C7: Biomechanics

EXPLORATION OF DESIGN GUIDELINES OF SUPPORTIVE UNDERWEAR TO IMPROVE PELVIC FLOOR RELAXATION USING A FE MODEL OF THE BUTTOCKS


Daisuke Tawara1, Tomohiro Nishiki1,2, Sanae Ninomiya3, Hisayo Okayama4, Kiyoko Naito5, Kyoko Nakanishi4, Shigehiro Morikawa6, Jiro Sakamoto7


1Ryukoku University, Japan;
2TAKARA BELMONTCorp., Japan;
3Kyoto University, Japan;
4Shiga University of Medical Science, Japan;
5Biwako-Gakuin University, Japan;
6Molecular Neuroscience Research Center, Shiga University of Medical Science, Japan;
7Kanazawa University, Japan


Stress urinary incontinence, which is a well-known urological disease in postpartum women, progresses due to descent of organs in the pelvis induced byweakness in the pelvic floor muscles. It has been reported that it had been improved by lifting up the bladder neck using supportive underwear, suggesting that higher elevation of the bladder neck is important. In order to establish an appropriate design for underwear, it is necessary to clarify the relationship of the magnitude between pressures of supportive underwear and elevation of organs. In this study, first, finite element (FE) model of the pelvis, which simply consisted of pelvis, bladder and other soft tissue, of a middle-aged female Japanese which was constructed based on MRI images. Second, we experimentally measured the relationship between force and displacement for the soft tissue of the subject around the pelvis and explored Young’s modulus of the soft tissue. We also analyzed magnitude of the elevation of the bladder neck under the application of pressures from the existing supportive underwear and compared it with the previous experimental results to validate our model. Third, we performed FE analysis changing the combination of pressures of the underwear to evaluate change in magnitude of elevation of the bladder neck and propose appropriate combination of pressures. As results, magnitude of the elevation of the bladder neck relatively increased when the pressure of the region from abdomen to pubis decreased and the region from perineum to coccyx increased. In addition, deformation of the bladder neck was consistent between the simulation results and the previous experimental results, meaning that our simulation method was valid. Therefore, decrease of the pressure of the region from abdomen to pubis and increase of the pressure of the region from perineum to coccyx are useful for an appropriate design of supportive underwear.  

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