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Category: 3D Printing

Experienced user based advice for investors in the domain of prosthetic arms [technical guide for understanding the field]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Experienced user based advice for investors in the domain of prosthetic arms [technical guide for understanding the field]; published July 26, 2018, 15:17; URL: https://www.swisswuff.ch/tech/?p=8702.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Experienced user based advice for investors in the domain of prosthetic arms [technical guide for understanding the field]}}, month = {July},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=8702}}


Investors may need to understand what prosthetic arms really are, how they come about, and what is there to be considered, before investing into a prosthetic arm component manufacturer or research spin off.

With a realistic estimate of around 85% rejection rate, the prosthetic arm industry so far is one of the most unsuccessful industries that there are both in high-tech and medicine technology.

Now, what usually keeps developments, market introductions and user feedback as well as improvement circles going is a successful social setting. Such a really successful circle, where respect combines with a striving for technical proficiency, in the context of prosthetic arms, appears to be largely absent. To a great part, this explains why the current status with regard to marketing, improving or successfully selling prosthetic arms is not a lot better than maybe sixty years ago.

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Towards a more sustainable cosmetic covering / glove for the iLimb Revolution

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Wolf Schweitzer: Technical Below Elbow Amputee Issues - Towards a more sustainable cosmetic covering / glove for the iLimb Revolution; published January 24, 2018, 09:56; URL: https://www.swisswuff.ch/tech/?p=8159.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Towards a more sustainable cosmetic covering / glove for the iLimb Revolution}}, month = {January},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=8159}}


The fragility (and cost) of the gloves or coverings of the Touchbionics iLimb is legendary. No prosthetic hands smokes off expensive gloves faster.

That is in part because the relatively weak but lightweight motors will stop if the glove offers extensive resistance to the hand. So only the thinnest of gloves are given out by Touch Bionics for reasons of grip strength.

Only, as proficient user, that aspect greatly sucks.

Luckily, there is a bit of competition on the glove market - not as much as we wish to be, but some.

This reminds us of the times back in the days, when computer manufacturers issued proprietary video and monitor plugs. And when we got ourselves dip-switch setting modified video plug adapters to hook up Sun monitors on Apple or PC computers despite manufacturers' attempts to dominate device combinations. Growing into an industry that generally gives users only "their own" add-ons, consumables or other prosthetic extensions of any general kind, I was fast to see this as issue here as well.

And while the Bebionic hand's cosmetic glove allegedly may give Bebionic users a difficult time because it restricts or affects the thumb of the Bebionic too much, that glove is thick and sturdy enough to survive and yet sufficiently compliant to work with the iLimb. One will want it when one sees it, it is so good. So I got one because I wanted one when I saw one. Cosmetically, it sucks as it folds up and so on, but then, hiding one's handicap has not been approximated by the "bionic" trend currently happening in the realm of prosthetic hands.

The drawback is that the Bebionic covering's fingers are a bit too long for the iLimb. Here is how I fixed that.

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Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - industrial grip pads [concept, beta]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - industrial grip pads [concept, beta]; published August 17, 2017, 20:15; URL: https://www.swisswuff.ch/tech/?p=7569.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - industrial grip pads [concept, beta]}}, month = {August},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7569}}


Read about the Toughware Equilux here. All prosthetic hooks, prehensors or grippers lack the option of using industrial grip pads. Pads that are readily available, cheap, durable and that the user can easily switch.

And grip pads and grip gloves are a real issue. As posted before, grip pads must be soft,  possible to clean, easy and cheap to replace and convenient. These requirements are in part mutually exclusive. With the knife holding issue of the Equilux, what easier than to mount some standard bike rim brake pads and take it from there.

