Phononic crystal theory-based method for determining cutter bar structure of ultrasound knife

Abstract

The invention provides a phononic crystal theory-based method for determining a cutter bar structure of an ultrasound knife. The method comprises the following steps of setting the cutter bar structure of the ultrasound knife to be a periodic repetition structure with a variable cross section; configuring the periodic repetition structure into a phononic crystal structure with a variable cross section; forming an energy band structure when an ultrasonic wave is transmitted in phononic crystal of the periodic structure, calculating the energy band structure of the phononic crystal structure with the variable cross section according to a phononic crystal band-gap characteristics calculation method and determining pass band and stop band ranges of longitudinal vibration and bending vibration in the energy band structure; determining the cutter bar structure of the ultrasound knife in pure longitudinal vibration, adjusting the set periodic repetition structure until the working frequency of the ultrasound knife is in the pass band range of the longitudinal vibration and the stop band range of the bending vibration. The periodic structure is introduced into a cutter bar, and the cutter bar structure is adjusted by employing a phononic crystal theory until the working frequency is limited near a pure longitudinal vibration mode, so that the cutter bar structure design of the ultrasound knife in pure longitudinal vibration is achieved.

Description

technical field [0001] The invention relates to ultrasonic technology, in particular to a method for determining the structure of a knife bar of an ultrasonic knife based on the theory of phonon crystals. Background technique [0002] During the working process of the ultrasonic scalpel, due to external interference and load, it is easy to convert the vibration mode from simple longitudinal vibration to other vibration modes, which reduces the energy output efficiency and the cutting ability of the ultrasonic scalpel. For the ultrasonic scalpel with straight rod configuration, multiple vibration modes may appear in the selected frequency range under the longitudinal excitation of the transducer, such as longitudinal vibration, bending, torsional, radial and multi-mode coupling. Near the longitudinal vibration frequency, there are many different types of resonance modes, which make it easy for the transducer to excite multiple vibration modes or coupled vibration modes. In a...

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Problems solved by technology

In addition, when the ultrasonic knife is working, the resonant frequencies will shift to different degrees under different load conditions, making the conversion and coupling of multiple vibration modes more random

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