expletive-ethereal
expletive-ethereal
expletive-ethereal
expletive-ethereal

Category: Prosthetic wrist connector

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_1571329333, 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]

Read More

#userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - #userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]; published October 2, 2016, 13:05; URL: https://www.swisswuff.ch/tech/?p=6342.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - #userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]}}, month = {October},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6342}}


PDF of poster presentation @ Cybathlon Symposium Oct 06 2016 @ Kloten.

Read More

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_1571329333, 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.

Read More

WILMER Prosthetic Product Line [University of Delft]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - WILMER Prosthetic Product Line [University of Delft]; published June 6, 2011, 00:05; URL: https://www.swisswuff.ch/tech/?p=428.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - WILMER Prosthetic Product Line [University of Delft]}}, month = {June},year = {2011}, url = {https://www.swisswuff.ch/tech/?p=428}}


A useful development is presented here: new body powered socket and gripper technology primarily aimed at children.

This development appears to avoid the 'single individual or competitive company charging into patent market derailment with a stalled / stalling product'. The thing is that rare / orphan disease rules play out. It is not acknowledged by many but the clever players play by these rules, for sure. Because one thing is for sure - below elbow amputees are rare - only half wear prosthetic arms - about half of which are probably body powered. Those are so few out and far that economic laws of free markets neither work nor play out. With any new patented invention you won't change shit. Rather, people that use conventional marketing of their usually not too inventive products are responsible for stale product ideas and stale products, for immature developments and bad manufacturing. Commercial prosthetic arms are one big proof for the term 'stale' - look around and ponder. Patent applications are harmful and keep products or solutions from the market for another few years until - how so often - just about nothing really happens. But, not here.

The Delft University of Technology is a government supported institution that works on a whole line setup that appears to be well researched and solves actual problems. Solutions are published and made available. Great stuff.

Read More

Request For Information [prosthetic wrist]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Request For Information [prosthetic wrist]; published May 28, 2011, 07:28; URL: https://www.swisswuff.ch/tech/?p=415.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Request For Information [prosthetic wrist]}}, month = {May},year = {2011}, url = {https://www.swisswuff.ch/tech/?p=415}}


Check out this.

I submitted our (non-powered) prosthetic wrist so they can check it out. What I don't get is the externally powered 3 DOF idea for body powered arms - a feature I would never have figured anyone would ever need. But, hey : ) It really seems like no one - no one - today is able to create a research project that avoids batteries and gadgetry. Obviously, the amputee of 2011 in their eyes necessarily must create motor sounds, and go "uaa uaa" at the slightest notion of moving their parts.

Well, if it makes these people happy, be it : )

https://www.fbo.gov/index?s=opportunity&mode=form&id=91ad23b87c9e1b9a1184180f27610b7b&tab=core&_cview=0

:
W81XWH-PRORP-RFI
:
Special Notice
:
Added: May 18, 2011 1:34 pm

This is a Request for Information (RFI) Only!

Issued for: The Peer Reviewed Orthopaedic Research Program (PRORP), Congressionally Directed Medical Research Programs, United States Army Medical Research and Materiel Command

Background: The Peer Reviewed Orthopaedic Research Program was established within the Defense Health Program of the Department of Defense to support research focused on optimizing recovery and restoration of function for military personnel with orthopaedic injuries sustained in combat or combat-related duties. The PRORP is considering offering program announcements to solicit for mature translational and clinical trial research projects, and is issuing this RFI to survey available and/or emerging biomedical technologies that have the potential to address the following focus areas of interest:

A. Prevention and treatment of post traumatic osteoarthritis: Post traumatic osteoarthritis is the most common chronic, debilitating condition of combat-injured Warriors. Most incidences of post traumatic osteoarthritis are caused by fractures involving the joints. The PRORP is interested in mature translational and clinical research aimed at preventing or treating this condition. Preventive measures must consider the battlefield environment constraints (to include but not limited to multiple serious injuries, anticoagulation effects of medication, and limited imaging capabilities for the first 72 hours). Regenerative approaches must be able to repair large cartilage defects that current therapies (such as microfracture and osteochondral transplantation) do not address.

