Crawford N R, Brantley A G, Dickman C A, Koeneman E J
Spinal Biomechanics Research Laboratory, Phoenix, Arizona, USA.
Spine (Phila Pa 1976). 1995 Oct 1;20(19):2097-100. doi: 10.1097/00007632-199510000-00005.
This article reports on the design and use of a new apparatus for creating and monitoring pure, relatively nonconstraining moments to induce flexion/extension, lateral bending, and axial rotation in cadaveric spine segments of two or more vertebrae.
The apparatus was designed to take advantage of the precision and control available in a servo-hydraulic testing frame to efficiently create and monitor testing moments.
Other laboratories have reported methods of flexibility testing that also use cables and pulleys. However, instead of loading the cables and pulleys using a mechanical testing frame, previous systems have used pneumatic actuators or dead weights.
Force from a uniaxial mechanical testing frame is converted to torque applied to the specimen through a system of cables and pulleys. The cable orientation is monitored to ensure that pure moments are created. Applied moments are recorded using one or two load cells.
Sketches of the apparatus are presented and its operation is described.
Because the materials required to build this apparatus are inexpensive and the equipment needed for its operation is common in mechanical testing labs, this design may be useful for researchers interested in beginning in vitro spine flexibility testing with minimal expenditure.
本文报道了一种新装置的设计与应用，该装置用于在两个或多个椎体的尸体脊柱节段中产生并监测纯的、相对无约束的力矩，以诱导屈伸、侧弯和轴向旋转。
该装置旨在利用伺服液压测试框架中的精度和控制能力，高效地产生并监测测试力矩。
其他实验室也报道过使用绳索和滑轮进行柔韧性测试的方法。然而，以往的系统不是使用机械测试框架对绳索和滑轮加载，而是采用气动执行器或重物。
单轴机械测试框架产生的力通过绳索和滑轮系统转换为施加在标本上的扭矩。监测绳索方向以确保产生纯力矩。使用一个或两个载荷传感器记录施加的力矩。
展示了该装置的示意图并描述了其操作。
由于构建此装置所需的材料价格低廉，且其操作所需的设备在机械测试实验室中很常见，因此该设计可能对那些希望以最少的花费开展体外脊柱柔韧性测试的研究人员有用。
