Hasegawa Shin, Yoshida Yuki, Wei Daming, Omata Sadao, Constantinou Christos E
Biomedical Information Technology Lab, University of Aizu, Japan.
Stud Health Technol Inform. 2011;163:218-23.
We simulated the way that pelvic floor muscles (PFM) generate zonal compression on the vagina and urethra in order to maintain urinary continence. Raw data were obtained using a probe to map the distribution of vaginal closure forces. Simulation model was made using ordinary Spring-mass model. The biomechanical properties are applied to the spring of the model. We simulated four models that are applied to asymptomatic subjects as controls and patients based on information obtained from the measured force maps using a vaginal probe. PFM values are measured when subjects are relaxed and during voluntary PFM contraction. Results show that simulation clearly distinguished between controls and patents and demonstrates that in the controls, after a period of 0.075 sec from the time when the rest force was added, the model was deformed to a neutral shape, and after another period of 0.075 sec from the time when the contract force was added at intervals of 0.001 sec, the closure force reaches maximum. The results render the simulation of the vaginal wall deformations that was obtained directly by the force maps. It shows that in controls the wall model is significantly deformed compared to that from the patient's model. In this research we simulated the response of the vaginal walls using spring mass model and the force maps of vaginal closure forces applied to control subjects and patients. The process of deformation of the vaginal wall is thus visualized demonstrating the relative pathologic differences between the two groups.
我们模拟了盆底肌肉（PFM）对阴道和尿道产生区域压迫以维持尿失禁的方式。使用探头获取原始数据以绘制阴道闭合力的分布。使用普通弹簧 - 质量模型构建模拟模型。将生物力学特性应用于模型的弹簧。我们根据使用阴道探头从测量力图获得的信息，模拟了应用于无症状受试者作为对照和患者的四种模型。在受试者放松时和自主进行盆底肌肉收缩期间测量盆底肌肉值。结果表明，模拟能够清晰地区分对照组和患者组，并且表明在对照组中，从施加静息力之时起经过0.075秒后，模型变形为中性形状，并且在以0.001秒的间隔施加收缩力之后再经过0.075秒，闭合力达到最大值。结果呈现了直接通过力图获得的阴道壁变形的模拟。结果表明，与患者模型相比，对照组的壁模型有明显变形。在本研究中，我们使用弹簧 - 质量模型以及应用于对照受试者和患者的阴道闭合力的力图来模拟阴道壁的反应。从而可视化了阴道壁的变形过程，展示了两组之间相对的病理差异。
