Okay, I'm curious now![]()
From a question in the Post your Last Purchase thread ....
Earlier in that thread you might have seen a post that showed a purchase of insulin for animals. We found out our oldest dog is diabetic and requires shots of insulin twice a day. While this isn't much of a problem for me, my wife has issues with her hands (which I won't go into here) and has difficulty pulling back the insulin syringe to fill it. Holding the vial and pulling the plunger on such a small thing is just beyond her capability.
So I got the idea to make a device to do it for her.
Put the syringe in the cradle (light gray) as shown and apply pressure to the lever arm and it provides enough pull to get the syringe started. The blue rods are there for spring tension. This was 3D printed and originally the "spring" was just a couple of pieces of PLA filament, but it has too much memory and after a few pulls it no longer functions as a spring. So, I thought I'd get some tempered spring steel wire and see what I could devise. I figure to bend the wire into a more manageable shape, more like a "P" so it rides in the tracks.
Here's the second prototype.
See how the "springs" no longer sit in the tracks. I also am tweaking the design so it will sit flat on a table and possibly provide support for the insulin vial as well.