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One of the main problems in the Parkinson patients daily life is they have difficulty in writing, especially in some cases where they have to sign, such as housing transfer, contract signature, writing problem becomes more knotty.
The lower the center of gravity is ,the more stable the object is, using this principle, Smoothin combines the retractable ballpoint pen. More fluent and smooth writing will be achieved with the transition of gravitational potential energy as the center of gravity change, eliminating the influence of tremor.
Dalian Minzu University