Objectives Precision Robotics’ Sirius Robotic Flexible Endoscopic System is a new, fully integrated, compact three-dimensional laparoscopic camera system with a disposable single-use flexible tip that can change its viewing direction. This IDEAL Stage 1 and 2a study assessed its safety, reliability and potential efficacy particularly for single incision laparoscopic surgery and vaginal natural orifice transluminal endoscopic surgery.
Design Prospective single-institution, single-surgeon study.
Setting The study was conducted in a multispecialty hospital.
Participants Women aged 18–70 years scheduled for gynecological laparoscopic surgery were invited to participate. An information sheet and consent was available for the women and an informed consent was obtained. Thirteen participants completed this study.
Interventions The laparoscopic procedures were done in the usual manner. The only difference was the Sirius System was used in place of the conventional laparoscope. All other procedures and instruments remained the same.
Main outcome measures Primary outcome was the proportion of women who successfully completed the intended procedure using the Sirius System without conversion to another camera system, camera users and surgeon’s view and experience, and iterations and modifications to the system. Secondary outcomes were the incidence of intraoperative and postoperative complications during the first 6 weeks following surgery, and duration of surgery.
Results 85% (11/13) of women had their procedure completed successfully using the Sirius System. Two women required immediate conversion to the conventional laparoscope due to technical issues. There were no intraoperative complications. Users agreed that the improved field of view was beneficial for laparoscopic surgery. Iterative improvements were made in the imaging quality, user interface and manufacturing quality.
Conclusions Sirius System has early indications for safety and efficacy for intermediate and major minimally invasive laparoscopic procedures in gynecology. Further studies are needed to confirm it can replace a conventional laparoscope in the surgical workflow.
Trial registration number NCT05048407.
- development study
- device evaluation
- minimally invasive surgical procedures
- natural orifice endoscopic surgery
- obstetrics and gynecology devices
Data availability statement
Data are available upon reasonable request. We would be delighted to share and publish our raw data.
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- development study
- device evaluation
- minimally invasive surgical procedures
- natural orifice endoscopic surgery
- obstetrics and gynecology devices
What is already known about this subject?
Minimally invasive surgery (MIS) in gynecology has progressed from multiport to single incision laparoscopic surgery (SILS) and vaginal natural orifice transluminal endoscopic surgery (vNOTEs).
Conventional laparoscopic camera systems have a limited field of view.
What are the new findings?
Sirius System, an articulated laparoscopic camera system shows early indications of safety and efficacy for MIS laparoscopic procedures in gynecology and can potentially replace a conventional laparoscope in the surgical workflow pending further studies.
How might these results affect future research or surgical practice?
It is hoped that the Sirius System which has an articulated tip with 3 df, enabling C-shaped and S-shaped bending and providing a wider field of view compared with conventional laparoscopes may be particularly advantageous in minimally invasive SILS and vNOTEs procedures.
The next step of clinical testing will be to conduct a prospective cohort IDEAL Stage 2b (Exploration) trial involving multiple surgeons and multiple institutions.
Minimally invasive surgery (MIS) is well established in gynecological surgery. Even for gynecological cancer surgery where overall survival must not be compromised, MIS is the gold standard for certain procedures. MIS laparoscopic total hysterectomy bilateral salpingo-ophorectomy is the preferred surgical management for early-stage carcinoma of the corpus.1 Compared with laparotomy, MIS is associated with reduced morbidity and quicker recovery with no compromise to overall survival.2–5 With advancement in laparoscopic technology and techniques, MIS in gynecology has progressed from multiport to single incision laparoscopic surgery (SILS) and vaginal natural orifice transluminal endoscopic surgery (vNOTEs), thus further reducing morbidity and enhancing recovery.6 7
One of the challenges of MIS is the restriction of the range of surgical movement. This technical challenge is even more pronounced in the transition from multiport to SILS and vNOTEs where instrument crowding is a technical challenge. To overcome these technical challenges, articulated instruments are increasingly being used.8 Conventional laparoscopic camera systems have a limited field of view. Thus articulated camera systems such as the Olympus Endoeye Flex 3D (Olympus Medical Systems Corp) have come to market to address these issues.9
Precision Robotics’ Sirius Robotic Flexible Endoscopic System is a new, fully integrated compact three-dimensional (3D) laparoscopic camera system with a disposable single-use flexible tip that can change its viewing direction.10 The articulated tip has 3 df, enabling C-shaped and S-shaped bending, and providing a wider field of view compared with conventional laparoscopes (figure 1). This wider field of view is of particular advantage for SILS and vNOTEs. Presently available commercial systems do not have the same field of view or df. In addition to the disposable single-use robotic flexible laparoscope, the system is a fully integrated, compact system which consists of a video processor box with an integrated bright white light source, a handle and cable to connect the laparoscope to the video processor box, and a handheld joystick for control.11–14
From September 2019 to July 2020, three animal studies were performed by Precision Robotics in collaboration with National Taiwan University Hospital and Shanghai Ruijin Hospital. Using the Sirius System, expert surgeons successfully conducted the following procedures:
Laparoscopic surgery—performed a cholecystectomy where the gallbladder was removed from an animal model laparoscopically.
