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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_1571288746, 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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Skyscraper (2018 film) [review]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Skyscraper (2018 film) [review]; published October 15, 2019, 22:19; URL: https://www.swisswuff.ch/tech/?p=10255.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Skyscraper (2018 film) [review]}}, month = {October},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=10255}}


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This is a Skyscraper (2018 film) review seeing as if we have yet another CGI-altered actor - Dwayne Johnson - try to virtually embody the amputee role that should have been given, clearly, to a real amputee actor. Particularly for this movie.

I (ir)regularly review movies (that I come across) that feature (possibly faked or real) arm amputees. Readers of my reviews typically may get this wrong: but I am not reviewing a movie for its overall plausibility, or its overall entertainment aspect, or maybe its overall relation to contemporay culture generally, here. Here, I am specifically asking how the movie relates to the view of arm amputees in society and how it may influence such a view. I ask, what normative angle the film makers take and what normative views they pass on to the viewers. Given that virtually no one nowadays meets an arm amputee in a whole life time, virtually all "knowledge" of arm amputees they possibly have is obtained via media, so these film makers exploit great social power.

But this movie? Had me scratch my head, to be honest.

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Subaru dashboard modifications [how it is that we ("we") are?]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Subaru dashboard modifications [how it is that we ("we") are?]; published October 3, 2019, 17:23; URL: https://www.swisswuff.ch/tech/?p=10198.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Subaru dashboard modifications [how it is that we ("we") are?]}}, month = {October},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=10198}}


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Sometimes, being an arm amputee is just not what other people think it is.  Fucking isn't, really, anyway, but this is such a shining example. A long time ago, I started having a large roll of red sheet rubber at home, an industry size thing. And double sided sticky tape. And stuff like that. Like, an arm amputee whould need that type of stuff. How come "we" - "the" arm amputees - have materials such as that at home? If they do excavations in, say, 50 years, they may find thes things and go "WTF did that guy do with that".

And it remains a valid question for scholars that study us ("us"): you may read all the works of any official apointee about what one has to consider in terms of prostheses - but you will never find any word about sheet rubber and sticky tape as stuff to keep, alongside WD40.

To the best of my knowledge, therefore, you read that here first, too.

So here we go: Subaru dashboard modifications for the benefit of an arm amputee.

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Subaru Weathertech floormat mount [what it is that we ("we") do]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Subaru Weathertech floormat mount [what it is that we ("we") do]; published October 3, 2019, 16:44; URL: https://www.swisswuff.ch/tech/?p=10207.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Subaru Weathertech floormat mount [what it is that we ("we") do]}}, month = {October},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=10207}}


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This is a bit of Extreme Cyborging microworks: how to make a car floor mat stay in place with sturdy, cheap materials?

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Wie baue ich ein Fahrrad / Velo um für das Fahren mit einseitiger Armamputation? [Erfahrungsberichte / Vorschläge / Anleitung]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Wie baue ich ein Fahrrad / Velo um für das Fahren mit einseitiger Armamputation? [Erfahrungsberichte / Vorschläge / Anleitung]; published August 29, 2019, 16:36; URL: https://www.swisswuff.ch/tech/?p=10034.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Wie baue ich ein Fahrrad / Velo um für das Fahren mit einseitiger Armamputation? [Erfahrungsberichte / Vorschläge / Anleitung]}}, month = {August},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=10034}}


Für das Fahrradfahren mit Armamputation (bei mir: Unterarmamputation rechts) habe ich inzwischen einige praktische Erfahrungen gesammelt. Diese sind hier zusammengestellt.

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Fixing espresso machine: swap pump of Rancilio Silvia [Extreme Cyborging]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Fixing espresso machine: swap pump of Rancilio Silvia [Extreme Cyborging]; published August 24, 2019, 08:57; URL: https://www.swisswuff.ch/tech/?p=10055.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Fixing espresso machine: swap pump of Rancilio Silvia [Extreme Cyborging]}}, month = {August},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=10055}}


While our contemporary circus directors keep fighting with true elephants (Catch-22s: should one hammer with an iLimb? [link] - should one exhibit defect iLimb gloves under use in public? [link]), I used true and established technology [TRS Jaws - link] and fixed my coffee machine by replacing its pump.

