6
6

Hollies Hand prosthetic

£75 of £10k goal

Raised by 4 people in 21 months
The Story
I'll start this campaign by talking about a girl called Hollie. A year ago Hollie's dad asked me to build her a prosthetic hand. Hollie was born with Amniotic Band Syndrome (ABS)  which led to stunted growth on the right arm, hand and fingers.

Until recently there was very little in the way of prosthetics for someone like Hollie, and besides at her current age she would grow out of a prosthetic fast. In recent years though 3D printing has begun to proove itself via the Robohand project  and its spin offs such as the E-nable group . (Note I and this funding campaign are not affiliated with either group)

I'd previously contributed  to the Robohand design, with elements that can still be seen in many designs today. However I felt Hollie lacked a palm large enough to operate one of these hands well.

Hollies dad agreed with me that I should try and develop a new hand that took advantage of the R&D I was currently developing.
These new technologies involved:

- Creating accurate 3D models  of the complete and the ABS hands.
- Using SLS printed Nylon  instead of fused filament printers (reprap, makerbot etc).
- Using the inherant flexibility of the SLS nylon, for hinges etc.
- Using the more flexible design rules of SLS Nylon to create lighter and stronger parts.

First test fitting to ensure everything is the right size.


So I began building prototypes and things were going well with one problem. Time....

Also Money... But mostly time.

At this point I was working for a 3D printing Studio in Manchester. This covered my living expenses but barely enough to cover the cost of prototypes. The cost of which I was bearing. Time though I lacked most of all.

So I spent months developing each iteration whilst scrapping together the hours to work on it and the money to eventually order the parts to be printed.

In February I started to work as a freelance designer full time. This now meant I was time rich but had even less money to spend on prototypes.

Now this is why I've decided to run a gofundme campaign. I estimate that it costed me between £500-£1000 for each iteration so far. Hollie's grown larger and will need a new scan to continue work. I have new design elements I want to try which will make the design even more functional and realistic, such as 3D printed elastic skin .
Unfortunately this raises the cost of the prototypes.

So why should you fund me?

Well apart from helping Hollie out I have released my designs open source . [This includes my anthromod series of robotic hands.]

I haven't seen anyone else try to create a prosthetic based on a scan of the users complete arm.

I'm trying out different printing methods which should ultimately make manufacture a lot easier and more reliable for these hands.

I'm trying to make it as simple as possible for anyone to do this. I have described several  of the steps I used online and plan to release a full 'how to guide' once it works well.

What will the money allow me to do?

It will let me focus on the design and to generalise the technologies behind it, so that others can use it. It will allow me to spend money on new iterations of the design and to investigate a wider range of materials.

I estimate that it will cost £1000 for each new iteration. £750 to cover my development and design time and £250 for the hand to be printed.
I expect to be able to develop 1-2 iterations per month, with print time taking up most of the time.

The more I raise the longer I can work on it and with more iterations. Ideally I would get enough funding that I can start looking at incoporating myoelectric elements to it such as motors and EMG for nerve control.

Development Photos & Videos

The original plaster casts. Painted to improve scanning.

Slightly adjusted copy of hand  printed on a Lulzbot
The prototypes so far. Earliest to latest.
Tension cable block evolution.

A test of the finger movement on Version 4






+ Read More
Help spread the word!
 148 total shares
Update 9
Posted by Christopher Chappell
17 months ago
   Share
Hollie was able to come and try on the new full coloured hand today. She really liked it and told me that she was getting a lot from the previous prosthetic design I gave her.
I'm going to combine the two and hope to have it ready in the next month.
Hollie trying on the passive hand
+ Read More
Update 8
Posted by Christopher Chappell
18 months ago
   Share
Here is a quick update showing the hand assembled with the prosthetic cup. The loom bands are optional.
Hollies hand assembled
+ Read More
Update 7
Posted by Christopher Chappell
18 months ago
   Share
In order to test out the most recent hand model and texturing I made a passive hand for Hollie. I used Shapeways full colour sandstone material for the print.

This material is quite brittle and grainy so I'm adding a protective layer of silicone to the outside and epoxy resin to the inside. It is only meant for show and not to be used for any load bearing use.

I plan to combine the hand with the Anthromod V2.0 robot hand I'm developing. I will break the textured hand into sections that will act as sheaths to the prosthetic hand.

Hopefully the combination of the two will mean at a distance the hand will look like any other, whilst up close it's comfortably mechanical, and thus skipping the uncanny valley that a lot of flesh tone prosthetics fall into.
Full colour print
Full colour print back
+ Read More
Update 6
Posted by Christopher Chappell
19 months ago
   Share
Whilst I'm developing the Anthromod V2.0 hand which will act as the 'bones' to Hollies hand (and hopefully others) I was thinking about what else I could try.

I figured that I could try texturing the new hand model. I've already cleaned up the scan and opened up the fingers. I have a couple of pictures of Hollies hand from back during the first scan. I decided to try texture painting them onto the new hand.
The pictures unfortunately have a lot of shadow so this wasn't going to be a practical model but it still gave me a proof of concept.

I've uploaded a version over at http://www.thingiverse.com/thing:954769
I've also put a hollowed version on shapeways which indicates it would cost about £50 to have it printed and shipped.

Now the full colour material is very brittle, but I'm going to try a two step approach. One will be to cast resin inside the hand, as a thin layer. The next step is to paint the outside with a clear RTV silicone. This will provide protection as well as a more skin like texture.

Eventually I'd like to combine both this and the SLS nylon print. Although technology might catch up and I'll be able to do both in one piece.
Basic texture test
+ Read More
Help spread the word!
 148 total shares
Read a Previous Update
Samantha Sommerville
18 months ago

Thank you 2 every1 who has donated for my daughter...cant tell you how much its appreciated .thank you sooo much

+ Read More

£75 of £10k goal

Raised by 4 people in 21 months
Created June 2, 2015
£50
Anonymous
20 months ago
£10
Anonymous
21 months ago
1
1
FD
£10
Fi Davies
21 months ago
1
1
JF
£5
Juli Fowler
21 months ago
1
1
Samantha Sommerville
18 months ago

Thank you 2 every1 who has donated for my daughter...cant tell you how much its appreciated .thank you sooo much

+ Read More
or
Or, use your email…
Use My Email Address
By continuing, you agree with the GoFundMe
terms and privacy policy
There's an issue with this Campaign Organizer's account. Our team has contacted them with the solution! Please ask them to sign in to GoFundMe and check their account. Return to Campaign

Are you ready for the next step?
Even a £5 donation can help!
Donate Now Not now

Pledge now, give later.

Pledge Now
You won't be charged for this pledge. We'll let Christopher know that you have pledged support.
Thank you!
Connect on Facebook to keep track of how many donations your share brings.
We will never post on Facebook without your permission.