Trans-anal surgery—a small tissue sample was removed using an electronic knife to test the system’s performance in a SILS operation with a porcine model.
Orthopedics surgery—conducted a MIS-TLIF (minimally invasive surgery—transforaminal lumbar interbody fusion) operation on an animal cadaver.
Surgeons were able to complete their full surgical workflows using the system, and feedback was incorporated in refining the system’s design.
In addition to animal studies, the system’s safety was demonstrated through extensive testing by qualified testing centers in compliance with electromagnetic compatibility, safety and biocompatibility standards.
These preclinical studies have fulfilled the Pre-IDEAL stage of the IDEAL (Idea, Development, Exploration, Assessment, Long-term follow-up) framework.15–18 The aim of this IDEAL stage 1 and 2a first in-human trial and sequential prospective case series was to assess the safety, reliability and potential efficacy of a new articulated laparoscopic camera system—Precision Robotics’ Sirius Robotic Flexible Endoscopic System in minimally invasive surgery in gynecology particularly for SILS and vNOTEs. The camera operators and surgeon’s experience and view of the Sirius System were assessed. Iterative changes and modifications to improve the Sirius System were described. It was a sequentially reported prospective case series in a single institution, involving a single advanced gynecological laparoscopic surgeon and one team of nurses. It would then form the basis for an IDEAL stage 2b exploration trial involving multiple surgeons and institutions.
This sequentially reported prospective single-institution, single-surgeon study was conducted from 18 May 2021 to 27 July 2021 at Gleneagles Hospital Hong Kong. Institutional Review Board ethical approval was obtained on 17 May 2021. All consecutive patients listed for MIS gynecological surgery by the principal investigator/surgeon fulfilling the study criteria were invited to participate in the study. The trial is registered at ClinicalTrials.gov.
The following baseline patient characteristics were recorded: age, diagnosis, name of surgery and date of surgery. On discharge from hospital, the following data were collected: date of admission, date of discharge, duration of surgery, blood loss, the successful completion of the procedure with the Sirius System without conversion to another camera system, intraoperative and postoperative complications. These data were extracted from the hospital database by the principal investigator/surgeon, and entered into a laptop computer protected by a password accessible only to the principal investigator/surgeon.
Each nurse assisting the procedure and operating the Sirius Endoscope completed a Usability Questionnaire of the Sirius Endoscope System with a 1–5 Likert scale for each question (1=strongly disagree; 2=disagree; 3=neither agree nor disagree; 4=agree; 5=strongly agree), and entered free-text comments (online supplemental material 1). Anonymized video data of the surgical procedure were captured for analysis and validation. The recording were only of the surgical field, and only during the surgical procedure to prevent capturing any personal identifiable details. The video was reviewed for assessing the stability and safety of the procedure, and whether there were any modifications or unexpected changes to the procedure due to the Sirius System. The surgeon’s comments on the efficacy, usability and safety of the Sirius System compared with a conventional laparoscope were recorded. Modifications and improvements to the Sirius System by Precision Robotics, based on feedback from the camera operators and surgeon during the course of the study, were recorded.
All consecutive patients aged 18–70 years listed for gynecological laparoscopic surgery by the principal investigator/surgeon during the duration of the study were invited to participate. An information sheet and consent for the study was available for the patient, and an informed consent was taken by the surgeon. It was emphasized that participation in the study was voluntary, and if they did not consent to the study, it would not affect their subsequent treatment and management. The participants were aware that this was an evaluation of a new endoscope. The safety aspects of the study including the availability of a conventional endoscope for immediate conversion if necessary was emphasized.
Exclusion criteria were pregnancy and/or failure to provide written informed consent for the study.
The study was conducted in Gleneagles Hospital Hong Kong, a multispecialty hospital. Prior to the commencement of the clinical trial, a comprehensive training program for the operating theater nurses on the usage of the Sirius System was conducted by Precision Robotics, and the Gleneagles Hospital Hong Kong Nurse Educator. This involved didactic as well as video and hands-on simulator training from 23 February 2021 to 19 March 2021.
