A device for modeling a pessary is disclosed. A matrix of individually expandable balloons are mounted around a shaft, which holds fill lines for each balloon. The balloons are expandable with fluid to a desired volume and/or pressure, according to comfort and fit determined by real-time patient feedback. Because the volumes and the positions of the balloons are known, a calculation of the dimensions of the vaginal canal can be made, so that the matrix of expandable balloons models the vaginal canal.
