Body powered arms are not the same. Despite everyone saying they understand what these are, these arms are not the same.
My setup explained, a generic setup explained. To show similarities and differences. For those in need to learn about this, technical differences to myoelectric arms are explained.
Currently, my friends who built my wrist units along the MSM series now release this product for sale:
Our first prototype (also check the road map) had to be wiggle free, be rock sturdy and be fast to produce.
Our second prototype now is the type of lock that I always wanted - sleek, rock solid and superbly functional.
- Lift as much weight as my silicon liner can transmit on the arm.
- No wiggle.
- Switch any rotational position and switch it fast
Due to that mostly very good performance of the Otto Bock MovoHook 2Grip both initially and in due course of performance testing, I figured that the only significant problem so far - loose joint - warranted serious dedication to get it fixed.
Always, developments with new ideas cause people to get interested in the legal and constructional aspects. The MSM wrist information is posted here.
We started to develop a wrist joint - or a mechanical wrist joint - for my cable controlled arm prosthesis (or body powered arm prosthesis). The wrist joint should contain a quick release mechanism to allow fast switching of hook, hooks, hands, terminal devices, experimental tools or anything of that nature.
If you are interested in the time line of previous and future developments of our MSM wrist, here's the right place to check.
Contact me for further details (email address ~ wuff *@@@* swisswuff.ch).
After an initial prototype was built and after I used it for a while, two major inconveniences (1: inbus screw issue; 2: cable pull direction has to match sprocket design issue) became apparent.
Since our roadmap currently does not provide for a new major MSM wrist release in the near future and since Otto Bock has not announced a comparably sturdy design, we decided to move towards fixing the MSM wrist 0.1 prototype's initial issues.
After my problems with rather small bolts and a cylindrical spring-based squeeze-hold mechanism for wrist/connector unit (Otto Bock part 10V9/10V10, cost 429.95 CHF) and after I did not detect any subsequent technical innovation being mentioned in the answers I obtained from the manufacturer (Otto Bock), we decided to move on to build our own setup.