The features and problems of medical equipment maintenance are discussed. A new mode of medical equipment maintenance and a maintenance budget formula are introduced, which solve the problems in maintenance budget.

Objective To develop a novel automatic water system for ventilator humidifier.Methods By hanging the infusion apparatus high,sustained water was filled by driving force of gravity.Liquid level in the thong of the infusion apparatus was detected by the sensor,and the closing and opening of the closing clip was controlled by solenoid valve.Results The closing clip opened when the liquid level inside the ventilator humidifier fell below the lowest setting value and purified water in the infusion bottle automatically flowed to the humidifier.When the liquid level reached the highest setting level,the closing clip was automatically closed.Conclusions The developed automatic water system for ventilator humidifier is effective,convenient,inexpensive,and realized a sustained,relatively steady and a small amount of water process.Meanwhile,humidifier water is stable,heating is uniform,and gas temperature is relatively constant,which can be applied in clinical use.

Plantaris bend malformation of ankle joint,a serious epiphenomenon will occurs when patients lie on bed for a long time.A new type of ankle joint movement device is studied.Powered by electric motor with giant torque and super low velocity and controlled by timing controlling circuit,this device enable the ankle joint a 20?～ 30?back stretch and 40?～ 50?plantaris bend.Furthermore,it can set different moving angle and time according to individual conditions and can perform slow,continuous and reciprocating motion for different actual need.Patients whose ankle joints are unable or difficult to move actively can benefit from this device in preventing plantaris bend malformation of ankle joint,ankle joint stiffness and muscle atrophy of lower limb.

Objective To develop an intermittent type treatment instrument for cervical vertebra.Methods Biomechanics,human body engineering and electronics technique were used.It could heat and lead in the intermittent type.The control electric circuit was composed by 555 IC.Results The product had a good therapeutic effect for cervical vertebra disease.It could alleviate some bad symptoms.Conclusion The intermittent type treatment instrument for cervical vertebra has better treatment effect.It is more desirable to add the function of heating except for pulling.