Sunday, October 27, 2013

More applications

    Aerospace, automotive, defense, test facilities, industrial machines, marine, nuclear, rail.
  • AEROSPACE Satellites, launch vehicles, space shuttle, morph technology.
  • AUTOMOTIVE Crash test barriers, door and roof panels, double-skinned exhaust manifolds, fairings, heat exchange panels, flexible fuel tank, motorcycle fairings.
  • AVIATION Ailerons, cowlings, doors, flooring, flaps, radomes, rudders.
    arterial stent technology, artificial extra-cellular matrix, capsid engineering. Hernia mesh prosthetics.
  • CONSTRUCTION architectural panels, concrete reinforcement in earthquake prone areas, false ceilings, flexible tubular structures, insulation curtains for hazardous material removal, roof panels, wall panel. 
    MARINE bulkheads, bunks, covers, decks, double skinned hulls, hatches, wave energy framework. 
    MISCELLANEOUS dirigibles, double-skinned oil tanks, flexible body armor, oil pipelines, piping / ductwork with interstitial space, radio frequency shielding, soil stabilization mat, solar energy panels, sound attenuation panels. 
    RAIL Ceilings, doors, energy absorbers/bumpers, floors, partitions. 
    RECREATION INDUSTRY athletic shoes, motorcycles, surfboards, snowboards, tent walls, toy, wake board.
    RESEARCH morphing wing concept, nanotechnology, robotics. 

Tuesday, July 30, 2013

New Concept in the Design & Manufacture of a Prosthetic Latticework.


The use of mesh has become essential in the repair of all hernias. To move forward into a new era of hernia mesh prosthesis  a panel of nine experts in hernia repair and experimental mesh evaluation agreed that new technologies and novel approaches must be investigated and designed.

The aim of this paper is to propose, a new concept in the design & manufacturing of a prosthetic latticework for inguinal, ventral or incisional hernia repair.

The 'smooth' side, having a small pore size, is placed adjacent to the bowel and resists tissue attachment.

The unique geometry of the lattice allows it to stretch in more than one direction and then return to its original shape. Existing hernia meshes are made of relatively stiff and inelastic material. The author strongly believes that these characteristics may be a contributing factor for recurrences and patient discomfort.
The proposed lattice easily assumes the conformity of the abdominal wall musculature anatomy and thus improves the long term comfort and well-being of the patient.

 The 'rough' side, with a more open pore size, is next to the tissues that surround the bowel where tissue incorporation is an advantage. Lattice cell size of 4mm (5/32nds) and thickness of 2mm (5/64ths). Lattice width of 150mm (6”).

The method of manufacture of this surgical lattice is using 3D printing technology. First, a three-dimensional structure is designed using CAD software. The porosity can be tailored using algorithms within the software. The lattice is then realized by using ink-jet printing of polymer powders or through Fused Deposition Modeling of a polymer melt.
The basic materials could be:
• ePTFE. (Expanded polytetrafluoroethylene) The use of ePTFE surfaces in hernia repair reduces adhesions and would reduce the recurrence rate.  This would be the first layer that is printed (smooth side down)
• Polypropylene. This material has been used for the past 20 years because of its stability, strength, inertness and handling qualities. Polypropylene is overprinted on the PTFE layer and provides the basic structure of the lattice.
• Collagen. A final layer of collagen is printed to encourage speedy host tissue incorporation into the latticework.

Potential attributes of lattice.
1. May result in the permanent repair of the abdominal wall, to reinforce and replace tissue for long-term stabilization of the abdominal wall.

2. Ingrowth characteristics that mimic normal tissue healing. May stimulate adequate fibroblastic activity for optimum incorporation into the tissues. May prevent adhesions. The ePTFE protects the edge of the lattice minimizing tissue attachment to the material.

3. Strong. May provide sufficient biomechanical strength to meet physiological requirements in order to permanently protect the fascial defect.

4. Pliable. It has elasticity in more than one dimension, allowing it to stretch in more than one direction and then return to its original shape. Easily assumes the conformity of the abdominal wall musculature anatomy.