A competency assessment was held from 20 March 2021 to 12 April 2021. This involved an online knowledge assessment, followed by assessment using a competency checklist on the usage of the Sirius System, as well as a simulation assessment on the simulator. In total 63 nurses were trained, and assessed to be competent before commencement of the clinical trial (online supplemental material 2).
The nine nurse assistants involved in this initial study had an average of 10.5 years (range: 5–15 years) of experience in assisting in laparoscopic surgeries. They had all completed the comprehensive training program on the usage of the Sirius System conducted by Precision Robotics and the Gleneagles Hospital Hong Kong Nurse Educator. Subsequently, the video recording of each procedure was reviewed, to ensure that the level of competence expected of the camera operators were achieved, and maintained throughout the study.
The surgeon/principal investigator is an experienced, advanced gynecological laparoscopic surgeon, and gynecological oncologist with more than 20 years of clinical experience in laparoscopic surgery. He is a clinical advisor to Precision Robotics, and has been involved in the final development of the Sirius Endoscope from October 2020. He has been trained in the use of the Sirius Endoscope.
Intervention, procedures and standard care
The laparoscopic procedures were done in the usual manner. The only difference was for the study participants, the Sirius System was used in place of the usual conventional laparoscope. All other procedures and instruments including the number of ports remained the same.
For every procedure using the Sirius System, a conventional laparoscope was on immediate standby, to replace the Sirius System should there be an unanticipated equipment failure, so that the procedure could be completed without delay. Video recordings of each procedure were reviewed to ensure the safety of the Sirius System, and that there were no safety concerns arising from the use of the Sirius System.
Primary outcome was measured by the proportion of women who successfully completed the intended procedure using the Sirius System without conversion to another camera system. The surgeon and nurses’ views of the Sirius System was evaluated by the mean score of the Likert scale questionnaire and free-text comments. Modifications and changes to the Sirius System during the course of the study were recorded as part of the primary outcome measures.
Secondary outcomes were measured by the incidence of intraoperative complications, incidence of postoperative complications during the first 6 weeks following surgery and duration of surgery. Specifically, intraoperative complications directly related to the use of the Sirius System were documented. Duration of surgery was measured in minutes from urinary catheter insertion to closure of vaginal/abdominal wound. Intraoperative or postoperative complications were classified according to the Clavien-Dindo classification during the first 6 weeks of surgery.19
Patient demographics and procedures
A total of 13 consecutive patients were invited and consented to the study. No patient who was eligible was excluded, or declined to participate in the study. The median age was 44 years (range: 30–68 years). Four patients had carcinoma of the uterine corpus. The other nine patients had benign gynecological conditions: three patients had uterine fibroids, four patients had ovarian cysts, one patient had utero-vaginal prolapse and one patient had adenomyosis and endometriosis. Three patients had multiport laparoscopic procedures, eight patients had SILS and two patients had vNOTEs. Eight patients had a hysterectomy. Two patients in addition to hysterectomy had bilateral pelvic lymphadenectomy, as part of their staging procedure for carcinoma of the corpus. One patient had a SILS laparoscopic myomectomy for uterine fibroid. The remaining four patients had ovarian cystectomy. Patient and procedure details are in table 1.
Of the 13 patients entered into the study, 11 (85%) successfully completed their procedure using the Sirius System without conversion to a conventional laparoscope. The Sirius System was not used in Case 1 because during the preoperative checks, a labelling issue was identified in the case packaging for the single-use disposable laparoscope. The sterility of the instrument could not be verified, and therefore the case was not allowed to proceed using the Sirius System. An immediate conversion was done to the usual conventional laparoscope, and the procedure was completed without delay. The issue was resolved by providing additional documentation, and all subsequent batches of instruments from Case 5 onwards were provided with the correct labelling according to hospital standards.
For Case 4, the laparoscopic camera head was found to be defective during the procedure, causing a deterioration in image quality. An immediate conversion to the conventional laparoscope was done for safety reasons, and the procedure was completed without further delay. Investigations showed that the technical issue was due to a manufacturing defect. This was corrected, and the issue did not recur again in subsequent cases. The study was paused for 1 month while this issue was addressed by Precision Robotics.
There were no intraoperative complications. Blood loss was insignificant (<5 mL) in six patients (46%) and 100 mL or less in the remaining seven patients. The median number of days in hospital was 4 days (range: 2–6 days). The median operating time was 75 min (range: 40–162 min).
