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Proper use of laparoscopic trocars is the cornerstone of successful minimally invasive surgery, involving critical steps such as puncture, creation of pneumoperitoneum, and instrument insertion and removal. These procedures require surgeons to possess solid anatomical knowledge, precise technical skills, and strong adaptability.

Principles for Selecting Puncture Sites

The choice of puncture site should be based on a comprehensive assessment of the surgical procedure, patient body type, prior surgical history, and lesion location. Common puncture sites include the umbilicus, lower abdomen (left and right), and subxiphoid region, which must avoid major blood vessels, vital organs, and the rectus sheath to minimize risks of bleeding, visceral injury, and incisional hernia. For obese patients, pregnant women, or those with previous abdominal surgery, individualized adjustments to the puncture site are necessary, and preoperative imaging such as ultrasound may be used when needed for precise localization.

Establishment of the "Safety Triangle" and Management of Pneumoperitoneum

The initial trocar insertion (typically around the umbilicus) is the most critical step, essential for establishing pneumoperitoneum and achieving an adequate surgical view. Common techniques include the Veress needle method or the open Hasson approach. Once the trocar is inserted, a stable pneumoperitoneum is required to proceed with surgery. The valve system on the trocar (including an insufflation valve and sealing valve) maintains a consistent intra-abdominal carbon dioxide pressure (usually 12–15 mmHg) while preventing gas leakage. Intraoperative monitoring of intra-abdominal pressure is necessary; insufficient pressure leads to poor surgical exposure, whereas excessive pressure may compromise respiratory and circulatory function.

Multi-channel Layout and Instrument Coordination

Complex laparoscopic procedures typically require the placement of multiple trocars arranged in a "working triangle" configuration. The positioning of the primary, assistant, and observation (camera) ports should follow the triangular distribution principle, ensuring that instruments and the camera are directed toward the center of the lesion to avoid the "chopstick effect," thereby maintaining operational flexibility and precision. Trocar sizes-commonly 5 mm, 10 mm, and 12 mm-should be selected according to the specifications of the instruments intended for use.

Prevention and Management of Complications

Puncture-related complications are common issues during the learning curve. Vascular injury may lead to retroperitoneal or abdominal wall hematomas, while undetected bowel injury can have serious consequences. Preventive measures include thorough preoperative assessment, use of safety-equipped trocars, direct visualization for subsequent trocar insertions, and careful control of puncture force and direction. Once complications occur, prompt conversion to open surgery is required. Additionally, trocar displacement or dislodgement is a frequent intraoperative problem; new trocar designs featuring anti-slip barbs effectively address this issue.

Conclusion

The application of laparoscopic trocars has evolved from simple access devices into sophisticated operating platforms integrated with multiple safety features. Mastering their use is an essential step for surgeons striving to reach the pinnacle of minimally invasive techniques. With the emergence of new technologies such as surgical robots and single-incision laparoscopy, the design and functionality of trocars will undoubtedly continue to advance.