5. Handling characteristics should be amenable to laparoscopic instruments.

6. The lattice may have an adequate adhesive quality that requires minimal or no additional fixation, even for large defects.

7. Non-allergenic.

8. Inert.

9. Non-biodegradable.

10. Non-carcinogenic.

11. Cuts easily without fraying.

12. The dimensions and mechanical properties of the proposed lattice can be tailored to provide an effective portfolio of hernia prostheses.

13. No shrinkage

CAD/CAM Technologies.
A number of different methods have been described in literature for preparing porous structures to be employed as tissue engineering scaffolds. Each of these methods presents its own advantages, but none are free of drawbacks.
Because most of the above techniques are limited when it comes to the control of porosity and pore size, computer assisted design and manufacturing techniques have been introduced to tissue engineering.

Monday, January 7, 2013


Yishu Dai 
I still don't' get the concept of hexaflex though, why are we trying to find them, and what's special about them that we're trying to find them?
January 1 at 11:26pm · Like

Bob Burdon 
Welcome to all of my newly acquainted friends and visitors. 
Thank you all so much for joining this group of "Think Tankers" . De Bono would be proud!

Our Quest is to find this honeycomb lattice which I call HEXAFLEX.

This design is elegant and simple in its construction.
Yet for all of its geometrical simplicity it had never been discovered until I serendipitously found it 5 years ago. 

That fact alone is staggering

In that time, with the help of my good friends David, Janice, Kelvin and Seth, a patent was granted in June 2009.

We have identified many possible applications for Hexaflex but there is one thing which continues to elude us.


For all our skill and technological prowess, human engineers still can't match Mother Nature's best designs. Her designs are always simple and elegant

In order to help us focus on this quest I am gathering a collection of images of all natural things which have a degree or two of hexagonality about them. By carefully analysing these images we may gain a clue.

I believe that this geometrical discovery has great significance in science. It could be the precept to precipitate a concept to finally precipitate a paradigm. 

This quest will open a door into another world of possibilities.
We may find its existence in the human body. 
Perhaps it exists in the nanoworld .
Perhaps its the Herpes virus capsid.

Perhaps in your own field of interest/profession you may know where Mother Nature's uses Hexaflex.
Perhaps we could grow stem cells on it.
Perhaps a true mechanical skin.
Perhaps..............Fill in the blank.
Time to flex brain muscles!

Given all the potential of Hexaflex, it is exciting to imagine how this structure will be utilized in the future.

Feel free to explore all aspects of this site. Scroll down to 'Photos' and click on 'See All'. If you are enthused by any particular photo in the album and have a comment that you would like to leave then please feel welcome.
Positive or negative, leave a link, leave a video, upload photos. 
Our think tank will surely reach a critical mass of thoughtful input. 
Feel free to invite your friends to our group. 
January 1 at 11:30pm · Like

Yishu Dai 
thank you i did read this, but i'm so confused about how exactly this design is helpful
January 1 at 11:44pm · Like

Bob Burdon 
To find this exact latticework in natural engineering has been the aim of this quest. 
It has unique properties. 
This latticework is governed by a simple geometrical pattern of rectangles with hexagons. The pattern of the layout evolves from the three dimensional geometric tessalation of rhombic dodecahedrons. This pattern allows this two-dimensional pattern to be folded, concertina style, into the third dimension. 
It is based on pure geometry. 
With that in mind, it became my belief that this latticework had to exist somewhere in Mother Nature's toolbox. 
To date, with a limited number of 3D printed prototypes it can model all the allotropes of carbon. As a molecular modelling kit it has the potential for furthering both research and discovery in nanotechnology where I believe it was hiding all along. 
It mimics the surface of a scale on a butterfly wing.....that could be a line of good enquiry and research.
This design makes an amazing toy for both kids and adults. Our consciousness expands to fill whatever you live in. This toy design is helpful in weaning us away from cubic mentality which can turn us into blockheads. This toy intergrates with LEGO ….call it serendipity.
We live in a carbon world.