1, the maintenance of the receiving cavity Daily maintenance methods are the same as the general upper limb prosthetic receiving cavity, but special attention should be paid to the electrodes and wires and the maintenance of the rotating mechanism and micro switch parts. Pay attention to avoid water, humid air into, keep dry, prevent wire disconnection. Electrode and skin contact surface is easy to stick to dirt and rust, special attention should be paid to keep the electrode surface clean, around the electrode is easy to accumulate dirt, which is also easy to cause accidents and short circuit. 2, electric upper limb prosthetic care and maintenance of prosthetic and institutional components of the care and maintenance: mechanical parts should be in accordance with the instructions for proper care and maintenance: (1) prosthetic in use can not be overloaded, otherwise it will damage the parts; (2) do not let people who do not know how to operate; (3) do not randomly disassemble the parts; (4) found that the mechanical part of the noise or abnormal sound, should be carefully checked. Found problems, send professionals to disassemble and repair; (5) after one year of use, add lubricant to the transmission part and rotation shaft. Prosthetic electrical components maintenance and maintenance: (1) the battery voltage should not be lower than the rated voltage, such as found that the prosthetic start slow or can not start, should be charged after use; (2) to prevent the wire connection cross, kink, insulation damage caused by short circuit; (3) to prevent overload operation.