The Design And Implements Of Angiopress SCD

With the rapid development of vascular surgery and various professional clinic skills, the deep vein thrombosis (DVT) detection rate increase gradually in recent years. DVT has become a common peripheral vascular disease. It usually happens concomitantly with serious syndromes. For example, pulmonary thromboembolism (PTE), one of its syndromes, is very dangerous to people’s health or even life. DVT often appears after surgery and is hard to be diagnosed, so prevention is much more important than treatment. Preventive methods include physical massage, taking drugs or combination of both. As the simple drug prevention exist some disadvantages and under this condition safe and effective mechanical methods attract more attention and currently become the hotspot of research and application.The angiopress SCD, designed in the paper, is a kind of this mechanical device which prevents DVT. It takes the ship S3C2440as microprocessor and7inch touch screen to display. The main circuit includes power module, display module, AD convertion module and magnetic valve driver module and the air pipe line includes air compressor, gasholder, magnetic valve, tube and quick connector.The most remarkable feature of this system is gathering two inflatable way, impulse way and slow way. The impulse inflatable way, called AV pump too, by mimicking blood circulation in people’s legs when walking, can fill the airbag outside the foot in a very short time and squeeze blood and lymph which makes blood return in a high speed like a impulse of acceleration when sporting. This way can effectively prevent deep vein thrombosis and eliminate edema. The slow inflatable way through inflate and deflate multi-airbag regularly and press the body in a circulation can promote the venous return, strengthen the artery perfusion, improve blood and lymph circulation, prevent coagulation factor gathering or adhesion, increase fibrinolytic system activity and at last prevent DVT and eliminate edema.This paper first analyzes the venous blood flow characteristics and studies the formation, pathophysiology, diagnosis, treatment and prevention of DVT which is theory basis to design angiopress SCD. Then, based on the given design requirement this paper introduces the detail realization process, including hardware and software design. In hardware design process, this paper has designed gas path and made the main control circuit board. In software design process, this paper has written a series of control programs in a good user interface. Finally, this paper makes a test, pressure and actually use. The results show that this angiopress SCD designed in this paper is qualified and fully reaches the expected requirement and is feasible to prevent and cure DVT.