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Category: Hosmer Dorrance

Soldering cable connection and heat shrinking tube over connection (Extreme Cyborging Microworks)

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Soldering cable connection and heat shrinking tube over connection (Extreme Cyborging Microworks); published April 4, 2019, 06:59; URL: https://www.swisswuff.ch/tech/?p=9463.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Soldering cable connection and heat shrinking tube over connection (Extreme Cyborging Microworks)}}, month = {April},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9463}}


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.

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Angular constraints of prosthetic grippers and functional success correlation [technical evaluation]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Angular constraints of prosthetic grippers and functional success correlation [technical evaluation]; published February 11, 2019, 04:55; URL: https://www.swisswuff.ch/tech/?p=9322.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Angular constraints of prosthetic grippers and functional success correlation [technical evaluation]}}, month = {February},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9322}}


I had evaluated, subjectively, the grip performance of various prosthetic options that I have. These have been already analysed in the context of grip taxonomy, where so far, research has largely focused on grip geometry as such, using some idiosyncratic logic that I found not too relevant.

Using a more relevant logic, I approached the question of grip mechanic from a different angle, both verbally and proverbially speaking: from a user angle, both actually geometrically and subjectively speaking.

I realized that most of my frequently used grips and grip situations fall into a far more narrow range of angle distributions than I had ever assumed.  So I sat down to add "typical object angles" to my already present grip success statistics over a list of my most frequently or typically used grips. Then I did that in theory and THEN I figured, why not go and video some. Thereby, a prosthetic hook as gripper device appears to be a lot more advanced, design wise, geometrically, in reducing device materials, bulk and design to approximate a really good overall use performance than the iLimb (which I have here also for as much testing as I like) and with that, many current commercial (or other) multi articulated hands.

In fact, prosthetic hands appear to be by far the older (and thus possibly less reflected) geometric design idea of a prosthetic arm's terminal device than the definitely more modern split hook. I may also go history hunting, but the claim that a split hook is old or outdated, and that therefore by inference a prosthetic hand is automatically new or more modern, as an idea, is wrong, particularly technically speaking. But also historically, to replace a hand with a hand is a straightforward design idea, that does not take any imagination, thus it is reportedly old, very old.

The far more elegant reduction, also of angles and controls, to fit into the limited action and option constraints of an arm amputee, is certainly that of a body powered split hook. It boils down the prosthetic needs to a successful sleek elegant reduction of a functional minimum, making it the ideal choice for anyone that wants a maximum of performance from a minimum of failure, cost, decay, bulk, futile grip attempts and total overhead. The subtle distinction is that a "body powered split hook" is an entirely different beast than a passive hook, obviously, which probably no one ever noticed, particularly not the people that assumed that a body powered split hook is best portrayed by installing a "Captain Hook" metaphor.

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How to apply wood screws in series - demonstration, difficulties [bench work]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - How to apply wood screws in series - demonstration, difficulties [bench work]; published October 26, 2018, 14:52; URL: https://www.swisswuff.ch/tech/?p=8717.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - How to apply wood screws in series - demonstration, difficulties [bench work]}}, month = {October},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=8717}}


I happily cut and mounted two wooden boards into a pre-existing shelf frame. For that, a series of wood screws were put into place.

If you are interested in mount, assembly, and screws, read these earlier posts, too:

Dismantling, loading, transporting, unloading and reassembling shelf [bimanual, activity] {illustration, a peek into the life of a person with a handicap}

 

Drill a screw [1-handed way]

The ultimate bimanual task - the IKEA Pax wardrobe system with gliding doors [tricks,tips and yeehaw]

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Understanding and informing design issues of a prosthetic arm for below elbow amputation by way of "taxonomy" [literature review, reality check]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Understanding and informing design issues of a prosthetic arm for below elbow amputation by way of "taxonomy" [literature review, reality check]; published July 26, 2018, 21:18; URL: https://www.swisswuff.ch/tech/?p=7651.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Understanding and informing design issues of a prosthetic arm for below elbow amputation by way of "taxonomy" [literature review, reality check]}}, month = {July},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=7651}}


The academic and industrial attempts to approach prosthetic arms so far have been met with less success than the providers must have hoped for. Far less, in fact so little that we wonder what is going on.

