Össur CHOPART Mode D'emploi page 4

ENGLISH
CHOPART FOOT PLATE (Figure 1)
• Uses a single carbon plate for direct lamination
• Build height 6 mm (1/4'')
• Available in sizes 23–30 cm
• Not available in split toe version
BENCH ALIGNMENT (Figure 2 & 3)
• Adjust to appropriate heel height (using the shoe).
• Introduce appropriate socket angles flexion/extension and abduction/
adduction.
• The load line taken from the center of the socket should fall through
the midline of the foot module in a neutral M-L position. Depending
on proximal or distal bearing socket design, use appropriate load line.
• Set appropriate toe rotation.
• Divide the foot into 3 equal portions.
• The load line should fall at the junction of the posterior and the
middle third portions.
CHOPART INITIAL FITTING PROCEDURE
Preparation
From bench alignment, chopart foot plate should be bonded to the distal
socket with potting epoxy or Siegelharz.
• Roughen carbon fiber surfaces (upper plate and socket) and clean
with acetone to ensure best adhesion of epoxy or lamination.
• While in alignment jig, raise socket on the plate and lower unit back
in place.
• Fill in around the outside edges with potting epoxy to create a smooth
transition from the socket to the plate.
• Wrap with synthetic casting tape.
• Carry out dynamic alignment and make changes as necessary.
• During dynamic alignment you may cut off the tip of the heel and
replace with soft foam material (Figure 4).
Dynamic Alignment
The roll over action of the foot can be influenced by the heel and the
shape of the sole.
• Secure achieved dynamic alignment using a jig.
• Remove sole materials and synthetic casting tape and proceed to
direct lamination.
Lamination Procedure
• The lay-up sequence involves posterior and M-L positioned carbon
fiber cloth.
• Apply on posterior layer, then follow with a M-L layer.
• Continue to alternate using the required number of layers. The long
posterior layer is folded in half over the M-L layer and reflected
backup to the socket to form a T layup, locking the layers together
and producing a clean lamination edge (Figure 5).
• Seal the not laminated part of the plates with tape.
• Pull a PVA bag over the prostheses and laminate with acrylic or epoxy
resin.
• After lamination has set, sand off any protruding edges.
• Do not cut into the lamination.
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