Читать книгу Small Animal Laparoscopy and Thoracoscopy - Группа авторов - Страница 110

Disposable cannulas are very common in human medicine, but their cost limits their use in veterinary medicine. There are multiple different types of disposable trocars, including bladeless trocars with safety shields (Figure 4.18), inflatable flanges to help with retention, and optical trocars (Figure 4.19). Optical trocars have a transparent plastic sleeve, into which the laparoscope may be fitted before insertion of the trocar, enabling the surgeon to monitor the passage of the instrument through the layers of the abdominal wall. The internal surface of the sleeve must be nonreflective to avoid light from the laparoscope interfering with the surgeon's view.