Possibly, design issues are the key to this as however vaguely put, some analytic approach needs to inform better design - but how to really inform better design from issues based on analysis? What is a suitable analysis? If we cannot see any better designs anywhere in practice, real life, then what is the analysis worth? Can we analyze analyses to get a better understanding of what might be going on there?

We might best start with what we know to be true.

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Case-study of a user-driven prosthetic arm design: bionic hand versus customized body-powered technology in a highly demanding work environment [article out]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Case-study of a user-driven prosthetic arm design: bionic hand versus customized body-powered technology in a highly demanding work environment [article out]; published January 4, 2018, 14:29; URL: https://www.swisswuff.ch/tech/?p=8066.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Case-study of a user-driven prosthetic arm design: bionic hand versus customized body-powered technology in a highly demanding work environment [article out]}}, month = {January},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=8066}}


 


This is a blog post of one of the rare focused and well based scientific journal articles that really explains how real work, body powered and myoelectric arms relate and go together for a unilateral right below elbow amputee in a physically demanding work environment.

The prior presentation of this paper [poster at Cybathlon symposium 2016], which had been more pragmatically worded (with me thinking people would know anyway), this was now written up as article and published. During that process, the reviewers clearly made great points of all kinds of aspects I never knew were not sky clear to everyone.

So maybe, writing a ~ 30 page case study with > 210 references does clarify stuff, at least potentially and for those that actually read it. But possibly, it still requires attention to even just read it.

Knowledge does not come easy, Highlander! (Nakano, in: Highlander III The Final Dimension)

 

If you are more interested in visionary posts, read about the gadget features of the prosthetic arm in Kingsmen: The Golden Circle [link]. And technically, myoelectric control did have it coming. That technology remained uncool for four decades [link].

Publication [link]

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Grip strengths (measured results)

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Grip strengths (measured results); published January 18, 2017, 20:09; URL: https://www.swisswuff.ch/tech/?p=7085.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Grip strengths (measured results)}}, month = {January},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7085}}


Using a Camry EH101 electronic hand dynamometer, I went through a few prosthetic terminal devices for my arm to see just how strong they were. And I added a baseline for my (human) left hand and my (bare) stump.

This certainly provides a base for a range of discussions later. Or previous ones ; )

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Towards Extreme Cyborging (EC) microworks: very small things [grip mechanics theory, parametrization and then testing side by side - Trautman hook, Hosmer Mod 5 hook, TRS Prehensor, Touch Bionics iLimb revolution]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Towards Extreme Cyborging (EC) microworks: very small things [grip mechanics theory, parametrization and then testing side by side - Trautman hook, Hosmer Mod 5 hook, TRS Prehensor, Touch Bionics iLimb revolution]; published December 28, 2016, 17:52; URL: https://www.swisswuff.ch/tech/?p=7010.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Towards Extreme Cyborging (EC) microworks: very small things [grip mechanics theory, parametrization and then testing side by side - Trautman hook, Hosmer Mod 5 hook, TRS Prehensor, Touch Bionics iLimb revolution]}}, month = {December},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=7010}}


Small things to be picked up, side by side demo with other prosthetic devices.

Yes, very small things.

"It is the little things that count", they said. "The little things are important", they said. They all said that. But behold, their "bionic" apparatus cannot handle little things! "Why is a hook not evil", they wondered. And a storm of little demo videos came upon them. Deep into the myriad of grip mechanics this went.

"Get a grip on grips", he said.

This totally bypasses the fact that after laying down real life consequences for what I call Extreme Cyborging, I just finished building my first own steel Trautman hook, and all just with shape information from the internet. Yeah, you read that right. I did not build yet another one of the ubiquitous funny hands that promises to change my life or what it is these 3D printed hands now do - no. I sit on the demand and I sit on the technology and what is it that I do? See? This is what should really disturb you - because given the current signs of the times, it should feel deeply wrong on many levels. To you. But then, we were likely living on different planets all along, and maybe it is time you realize that too ; ) After we knew since years in detail what the Cybathlon showed us yet again, with glory but not with any improvement, it is yet again up to us, the users, to push further into what is, what can be, and what matters. And honestly? We have seen far enough funny hand videos.

