On the first prototyping phase, we make a rough prototype to show its feasibility to the client to get budget to continue development. In this phase, the product is awful thing that can never be applied to human directly.

This reminds me of one of the funnier "misspeaks" of my life. Many years ago I was involved in developnig a circulation analysis unit that worked by inserting a catheter and routing it to the vicinity of the heart, injecting a dye and once a second taking a sample through the catheter analyzing the color, and pushing the blood back in. Anyhow we borrowed a dummy to demonstrate on and as part of the unit was a "sterile mambrane" that was a bit costly, so we used standard male contraceptives for test and demonstrations. Anyhow, one day I wen across the street and said "I need two dozen contraceptives, we are going to do a few experiments this afternoon" you should have seen t ho shopkeepers face :)

Erik