Acoustic myography as a control signal for an externally powered prosthesis.
Acoustic myography as a control signal for an externally powered prosthesis.
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DOI：
10.5555/uri:pii:0003999386903941
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发表时间：
1986-04
影响因子：
4.3
通讯作者：
Daniel T. Barry;James A. Leonard;Andrew J. Gitter;Richard D. Ball
中科院分区：
文献类型：
--
作者：
Daniel T. Barry;James A. Leonard;Andrew J. Gitter;Richard D. Ball
收缩骨骼肌会产生可以用标准麦克风轻松录制的声音。这些声音的记录被称为声学肌动描记法，或 AMG。作为外部供电假肢的控制信号，AMG 相对于表面肌电图的一些优点是： 不需要直接接触皮肤； AMG信号不受皮肤阻抗变化的影响； AMG 强度足够高，可以从标准麦克风产生 50 mV 输出，需要较少的放大和电屏蔽；与 EMG 相比，AMG 信号对肌肉上的位置的敏感度较低。 AMG 容易受到外部环境噪声干扰等缺点相对容易克服。为了证明这一点，我们构建了一个肌声控制的假手，其通过单个麦克风的三态控制（与差分控制）证明了其在更困难的情况下的可行性。该设备的控制电路成本不到 50 美元。现有的装置采用的是独立的手；目前正在设计一个可以比较 AMG 与 EMG 控制的假肢外壳。两名尝试过的患者仅经过三分钟的练习就学会了可靠地张开和合拢手。正在制定 AMG 控制功能评估的协议。
Contracting skeletal muscle produces sounds that are easily recorded with a standard microphone. The recording of these sounds is known as acoustic myography, or AMG. As a control signal for an externally powered prosthesis, some advantages of AMG over surface EMG are: there is no need for direct skin contact; the AMG signal is unaffected by changes in skin impedence; AMG intensity is high enough to produce a 50 mV output from a standard microphone, requiring less amplification and electrical shielding; the AMG signal is qualitatively less sensitive to placement on the muscle than EMG. Disadvantages, such as the susceptibility of AMG to interference by extraneous environmental noise, are relatively easy to overcome. To demonstrate this, we have constructed a myoacoustically controlled prosthetic hand, whose tristate control via a single microphone (vs differential control) proves its feasibility in the more difficult case. The control circuitry for this device costs less than $50. The existing device utilizes a free-standing hand; a prosthetic shell which will allow comparison of AMG vs EMG control is currently being designed. The two patients who have tried it have learned to open and close the hand reliably after only three minutes of practice. Protocols are being established for functional assessment of AMG control.