3D printer for personalised orthotic devices

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Discussion Overview

The discussion revolves around the use of 3D printing technology for creating personalized orthotic devices, exploring its potential benefits in terms of cost and efficiency compared to traditional methods. Participants examine the implications of additive manufacturing in the design of foot and ankle orthoses, as well as the material limitations and possibilities for strength and durability in the printed devices.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants express enthusiasm about the potential of 3D printing to reduce costs and time in creating personalized orthotic devices.
  • Concerns are raised regarding the strength and brittleness of the materials currently used in 3D printing, particularly for applications requiring durability.
  • One participant mentions the use of a low-budget 3D printer that produces strong pieces, suggesting that material selection can impact the outcome.
  • Another participant discusses the limitations of materials in 3D printing, noting that current options are primarily plastics and polymers, while also mentioning advanced techniques for metal printing that may be cost-prohibitive.
  • A proposed method for creating metal parts using 3D-printed molds through a casting process is outlined, highlighting an alternative approach to achieving high-quality components.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the material limitations of 3D printing for orthotics, with some expressing optimism about the potential for stronger materials while others highlight existing challenges. The discussion remains unresolved regarding the best materials and methods for producing durable orthotic devices.

Contextual Notes

Participants acknowledge the evolving nature of 3D printing technologies and materials, indicating that current limitations may change as research progresses. The discussion also reflects varying levels of expertise and familiarity with 3D printing applications in medical devices.

Ryan_m_b
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Orthotics are externally applied devices that modify the structure and function of muscular and skeletal systems. They help patients with a variety of conditions from fracture recovery to degenerative diseases like spina bifida. Personalised devices can take months to hand craft and be quite expensive for the health service but research like this promises to not only speed up but lower the cost. I'm not much of a medical device guy but stuff like this really excites me. Such a simple solution that could help so many patients without costing an arm and a leg.

Embracing additive manufacture: implications for foot and ankle orthosis design.
Telfer S, Pallari J, Munguia J, Dalgarno K, McGeough M, Woodburn J.
BMC Musculoskeletal Disorders. 2012;13:84
http://www.biomedcentral.com/1471-2474/13/84/abstract

3D printer 'could help millions walk', say researchers
http://www.bbc.co.uk/news/uk-scotland-20031657
 
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Interesting. I've been told by our MEs that the 3-D printers we use here at my work have a limitation in the materials that can be used -- one of the limitations is that the final plastic pieces are not very strong, and are a bit brittle. I wonder if there are other materials that are compatible with the 3-D printing processes that have higher strength and toughness. It would seem that orthotics would need to be fairly strong, depending on the application...
 
I have a friend who builds repraps (a low budget 3D printer) with his reprap. The pieces that come out are pretty strong; you can select a variety of plastics for extrusion.
 
The range of materials that can be used and the techniques to "cure" them, are still developing, but AFAIK the materials are limited to plastics and polymers.

There are research projects effectively doing "3D printing" of metal objects, using a computer controlled electric welder to build a solid object entirely from welding wire (Google for "shaped metal deposition") but that is probably outside of your price range.

You could consider using a 3D-printed object to create a mould for casting a metal part, using the "lost wax" casting process. The basic idea is
1. Make the 3D shape from a low melting point material
2. Spray coat it with a material (e.g. a ceramic) that can withstand the metal casting operation.
3. Remove the original material by melting it out of the ceramic mould.
4. Cast the object in metal.

This can produce very high quality components (both surface finish and material properties) from any castable material. You might be able to find a specialist foundry that can work from your 3D printed parts.