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Related Experiment Video

Updated: Jun 20, 2026

Technical Modification of the Terminal Ureter During Total Transperitoneal Laparoscopic Nephroureterectomy for Upper Urinary Tract Urothelial Carcinoma
06:39

Technical Modification of the Terminal Ureter During Total Transperitoneal Laparoscopic Nephroureterectomy for Upper Urinary Tract Urothelial Carcinoma

Published on: November 22, 2019

A new valve-less trocar for urologic laparoscopy: initial evaluation.

Amin S Herati1, Mohamed A Atalla, Soroush Rais-Bahrami

  • 1Smith Institute for Urology, Hofstra University Medical School, North Shore-LIJ Health System, New Hyde Park, New York, USA.

Journal of Endourology
|August 22, 2009
PubMed
Summary

This study found a new valve-less trocar to be safe and effective for laparoscopic renal procedures. It improves visualization and simplifies specimen removal, potentially reducing operative times and costs.

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Urologic Endoscopic Procedure: Cystoscopic Examination01:28

Urologic Endoscopic Procedure: Cystoscopic Examination

Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...

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Area of Science:

  • Minimally Invasive Surgery
  • Surgical Technology
  • Urology

Background:

  • Conventional laparoscopic trocars utilize valves and seals to maintain pneumoperitoneum, but these can impede instrument passage, cause lens smudging, and trap specimens.
  • These limitations can lead to challenges during laparoscopic procedures, including reduced visibility and difficulties with instrument and specimen handling.

Purpose of the Study:

  • To evaluate the feasibility and safety of a newly designed valve-less trocar system in laparoscopic renal surgery.
  • To assess the impact of the valve-less trocar on operative parameters, visualization, and specimen extraction.

Main Methods:

  • A valve-less trocar system, which uses a forced gas curtain for pneumoperitoneum and a separate smoke/gas filtration unit, was trialed in 25 consecutive laparoscopic renal procedures.

Related Experiment Videos

Last Updated: Jun 20, 2026

Technical Modification of the Terminal Ureter During Total Transperitoneal Laparoscopic Nephroureterectomy for Upper Urinary Tract Urothelial Carcinoma
06:39

Technical Modification of the Terminal Ureter During Total Transperitoneal Laparoscopic Nephroureterectomy for Upper Urinary Tract Urothelial Carcinoma

Published on: November 22, 2019

  • Perioperative data, including insufflation gas usage, CO2 elimination, and patient outcomes, were collected and analyzed.
  • Surgeon feedback on system safety, advantages, and disadvantages was also recorded.

    • Main Results:

    • The valve-less trocar was used in partial, radical, and donor nephrectomies with no postoperative complications.
    • Surgeons reported decreased laparoscope smudging, improved visualization due to efficient smoke evacuation, and easier specimen/needle extraction.
    • Low insufflation gas consumption was observed, with no impairment of CO2 elimination. Two patients experienced subcutaneous emphysema, one with pneumomediastinum.

    Conclusions:

    • The valve-less trocar system is safe for laparoscopic renal procedures.
    • Potential benefits include reduced operative times, cost savings from lower gas consumption, and enhanced surgical convenience.
    • Prospective comparative studies are recommended to confirm clinical and economic advantages over conventional trocars.