The hand-tools which , during the operation, cause vibrations, are the factor which triggers Reynaud's disease and Dart's disease.
In the Reynaud's disease, which is also known as the disease of white fingers, nerves and blood vessels from the hand that operating the vibrating tool, are injuried permanently. The symptoms are the loss of muscle control of the injuried hand, the affected person presenting difficulties in manipulating things. The feeling is similar with hand numbness while sleeping (pains, numb, tickles).
Dart's disease is not so common as Reynaud's disease and the level of vibrations which can produce it is higher than the frequency of 100Hz.Effects of the disease are opposite to Reynaud's syndrome, where the blood flow was interrrupted and the hands became white. In this case, the blood floods the hands which are becoming painful and blue.
There are some guidelines in order to help designing of such as hand tools which are working and producing vibrations, these guidelines having the aim to reduce the undesirable effects of using vibrating handtools.
No comments:
Post a Comment