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Fotoserie - Herstellung und Aufbereitung einer Serie von Passteilen für PMCTA-Sets [photos]

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Wolf Schweitzer: Technical Below Elbow Amputee Issues - Fotoserie - Herstellung und Aufbereitung einer Serie von Passteilen für PMCTA-Sets [photos]; published April 4, 2017, 15:55; URL: https://www.swisswuff.ch/tech/?p=7322.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Fotoserie - Herstellung und Aufbereitung einer Serie von Passteilen für PMCTA-Sets [photos]}}, month = {April},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7322}}


Herstellung von 3D gedrucktem PMCTA Equipment. Alle Teile wurden von mir selbst entworfen und gedruckt. TRS Prehensor im Einsatz.

Fotoserie für die Einreichung zum bgw-Wettbewerb.

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Artistic visions for prosthetic design XXII - Red Hand 2017/I - communicative hand design fitting onto standard Alpha gel liner / Ossur pin with flexible yet reliable comfortable attachment [boosting appearance hand/ boosting wearability in 3D hands]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Artistic visions for prosthetic design XXII - Red Hand 2017/I - communicative hand design fitting onto standard Alpha gel liner / Ossur pin with flexible yet reliable comfortable attachment [boosting appearance hand/ boosting wearability in 3D hands]; published February 19, 2017, 15:00; URL: https://www.swisswuff.ch/tech/?p=7262.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Artistic visions for prosthetic design XXII - Red Hand 2017/I - communicative hand design fitting onto standard Alpha gel liner / Ossur pin with flexible yet reliable comfortable attachment [boosting appearance hand/ boosting wearability in 3D hands]}}, month = {February},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7262}}


#userdrivendesign #bettercyborg #3dprint

The development of an office/presentation hand that is both extremely light and effective as communication tool - rather than the hitherto entrenched exasperated display of ill fated gadgetism with too much dead weight - requires a few tricks. So it is understandable that industry, research and the "open prosthetics" scene has not picked up on it.

So far, "bionic" hand gadgetism has banked upon the fact that still images, photos, posters and derived advertising materials are stunning, and their actual proficiency tests are never longer than some 10 minutes. No bare arm stump survives a 3d printed socket as such though for any serious 8 or 10 hours, and suspension remains problematic, particularly for the self made / open prosthetics scene. That aside, prosthetic hands can still very safely be classified into those that may be used for social or very light use (alliterated as "work", "sports") and those that are really used in a way I find normal but that prosthetists will say is "extreme" (i.e., proper work, or proper sports, as in "real" life usage).

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Guitar pick holder for iLimb / Dunlop TORTEX picks [3d printed solution]

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Wolf Schweitzer: Technical Below Elbow Amputee Issues - Guitar pick holder for iLimb / Dunlop TORTEX picks [3d printed solution]; published February 12, 2017, 17:23; URL: https://www.swisswuff.ch/tech/?p=7198.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Guitar pick holder for iLimb / Dunlop TORTEX picks [3d printed solution]}}, month = {February},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7198}}


As we all know, I just recently designed and rapid prototyped a guitar pick holder for my prosthetic hook.

And guess what, this guitar pick holder also perfectly fits my iLimb revolution, certainly making me the first official "Cyborg AND 3d-print" endowing prosthetic arm guitar player, like, ever ; ) That just got to be raising hell, getting all these new hyped up slogan words lined up, like, together. Plus, this is just a really first test, as in, first minutes. I put in on, and 5 minutes later, this.

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Large 3D hand to clip on TRS prehensor [prosthetic testing]

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Wolf Schweitzer: Technical Below Elbow Amputee Issues - Large 3D hand to clip on TRS prehensor [prosthetic testing]; published February 12, 2017, 17:15; URL: https://www.swisswuff.ch/tech/?p=7210.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Large 3D hand to clip on TRS prehensor [prosthetic testing]}}, month = {February},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7210}}


As always, it is the big things that count. Or, is it ; )

Looking back, Extreme Ironing did not get popular by having folks iron shirts in their gardens, cellars, living room or maybe kitchen. It got popular because, hey, wild!

Same with prosthetic hands.

You may want to think outside the box. One of the things I never understood was why people made the "split hook" / "hand" concept a dichotomy.