While a new coffee machine (the same model but new) would cost me around 800 USD and while a repair by a company or specialist would cost me maybe around 400 USD, the replacement pump that I got via eBay from Bulgaria was 34,90 USD, with shipping 13 USD. Furthermore, the new pump was better - a more solid build, quieter. In addition, I did not have to suffer absence of the machine for more than about half an hour.

So while I do understand why people prefer to chose their prosthetic hand devices for their suitability for posing with them [link], I would propose to anyone that there might be a possibly more meaningful life beyond that.

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TRS Jaws [new product - first use report]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - TRS Jaws [new product - first use report]; published August 10, 2019, 10:51; URL: https://www.swisswuff.ch/tech/?p=9769.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - TRS Jaws [new product - first use report]}}, month = {August},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9769}}


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The TRS Jaws is a voluntary opening gripper where you can set the grip strength by a lever. The grip then varies between very light, maybe under 1 kg or so, to somewhere above 5 kg. This is a first real use report, after I used it permanently since roughly around May 21, 2019, give or take a few hours.

There are just a few points to address at this stage. If you wear a body powered arm for real work [link], you may now buy one.

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Adapting mountain bike (CUBE ACID 29", 2019) for left handed use [photos]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Adapting mountain bike (CUBE ACID 29", 2019) for left handed use [photos]; published August 10, 2019, 10:17; URL: https://www.swisswuff.ch/tech/?p=9900.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Adapting mountain bike (CUBE ACID 29", 2019) for left handed use [photos]}}, month = {August},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9900}}


"Last year, South Africa's Greg Minnaar (Santa Cruz Syndicate), a three-time UCI World Champion, won a record extending 20th Downhill World Cup in Fort William, Scotland. What made these wins unique was that they were the first World Cup events to be won on a bike with 29" wheels. (..) So does this mean the debate is over, and 29" wheels have replaced 27.5" ones? Not so fast!"-- Thinking about wheels? Michal Cerveny [UCI news]

As my trusted old Cube bike died due to age (profuse hydraulic leaks, spare parts > 1 month away, while on bike holidays) it was clear I had to replace it. So I bought the useful (but not overly expensive) CUBE ACID, with 29" wheels, model year 2019, for something over 900 Euros. The dealer gave me a lower price than the indicated / recommended one.

More history is here [link] with my coolest bike mod so far being the Colnago road bike with switched Ultegra levers [link].

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Alita Battle Angel [review - SPOILER ALERT]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Alita Battle Angel [review - SPOILER ALERT]; published August 10, 2019, 06:19; URL: https://www.swisswuff.ch/tech/?p=9815.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Alita Battle Angel [review - SPOILER ALERT]}}, month = {August},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9815}}


This is a review of Alita Battle Angel [link] from view of a right below elbow amputee (see title of this blog maybe?). Herewith, I also issue a SPOILER ALERT.

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How robot technology that is advertised with technically insufficient propaganda numbers does make us truly angry [movie reference: HBO miniseries "Chernobyl"]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - How robot technology that is advertised with technically insufficient propaganda numbers does make us truly angry [movie reference: HBO miniseries "Chernobyl"]; published June 21, 2019, 18:12; URL: https://www.swisswuff.ch/tech/?p=9711.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - How robot technology that is advertised with technically insufficient propaganda numbers does make us truly angry [movie reference: HBO miniseries "Chernobyl"]}}, month = {June},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9711}}


Sometimes, even a fictionalized docu-drama hits all the right notes.

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How is "John without arms" an ableist derogatory Brazilian / Portuguese idiom that directly attributes ignorance and laziness to disability and then uses it a technical amputation descriptor to denote the lazy or ignorant?

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - How is "John without arms" an ableist derogatory Brazilian / Portuguese idiom that directly attributes ignorance and laziness to disability and then uses it a technical amputation descriptor to denote the lazy or ignorant?; published June 20, 2019, 05:33; URL: https://www.swisswuff.ch/tech/?p=9683.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - How is "John without arms" an ableist derogatory Brazilian / Portuguese idiom that directly attributes ignorance and laziness to disability and then uses it a technical amputation descriptor to denote the lazy or ignorant?}}, month = {June},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9683}}


João sem braço ("armless John") is a Brazilian or Portuguese idiom that is used as an epithet for an ignorant and lazy person.

