RESPONSES: Socket Duplication

John T. Brinkmann

Description

Title:

RESPONSES: Socket Duplication

Creator:

John T. Brinkmann

Date:

4/3/2007

Text:

Many thanks to all who responded to my question about duplicating a Symes.
   
  ORIGINAL QUESTION
   
  Does anyone know of a way to duplicate an existing Symes (or any significantly bulbous) socket without necessitating cutting of the socket to remove it from the mold? I'm concerned that alginate would be too soft and a Duplicone too rigid. Ideally, I'd like to be able to transfer the alignment, but the priority is duplication of the socket contours.
  John Brinkmann, CPO, LPO, FAAOP
   
  Most Common Responses
  1. Otto Bock duplicating plastic/foam (Pedilan). I’ve ordered the material and will be trying this first.
  2. Renew Replicator silicone www.renewmaterials.com; Available through SPS or Kingsley. Expensive compared to O. Bock’s Pedilan, but seems like a good option.
  3. Digitization using a wand (Tracer CAD)
   
  Below are some of the detailed responses that include tips:
   
  Start with 2 or 3 layers of O.B. duplicating foam. After the foam sets
  you can deform it and remove from the socket. Mix light plaster and
  pour into the duplicating foam shell. Roll the plaster around inside it to
  coat the foam and create a rigid wall. You may need to do the light
  plaster treatment several times. When the foam/plaster walls are rigid
  enough, you can insert a pipe and fill the shell with plaster. Seal the
  foam and fabricate as needed.
     

   
    I use alginate with vermiculite aggrigate and a long pipe. If you vaseline the socket, it should pull out and still be fairly rigid. Must have a pipe all the way to the bottom.
   

   

I've great results with alginate, when doing something like a symes,

I take a 1x2 piece of wood long enough to goe all the way through to

where the socket becomes bulbous. I lubricate the wood with vaseline. The

alginate should be thick and let to set really well. I'll then remove the wood

from from the alginate while it is still in the socket. The empty space

left from the wood will compress and the alginate come out of the socket

without elongating it. I then reinsert the wood and wrap the alginate with
  
rigid plaster. This has worked more than once over the years.

 

   

Use duplicating plastic from Otto Bock. It uses the same hardener as

Their rigid foam. You need to use their separator, otherwise the duplicating

plastic will stick to the socket. Keep the distal end thickness to less

than half an inch and it will come out quite easily. Let the material sit

for a day and it will stiffen up nicely. Be careful not to let the material

deform before its' full cure. If you lean it against something it will distort
  
overnight.

 


 

When we alginate, we tape loops of sanding screen at various

points on the pipe. After the alginate dries, remove the socket while

holding it vertically allowing the alginate to elongate. Remarkably the
  
screen holds the alginate!

 

   
   

 
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Citation

John T. Brinkmann, “RESPONSES: Socket Duplication,” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 2, 2024, https://library.drfop.org/items/show/228132.