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Fabricating Electrodes into the Inner Socket
Once electrode sites have been marked on the plaster cast, place the
electrode dummies on the cast and check to make sure they lay flat against
the plaster surface. Make sure the surface of the electrode dummy marked
"CAST SIDE" is placed against the plaster cast (see image).
The figure shows the dummy with the cast side in the correct orientation,
and the dummy lying flat on the cast surface
CAST SIDE - NOT VISIBLE
WHEN INSTALLED
CAST
If the electrode dummy does not lay flat on the plaster surface, mark an
outline of the electrode, remove the dummy and sand down the surface
inside and near the outlined mark. Clear the area of debris and place the
electrode dummy again.
Note 1: The electrode is designed to properly seal only on flat surfaces. If the
area is not flat, the electrode will not seal completely.
Note 2: Make sure that the side of the dummy without the extended edges is
in contact with the cast, as shown.
Secure 2 of the nails provided (14ga or 15ga standard nails, roughly 1/2"
long) through the two holes in the electrode dummy to the cast. Alternatively,
you may use thin double stick tape to secure the dummy to the surface of
the cast.
CAST
TOP SIDE
CAST
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We strongly recommend using one of the techniques below to ensure the
plastic is drawn around the dummy uniformly:
•
When creating the cast, use a parachute string or straw that runs from
the location of the dummy to the proximal end of the plaster. This creates
an air channel from the proximal end to the dummy.
•
After forming the cast, drill a hole into the plaster under each dummy to
the center rod of the cast.
•
Use a balloon on the cast and poke pin holes in the balloon around the
dummy to allow airflow.
Inner Socket Fabrication
IBT Electrodes are designed to fit in a self-retaining pocket that is formed into
the inner socket using the provided electrode molding dummies. The same
dummies can be used for vacuum-forming thermoplastic inner sockets and
rolled silicone inner sockets. The following instructions go over standard
methods for both material types.
Socket fit is imperative to successful pattern recognition control.
WARNING: Do not use the actual Sense Controller and IBT Electrodes
during the socket fabrication and lamination process, as it will damage
these components. Please use the provided dummies instead.
Inner Socket Fabrication - Thermoplastic
Place the cast with the installed dummies in the vacuum setup. Tie the base
down.
Place hot material over the positive plaster while applying vacuum. Press
around the edges of the electrode dummies to ensure the material has
formed around all the overhanging edges of the electrode dummy.
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