A full understanding what amputees do or do not in their real life has so far escaped the acumen of research and development. This explains how > 85% of us still run free, without the real restriction of having to pay massive money for technology that basically makes life more difficult.
A notable exception is my body powered split hook. As we can show how academics comprehensively fail to grasp (haha) the scope and use of prosthetic arm use, even a modest achievement such as this appears quite noteworthy and definitely reportable. After all, absolutely no (0) achievement was delivered by any R&D in the domain of myoelectric arms to this day that has made it to actual everyday use and hard work delivery, both since Cybathlon 2016 (that promised it would "push" development) and generally since >40 years of "research" into myoelectric arm control. As they all have more than a lot to learn (not advancing problematically high error rates in >40 years is a catastrophe or wouldn't you say), we are called upon to focus on the basic.
Today, how to attach the cable of a power supply to a pump.
Out of the box, the pumps and power supplies that we had bought did not fit together. So I removed the plugs of the power supplies, exposed the copper wires, and soldered them to the pump cable.
Here is a soldered cable connection:
Here is a similar connection, after heat shrinking a tube over it to protect it:
The whole process:
Grip wise, the split hook on a body powered arm...:
- allows finely graded grip shifts
- allows widely open visual checks without visual obstruction
- has real time control
- has a massively low control error rate absolutely unmatched by myoelectric arms, not in terms of a few figures, but in terms of several powers of ten
- offers grip geometry and materials of the split hook that match work situation perfectly
- has adequate grip strength
Many body powered arms may be built wrongly as prosthetists try to coerce users to buy far more expensive but error and failure ladden myoelectric arms. If you feel your body powered arm is uncomfortable or breaks too often, it is probably of very poor build and you have all right to bring it back and complain, or even report the prosthetist.