Design And Research Of Structure Of Bladder Power Pump Driven By Ultrasonic-Vaporized Steam

Micturition dysfunction caused by neurogenic bladder is not only bringing great inconvenience to patients in daily life and work but also easily lead to patients with urinary tract infections, lithiasis, uronephrosis and other kidney diseases, which affects the living quality and life expectancy of patients. The disease is hardly cured by drugs or surgery, so it is fairly important to take artificial auxiliary urination measures. Aming at the problem of micturition dysfunction caused by neurogenic bladder, a bladder power pump driven by ultrasonic-vaporized was proposed in the early stage of the project. The pedestal and the urethra valve are the important components of the bladder power pump. In order to design the structure of bladder power pump rationally, the structures of the pedestal and the urethra valve of bladder power pump are designed in this paper, the structures of the pedestal and the urethra valve of bladder power pump are analyzed by finite element method, the mathematical models of the urethra valve are established, the validity of the mathematical models are verified by simulation and experiment, the performance of urethra valve and the assisted micturition performance of bladder power pump are studied by experiment, the reliability simulation algorithm of bladder power pump is proposed, and the reliability of bladder power pump is studied. The specific contents are as follows:On the basis of meeting the character of human physiological structure and the principle of bladder power pump, the structures of pedestal and urethra valve of bladder power pump were designed, the main materials of the structures were determined by meeting the biocompatibility of human body.The three dimensional models and finite element models of pedestal and urethral valve were established by using Solidworks and ANSYS Workbench. The static and modal analysis and the optimum design of pedestal were completed. The effect of driving force on the opening amount of urethra valve was studied by simulation and experiment. The structure of the urethra valve and the influence of the opening amount of urethra valve by different materials and force modes were analyzed by simulation.Based on the theories of ultrasonics, thermodynamics and fluid mechanics theories, the mathematic models of driving force and uroflow of urethra valve were built, the simulated experimental platform was designed and built, the validity of mathematical models of the driving force and uroflow were verified by experiments. The effect of ultrasonic control parameter on driving performance of the urethral valve was analyzed by simulation in the Matlab and experiment in the simulated experimental platform, the opening/closing performance of urethral valve was verified by experiment, the physical model of bladder power pump was made, the assisted micturition experiment of bladder power pump was studied.According to the structural characteristics and working principle of bladder power pump, the fault tree of bladder power pump was built and analyzed by using fault tree analysis method. Based on fault tree analysis and combined with Monte Carlo method, the reliability simulation algorithm of bladder power pump was proposed. The reliability index of bladder power pump was calculated by simulation, and the validity of reliability simulation algorithm of bladder power pump was verified by theoretical arithmetic.The research results show that:the pedestal and the urethral valve of bladder power pump can meet the character of human physiological structure, it is feasible to use titanium alloy and silicone rubber as the materials of pedestal and urethral valve, the mathematical models of urethral valve and the reliability simulation algorithm of bladder power pump are simple and effective, the driving performance of urethral valve is improved by increasing ultrasonic control parameters, the opening/closing performance of urethral valve is good, the assistant micturition performance of the bladder power pump model is good, and the reliability reaches 0.88 when the average life of bladder power pump is 80000 times. The research findings can provide the basis for optimizing the structure and improving the reliability of the bladder power pump, which can also provide reference for the design of other implantable devices of human.