Transvaginal NOTES with semi-rigid and rigid endoscopes that allow adjustable viewing angles

An Actuated Variable-View Rigid Scope System to Assist Visualization in Diagnostic Procedures

OBJECTIVE

Variable-view rigid scopes offer advantages compared to traditional angled laparoscopes for examining a diagnostic site. However, altering the scope's view requires a high level of dexterity and understanding of spatial orientation. This requires an intuitive mechanism to allow an operator to easily understand the anatomical surroundings and smoothly adjust the scope's focus during diagnosis. To address this challenge, the objective of this work is to develop a mechanized arm that assists in visualization using variable-view rigid scopes during diagnostic procedures.

METHODS

A system with a mechanized arm to maneuver a variable-view rigid scope (EndoCAMeleon - Karl Storz) was developed. A user study was conducted to assess the ability of the proposed mechanized arm for diagnosis in a preclinical navigation task and a simulated cystoscopy procedure.

RESULTS

The mechanized arm performed significantly better than direct maneuvering of the rigid scope. In the preclinical navigation task, it reduced the percentage of time the scope's focus shifted outside a predefined track. Similarly, for simulated cystoscopy procedure, it reduced the duration and the perceived workload.

CONCLUSION

The proposed mechanized arm enhances the operator's ability to accurately maneuver a variable-view rigid scope and reduces the effort in performing diagnostic procedures.Clinical and Translational Impact Statement: The preclinical research introduces a mechanized arm to intuitively maneuver a variable-view rigid scope during diagnostic procedures, while minimizing the mental and physical workload to the operator.

Diagnosing and Treating Infertility via Transvaginal Natural Orifice Transluminal Endoscopic Surgery versus Laparoendoscopic Single-Site Surgery: A Retrospective Study

OBJECTIVE

To evaluate the efficacy and safety of transvaginal natural orifice transluminal endoscopic surgery (vNOTES) in the treatment of female infertility.

MATERIALS AND METHODS

This study includes 174 female patients with a history of long-standing female infertility. We retrospectively reviewed 41 patients who underwent hysterolaparoscopy (HL) via transvaginal natural orifice transluminal endoscopic surgery (vNOTES) and 133 patients who underwent laparoendoscopic single-site surgery (LESS). Demographic data, operation records, and pregnancy outcomes were collected and analyzed. The deadline for postoperative follow-up was June 2022. All the included patients were followed up for at least 18 months after surgery.

RESULTS

Compared with the LESS group, the vNOTES group had a shorter postoperative bowel movement time and less pain at 4 and 12 h (p = 0.004 vs. 0.008); no differences were found in other perioperative indicators. The clinical pregnancy rates of the vNOTES and LESS groups were 87.80% and 74.43% (p = 0.073), respectively.

CONCLUSIONS

vNOTES represents a new, less invasive approach for infertility diagnosis and treatment that is particularly suitable for women who have special esthetic requirements. vNOTES is safe and practical and may be an ideal choice for scarless infertility surgery.

Review of transvaginal natural orifice transluminal endoscopic surgery in gynecology

Recent technologic advances in endoscopic instrumentation and optics have allowed the development of a less invasive alternative to conventional laparoscopic surgery. During the past decade, natural orifice transluminal endoscopic surgery (NOTES) flourished in the field of general surgery, and it has emerged as a new concept of minimally invasive surgery. NOTES yields access to the abdominal cavity without any incisions on the abdominal wall (scarless surgery), and the natural orifices of the body surface, such as the mouth and the vagina, serve as the gateway to the peritoneal cavity. In gynecology, the vagina of a woman can be considered as an additional route for surgery. Recently, clinical application of transvaginal NOTES has broadened significantly in gynecology. Using transvaginal NOTES by applying the method of single-incision laparoscopic surgery via the vaginal route, not only adnexal surgery and hysterectomy, but also myomectomy and oncologic surgery could be performed safely and effectively in selected patients. In future, further studies should be conducted to evaluate the true clinical feasibility and safety of transvaginal NOTES.

