Design of a Bézier-profile horn for high displacement amplification

Wang, Dung-An; Chuang, Wei-Yi; Hsu, Keng-Tsang; Pham, Huy-Tuan

doi:10.1016/j.ultras.2010.07.004

Cited by 63 publications

(37 citation statements)

References 15 publications

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“…6 Impedance and phase spectrum of a Si scalpel with design B showing the matched PZT/system half-wave (λ/2) mode at 57.7 kHz and the unmatched PZT/system full-wave (λ) mode at 74.8 kHz the waveguide width. The design of ultrasonic waveguides presents a trade-off between amplification and mechanical reliability which has been studied extensively by many groups (Lal 1996, Wang et al 2011, Eisner 1964. We combine the advantages of a stepped waveguide and a catenary waveguide into a hybrid design, called the modified stepped waveguide (Table 1).…”

Section: Transducer Geometrymentioning

confidence: 99%

“…On the other hand, transducers designed such that the resonance frequency of the piezoelectric actuators is not matched to the resonance frequency of the structure are easier to control, but are also more easily damped by an applied load. ((Wang et al 2011), Lal 1996. A modified stepped waveguide has been chosen for the Si micromachined scalpel due to its reduced stress concentration and good displacement amplification.…”

Section: Transducer Geometrymentioning

confidence: 99%

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Silicon micromachined ultrasonic scalpel for the dissection and coagulation of tissue

Lockhart

Friedrich

Margairaz

et al. 2015

Biomed Microdevices

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This work presents a planar, longitudinal mode ultrasonic scalpel microfabricated from monocrystalline silicon wafers. Silicon was selected as the material for the ultrasonic horn due to its high speed of sound and thermal conductivity as well as its low density compared to commonly used titanium based alloys. Combined with a relatively high Young's modulus, a lighter, more efficient design for the ultrasonic scalpel can be implemented which, due to silicon batch manufacturing, can be fabricated at a lower cost. Transverse displacement of the piezoelectric actuators is coupled into the planar silicon structure and amplified by its horn-like geometry. Using finite element modeling and experimental displacement and velocity data as well as cutting tests, key design parameters have been identified that directly influence the power efficiency and robustness of the device as well as its ease of controllability when driven in resonance. Designs in which the full- and half-wave transverse modes of the transducer are matched or not matched to the natural frequencies of the piezoelectric actuators have been evaluated. The performance of the Si micromachined scalpels has been found to be comparable to existing commercial titanium based ultrasonic scalpels used in surgical operations for efficient dissection of tissue as well as coaptation and coagulation of tissue for hemostasis. Tip displacements (peak-to-peak) of the scalpels in the range of 10-50 μm with velocities ranging from 4 to 11 m/s have been achieved. The frequency of operation is in the range of 50-100 kHz depending on the transverse operating mode and the length of the scalpel. The cutting ability of the micromachined scalpels has been successfully demonstrated on chicken tissue.

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Section: Transducer Geometrymentioning

confidence: 99%

Section: Transducer Geometrymentioning

confidence: 99%

Silicon micromachined ultrasonic scalpel for the dissection and coagulation of tissue

Lockhart

Friedrich

Margairaz

et al. 2015

Biomed Microdevices

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show abstract

“…Ladder, cone, exponential, and catenary 54,55 Four-terminal network method, 56 analytical method, 57 transfer matrix method, 58 apparent elasticity method, 59 and finite element method 60 Figure 10. Common structure of magnetostrictive transducers.…”

Section: Horn Structures Research Methodsmentioning

confidence: 99%

Advances in rotary ultrasonic machining system for hard and brittle materials

Zhou

Zhang

et al. 2019

Advances in Mechanical Engineering

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Rotary ultrasonic machining has been widely used for machining of hard and brittle materials due to the advantages of low cutting force, high machining accuracy, and high surface integrity. Focusing on the development of specialized rotary ultrasonic machining systems, this article summarizes the advances in the functional components and key technologies of rotary ultrasonic machining systems for hard and brittle materials, including the ultrasonic generator, power transfer structure, transducer, ultrasonic horn, and cutting tool. Developments on the automatic frequency tracking method, the establishment of an electrical compensation model for power transfer, the energy conversion characteristics of piezoelectric materials and giant magnetostrictive materials, and the design methods for the ultrasonic horn and cutting tool were elaborated. The principle of magnetostrictive energy conversion, output amplitude characteristics of a giant magnetostrictive transducer, and high-power giant magnetostrictive rotary ultrasonic machining systems were also presented. Future research and developments of rotary ultrasonic machining systems regarding the ultrasonic generator, amplitude stability, energy conversion efficiency, vibration mode, and system integration were finally discussed.

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“…The mechanical magnification of the input signal amplitude is generated by the horn varying cross section from an initial value 0 , in the origin of the reference system, to an end one value ( Figure 1). Generally, the cross section variation is given by different mathematical functions (exponential [13], linear [14], tapered (or stepped) [15], catenoidal [14], Bézier [16], Gaussian, etc.). Studies concerning the wave propagation and basic concepts of horns design are presented in different papers [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A New Approach on Vibrating Horns Design

Guiman

Roşca

2017

Shock and Vibration

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An optimization method of the vibrating horns is presented considering the smallest action principle and the attached cutting tool mass. The model is based on Webster's wave propagation equation and as an objective function the minimization of the volume in structural equilibrium conditions was considered. The considered input parameters were working frequency, maximum crosssectional area, magnification coefficient, and the attached mass. At the end of the study, a new shape function of the horn's cross section is obtained. The particularity of the new obtained shape is given by the nodal point position that is the same with the position of the maximum cross-sectional area. The obtained horn was analyzed from the modal point of view using theoretical and experimental methods. As theoretical methods, both the state-space method and the finite element method were used. An experimental setup for frequency response function determination was developed using a random input signal. The verification of the magnitude value was done considering a harmonic steady-state signal. The recorded values were compared with the predicted values. The numerical simulations and tests support the validity of the assumptions used in the horns optimization design.

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Design of a Bézier-profile horn for high displacement amplification

Cited by 63 publications

References 15 publications

Silicon micromachined ultrasonic scalpel for the dissection and coagulation of tissue

Silicon micromachined ultrasonic scalpel for the dissection and coagulation of tissue

Advances in rotary ultrasonic machining system for hard and brittle materials

A New Approach on Vibrating Horns Design

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