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Laparoscopic Trocar and Cannula

For Surgery MCQ kindly follow https://t.me/thinksurgery Trocar/cannula assemblies come in a variety of sizes and styles. Trocars with a pyramidal tip have a cutting edge that penetrates the abdominal wall more readily than trocars with noncutting conical tips, although they are also potentially more traumatic. Some trocars have a retractable blade within the tip. A well-established pneumo- peritoneum must be present for this style to be used to avoid the risk of intraabdominal organ trauma. Cannulae are used to allow passage of instruments in and out of the abdominal cavity while maintaining the pneumoperitoneum. They are constructed with a one-way valve to permit introduction of instruments without the escape of abdominal gas. Additionally, there is a rubber seal at the proximal tip to prevent escape of gas when an instrument is in place. Some cannulae have a side port to allow attachment of insufflation lines to introduce gas during the procedure. The shaft of the cannula can be smooth or threaded. A threaded cannula is more stable and unlikely to move within the abdominal wall during the procedure. Sometimes it is desirable for the cannula to move in and out of the abdominal cavity, such as when the cannula is inserted deep into the abdominal cavity for tissue biopsy. In these instances, a smooth nonthreaded shaft is preferred. For imaging purposes, an appropri- ately sized cannula must be used to ensure adaptation to the tele- scope and other instrumentation. #laparoscopy surgery Trocar Cannula