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Category: Movohook 2Grip

CE marking or norm in relation to components for prosthetic arms

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - CE marking or norm in relation to components for prosthetic arms; published December 25, 2018, 15:20; URL: https://www.swisswuff.ch/tech/?p=7749.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - CE marking or norm in relation to components for prosthetic arms}}, month = {December},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=7749}}


CE-marking or norm

The CE-marking establishes that a particular item or product conform to European product law in relation to health, safety, and environmental protection standards [link].

As this text is not public or may be hard to get into the public eye, why not just go ahead and drag it out. I started to be interested by the backgrounds of what our prosthetic limbs and their technical documentation ideally could be already a few years ago [link].  So, a few blog posts here do have a long history, longer than others, and were assembled over quite a period of time.

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Body powered arms [technical design overview]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Body powered arms [technical design overview]; published November 21, 2013, 07:05; URL: https://www.swisswuff.ch/tech/?p=2371.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Body powered arms [technical design overview]}}, month = {November},year = {2013}, url = {https://www.swisswuff.ch/tech/?p=2371}}


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.

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Approximating the Carroll Quantitative Test for Upper Extremity Function comparing hooks [V2P, Dorrance, Otto Bock] and hands [Otto Bock, Becker Lock Grip]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Approximating the Carroll Quantitative Test for Upper Extremity Function comparing hooks [V2P, Dorrance, Otto Bock] and hands [Otto Bock, Becker Lock Grip]; published February 8, 2010, 02:09; URL: https://www.swisswuff.ch/tech/?p=280.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Approximating the Carroll Quantitative Test for Upper Extremity Function comparing hooks [V2P, Dorrance, Otto Bock] and hands [Otto Bock, Becker Lock Grip]}}, month = {February},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=280}}


I am not saying that the Carroll quantitative test for upper extremity function is necessarily the test most related to my own Activities of Daily Living (ADL). It is not.

But manufacturers are going above and beyond their call of duty to build "bionic" prostheses that seem to excite their engineers, the media and that by and large miss the point of functional prosthetic support while public money for research is wasted away on similarly useful gadgetry. Can you believe it? With a BeBionic hand you can even grab an apple? How amazing! With the iLimb, you can hold a water bottle! Wild! And the Otto Bock Michelangelo hand can also grab an apple. Oh, well.

So again amputees are mostly on their own as far as the real works are concerned.

On my way trying to get an understanding of the interplay between grip angles and usefulness I am trying to work towards better defining a modern test for relevant dexterity. And for that, it helps to play with a previously established test and then discuss maybe what it does well, what it does not show, and what it can be used for.

Furthermore, current advertising for "bionic" prostheses [Michelangelo, BeBionic, iLimb] usually show activities that any prosthesis can achieve and as such do not prove a particular point.

After reading through Carroll's paper, I decided to implement the following tasks:

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Sewing - thread manipulation

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Sewing - thread manipulation; published December 27, 2009, 04:31; URL: https://www.swisswuff.ch/tech/?p=252.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Sewing - thread manipulation}}, month = {December},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=252}}


Grabbing thread. Comparing Otto Bock MovoHook 2Grip (cost: around 1200 USD) and Becker Lock Grip hand (cost: around 600 USD). Maybe the very functional design of hooks implies high functionality - but whether there really is functionality should be tested carefully.

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Industrial design issues - iron AND hook or V2P

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Industrial design issues - iron AND hook or V2P; published December 8, 2009, 02:20; URL: https://www.swisswuff.ch/tech/?p=242.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Industrial design issues - iron AND hook or V2P}}, month = {December},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=242}}


The experience of ironing with a hook. It is also an industrial design issue as it appears. And while I can not offer perfect solutions, I sure can help detailing the process of handling my iron using my hook and - alternatively - using a special terminal device, the V2P prehensor.

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Competitive prosthetic action - compare movement and function II

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Competitive prosthetic action - compare movement and function II; published August 26, 2009, 04:13; URL: https://www.swisswuff.ch/tech/?p=220.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Competitive prosthetic action - compare movement and function II}}, month = {August},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=220}}


In 2018, a prosthetic hook will still be by far the best device for real work (Wolf Schweitzer, 2008).

After iLimb publicity (see here) as well as Michelangelo publicity (here) suggests a superior function of these products I find it helpful to give a more comprehensive side by side view of some "demo actions". Just a simple test of a hook will show you to be very careful when analyzing "performance".

Some comparisons are surprisingly unspectacular. Some are easily performed using almost any prosthesis and then may not count as specific highlight for a particular type of prosthesis.

So if you see a prosthetic hand "perform" - be careful before wasting too much money: try the same "performance" with other options. Be thorough in your evaluation and network with others before spending too much money. You could end up with a different procedure and a different product than initially thought.

I currently favor these parts for best performance:

  • MSM wrist 0.1rev (I find it far more stable than Otto Bock's)
  • Becker Lock Grip hand (allows for more natural grip than Otto Bock hand)
  • Otto Bock MovoHook 2Grip (in absence of a better competitive product)

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Manipulating objects using Otto Bock MovoHook 2Grip P [pimped]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Manipulating objects using Otto Bock MovoHook 2Grip P [pimped]; published April 13, 2009, 22:25; URL: https://www.swisswuff.ch/tech/?p=168.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Manipulating objects using Otto Bock MovoHook 2Grip P [pimped]}}, month = {April},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=168}}


2 Comments

Myoelectric prostheses sales are currently pushed by Otto Bock and many prosthetic technicians, their development is pushed by Otto Bock, DARPA and TouchBionics or others (check the RAPHAEL hand)- yet they are relatively slow and relatively unreliable, relatively loud and relatively heavy, and they are absolutely expensive if they are available at all. I also found that a typical myoelectric arm can be very uncomfortable, painful and cumbersome to wear. So there seems to be a lot of hysteria around this exciting looking science fiction - yet development cannot go in the right direction if acted out by people that lack insight.

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Otto Bock MOVOHOOK 2GRIP 10A80 P [pimped]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Otto Bock MOVOHOOK 2GRIP 10A80 P [pimped]; published April 8, 2009, 17:32; URL: https://www.swisswuff.ch/tech/?p=166.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Otto Bock MOVOHOOK 2GRIP 10A80 P [pimped]}}, month = {April},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=166}}


5 Comments

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.

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Otto Bock MOVOHOOK 2GRIP 10A80

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Otto Bock MOVOHOOK 2GRIP 10A80; published July 29, 2008, 23:00; URL: https://www.swisswuff.ch/tech/?p=30.

BibTeX: @MISC{schweitzer_wolf_1574161334, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Otto Bock MOVOHOOK 2GRIP 10A80}}, month = {July},year = {2008}, url = {https://www.swisswuff.ch/tech/?p=30}}


6 Comments

The Otto Bock MOVOHOOK 2GRIP (part number 10A80) got here today after I had documented previous model build / design problems related to cable control, standard aluminium and steel hook. I love the new hook and it seems like it does all I ask that cable control-hook-combo to do. The MOVOHOOK 2GRIP will be in any new Otto Bock catalog - but right now it's brand spanking new.

A demo page that allows for some functional comparison to other prostheses such as the iLimb has been placed here.

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