Otto Bock 3R46 Instructions For Use Manual page 14

4.3 Adjustments and final assembly
4.3.1 Socket fabrication
4.3.1.1 Lamination prior to trial fitting
Take a piece of 623T3 Perlon Stockinette twice the length of the plaster model and pull half of it
over the isolated socket. Twist the other half of the stockinette on the distal end and reflect it over
the socket. In order to absorb strong forces in the area of the modular knee joint, the socket must
be gradually reinforced with 616G13 Fibreglass Stockinette. To do this, pull over the first layer to
2/3 of the socket length, tie it off and then reflect it up to half of the socket length. Put 2 layers of
616G12 Carbon-Fibre Cloth on the distal area so as to provide an underlying base with a pro-
jecting brim of 3 cm around the 4G70 Adapter, which will be mounted later in the procedure. Pull
on two layers of 623T3 Perlon Stockinette. The socket lamination is performed in two stages. In
the first stage the socket is laminated up to 2/3 of its length with 617H19 Orthocryl Lamination
Resin. In the second stage the proximal part of the socket is laminated with 617H17 Orthocryl
Flexible Resin. Once the first casting has hardened, pull on 2 more layers of 623T3 Perlon Sto-
ckinette before laminating the proximal part of the socket with 617H17 Orthocryl Flexible Resin.
The lamination anchor serves to restrict flexion by stopping at the shock guard (20)
(Fig. 2). This stop function must also be taken into consideration after the final lamination.
To ensure a proper flexion stop and to prevent damage, the set screw (12), which may
be too long for certain adjustment positions, should be replaced by a shorter one (12a).
4.3.1.2 Applying the lamination anchor
The correctly fitted lamination anchor must be prepared before it is glued to the socket. To do so,
fill the coupling opening with 636K8 Plastaband (Fig. 3). Clamp the residual limb bedding and
the joint into the alignment apparatus.
Attention !
Remove any soft, flexible or porous materials from underneath the supporting surface of
the lamination anchor. Mix the putty exclusively from 617H21 Orthocryl Sealing Resin
and 639A1 Talcum Powder. Glue on the lamination anchor.
Secure with 627B2 Adhesive Tape for trial fitting. Test the stop function. If necessary, form the
required contact surface with putty. If need be, glue a stop made of Pedilin onto the outer laminate.
4.3.1.3 Finalizing the socket
Once the trial fitting has been completed, fasten the lamination anchor to the socket with truss
head screws (17) and two-hole nuts (18). Then laminate.. Then proceed with reinforcement as
follows: Pull one layer of 623T3 Perlon Stockinette over the entire socket and tie circularly on
the top. Apply two layers of 616G12 Carbon Fiber Cloth over the arms of the 4G70 Adapter.
Then pull the remaining half of the 623T3 Perlon Stockinette back over the socket. The carbon
fiber layers are thus sandwiched between the stockinette layers. Again reinforce the socket in
increments with 616G13 Fiberglass Stockinette (see Section 4.3.1.1). Apply two layers of 623T3
Perlon Stockinette. Proceed with lamination as described in Section 4.3.1.1.
Attention !
Deviating from the processing instructions or the recommended materials for the lami-
nation of the lamination anchor can result in a loosening or breaking of the adapter.
14 | Ottobock 3R46