By order of the startup Cross Touch (US), the device was developed to determine the purity of the hands of doctors. The device is attached to the bed or over the bed of the patient. When the doctor comes closer than 4 meters, the motion sensor located at the bottom of the device turns on the red LED. This indicates that the doctor must put his hand to the copper plate (the red part of the device), if the hands are clean, the light changes color to green, otherwise the doctor needs to wash his hands.

The project is expected to be installed in all hospitals in Zambia, as well as in other African countries where there is a problem of cross-contamination.

The short story of the device design:

The client came with a ready dirty prototype and working components inside, some of them had been changed to another for a shape and cost optimisation during the design. 

Research of analogs.

A few sketches.

Sketching took place in parallel with rapid prototyping of clay to check UX/UI and ergonomics.

During CAD modelling we found out that initial motion sensor is too large and it will not work if it is covered with special plastic.

Initial motion sensor.

So we found another one: cheaper, more modern and more compact.

Then all components been located in the best way for the function, shape and ergonomics.

When the 3D model is ready, it goes to the 3D printer.

Fitting the inner components.

Painting the housing.

First prototype for testing general functions, ergonomics and UX is ready.

The next stage of the product development will be the completing the 3D model for manufacturing in China.

© 2019 Mike Wite. All rights reserved.