The Design And Reserch Of Intelligent Tourniquet

With the development of medical science, medical and clinical tourniquets are required higher precision and credibility. During practical surgery, tourniquet’s capability in precisely calibrating pressure according to patient’s blood pressure is crucial for patient’s safety. Patient’s blood pressure keeps changing during surgery, however current pneumatic tourniquet only keeps the pressure within a limited scale, which means the pressure cannot be calibrated in accordance with patient’s blood pressure on a real-time basis. A small amount of tourniquet that can deliver a real-time performance is expensive. Before surgery, inflation device inflates traditional tourniquet to reach a certain air pressure standard. In this way, arterial blood circulation is stopped and hemostasis is achieved. This paper aims to carry out a study on intelligent tourniquet that is simple and convenient in operation, flexible in manipulation and has little noise. Additionally, pressure is supposed to be timely calibrated according to blood pressure dynamism.Based on the shortage of traditional tourniquet’s failure in real-time pressure calibration, a control system that detects blood pressure and calibrates air pressure timely and its implementation scheme are put forward in this paper. On the basis of previous blood pressure algorithms, a feasible and high accuracy blood pressure judging method is presented. It’s based on Oscillography and Gaussian Fitting. First, peak points are to be found in collected data. Second, envelope curve of Shockwave is fitted by applying Gaussian Fitting in using peak points. The last step, systolic and diastolic pressures are to be got according to their positions by applying formulas in the paper.In the end, adaptive and repeated verification of new judging method is practiced. Comparisons of simulation and auscultatory results are also presented.