Safety And Complication Prevention — Clinical Essentials in The Use Of Laparoscopic Cannulas

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Although the design of laparoscopic cannulas is already very mature, complications caused by cannulas remain a challenge that minimally invasive surgeons must face in clinical practice. Statistics show that the incidence of cannula-related complications is approximately 0.5% to 1%. Although this percentage is not high, once it occurs, the consequences are often very serious, such as major vascular rupture, intestinal obstruction, or port-site hernia. Therefore, in-depth understanding and strict adherence to cannula usage protocols are compulsory lessons for every laparoscopic surgeon.

First and foremost is the choice of puncture technique. Currently, there are mainly two methods in clinical practice: the blind method (Veress needle + cannula) and the direct visualization method (Hasson method). The blind method is fast but relies on the surgeon's experience and grasp of anatomical landmarks. During blind puncture, it is essential to ensure that the cannula is perpendicular to the abdominal wall and to stop advancing immediately upon feeling the "give" (loss of resistance). Many serious vascular injuries occur because the surgeon continues to push after feeling the breakthrough. The direct visualization method involves making a small skin incision, then using a blunt or shielded obturator to enter the abdominal cavity layer by layer under direct visual guidance. Although this method takes slightly longer, its safety is extremely high and is especially recommended for patients with a history of abdominal surgery or suspected adhesions.

Second, beware of "occult injuries." Some patients develop symptoms such as abdominal pain and distension days after surgery, and examinations reveal delayed intestinal perforation caused by the cannula. This usually happens because the intestine was temporarily pushed aside during puncture, and the tip grazed the serosal layer, which went unnoticed at the time. To avoid this, after placing all cannulas, the surgeon should use the laparoscope to inspect the tissues around each cannula, ensuring that no bowel or omentum has been accidentally entrained.

Third, regarding cannula fixation. During surgery, frequent instrument exchanges and traction can easily cause cannulas to slip out. Once a cannula dislodges, it not only causes a drop in pneumoperitoneum pressure but may also allow subcutaneous tissue around the cannula to embed into the wound, causing secondary injury. Therefore, for obese patients or lengthy procedures, it is recommended to use fixation cannulas with threads or balloons. If ordinary cannulas are used, they should also be properly secured to the skin with sutures.

Finally, details when removing the cannula after surgery should not be overlooked. Before withdrawal, it must be ensured that carbon dioxide gas in the abdominal cavity has been completely evacuated to prevent shoulder pain caused by subphrenic gas accumulation. At the same time, for cannula puncture sites larger than 10mm in diameter, especially at the umbilicus and upper abdomen, the fascial layer must be sutured closed. This is a critical measure to prevent postoperative port-site hernia, as larger fascial defects rarely heal on their own.

In summary, although small in size, the laparoscopic cannula carries immense safety responsibilities. From preoperative assessment, to intraoperative technique, to postoperative management, every step requires the surgeon's utmost focus and rigorous attitude. Only in this way can the advantages of minimally invasive technology be truly realized, allowing patients to recover safely and swiftly.