Team UnLimbited invent the reverse dovetail gauntlet

Following on from the development of the thermo-gauntlet by e-NABLE members and Team Unlimbited I mentioned to Stephen in one of our hangouts that it would be better if the dovetail on the gauntlet that allows the tension block to connect was raised up on a pillar. This would allow for the overall gauntlet shape to follow the contour of the forearm better without the dovetail deforming.

 

Stephen and I discussed a few ways this could be done, remembering we wanted to maintain easy printability and strength.

Later that day, Stephen sent me a picture of his interpretation of the initial idea; he had invented the reverse dovetail thermo-gauntlet !

By turning the dovetail joint around and making it less wide would allow for thermo-forming to have more material that could be formed while still leaving a connection for the tensioner box.

Steve also realised that the tensioner box could be customised to a different shape.

Steve Wood AKA Gyrobot also pointed out that the bottom of the tensioner block does not have to be flat and that lead to a few more different designs as well.

Steve and I wasted no time running a few off on our printers to validate the dovetail joint strength, position and little retaining notch used to clip the tension block on.

After a few little tweaks we were happy that the reverse dovetail gauntlet works well; the different shape now possible can be seen in the pictures below compared with the standard thermo-form gauntlet.

Team unlimited will be adopting this gauntlet in our devices for our recipients and we have already done so in both Mollie’s and Abbi’s device. Abbi reports the gauntlet fits much better and is more comfortable for her to wear, the increased comfort also helps with her grip strength when bending her wrist.

Team Unlimited are currently re-modeling the reverse dovetail gauntlet into Autodesk fusion 360 file format and it will be released back to the e-NABLE community for all to use.

Stephen's 2nd Recipient - Mollie

Mollie was the second child that I was asked to help by the charity REACH. Mollie who is thirteen was missing her fingers on her right hand, and had a partial thumb. After discussions with her and her parents, we considered a thumb-less Phoenix Hand, but on Mollies input decided to use a standard hand. The day that I delivered Isabella's arm I decided to drop in to see Mollie with some test parts to check the measurements to get the best fit possible. Mollie requested a pink and purple hand. She told me that she would like to have her hand ready before going on holiday. So I worked late every night to get Mollies hand ready for her. On this hand I decided to test my newly designed reverse dovetail gauntlet, with a newly designed custom 3 pin tensioner box, which allows for a better adaptive grip. When ready I completed a 200 mile round trip to deliver and fit the hand. Mollie had never had a prosthetic before, and within minutes of putting on her hand she was going around picking everything up she could. She couldn't wait to show all her friends. Mollie's smile made all the late nights worth it. It was one of the best days ever.