Overview of the first prototype
After several iterations of trial and error in our design, we have successfully created a first prototype of the ultrasound helmet. An image of the CAD model of the prototype is shown below. All parts have been 3D printed in either the Design Studio in Featheringill Hall or the Makerspace in the Wondry, both of which are free design spaces in the Vanderbilt campus.
Our first prototype is able to fit around the head and be adjustable to fit most sized heads. This is achieved through several sliding mechanisms in the base of the helmet that allow it to be adjusted lengthwise and widthwise. Additionally, the three box mechanisms, which will be used to hold the ultrasound probes in place, are also allowed to slide up and down, providing even more freedom for adjustment to individual head sizes and shapes. Screws were employed to keep these sliders in place, once the helmet has been correctly adjusted to fit the head.
You may notice that, contrary to previous design ideas proposed in earlier updates, we have decided to design the helmet into a rectangular box shape. The rationale behind this design versus a design with curvature is two-fold: 1.) this would allow the sliding mechanism to be implemented into the helmet much more easily, and 2.) adjustment to different head curvatures would be easier in a rectangular design than in a curved design. However, the rectangular helmet design runs into the problem of not fitting the head snuggly. This problem will be addressed by inserting a custom-made foam inside the helmet that will conform to the shape of an individual’s head shape.
Future work will be directed towards designing a mechanism that will hold the probes in place within the box mechanism. Additionally, construction of a second prototype is planned, which will be larger in size and will have more structural support than the first prototype.
