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Direct Insertion Technique
In the direct insertion technique, the primary cannula–trocar assembly is placed without preinsufflation. This technique is not regularly performed in veterinary medicine but can be performed with either a bladed trocar and a blind technique or an optical trocar under some measure of direct visualization. Theoretical advantages include decreased time to establish abdominal laparoscopic access, but potential disadvantages may include a higher rate of trocar‐related intraabdominal injuries. Several published series evaluating the direct trocar placement technique have demonstrated that very low rates of injury are possible [10]. For inexperienced surgeons, the direct access technique is likely associated with unnecessary increased risk compared with alternative techniques [4, 11].
Optical trocar assemblies can also be placed with a direct technique. A gradual twisting motion is used, and distinct layers of the abdominal wall can be seen during entry.