Levin S, Pearsall G, Ruderman R J
J Hand Surg Am. 1978 May;3(3):211-6. doi: 10.1016/s0363-5023(78)80084-7.
The development of microsurgical techniques has generated a resurgence of interest in estimating local pressure sensibility as a measure of sensory improvement. Because our experience with Weinstein's modification of Von Frey's probes yielded variable and poorly understood results, we measured two sets of probes and examined them in the light of the engineering principles on which their behavior is based. The mechanical behavior of the nylon monofilaments can be described as buckling with one end built in and the other end pinned. The probes are relatively uniform and consistent. However, no loss in sensitivity would accompany division of the set into two or three equivalent sets. Variations in the buckling stress as high as a factor of eight are difficult to avoid. Gross errors arise from careless application, variations in the elastic modulus due to changes in temperature and humidity, and variations in the attachment of fibers to handles and differences in the ends of the filaments. Interpreting results for this instrument requires an understanding of the factors which can influence those results. The rpobes are simple to use but easy to misinterpret.
显微外科技术的发展引发了人们对通过评估局部压力敏感性来衡量感觉改善情况的再度关注。由于我们使用温斯坦对冯·弗里探针的改良方法得到的结果不稳定且难以理解，我们测量了两组探针，并依据其行为所基于的工程原理对它们进行了检验。尼龙单丝的力学行为可描述为一端固定而另一端铰接的屈曲。这些探针相对均匀且一致。然而，将一组探针分成两等份或三等份并不会导致灵敏度损失。高达八倍的屈曲应力变化难以避免。严重误差源于使用不当、温度和湿度变化导致的弹性模量变化、纤维与手柄连接的差异以及细丝末端的差异。解读该仪器的结果需要了解可能影响这些结果的因素。这些探针使用简单但容易误解。
