Simulation and Experimental Study of Internal Urethral Valves with External Magnetic-controlled

doi:10.3969/j.issn.1004-132X.2021.02.005

Abstract

Abstract: In order to overcome the problems of tissue necrosis caused by continuous compression on urethra of artificial urethral sphincter, an internal urethral valve that controlled by external magnet was designed. Flow-pressure characteristic mathematical model and magnetic driving force calculation model were established. Finite element method was used to analyze flow field distribution, influence factors of liquid resistance and magnetic driving force. Simulation experimental system of lower urinary tract was established to study the urine flow rate-intravesical pressure characteristics and magnetic driving force characteristics. The results show that the flow rate increases with the increasing of opening of valve port and semi-cone angle of valve core, magnetic driving force increases with the increasing of outer magnet thickness and the reducing of air gap. The maximum urinary flow rate may reach 28.7 mL/s, in line with the law of human urodynamics.

Key words: urethral valve, finite element method, magnetic driving force, maximum urinary flow rate

摘要： 为克服人工尿道括约肌长时间压闭尿道引起组织坏死等问题，设计了一种体外磁控内置式尿道阀。建立了流量-压差特性及磁驱动力数学模型，应用有限元法计算分析了流场分布、液阻和磁驱动力的影响因素。搭建了下尿路模拟实验平台，研究了尿流率-膀胱压特性、磁驱动力特性。结果表明：增大阀口开度和阀芯半锥角均能增加尿流率；增大外磁体厚度、减小气隙均能增大磁驱动力；最大尿流率可达28.7 mL/s，符合人体尿动力学规律。

关键词: 尿道阀, 有限元法, 磁驱动力, 最大尿流率

CLC Number:

TH137
R318.6

FU Qingyun1;LI Xiao1;LI Shu1;PENG Weihong1;GUAN Ting2.

Simulation and Experimental Study of Internal Urethral Valves with External Magnetic-controlled

[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2021.02.005.

付青云1;李笑1;李树1;彭伟鸿1;关婷2. 体外磁控内置式尿道阀仿真与实验研究[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2021.02.005.

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