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Like all machines the arm enables us to work conveniently. The arms are used in every physical activity e.g. moving and lifting objects, sports, writing, driving etc. When a person loses an arm due to accidents, birth defects, disease or chemicals, an artificial one can replace it. The Dermatos is an example of a prosthetic arm. The Dermatos appearance is very close to that of the natural arm. Dr.Lawson is one user of the Dermatos arm and he describes it as, "this is the most functional arm prosthesis I have ever had. My patients are relaxed and are not even aware of my amputation! I can now concentrate on my patients' needs without being distracted by their reaction to a prosthesis... it looks so real!" Prosthesis arm is changing the lives of many disabled. It did so for Dr.Lawson and 13-year-old Diamond Excell. Diamond was born without arms but on her birthday with the help of a prosthetic arm created by Dr. Ivan Yaegar, she was able to do something she had never done before, hug her mother. Her story was written in ABC news. "M I A M I, March 15 - It was the birthday gift of a lifetime for 11-year-old Diamond Excell: a pair of arms." "In Miami, Ivan Yaeger, gave Diamond Excell a very special gift. Diamond was born without arms and Ivan designed prosthetic arms that allowed her to hug her mother for the first time. By moving muscles in her back, Excell can send signals to her brain, which turns them into electrical messages that control motors inside the prosthesis. The prosthesis has three motors that open and close the joints. Ivan Yaeger, the arms' designer, used existing electronics and off the shelf parts to construct the arms for Excell. "Words cannot express the way I felt when she hugged me with those arms," her mother Delia Excell says.
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