of the movements of the camera. It combines the benefits of minimally invasive and robotic assisted surgery, increases efficiencies and improves patient recovery times.

Technical and instrumental prerequisites for single-port laparoscopic solo surgery: state of art.

With the aid of advanced surgical techniques and instruments, single-port laparoscopic surgery (SPLS) can be accomplished with just two surgical members: an operator and a camera assistant. Under these circumstances, the reasonable replacement of a human camera assistant by a mechanical camera holder has resulted in a new surgical procedure termed single-port solo surgery (SPSS). In SPSS, the fixation and coordinated movement of a camera held by mechanical devices provides fixed and stable operative images that are under the control of the operator. Therefore, SPSS primarily benefits from the provision of the operator's eye-to-hand coordination. Because SPSS is an intuitive modification of SPLS, the indications for SPSS are the same as those for SPLS. Though SPSS necessitates more actions than the surgery with a human assistant, these difficulties seem to be easily overcome by the greater provision of static operative images and the need for less lens cleaning and repositioning of the camera. When the operation is expected to be difficult and demanding, the SPSS process could be assisted by the addition of another instrument holder besides the camera holder.

Solo Intracorporeal Esophagojejunostomy Reconstruction Using a Laparoscopic Scope Holder in Single-Port Laparoscopic Total Gastrectomy for Early Gastric Cancer.

Single-incision laparoscopic total gastrectomy for gastric cancer has recently been reported by Seoul National University Bundang Hospital. However, this is not a popular procedure primarily because of the technical difficulties involved in achieving consistent intracorporeal esophagojejunostomy. At Seoul National University Bundang Hospital, we recently introduced a simple, easy-to-use, low-profile laparoscopic manual scope holder that enables the maintenance of a stable field of view, the most demanding condition in single-port gastrectomy. In this technical report, we describe in detail the world's first solo single-incision laparoscopic total gastrectomy with D1+ lymph node dissection and intracorporeal esophagojejunostomy for proximal early gastric cancer.

Novel approach of single-port laparoscopic appendectomy as a solo surgery: A prospective cohort study.

BACKGROUND: Recent advances in medical equipment and surgical techniques have enabled solo surgery, wherein a surgeon operates alone without the participation of other surgical members. However, the application of solo surgery in single-port laparoscopic surgery (SPLS) has been rarely reported. METHODS: Prospectively collected databases of 60 patients who underwent solo-SPLS for appendicitis between March 2013 and June 2014 were retrospectively reviewed. Making a transumbilical incision into the peritoneal cavity was facilitated by using a Lone Star self-retaining retractor. After the establishment of a single port through the umbilicus, we installed a mechanical adjustable camera holder (Endoworld®LAP53 Holding Systems). It was anchored to the operating table rail and firmly held the laparoscope with a possibility to adjust the same as required by the operator. The operative method was identical to the SPLS appendectomy, except for the use of these instruments. RESULTS: The median operation time was 50 min (25-120). None of the patients required open conversion, insertion of an additional port or help of a human assistant. The median length of hospital stay for all patients was 1.0 day (range: 1-3 days). The median dosage of required intravenous analgesics (ketorolac, 0.1 mg/kg of body weight) was 0.0 ampoule (0-4). The median interval to initiation of solid diet was 1 day (1-2). The incidence of postoperative complications was 8.3% (5/60). CONCLUSIONS: Our results shows that solo-SPLS appendectomy could be performed without increasing operation time or postoperative complications when performed by a surgeon competent in performing SPLS appendectomy.