The Cavitron Ultrasonic Surgical Aspirator is a unique modality for precise tissue removal which results in increased visibility, reduced bleeding, and shorter operating time when dealing with vascular lesions or organs.
Mutations in the gene for the enzymes superoxide dismutase 1 (SOD1) or copper zinc superoxide dismutase have been found in approximately 15-20 percent of the familial cases of ALS. Some quick math shows, then, that approximately 1 to 2 percent of all cases of ALS involve this particular gene mutation.
However, these genetic causes are only responsible for about 10% of cases (Familial ALS). 90% of cases (Sporadic ALS) have no known cause. As a previous answer said, there may be a combination of factors, both genetic and environmental, which trigger the disease in the majority of patients.