Ultrasonic scissor holder that achieves pure torsional output through helical grooves

Abstract

This invention discloses an ultrasonic scalpel holder that achieves pure torsional output through helical grooves, comprising a scalpel holder, an ultrasonic transducer, an amplitude transformer assembly, a first connector, and a second connector. The ultrasonic transducer includes a primary amplitude transformer and two identical ultrasonic generating assemblies symmetrically connected to both ends of the primary amplitude transformer. A first flange is provided in the middle of the primary amplitude transformer, and a first helical groove and a second helical groove are symmetrically formed on both sides of the first flange on the outer wall of the primary amplitude transformer. The structural parameters of the first and second helical grooves are determined by a method including the following steps: constructing stress-strain equations for the incident, reflection, and refraction of plane waves at the first and second helical grooves; solving the stress-strain equations to determine the torsional principal stress wave and the torsional principal stress angle, which are dominated by the synthesis of reflected longitudinal waves and refracted transverse waves propagating circumferentially; and determining the structural parameters of the first and second helical grooves based on the torsional principal stress wave and the torsional principal stress angle.

Images