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    • 6. 发明申请
    • TORSIONAL MODE ULTRASONIC GENERATOR
    • 扭力超声波发生器
    • WO2010049684A1
    • 2010-05-06
    • PCT/GB2009/002562
    • 2009-10-27
    • SRA DEVELOPMENTS LIMITEDYOUNG, Michael, John, RadleyYOUNG, Stephen, Michael, RadleySLIPSZENKO, James, AntonEDE, Michael, James
    • YOUNG, Michael, John, RadleyYOUNG, Stephen, Michael, RadleySLIPSZENKO, James, AntonEDE, Michael, James
    • A61B17/32
    • A61B17/320068A61B2017/320096A61B2017/320098
    • Apparatus (5, 50) for generating torsional-mode ultrasonic vibrations comprises a stack of axially-polarised piezo-electric ceramic rings (10) having a torsional converter (1, 51, 53) mounted coaxially to either one face of the stack or to two opposite faces thereof. Each torsional converter (1, 51, 53) has a cross-sectional inhomogeneity comprising a plurality of helically-extending grooves (2, 55) extending substantially from end to end of the converter. The grooves (2, 55) each have a length, measured axially along the converter (1, 51, 53), of approximately half the wavelength of ultrasonic vibrations therein. When the stack is energised, the stack and the converter (1) or converters (51, 53) resonate together in a purely torsional-mode vibration. The apparatus (5, 50) is compact and axisymmetric, and is straightforward to incorporate into a simple tool handpiece. The ultrasonic vibrations may be transmitted along a conventional elongate waveguide (3) of a tool to a distal operative tip (35). A very high amplitude torsional oscillation may thus be induced at the operative tip (35) of the tool. Alternatively, a further converter element (32) may be located at a distal end of the waveguide (3) in order partially to convert torsional-mode to longitudinal-mode vibrations for tool operative tips requiring combined-mode oscillations.
    • 用于产生扭转模式超声波振动的装置(5,50)包括一组轴向偏振的压电陶瓷环(10),其具有同轴地安装在叠层的任一个面上的扭转变换器(1,51,53),或者 两个相对的面。 每个扭转变换器(1,51,53)具有横截面不均匀性,其包括基本上从转换器的端部到端部延伸的多个螺旋形延伸的槽(2,55)。 槽(2,55)各自具有沿着转换器(1,51,53)轴向测量其长度大约为其中超声振动波长的一半的长度。 当堆叠通电时,堆叠和转换器(1)或转换器(51,53)以纯扭转模式振动共振。 该装置(5,50)紧凑且轴对称,并且可以简单地结合到简单的工具手柄中。 超声波振动可以沿着工具的常规细长波导(3)传输到远端操作尖端(35)。 因此,可能在工具的操作尖端(35)处引起非常高的幅度扭转振荡。 或者,另外的转换器元件(32)可以位于波导(3)的远端,以便部分地将扭转模式转换为需要组合模式振荡的工具操作尖端的纵向模式振动。