Von Frey纤毛机械刺激针遵循Semmes-Weinstein（赛姆斯-韦恩斯坦）测试理论进行设计，可进行精细的触觉检查，可以测定从轻触觉到深压的感觉。

Von Frey纤毛机械刺激针也可叫做Touch-Test单丝测试盒、Semmes-Weinstein触觉测量尼龙丝，能测试和评估感觉水平，Touch-Test™单丝的力量值在5%的标准偏差范围内，测试感觉水平。

利用Touch-Test™单丝感觉测试套装来测试感觉水平，可以准确报告正在减少或恢复的感觉；
测试根据预先设定力的5%的标准偏差进行；

当达到峰值力阈值时，测试笔的单丝呈弯曲形状；
的手柄设计，Touch-Test™单丝可以打开和回收90°角，方便测试和收纳；
手指凹痕设计，具有牢固和舒适的手感；
单丝测试笔手柄上标有相应的压力水平的颜色和编码；
测试结果可以记录在单独出售的手部或脚部筛查表格上；
有5件套手部套件装，6件套足部套件装和20件套装可供选择；

20种单丝规格和所表达的力度值：

1.65（0.008g）、2.36（0.02g）、2.44（0.04g）、2.83（0.07g）、3.22（0.16g）、3.61（0.4g）、3.84（0.6g）、4.08（1.0g）、4.17（1.4g）、4.31（2.0g）、4.56（4.0g）、4.74（6.0g）、4.93（8.0g）、5.07（10.0g）、5.18（15.0g）、5.46（26.0g）、5.88（60.0g）、6.10（100.0g）、6.45（180.0g）、6.65（g）。

不同颜色代码代表不同的压力级别：

1.65-2.83对应正常 Normal
3.22-3.61对应轻触觉减退 Diminished Light Touch
3.84-4.31对应保护性感觉减退 Diminished Protective Sensation
4.56-6.45对应保护性感觉丧失Diminished Protective Sensation
6.65用于深层感觉检测Deep Pressure Sensation Only
 
有手部感觉测试型、足部感觉测试型和全规格测试型可供选择：
手部套件包含：2.83, 3.61, 4.31, 4.56 ,6.65 五种测试单丝，型号：NC12772
足部套件包含：2.83, 3.61, 4.31, 4.56, 5.07, 6.65六种测试单丝，型号：NC12773
全规格套件包含：所有二十种单丝测试---推荐配置，型号NC12775-99

Touch Test

The Semmes-Weinstein monofilaments provide an approximate logarithmic scale of actual force, and a linear scale of perceived intensity. They have a long history of effective use in clinical settings, and can be used to diagnose pathologies of hyper- or hypo-aesthesia. Subsets within the set of 20 probes distinguish pathologies on different parts of the body (foot, hand, lip, cheek,etc.).

Semmes-Weinstein Von Frey Aesthesiometer for touch assessment

Features

Set of 20 monofilaments based on the Semmes-Weinstein monofilament set

Features retractable filaments to protect the filament

Allows the researcher to carry a few in a pocket

The Semmes-Weinstein monofilaments provide an approximate logarithmic scale of actual force, and a linear scale of perceived intensity. They have a long history of effective use in clinical settings, and can be used to diagnose pathologies of hyper- or hypo-aesthesia. Subsets within the set of 20 probes distinguish pathologies on different parts of the body (foot, hand, lip, cheek,etc.).

Operating Principle When the tip of a fiber of given length and diameter is pressed against the skin at right angles, the force of application increases as long as the researcher continues to advance the probe, until the fiber bends. After the fiber bends, continued advance creates more bend, but not more force of application. This makes it possible for the researcher using a hand-held probe to apply a reproducible force, within a wide tolerance, to the skin surface.

Pre-Clinical Use Rodents exhibit a paw withdrawal reflex when the paw is unexpectedly touched. The Touch Test? Sensory Evaluator can be used on the Plantar surfaces of the foot of a rat or mouse. The animal indicates sensation by pulling back its paw. Individual filaments available.