The Technical Contest Between The Veress Needle And The Optical Trocar

https://en.wikipedia.org/wiki/Veress_needle

Core Perspective: Technological Evolution and Clinical Choice

In the field of laparoscopic access, the Veress needle is not the only option. Since the 1990s, optical trocars and visual obturators have gradually emerged, attempting to replace the "blind" technique of the Veress needle with a "see-as-you-go" approach. Yet, the Veress needle remains mainstream today. This persistence stems from a unique working logic that is difficult to fully supplant. This article analyzes the technical principles of both methods to reveal the irreplaceable nature of the Veress needle.

Working Philosophy of the Veress Needle: Minimizing Trauma, Maximizing Feedback

The core advantage of the Veress needle lies in its minimal diameter (2–3 mm) and low insertion force. It creates only a micro-incision, subsequently establishing the operative space through gas insufflation. This sequence of "establishing space before inserting instruments" avoids the severe injuries that large-diameter trocars may cause during direct penetration. Moreover, the Veress needle provides rich tactile and auditory feedback, allowing surgeons to determine positioning even without visual guidance. For a skilled surgeon, the entire process takes mere seconds and requires no additional equipment.

Working Logic of the Optical Trocar: Direct Entry Under Visualization

Optical trocars (such as the Endopath XCEL) integrate a camera into the obturator tip, allowing surgeons to view tissue layers in real time on a monitor. Theoretically, this eliminates the risks of blind puncture, making it particularly suitable for patients with adhesions. However, its drawbacks are also evident: first, the trocar diameter is larger (5–12 mm), resulting in a greater initial wound; second, the lens is easily obscured by blood or tissue fluid, leading to loss of vision; finally, the cost is high (hundreds of dollars per use), limiting its adoption in resource-constrained regions. More importantly, optical trocars still require significant axial force, and once visualization is compromised, the risk of injury persists.

Clinical Evidence and Selection Preferences

Multiple meta-analyses show no statistically significant difference in the incidence of major complications (e.g., major vascular injury, bowel perforation) between the Veress needle and optical trocars (0.08% vs. 0.06%, respectively). However, regarding minor complications (e.g., preperitoneal emphysema, port-site bleeding), the Veress needle fares slightly worse (2.5% vs. 1.8%). This indicates that both methods have distinct pros and cons. In reality, many surgeons adopt a "hybrid strategy": using the Veress needle to establish pneumoperitoneum first, then inserting the primary trocar under direct vision once the abdomen is adequately distended. This approach combines the small caliber and low cost of the Veress needle with the safety of visually guided trocar placement.

Notably, the Veress needle continues to evolve. Recent innovations include smart Veress needles equipped with pressure sensors that display real-time pressure waveforms to help identify tissue planes. Disposable Veress needles now often integrate irrigation channels, allowing the simultaneous injection of local anesthetic or saline during insertion to further reduce injury risk. These improvements are narrowing the experiential gap between the Veress needle and optical trocars.

Conclusion

The working mechanism of the Veress needle represents a design philosophy of being "simple, yet sophisticated." In an era increasingly focused on visualization and intelligence, it retains a vital position due to its reliability, economy, and instantaneous feedback. The future trend is not replacement, but integration-for instance, incorporating micro-ultrasound probes into the Veress needle to achieve a "tactile + Visual + Ultrasound" trinity. Regardless of technological advancements, however, understanding the fundamental working principles of the Veress needle will forever remain essential knowledge for every laparoscopic surgeon.