B. Improved outcomes of severe limb injuries: The majority of combat-injured Warriors have at least one extremity injury, most of which are open wounds caused by explosion or gunshot. These injuries are generally more severe than civilian injuries, with infection and nonunion as common complications. Nonfunctional nerves and loss of muscle function are frequent outcomes. Clinical studies on approaches to reduce or treat infection, therapies that heal large motor nerve injury, and novel rehabilitation interventions or orthoses that improve the functional outcomes of individuals with severely injured limbs are needed.

C. Improved outcomes of multi-limb trauma patients: Combat casualties facing multiple major limb amputations or severe limb-threatening injuries requiring salvage techniques represent a small but very important subset of patients. Clinical studies to examine surgical, rehabilitative and psychosocial aspects of coping with and returning to life afterwards; as well as treatment strategies to improve outcomes in these specific patients will be considered.

D. Upper Extremity Prosthetic: Combat-injured Warriors that have lost one or both arms have limited options in reliable prosthetics that are lightweight, easy to control, and flexible. The PRORP is interested in advanced technology that could be used to develop and test a modular, interoperable, three-degrees-of-freedom (DOF), powered prosthetic wrist and one DOF terminal device with accompanying control strategies. Of highest interest is technology that solves unmet clinical needs, with priority given to function, weight, reliability, and durability, rather than cosmetic appearance. Interest is in candidate solutions and prototype systems at the stage of refinement and initial feasibility testing or beyond.

Information Requested: To respond to this RFI, please address the following questions. It is requested that each response address a single focus area. If you would like to comment on multiple focus areas, you are encouraged to submit multiple responses.

1) What novel approaches that meet the above focus areas are sufficiently developed for clinical trial research? Please describe any relevant research of which you are aware, with brief details about each therapeutic or preventive intervention, and the stage of clinical development in progress. If relevant, include information on Investigational New Drug or Investigational Device Exemption status.

2) What novel approaches that meet the above focus areas are not yet ready for clinical trial, but are considered to be at a mature translational research stage? Briefly describe each relevant approach, including status of any animal or observational/clinical validation, technology development, and manufacturing progress. Estimate time needed for additional research and development before clinical trial readiness.

3) With regard to upper limb powered prosthetic solutions, please describe current capabilities to assemble a modular three DOF wrist, specifying the size and weight footprints of each possible configuration in order to evaluate the limitations for fitting based on residual limb length. Briefly describe design of the terminal device and accompanying powering technology. Describe any approaches that capitalize on and augment the features of existing body-powered devices to create an evolutionary externally powered product. Discuss the modularity of the system both in terms of physical assembly and control capability. Responses should include information on the extent to which each technological component of the system has been proven, as well as compatibility across other prosthetic systems and manufacturers.

Response and Process: To facilitate review of responses, please clearly mark which of the above focus areas is relevant to the response. Please respond no later than June 8, 2011. Responses should be limited to 500 words or less, and can be submitted to cdmrp.prorp@amedd.army.mil. No telephone calls please.

NOTE: This RFI is issued solely for information and planning purposes and does not constitute a solicitation or issuance thereof. All information received in response to this RFI that is marked proprietary will be handled accordingly. Responses to this RFI will not be returned. Responses to this RFI are not offers and cannot be accepted by the Government to form a binding contract or award. Responders are solely responsible for all expenses associated with responding to this RFI.

:
US Army Medical Research Acquisition Activity, ATTN: MCMR-AAA, 820 Chandler Street, Frederick, MD 21702-5014
:
Susan Dellinger, 301-619-2090

US Army Medical Research Acquisition Activity

Robo-Flex PL wrist by Medical Bionics

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Robo-Flex PL wrist by Medical Bionics; published September 19, 2010, 23:21; URL: https://www.swisswuff.ch/tech/?p=354.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Robo-Flex PL wrist by Medical Bionics}}, month = {September},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=354}}


There is a new type of spherical lock out and it seems that this lock now also is sold as prosthetic wrist joint.