What we have not seen is the Rebirth of The Cool. The Rebirth of an absolutely insane gripper. Physically. In 3D printed steel. The Trautman hook is such a device. And I went for it just because I can.
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3D printing requires a prosthetic hook [easing into tech]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - 3D printing requires a prosthetic hook [easing into tech]; published November 25, 2016, 19:49; URL: https://www.swisswuff.ch/tech/?p=6874.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - 3D printing requires a prosthetic hook [easing into tech]}}, month = {November},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6874}}


The notable civilatory achievement of being able to "print 3D hands" is a media hype thing. No one that I know personally wears one.

But it is interesting to use this technology. 3D printing, that is.

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Casio wrist watch wrist band swap [technical, EC microworks]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Casio wrist watch wrist band swap [technical, EC microworks]; published November 24, 2016, 19:44; URL: https://www.swisswuff.ch/tech/?p=6851.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Casio wrist watch wrist band swap [technical, EC microworks]}}, month = {November},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6851}}


I switched the old used up Casio watch wristband against a new one. I used a prosthetic hook to do it.

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Stabilizing rod-like item with a prosthetic hook [two ways]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Stabilizing rod-like item with a prosthetic hook [two ways]; published June 23, 2016, 16:36; URL: https://www.swisswuff.ch/tech/?p=6205.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Stabilizing rod-like item with a prosthetic hook [two ways]}}, month = {June},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6205}}


There are basically two ways to stabilize a rod-like item (fork, knife, rod, etc) with a prosthetic hook.

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Prosthetic options and Yenga - intricate grip differentiation details [up close grip mechanics]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Prosthetic options and Yenga - intricate grip differentiation details [up close grip mechanics]; published June 14, 2016, 19:30; URL: https://www.swisswuff.ch/tech/?p=6144.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Prosthetic options and Yenga - intricate grip differentiation details [up close grip mechanics]}}, month = {June},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6144}}


Playing Yenga at a prosthetic arm workshop was interesting.

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Hosmer Model 6 Work Hook [tweak / improvement / backlock feature]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Hosmer Model 6 Work Hook [tweak / improvement / backlock feature]; published June 2, 2016, 11:47; URL: https://www.swisswuff.ch/tech/?p=6102.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Hosmer Model 6 Work Hook [tweak / improvement / backlock feature]}}, month = {June},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6102}}


The Hosmer Model 6 Work Hook is by far the most robust, powerful and useful commercially available terminal device for real work, besides the Toughware PRX V2P Prehensor and the Toughware PRX Retro. This Hosmer device is particularly useful due to the backlock feature that allows the user to reliably hold also relatively heavy machines for an extended period of time (such as hedge cutters).

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ARMCAM - prosthetic hook, kitchen activity [ADL, activities of daily living]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - ARMCAM - prosthetic hook, kitchen activity [ADL, activities of daily living]; published April 10, 2016, 19:01; URL: https://www.swisswuff.ch/tech/?p=5839.

BibTeX: @MISC{schweitzer_wolf_1569176696, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - ARMCAM - prosthetic hook, kitchen activity [ADL, activities of daily living]}}, month = {April},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=5839}}


I consider kitchen clean-up, dish washer emptying and that sort of thing a typical ANPPN (activity of no particular prosthetic need). But as is, one can speed things up with the right type of prosthetic. For me, housework has to move fast forward, and I mean, fast forward. I am not interested in drawing it out to a drama. I have no time to dick around.

So seeing as if some people that are totally new to the term "manual work" come to town, time to show some relaxed easy housework ploughing forward through the duties; this video was not done with any focus on speed but as normal routine clean after we had coffees and stuff to eat one weekend morning.

Using a small Mobius action cam tied to the prosthetic socket, here is that bit of kitchen activity.

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