| Total artificial heart is a device that can achieve all physiological functions of human heart.Because it can provide almost unlimited donor,it has broad research prospects.But the existing artificial heart technology is not yet fully mature,and its main defect lies in the design of the driving plan.The pneumatic pulsating full artificial heart,which has been used for clinical use,restricts long time transplant s because of the effect of two infections,and the developed small pulsating full artificial heart driven by motor is also damaged by excessive fever and damage to human organs.This paper develops a new type of pulsatile artificial heart driving scheme,which focuses on improving the efficiency of pulsatile artificial heart.In order to verify the reliability and efficiency of the design,the driving scheme is studied by simulation and experiment.The details are as follows:From the heart's own structural function and its physiological characteristics in the blood circulation system,the main physiological indicators of the human heart are analyzed,and based on this,the technical requirements that the new drive scheme should meet are clearly defined.A driving scheme of reciprocating motion of push plate is presented by using a unidirectional rotating motor,and a parametric output model is set up for this driving scheme.From the analysis of internal flow field of fluid dynamics of total artificial heart angle,whether the pressure of internal flow field to observe the unidirectional rotation drive mode to meet the pressure range without destruction of red blood.To establish the dynamic model of left ventricular total artificial heart,and to encourage the dynamic grid using movement drive scheme,according to the working environment of the human heart boundary conditions on the set.The simulation analysis on the unidirectional rotating drive scheme from circulatory system perspective,aims to discuss whether the different parameters of the total artificial heart blood pressure response curve can meet the body's physiological needs.Based on the basic equations of the two-dimensional elastic cavity theory and the main parameters of the human blood circula tion system,the output blood pressure and blood flow response of the whole artificial heart are derived,and the mathematical model of the test system is established.According to the design parameters of the output model of total artificial heart,simula tion analysis the different structural parameters of the blood pressure response curve to determine the optimum structural parameters of drive scheme.From the experimental point of view,the reliability and efficiency of the unidirectional rotation drive scheme are verified.A single rotation pulsating full artificial heart prototype was developed.The output characteristics of the heart were designed by Donovan in vitro simulated circulation system and heart monitor.The experimental images were compared with the normal people's blood pressure wave and simulation waveform to analyze the rationality of the design of the driving scheme.Finally,the efficiency of this drive scheme is analyzed,and whether the efficiency and heat dissipation requirements raised at the beginning of the project are satisfied. |
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