Read More

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_1571329333, 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}}


1 Comment

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.

Read More

PUPP+CH+EN Wrist 1 released

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - PUPP+CH+EN Wrist 1 released; published July 10, 2010, 10:59; URL: https://www.swisswuff.ch/tech/?p=330.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - PUPP+CH+EN Wrist 1 released}}, month = {July},year = {2010}, url = {https://www.swisswuff.ch/tech/?p=330}}


Currently, my friends who built my wrist units along the MSM series now release this product for sale:

Photo5k

Product information:

http://www.puppchen.com/

Terminal device bolts, Otto Bock norm, 1/2-20 UNF thread

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Terminal device bolts, Otto Bock norm, 1/2-20 UNF thread; published December 22, 2009, 20:11; URL: https://www.swisswuff.ch/tech/?p=247.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Terminal device bolts, Otto Bock norm, 1/2-20 UNF thread}}, month = {December},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=247}}


The standard Otto Bock wrist uses a sub-16.000mm cylindrical bolt. Our own wrist units adapt to that. The V2P - as well as other US-American terminal devices - ships with a 1/2-20 UNF threaded bolt.

What to do?

Read More

MSM wrist 0.2 [prototype]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - MSM wrist 0.2 [prototype]; published October 29, 2009, 11:47; URL: https://www.swisswuff.ch/tech/?p=234.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - MSM wrist 0.2 [prototype]}}, month = {October},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=234}}


Our first prototype (also check the road map) had to be wiggle free, be rock sturdy and be fast to produce.

Our second prototype now is the type of lock that I always wanted - sleek, rock solid and superbly functional.

Functions:

  • Lift as much weight as my silicon liner can transmit on the arm.
  • No wiggle.
  • Switch any rotational position and switch it fast

Read More

MSM wrist [legal aspects - file download area]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - MSM wrist [legal aspects - file download area]; published April 8, 2009, 15:01; URL: https://www.swisswuff.ch/tech/?p=159.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - MSM wrist [legal aspects - file download area]}}, month = {April},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=159}}


2 Comments

Always, developments with new ideas cause people to get interested in the legal and constructional aspects. The MSM wrist information is posted here.

Read More

MSM wrist [road map]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - MSM wrist [road map]; published April 8, 2009, 14:57; URL: https://www.swisswuff.ch/tech/?p=158.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - MSM wrist [road map]}}, month = {April},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=158}}


8 Comments

We started to develop a wrist joint - or a mechanical wrist joint - for my cable controlled arm prosthesis (or body powered arm prosthesis). The wrist joint should contain a quick release mechanism to allow fast switching of hook, hooks, hands, terminal devices, experimental tools or anything of that nature.

If you are interested in the time line of previous and future developments of our MSM wrist, here's the right place to check.

Contact me for further details (email address ~ wuff *@@@* swisswuff.ch).

Read More

MSM wrist 0.1-revision [open prosthetics]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - MSM wrist 0.1-revision [open prosthetics]; published April 8, 2009, 14:51; URL: https://www.swisswuff.ch/tech/?p=157.

BibTeX: @MISC{schweitzer_wolf_1571329333, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - MSM wrist 0.1-revision [open prosthetics]}}, month = {April},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=157}}


4 Comments

After an initial prototype was built and after I used it for a while, two major inconveniences (1: inbus screw issue; 2: cable pull direction has to match sprocket design issue) became apparent.

Since our roadmap currently does not provide for a new major MSM wrist release in the near future and since Otto Bock has not announced a comparably sturdy design, we decided to move towards fixing the MSM wrist 0.1 prototype's initial issues.

Read More

Do NOT follow this link or you will be banned from the site!
HTML Snippets Powered By : XYZScripts.com
I footnotes
x2