Fabricating The Plaster Model - Otto Bock Harmony P3 Technical Information

Procedure
Required tools and materials
• Plaster bandages, plastic film, 2x 99B25 nylon stockinette or 623T3=* Perlon stockinette, 683G1=* latex cast­
ing bag, 755Z19=230 vacuum pump

3.3 Fabricating the plaster model

Objective
To fabricate the plaster model, the plaster cast is removed from the residual limb and filled with plaster. The plaster
model is then reduced according to the requirements of the prosthetic socket.
INFORMATION
► Keep the shape of the plaster model unchanged during all reduction steps.
10 | Ottobock
Instruct the patient to tense the residual limb muscles
briefly. Check the change in shape of the residual limb.
Position the residual limb such that the flexion angle is
approx. 10°.
Wet the plaster bandages and wrap completely around
the residual limb.
Isolate the plaster bandages with plastic film.
Pull two nylon stockinettes or two layers of Perlon
stockinette over the plaster cast, allowing a small
amount to protrude distally.
Pull a suitable latex casting bag over the plaster cast
and seal proximally.
Connect the vacuum hose and position the distal con­
nection of the casting bag on the nylon stockinette or
the Perlon stockinette.
Switch on the vacuum pump (vacuum: min. 500 mbar).
If the shape of the residual limb changes signific­
antly when the muscles are tensed: instruct the
patient to tense and relax the residual limb muscles
alternately while the plaster is curing.
Let the plaster cure.
Harmony System