Rigid, Variable-View Endoscope in Neurosurgery

Introduction. The endoscope became a highly valued visualization tool in neurosurgery. However, technical limitations caused by the rigidity of current standard endoscopes significantly decrease ergonomy in transcranial neurosurgery. Further technological developments will aid enlarging the surgical applicability. Objective. To evaluate the intraoperative features of a rigid variable-view endoscope in neurosurgery. Methods. We assessed a 4 mm rigid rod lens endoscope (EndoCAMeleon, Karl Storz, Tuttlingen, Germany) in the intraoperative setting. The device offers a variable angle of view from 15° to 90° in one plane. The endoscope was used in 3 cases (aneurysm clipping, vestibular schwannoma surgery, endoscopic third ventriculostomy) for inspection. Results. Direct insertion of the device through the craniotomy/burr hole with the lowest angled view (15°) was always possible. Neurovascular structures crossing the access route could be visualized and avoided. This allowed a targeted positioning of the endoscope’s tip in the operating field. Once the target point was reached, viewing direction was changed in one plane from 15° to 90° according to anatomic demands. As the endoscope’s tip does not move while the lens is rotated, surrounding neurovascular structures are not at risk to be injured. However, turning of the lens-controlling wheel in proximity to delicate structures may be inconvenient. Conclusion. The rigid, variable-view endoscope has the potential to become an appreciated visualization tool in neuroendoscopy. The steerable lens enables a tremendous expansion of the visual field, resulting in higher efficiency for surgeons and increased safety for patients.

Transvaginal natural-orifice transluminal endoscopic surgery (NOTES) in adnexal procedures

From August 2010 to June 2011, 10 consecutive patients underwent transvaginal NOTES of the adnexa, including tubal sterilization in 3, salpingectomy because of ectopic pregnancy in 3, and ovarian tumor enucleation in 4. The mean (SD; 95% CI) age of the patients was 34.8 (9.7; 27.9-41.8) years, and their body mass index was 21.6 (2.8; 19.4-23.8). In 9 of the 10 patients, the procedure was completed. The 3 tubal sterilization procedures were completed in 18 to 30 minutes, with negligible blood loss. Operative time for the 3 salpingectomies because of ectopic pregnancy was 62 to 116 minutes. One of these procedures included management of 2000 mL hemoperitoneum. Three of the 4 attempts at ovarian enucleation were successfully completed within 64 to 162 minutes, with estimated blood loss ≤ 50 mL. One NOTES procedure failed because of a misdiagnosed peritoneal mucinous tumor located anterior to the uterus and inaccessible, leading to subsequent conversion to transabdominal laparoscopy. Our preliminary results show that purely transvaginal NOTES is feasible and safe for use in performing uterine adnexal procedures in selected patients. However, the procedure cannot be used in patients with cul-de-sac disease, and could have limited use in treating lesions located anterior to the uterus.

Minimally invasive single-site surgery for the digestive system: A technological review

Minimally Invasive Single Site (MISS) surgery is a better terminology to explain the novel concept of scarless surgery, which is increasingly making its way into clinical practice. But, there are some difficulties. We review the existing technologies for MISS surgery with regards to single-port devices, endoscope and camera, instruments, retractors and also the future perspectives for the evolution of MISS surgery. While we need to move ahead cautiously and wait for the development of appropriate technology, we believe that the “Ultimate form of Minimally Invasive Surgery” will be a hybrid form of MISS surgery and Natural Orifice Transluminal Endoscopic Surgery, complimented by technological innovations from the fields of robotics and computer-assisted surgery.

[Novel laparoscopic techniques in gynecologic surgery]

The practice of gynecologic surgery has been revolutionized by laparoscopic techniques in the past decades. Nowadays minimal invasive procedures are feasible and safe standard options in the management of most benign and malignant gynecologic diseases. Natural orifices transluminal endoscopic surgery (NOTES) and laparoendoscopic single-site surgery (LESS) have been developed in an attempt to further reduce the morbidity and scarring with minimal invasive procedures. These techniques share a common conception that a reduction in the number of transcutaneous points of access may benefit patients in terms of port-related complications, risk of hernia formation, recovery time, pain and cosmetics by potentially performing scarless surgery. The development of LESS has been facilitated by the concept of scarless surgical procedures. Increasing experience revealed by recent publications have allowed for the expansion of NOTES and LESS techniques in the gynecologic surgery. Almost all laparoscopic procedures can be performed by acquiring these concepts. Although these surgical methods are feasible and safe, certain technical problems (e.g. loss of triangulation, problems of visualization, ergonomic considerations) has yet to be solved and several questions must be answered before LESS and NOTES could gain widespread acceptance as single procedures. Despite successful technical developments these methods remain investigational approaches and refinement of indications as well as further development of instrumentation are expected to define its area of future application.