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Category: ADA technologies / Physionetics / Toughware PRX

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_1571242946, 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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3D-print molded Protosil RTV 245 (durometer shore 40A) silicone covers for Toughware Equilux [proof of concept, demo of "bionic" grip]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - 3D-print molded Protosil RTV 245 (durometer shore 40A) silicone covers for Toughware Equilux [proof of concept, demo of "bionic" grip]; published February 4, 2018, 11:50; URL: https://www.swisswuff.ch/tech/?p=8248.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - 3D-print molded Protosil RTV 245 (durometer shore 40A) silicone covers for Toughware Equilux [proof of concept, demo of "bionic" grip]}}, month = {February},year = {2018}, url = {https://www.swisswuff.ch/tech/?p=8248}}


It is sometimes more fun to present the technical results before or even instead of explaining exactly why.  So in short, I 3d-designed and then printed molds to make grip covers for really serious grip performance of a Toughware Equilux device.

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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_1571242946, 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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Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - first usage report [NEW PRODUCT]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - first usage report [NEW PRODUCT]; published August 13, 2017, 20:06; URL: https://www.swisswuff.ch/tech/?p=7462.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Toughware Equilux - new VO (voluntary opening) / VC (voluntary closing) body powered device - first usage report [NEW PRODUCT]}}, month = {August},year = {2017}, url = {https://www.swisswuff.ch/tech/?p=7462}}


I was offered the privilege to provide a first usage test and report for a new body powered device. This device allows an "on the fly" switch between VC (voluntary closing) and VO (voluntary opening) control mode.

If you use a prosthetic arm recreationally, for fun, for "the little things that count", such as opening the odd envelope, holding the odd water bottle while filling it with tap water, or pushing the odd knob on your coffee machine, then it probably does not matter what device you wear, or how it would hold up. But if you usually demand performances of your prosthesis that are in the domain of the "unreal", the difficult to cover for existing devices, then having a terminal device that allows on the fly switching between these two control modes really is a big thing. It means that I can switch between the most popular passive grasp mode (VO) - used to carry or hold on to items without thinking - and the most powerful dynamic and forceful grasp mode that ever exists for prosthetic arms (VC).

The device is called "Equilux" and it is (or will be) manufactured by Toughware PRX.

Toughware PRX
2514 West 104th Circle
Westminster, Colorado 80234-3508
Telephone:303-635-1619
FAX:303-635-1621
E-mail: info@toughwareprx.com

An outstanding feature is that the device also provides for the fact that normally, VO works better with slightly longer control cables, whereas the VC system requires mildly shorter ones. This device's flip / switch design does away with this by way of clever design. So with one good control cable length, you are set.

As a further feature, it contains an interface for exchangeable grip pads. As we will see, this is a relevant aspect, that will have to be followed up in the future.

QR code for this post:

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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_1571242946, 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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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_1571242946, 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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Retro [hook device review]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Retro [hook device review]; published November 14, 2013, 06:39; URL: https://www.swisswuff.ch/tech/?p=2298.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Retro [hook device review]}}, month = {November},year = {2013}, url = {https://www.swisswuff.ch/tech/?p=2298}}


The prosthetic device choices currently is restricted in that there are hardly any new developments that deserve the tag "ground breaking".

With the notable exceptions of the V2P Prehensor and now the Retro, both by Bradley Veatch [Toughware PRX].

The Retro is priced at 600 USD, so the question is, what do we get for the money.

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V2P - grip strength and grip geometry - Gecko Skin

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P - grip strength and grip geometry - Gecko Skin; published February 24, 2011, 19:02; URL: https://www.swisswuff.ch/tech/?p=385.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P - grip strength and grip geometry - Gecko Skin}}, month = {February},year = {2011}, url = {https://www.swisswuff.ch/tech/?p=385}}


Whereas one may try to optimize grip quality by increasing finger control and grip geometry sophistication with over-underactuation, increased amount and thus weight of electronics and batteries, increased risk of failure and breakage due to increasingly finely structured constructions of endless sophistication, grip quality itself is a different subject. Not altogether, but somewhat. Due to that, grip optimization also is a somewhat different subject.

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V2P Prehensor / PUPP+CH+EN wrist > ADL Activities of Daily Living > The Very Profane > Push Comes To Shove > Cleaning Toilet

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P Prehensor / PUPP+CH+EN wrist > ADL Activities of Daily Living > The Very Profane > Push Comes To Shove > Cleaning Toilet; published July 22, 2010, 00:16; URL: https://www.swisswuff.ch/tech/?p=339.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P Prehensor / PUPP+CH+EN wrist > ADL Activities of Daily Living > The Very Profane > Push Comes To Shove > Cleaning Toilet}}, month = {July},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=339}}


1 Comment

What Otto Bock, RSL Steeper or TouchBionics always try to withhold from us are the bare facts of life, the profane tasks. But that's quite alright, I am sure we can get them up to date somehow.

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V2P Prehensor - fixing broken rubber abutment

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P Prehensor - fixing broken rubber abutment; published June 2, 2010, 19:20; URL: https://www.swisswuff.ch/tech/?p=313.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P Prehensor - fixing broken rubber abutment}}, month = {June},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=313}}


My plastic slider / abutment broke after about two months of relentless usage.

The next test was whether this could be fixed without high tech. Can the V2P Prehensor be put back to good use at the next hardware store and just for a few bucks?

Yes, for sure :)

...
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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_1571242946, 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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V2P Prehensor - activities of daily living ADL - vacuum cleaner operation

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P Prehensor - activities of daily living ADL - vacuum cleaner operation; published February 1, 2010, 02:37; URL: https://www.swisswuff.ch/tech/?p=275.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P Prehensor - activities of daily living ADL - vacuum cleaner operation}}, month = {February},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=275}}


1 Comment

Vaccum cleaner handling. A simple task, but not too easy on the grip. This one has been utterly failed by a number of devices by Otto Bock and it is a bitch to do without wearing a prosthesis. The Becker Lock Grip is not bad here but the V2P Prehensor literally glues to my vacuum cleaner's brush part that I am cleaning.

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V2P Prehensor - nitrile glove fingers as winter tyres

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P Prehensor - nitrile glove fingers as winter tyres; published January 6, 2010, 18:18; URL: https://www.swisswuff.ch/tech/?p=258.

BibTeX: @MISC{schweitzer_wolf_1571242946, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P Prehensor - nitrile glove fingers as winter tyres}}, month = {January},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=258}}


To allow for a firm rubbery cover that I can cheaply replace I removed the factory issue rubber that covered the V2P Prehensor claws and cut up nitrile glove fingers (make: Atlas 370).

Here's how.

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