As that in itself is hardly a positive attribute, it is relevant to understand the position of amputees in society, their individual and collective role, in order to see how this is a very ableist and thus derogatory way to formulate the attribute of ignorant or lazy.

Can you open the zipper of my pants please? - Why, do you need to go to the bathroom? - No... (from [link])
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BLUE LIGHT SPECIAL - defect iLimb glove poses tricky Catch-22 for Cybathlon 2020 [review]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - BLUE LIGHT SPECIAL - defect iLimb glove poses tricky Catch-22 for Cybathlon 2020 [review]; published April 21, 2019, 14:42; URL: https://www.swisswuff.ch/tech/?p=9987.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - BLUE LIGHT SPECIAL - defect iLimb glove poses tricky Catch-22 for Cybathlon 2020 [review]}}, month = {April},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9987}}


The Cybathlon 2020 race rules confront us with two interesting Catch-22 aspects:

-hammering (if not other dangerous) activity that is not endorsed by "bionic" hand manufacturers [link]

-use of damaged / perforated covers, not endorsed by Ossur (see here)

The iLimb user / clinician manual clearly states "do not use without an approved cover", "do not use with a damaged cover", and, "damaged covers must be replaced by a qualified Touch Bionics technician or technical partner" 1.

However, the Cybathlon Karlsruhe 2019 footage clearly exhibits a torn and perforated glove (defect over the knuckle of finger II/index finger) being used during the competition during the task that has the competitor push a card into a slot.

From view of a user that had serious issues with these "glove covers" that Touch Bionics (then) / Ossur (now) sold for a premium, and who knows a lot about replacing these with better parts despite manual regulations, this is VERY interesting: because a damaged cover unnegotiably operates far outside the acceptable use condition that appears to be insurable. And insurance seems to be a thing there.

To remind you: Touch Bionics glove covers die by themselves when left alone [link] or when used for something as minor, uninteresting and light as a 10 minute car wash [link]. I was left to myself to identify a work glove [link] and a durable cosmetic glove [link].

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BLUE LIGHT SPECIAL - Hammer use to hammer nails, with "bionic" prosthetic hand, poses tricky Catch-22 for Cybathlon 2020 [review]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - BLUE LIGHT SPECIAL - Hammer use to hammer nails, with "bionic" prosthetic hand, poses tricky Catch-22 for Cybathlon 2020 [review]; published April 20, 2019, 10:28; URL: https://www.swisswuff.ch/tech/?p=9594.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - BLUE LIGHT SPECIAL - Hammer use to hammer nails, with "bionic" prosthetic hand, poses tricky Catch-22 for Cybathlon 2020 [review]}}, month = {April},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9594}}


The Cybathlon 2020 race rules confront us with two interesting Catch-22 aspects:

-hammering (if not other dangerous) activity that is not endorsed by "bionic" hand manufacturers

-use of damaged / perforated covers, not endorsed by Ossur [link]

A hammer, particularly a cheap or small one, even more so than a heavy dangerous "real" hammer, is an unlikely tool to use with an ~80 000 USD myoelectric "bionic" device that is specifically built to sustain only the lightest of work. And the subject of hammering, technically, as arm amputee with a prosthetic arm, has become relevant since the Cybathlon 2020 directors [link] have taken it upon themselves to make it a "discipline".

STOP - HAMMER TIME?

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Becker Hand - best grip in town [mechanism visualization]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Becker Hand - best grip in town [mechanism visualization]; published April 19, 2019, 11:57; URL: https://www.swisswuff.ch/tech/?p=9609.

BibTeX: @MISC{schweitzer_wolf_1571288746, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Becker Hand - best grip in town [mechanism visualization]}}, month = {April},year = {2019}, url = {https://www.swisswuff.ch/tech/?p=9609}}


Visualisation of the mechanism or inner workings of one of the fastest "bionic" (i.e. it has an adaptive grip) prosthetic hands has so far been relatively elusive.

The mechanism is one of the most extremely evolved in prosthetic hand device history - the manufacturer overlooks around 70 years of continuous product evolution. As many large manufacturers today do not "listen" and are not open for suggestion or critical evaluation, they are not making most of their shorter time of product evolution, further crippling their already short market exposure. This explains why the Becker hand is one astonishing perfect product - highly functional, attractive, very robust and very affordable.

Now, we worked out how to plastically show the inner workings or mechanism of a Becker Imperial hand.

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