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Category: V2P Prehensor

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_1569175373, 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]

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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_1569175373, 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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V2P - grip strength and grip geometry - Gecko Skin

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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_1569175373, 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 - general reflection on grip strength and test of multi layered customized claw covers

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P Prehensor - general reflection on grip strength and test of multi layered customized claw covers; published July 26, 2010, 01:29; URL: https://www.swisswuff.ch/tech/?p=342.

BibTeX: @MISC{schweitzer_wolf_1569175373, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P Prehensor - general reflection on grip strength and test of multi layered customized claw covers}}, month = {July},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=342}}


After reading a scientific article about grip strength, after reflecting about my current experience, I figured it was time for an update on grip strength.

Based on a very nice article of Markenscoff et al. (1990), it becomes clear that to securely grip an object in three-dimensional space one requires a rather large number of fingers if there is no friction at all.

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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_1569175373, 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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Hot Summer - trimming the hedge [V2P / Puppchen wrist real life test: passed]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Hot Summer - trimming the hedge [V2P / Puppchen wrist real life test: passed]; published July 16, 2010, 12:13; URL: https://www.swisswuff.ch/tech/?p=333.

BibTeX: @MISC{schweitzer_wolf_1569175373, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Hot Summer - trimming the hedge [V2P / Puppchen wrist real life test: passed]}}, month = {July},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=333}}


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With around 35 degrees C and sunshine, I figured it was time to trim my hedges. It's a pride and show performance thing to do that myself. So I did.

I applied ample antiperspirant spray on my stump first. That would be to limit sweating underneath the silicone liner. I was not in the mood to go back and forth cleaning the stump from profuse sweating.

Then I taped the safety latch of my machine into the "pressed" position to allow for left-handed only operation (don't try this at home, kids).

After that I went for it, using a V2P Prehensor (this time a model made from very sturdy plastic) and one of our new PUPP+CH+EN wrist units.

The work contained two hours of full height trimming (ground to overhead level) in full summer sun / heat.

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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_1569175373, 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_1569175373, 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_1569175373, 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_1569175373, 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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V2P prehensor - first look

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - V2P prehensor - first look; published January 5, 2010, 20:15; URL: https://www.swisswuff.ch/tech/?p=246.

BibTeX: @MISC{schweitzer_wolf_1569175373, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - V2P prehensor - first look}}, month = {January},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=246}}


This is a first comment on features of the new V2P Prehensor designed and built by Bradley Veatch (Physionetics / ADA Technologies). One of the best features is that right out of the box this prehensor looks great - I got compliments for wearing high tech that was consistently valued higher than a human hand shape. And that right out of the box this allows tweaks and improvements such as my winter tyres that I put on.

Previous works to study:

  • Hooks are without question important, and Dr Harold Sears' doctoral thesis highlights the use of a hook design with wider claw surfaces. So far, I have not seen this idea put into practice. Until now. The V2P has wide claw surfaces.
  • The Trautman hook precedes some of the design elements found here such as a non-curved hook grab part and wide round claws - but the V2P is just so much more beautifully and powerfully done.

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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_1569175373, 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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Physionet V2P prehensor by ADA Technologies, Inc.

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Physionet V2P prehensor by ADA Technologies, Inc.; published March 13, 2009, 11:48; URL: https://www.swisswuff.ch/tech/?p=138.

BibTeX: @MISC{schweitzer_wolf_1569175373, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Physionet V2P prehensor by ADA Technologies, Inc.}}, month = {March},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=138}}


1 Comment

After all that we had discussed in June 2008 - cable ball connector, spring settings and their modifications, the new Otto Bock MovoHook that I got a bit later, and Brad who asked for photos of the MovoHook - it seems that Bradley Veatch released a new hook through PhysioNetics through ADA Technologies.

This interesting product termed V2P prehensor seems to feature near car-lifting strength spring setting, and looks like the Hummer of All Hooks or even a weapon. I like its appearance but the ultimate interest is in its function. The V2P also features non-linear spring settings.

I now use a pimped version of the Otto Bock MovoHook and a new wrist joint that we built ourselves (currently MSM wrist 0.1-rev, details freely available for download if you want to build one as well), and that covers all aspects of my daily situations with some rare exceptions that are probably inherent to hand prosthetics rather than a specific solution. Most notably, the MovoHook contains two sufficiently useful spring settings, looks like a conventional hook, features a rather optimized and refined hook claw shape and is quite lightweight.

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