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Guitar pick holder for Hosmer 5 hook /Dunlop TORTEX picks [3d printed solution]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Guitar pick holder for Hosmer 5 hook /Dunlop TORTEX picks [3d printed solution]; published February 11, 2017, 00:08; URL: https://www.swisswuff.ch/tech/?p=7189.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Guitar pick holder for Hosmer 5 hook /Dunlop TORTEX picks [3d printed solution]}}, month = {February},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7189}}


I was searching for a practical way to get back to playing guitar with a pick for quite a while. I knew what I wanted - I just had to make it happen.

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Hosmer Mod. 5 hook clip for cell phone cover fixation [3D printed solution]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Hosmer Mod. 5 hook clip for cell phone cover fixation [3D printed solution]; published January 21, 2017, 14:34; URL: https://www.swisswuff.ch/tech/?p=7111.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Hosmer Mod. 5 hook clip for cell phone cover fixation [3D printed solution]}}, month = {January},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7111}}


Since I like to browse on my mobile phone when lying on the back on my sofa, I figured why not make a 3D thingy to allow me to do just that.

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Trautmann hook [3D printed steel parts, assembly, first use]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Trautmann hook [3D printed steel parts, assembly, first use]; published December 28, 2016, 17:53; URL: https://www.swisswuff.ch/tech/?p=7037.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Trautmann hook [3D printed steel parts, assembly, first use]}}, month = {December},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=7037}}


First, I had performed a feasibility test using a PLA model that I had printed myself to see whether I really wanted a Trautman hook. After that, I had decided that I wanted one.

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Freebasing 3D shapes: wine glass holder [way to go]

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Wolf Schweitzer: Technical Below Elbow Amputee Issues - Freebasing 3D shapes: wine glass holder [way to go]; published November 29, 2016, 06:09; URL: https://www.swisswuff.ch/tech/?p=6926.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Freebasing 3D shapes: wine glass holder [way to go]}}, month = {November},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6926}}


While the "bionic" hands are the current darlings of the hypsters, the hooks are the darlings of real people, i.e., those that actually work [definitions here / tongue in cheek / GOH DTE type stuff].

And with that, the real avenue for home improvement are the hooks.

That is where it's at, that is where the future lies, that is where the bear steps (hier steppt der Bär), that is where the pope boxes wearing a chain armour (da boxt der Papst im Kettenhemd).

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Strategy for using 3d printing in your overall problem solving process when working towards prosthetic hand or hook solutions [tip's and trick's]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Strategy for using 3d printing in your overall problem solving process when working towards prosthetic hand or hook solutions [tip's and trick's]; published November 28, 2016, 18:40; URL: https://www.swisswuff.ch/tech/?p=6911.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Strategy for using 3d printing in your overall problem solving process when working towards prosthetic hand or hook solutions [tip's and trick's]}}, month = {November},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6911}}


We all know that the reality of 3D printed parts are somewhere between close enough for rock and roll and utter crap. At the same time, there is a specific reason for that: they are totally available, and they are meant for testing - not for actual use.

I mean, telling people that 1100 USD is cheap for them if you print out their "3d printed hand" is mostly wrong - it costs only a few bucks to make a hand with PLA and it may cost just 100-200 USD to get metal parts. Not a lot more.

But really, you want a strategy.

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Categories: 3D Printing

Trautman Hook (3d printed PLA, first bench test) [design]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Trautman Hook (3d printed PLA, first bench test) [design]; published November 26, 2016, 11:17; URL: https://www.swisswuff.ch/tech/?p=6879.

BibTeX: @MISC{schweitzer_wolf_1574203436, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Trautman Hook (3d printed PLA, first bench test) [design]}}, month = {November},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6879}}


From the idea of Open Prosthetics, I took the Trautman Hook stls (also published on Thingiverse [link][link]) and printed them using PLA on a Makerbot Replicator. Then I put them together and tried them out.

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