No patient returned to the operating theater within 24 hours of surgery. At 6 weeks of follow-up, one patient (8%) was re-admitted 14 days after the surgery for vaginal bleeding due to vaginal wound dehiscence requiring resuturing under general anaesthesia. This was classified as a Clavien-Dindo Grade IIIb complication. All patients remained well at 6 weeks after surgery. Details of patient outcome are in table 2.
Surgeon and camera operators’ experience of the Sirius System
Regarding the Usability Questionnaire of the Sirius Endoscope System, the individual questions and mean Likert scale score for each question is detailed in table 3. Comments on the individual cases, and suggestions for improvements were detailed in table 4. The score was above 3 for all questions. The highest scores were for the articulated tip with its 3 df of movement and improved field of view. It was the opinion that this was beneficial for the surgery. The surgeon noted in his comments for Case 6 (table 4) that this improved field of view, without moving the handle of the endoscope was particularly advantageous for SILS and vNOTEs procedures, where instrument clashing is a major technical hurdle for conventional endoscopes.
The lowest scores were for image quality, especially the color brilliance and color rendition. It was felt that the image color was too red compared with conventional endoscopes. Familiarity with the joystick control was also an issue, and improved with progress in the learning curve, and modifications to the graphical user interface from Case 5 onwards.
Iterations and modifications to the Sirius System
The iterations, and modifications to the Sirius System as the case series progressed, and feedback was obtained from the camera operators and surgeon, are detailed in table 4.
Case 1 showed a safety and setup issue, with inadequate labelling of the inner packaging, which did not show an expiry date of the scope. Therefore additional documents were needed to prove the sterility of the instrument, and these were verified by the hospital staff. This issue was resolved with correct labelling of the instruments from Case 5 onwards.
During setup for Case 1, it was also unclear if the connector was correctly connected, and it needed the assistance from a Precision Robotics engineer to verify the connection. This was resolved by incorporating a label indicator to provide a clear visual guide that the connector was correctly connected from Case 5 onwards (figure 2).
The articulated tip with its articulated bending, and wider field of view was helpful to the surgery. However it was noted that there was no indication on the surgical monitor of the position of the articulated tip. This was resolved with a software update and new graphical user interface, whereupon on successful connection of the laparoscope head, a simulated dynamic model would appear on the surgical monitor. This dynamic model provides real-time information on the current position of the articulated tip, and the joystick command status (figure 3).
Image quality and color rendition were issues raised by the surgeon, and he commented that the color of the image was too red. An image setting fix and software update were implemented from Case 5, which allowed the surgeon to choose the image settings and color modes (figure 4). In addition, Precision Robotics is performing detailed analysis on the color outputs of the Sirius System, and of other conventional endoscopic systems, and the results will be used to refine the image processing algorithms.
Manufacturing quality, stability and robustness of the Sirius System was an issue shown in Case 3, 4 and 10. It was noted in Case 3 that while the stated diameter of the endoscope was 10 mm, the actual diameter was measured to be 10.6 mm. This quality control issue was addressed by the manufacturer in later batches of the instruments.
The camera head was found to be defective in Case 4 due to a grounding connection problem during the manufacturing process. All instruments in that batch were recalled, and an investigation was initiated by Precision Robotics. The study was suspended until the new batch of endoscopes were available. Based on the outcome of the investigation, new quality control, test procedures, and test plans were designed. Future endoscopes will need to undergo and pass these tests during the manufacturing process. The grounding connection design is also being reviewed and refined.
An image glitch was noted in Case 10, and subsequent investigations showed that it was due to inadvertent mechanical disconnection of the camera head. The buttons for releasing the camera head could be mistakenly pressed during handling of the endoscope. The mechanical design of the handle is being reviewed to minimize the risk of disconnection by incorporating a two-step lock. Further quality control methods and quality assurance procedures are being designed and will be imposed on the manufacturers of the Sirius System.
This is a first in-human, prospective sequential case series, IDEAL Stage 1 (Idea) and 2a (Development) study involving a single surgeon, in a single institution, with one team of nurses, of Precision Robotics’ Sirius Robotic Flexible Endoscopic System which is a new, fully integrated, compact 3D laparoscopic camera system with a disposable single-use flexible tip that can change its viewing direction. The pre-clinical pre-IDEAL animal trial of the Sirius System, with feedback from surgeons demonstrated the safety of the system for human trial. A comprehensive pre-trial training program starting 3 months before the commencement of the trial was conducted for the operating theater nurses who would be handling the Sirius System, to ensure their competency and confidence in handling the Sirius System. The single surgeon involved in this case series is an experienced, advanced gynecological laparoscopic surgeon. He was involved in the final development of the Sirius System, and had been trained in its use. Video recordings of the procedures were reviewed to ensure that the competency of the team was preserved during the course of the trial, and there were no safety issues related to the use of the Sirius System.
