Metacarpals and carpals are roughly within the palm, all phalanges are the fingers.
Take out distal phalanges from the model, and condense all carpals.
Make the palm not square shaped, but instead use a sloping top, and a rounded off bottom.
Have the pinky be the lowest down and the skinniest of the fingers.
Make the ring and pointer fingers be of even height, and same width.
Have the middle finger be the highest positioned up, and the same width as the ring and pointer.
The pinky finger should be an entire joint lower than the ring finger.
The ring and pointer fingers should be half a joint piece lower than the middle finger
Each similar joint piece should be printed at the same time. The palm part should be first.
The palm and arm connector should be mostly hollow, and provide some kind of hollow hand option if the amputation is at the hand, so the motor can be slimmed down and put into the hollow palm.
The wrist will not be moveable, but will be detachable. Allowing for exchange of different parts.
The wrist will be attached by a tension latch, using a different kind of plastic than the rest of the prosthetic, hopefully.
The forearm part will be hollow, except for the top- this is where the motor will go.
-talk to the nurses about amputations!
Use the hollow forearm to either pack and fit to the client, or to add weights for balance.
Plastics- figure out filaments.
I worked on scanning my classmates arms, and the new app works really well. I'm going to be trying different scans next class and be using them next week. I have a few that are useable, but for now I'm going to be scanning to see if I can get a better arm scan.
What I have done
I have been using WIDAR, an iPad (LIDAR scanning) app, to scan both abiotic and biotic objects. I have verified the apps success and reliability. After a few more scans of one arm, I am going to upload the 3D mesh and model to Blender and focus on making a 3D printable model.
What I plan to do
The printable model shouldn't take very long, but it may taks longer than estimated if something goes wrong with the print. Using Blender I'm going to start building the arm attachment and making sure there is a place for batteries, a motor, and weights. From there I'm going to build up the model in blender, arm attachment up. The fingers will be the hardest I think, but It shouldn't be too complicated.
What I need
I will need to make sure the prosthetic is able to be wired, and ideally make it able to be hooked up to a headset, but that will be later. So for now I need a motor, batteries, and a lot of time to make sure it prints well and the 3D model works.
Prosthetics are some of the most expensive parts of medical care, and some of the least accessible due to the technology and credentials required for care. I’m Madeleine Bailey and my Senior Capstone is 3D printing prosthetics, aiming to make these more sustainable, and attainable. While making this project I did a lot of research into the current prosthetics market, and how it is both helpful and unhelpful to amputees, or their families.
Hi, My name is Madeleine Bailey, and My Senior Capstone Project is 3D printing Prosthetics. I am focusing on the three problems with the current prosthetic market, and hoping to improve upon all three with 3D printing, scanning, and modeling. Attainability, Sustainability, and Affordability.
The problem: Expensive prosthetics, most prosthetics, are not available to people below the poverty line. Statistically, people in developing countries have higher amputee rates and lower prosthetic availability.
The Solution: remove the expenses, and the lack of prosthetics. 3D printed prosthetics ship easier, and are easier to make. Using 3D scanning technology a model of an arm is made, and adjusted in accordance with the amputated arm.
Currently, prosthetics are not sustainable, with the average lifespan reaching somewhere between three months and five years. For many, repeated replacement of the individual limb isn’t attainable, especially for people below the poverty line, people without healthcare of any kind, and people in developing countries. 3D printing can shorten prosthetic build time to hours instead of the weeks or months it might take normally. Quick print time and cheaper products mean both less waste and also less of a replacement hassle when a prosthetic inevitably gets damaged. The materials used for printing are easier to transport and also easier to attain, despite not necessarily being better for the environment. The materials used, plastics, wires, and other materials, while not cheap, are far more affordable than carbon fiber or high-tech titanium.
Tying back to both sustainability and attainability, Affordability comes full circle and impacts all of the current prosthetic market. Right now company made prosthetics are not affordable to people below the poverty line, not without some kind of luck. Even in countries with consistent healthcare, health insurance rarely covers more than 50% of the fees, and for a prosthetic that can cost, minimum, $5,000, this is unattainable to many.
Who does this affect?
The inability to get a prosthetic might be workable for some, but for people who need support, either for their job, or for their quality of life, this can impact both a single person and their family greatly.
3D printing prosthetics brings the total make time down by several days at the least, and costs somewhere between two to fifteen dollars to print in total depending on the material used and the size of the print. This, costing significantly less than an average prosthetic, means that consumers and buyers of the product will be able to get an initial print very easily, and also a repeat prosthetic if it were to break or become unusable.
Using Lidar and 3D scanning software I have been able to create 3D prototype models of people, and isolate different parts of them. Isolating, and then manipulating the scan online with 3D Modeling software like Blender allows me to create mock-ups and printables of prosthetic parts.
My Next steps are going to be printing a working arm, and wiring everything together. I aim to be able to have everything put together by March, giving myself some flexible room to move in case something goes wrong.