Ultrasonic surgical horn for approaches to brain tumors and spine applications

Ultrasonic surgical aspirators are used for removal of tumors in the brain and approaches in spine, where a transducer and horn with a central hole fragment and suction tissue. Bone fragmenting and aspirating surgical tips (horns) are discussed for accessing deeper regions in the brain and for emerging spine applications. Attaining resonant frequency, predicting displacements, and monitoring stress distribution and errant motion are afforded with FEM (Finite Element Method) for emerging complex-contoured horns, complementing one-dimensional physical-mathematical models. A full model method with no artificial constraints and a damped forcing function yields agreement between measured horn displacement and FEM results within 2.5% error (e.g. 5 ¿m in 224 ¿m p-p) for the new geometry and baseline horns of this study, and 6.8% error (8 ¿m in 117 ¿m p-p) for more complex models.