TUR-P phantom for resident surgical training: food-based design as a human mimicking model of the prostate.

Purpose: This study would like to develop a novel model similar to human prostate in terms of its texture profile, sensation upon resection, and anatomical hallmarks for resident transurethral resection of the prostate (TUR-P) training.

Methods: Ten phantom designs were proposed, using broadly available ingredients and a homemade protocol. Three steps of evaluation and development were done: objective measurement measuring texture profile (e.g. hardness, elasticity, cohesiveness/consistency, and adhesiveness/stickiness) using TA-XT2i Texture Analyzer (Llyod Instruments, Ametek Inc) to compare the designs with human prostate, finding the most similar design to prostate; expert consensus by a panel of urologist/senior residents comparing the simulation of TUR-P on the selected design with pre-existing control phantom; and anatomical design development using 3D printing for molding.

Results: Texture profile analysis for mean hardness, elasticity, cohesiveness/consistency, and adhesiveness/stickiness of human prostate was 3753.4 ± 673.4, 85 ± 1.9, 0.7 ± 0.03, and 0, respectively, and design IX was the most similar to human prostate (3660.7 ± 465.6, 87.0 ± 2.5, 0.6 ± 0.05, 0). Furthermore, expert consensus showed superiority of design IX compared with pre-existing control phantom (16.95 ± 1.36 vs 8.86 ± 3.10; P < 0.001). Most of the respondents agreed that the texture, consistency, and phantom ability to mimic human prostate upon resection were similar with human prostate, though hallmarks of the prostate e.g. veromontanum, and lobes were lacking. We used these feedbacks to develop a mold, designed to produce these important anatomical hallmarks.

Conclusion: This study developed a cost-effective prostate model from a food-based design that is similar to human prostate in terms of its texture and sensation upon TUR-P resection provided with important anatomical hallmarks.