Use of a Novel Steerable Tip Suction Cannula in Large and Giant Pituitary Adenomas: A Cadaveric Feasibility Study

Objective The endoscopic transsphenoidal approach is commonly used for sellar and suprasellar pathologies. However, reaching above the diaphragma sella, especially for posterosuperior and retrocavernous orientation, still poses some challenges. We designed and developed a steerable tip suction cannula (STSC) that has distinct leverage for endoscopic resection of such pathologies.Methods The entire suction cannula is made of stainless steel. The instrument consists of a handle, vacuum tube, suction tip bed, suction tip, finger knuckle, wire path, countersunk headpin, and isolated steel wire. The working principle of the product is to enable the surgeon to move the aspiration tip in the desired direction by steering the finger knuckle. Five cadaveric specimens fixed with the saturated salt solution were used to evaluate the instrument and obtain measurements.Results In the straight position, the STSC aspirated 2.67% slower than the control aspirator tip and 13.24% faster than that at 30 degrees angulation. Based on the CT measurements, the mean angulation of the instrument from the frontobasal axis was 38.3 degrees. The mean distance from the frontobasal axis was 1.3 cm. The average angulation of the tip of the instrument in the cranium was 25.5 degrees.Conclusion The designed STSC might effectively resect large to giant pituitary adenomas, especially those with supradiaphragmatic extension. Its suction capability is comparable to that of conventional suction tubes.