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Source: © KARL STORZ SE & Co. KG, Germany.

Standard surgical telescopes come in a variety of sizes (ssss1). The most versatile and popular rigid telescopes used in small animal laparoscopy and thoracoscopy are 5 mm in diameter and approximately 30 cm in length. Smaller rigid endoscopes, 2.7 or 3 mm in diameter and 14–18 cm long are ideal for cats, puppies, and toy breeds. With a smaller diameter and shorter shaft, these are easier to maneuver in smaller patients but too short in larger patients, and their light‐carrying capacity may be inadequate in larger cavities, due to the small diameter of the telescope. Telescopes larger than 5 mm in diameter have decreased in popularity, mostly because of the improvements in image size and brightness of 5‐mm and smaller telescopes [1–5, 8, 9].

Conversely, the 10 mm diameter operating laparoscope has become popular. It contains optics similar to that of a 5‐mm telescope but has an integrated working channel that allows passage of 5‐mm instruments down the same shaft. Operating scopes are available in two types: right angled or oblique (ssss1). Some surgeons prefer this style of telescope for certain routine procedures such as biopsies, ovariectomies, and lately natural orifice translumenal endoscopic surgery (NOTES) because the instruments are always under visual control. For this reason, an operating telescope may also be recommended for novice endoscopic surgeons [1–5].