This is an IDEAL Stage 1 and 2a proof of concept, and early development study. The successful completion of 11 of 13 (85%) planned procedures in this sequentially reported, prospective case series, shows that the Sirius System can be used with indications of safety, and efficacy for intermediate and major MIS laparoscopic procedures in gynecology, and can potentially replace a conventional laparoscope in the surgical workflow. Technical issues which were corrected, were responsible for the conversion to conventional laparoscopes in two patients. The majority of the MIS procedures (10/13) were the more technically challenging SILS and vNOTES. There were no intraoperative complications. Blood loss was insignificant in 46% of patients (6/13), and minimal (≤100 mL) in the rest. There was no return to the operating theater within 24 hours in any patient. Most patients in this group including patients with cancer with staging procedures were discharged within 4 days, which is the norm for patients in an Asian setting, where patients elect to stay longer in hospital.20 Only one patient required re-admission for vaginal wound dehiscence, requiring re-suturing 14 days after surgery.
The Sirius System offers two distinct advantages compared with conventional laparoscopes in the surgical workflow. As noted by the surgeon in his comments on the cases (table 4), the single-use disposable laparoscope ensures sterility, and no downtime for sterilization in between cases. The articulated tip with 3 df, enabling C-shaped and S-shaped bending, and providing a wider field of view compared with conventional laparoscopes may be particularly advantageous in minimally invasive SILS, and vNOTEs procedures, where the clashing of instruments is a technical hurdle when using conventional endoscopes. The iterations, and modifications to the Sirius System during this IDEAL Stage 1 and 2a trial, enabled the Sirius System to reach stability for the last two cases. The improvements and modifications were in the areas of imaging quality and color, user interface, manufacturing process, and quality control and testing. There will be ongoing refinements, but no further major modifications are planned.
This IDEAL Stage 1 and 2a trial has shown that the Sirius System can be used with indications of safety, and efficacy in this early stage testing with a single surgeon, in a single institution, with one team of nurses, in a limited number of patients. Further assessment of the Sirius System, with multiple surgeons and nurses, in multiple institutions, with a larger number of patients more representative of the kind of variability expected of the patient population in the healthcare setting, will be needed in a prospective cohort IDEAL Stage 2b (Exploration) trial. There will also need to be more evaluation of learning curves, more outcome measures, reproducibility, and long-term follow-up before the Sirius System can replace conventional endoscopes.
Data availability statement
Data are available upon reasonable request. We would be delighted to share and publish our raw data.
Patient consent for publication
This study involves human participants and was approved by HKU-GHK Institutional Review Board, Registration No: HKU-GHK IRB 2021-01. Participants gave informed consent to participate in the study before taking part.
The management of Gleneagles Hospital Hong Kong for supporting the study, and providing the facilities for training of the operating theater nurses in the Sirius system. Rachel Wong, Assistant Director of Nursing, Operating Theater; Nurse Managers and Nurses of Operating Theater, Gleneagles Hospital Hong Kong for facilitating, and completing training in the Sirius System prior to study accrual. Engineers of Precision Robotics (Hong Kong) for maintenance and support of the Sirius System.
Contributors TYN is the main author, principal investigator/surgeon, design of study, editing of paper, analysis, data storage and processing. SFN participated in design of the study, edited paper, provided academic advice and guidance. TYDK participated in design of study, data analysis, designed and implemented training and assessment program for operating theater nurses for the Sirius System and edited the paper. SYN participated in design of the study, edited paper, data analysis, development and quality control of the Sirius System, participated in training and assessment of operating theater nurses and provided analysis of video images for improvement of the Sirius System. PLBL edited paper, participated in design of study and led development of the Sirius System.
Funding Precision Robotics (Hong Kong) Limited provided the Sirius System, supplied, and funded all the disposable single use articulated flexible endoscopes in the study. Precision Robotics was not involved in the recruitment, or management of patients.
Competing interests TYN is Clinical Advisor to Precision Robotics (Hong Kong) Limited, SYN is employee of Precision Robotics (Hong Kong) Limited, PLBL is employee of Precision Robotics (Hong Kong) Limited.
Provenance and peer review Not commissioned; externally peer reviewed.
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