In the summer of 2016, I designed and manufatured two different prosthetic feet. Each are discussed and shown below.
1. Design to allow for multi-contact walking
The first prosthetic foot I designed aimed to enable multi-contact 3D prosthetic walking. There were three primary design changes.
1. Side Profile
The profile of the new design is shaped in a way that will allow for toe/ground contact throughout the toe-roll during push-off. This enables for a higher torque push off and thus has the potential to decrease metabolic cost. The new design can be seen in the top image, the old design can be seen in the bottom image.
2. Top Profile
The contoured shape of the new design allows the foot to be placed inside of a sneaker. The new design also includes features to secure the force sensor voltage converter boards.The new design can be seen in the top image, the old design can be seen in the bottom image.
3. Force Sensor Mounting Features
The bottom of the new design includes features to mount flat force sensors. These force sensors allow the prosthetic to sense which phase of the gait it is in (stance verse swing). The new design can be seen in the top image, the old design can be seen in the bottom image.
In order to machine the new prosthetic foot I became certified to use the Georgia Tech Machining mall.
2. Design to allow for energy capture throughout the walking gait
A second design was created to enable energy to be captured during the heel strike phase of the walking gait and then transfered into energy during toe push off. The design objectives for this new foot were the following:
- Low profile to avoid adding height to AMPRO3
- Use of a spring to add compliance and to capture energy
- A toe that can pivot to maintain contact with the ground during the "push-off” phase of the walking gait
- Designs that are easy to manufacture and low cost
- Curved heel to assist in the heel contact phase of the walking gait
- Date: Summer 2016
- Category: Mechanical Design, Machining, Prosthetic Design