Documentations of Iterations

Components	Original Design	Iteration
Skin Barrier	The press-and-twist lock should be attached to the given skin barrier using glue or tape.	No changes.
Press-and-Twist Lock	3D printed models that allow the user to exert pressure on the pressure points and twist the cap to secure connection.	1. The “press” function was abandoned due to difficulties experienced in solid modeling and 3D printing.

On the 3D printed model, some filaments on round surfaces failed to stick together and created “bridges”. Nevertheless, the model functioned overall as expected. | | Tube | The diameter of the cross-section of the tube should be close to that of the skin barrier and the “press-and-twist” lock (30mm - 40mm). | We realized that a tube with such a cross-sectional diameter would be too bulky for the user to wear everyday. Therefore, we reduced the diameter of the tube (around 20mm), and 3D printed a funnel to connect the opening of the twist cap to the opening of the tube. However, the funnel was also found to be too bulky so the final prototype went without it. | | Funnel | The funnel connects the inner tube with the press-and-twist lock on the belt. | While originally the funnel was implemented to help direct stool from the stoma into the belt, we realized the funnel would occupy too much space and was not necessary. We removed this feature for our final design as a result. | | Ostomy Belt | The belt should be made of fabric. | The actual belt is made of a series of connecting plastic bags, and each of them is taped to the adjacent bags. Although the new design doesn’t look as aesthetic as the original one, it is durable and waterproof. | | Suspender | Andrew will bring a vest-like suspender, and the belt is anchored to the suspender at several points. | No major changes were made. |