Otto Bock 3R21 Instructions For Use Manual page 17

► Remove protruding set screws
set screws .
7.2.1 Fabricating the Definitive Socket
The following instructions only apply to the KD variant of the product.
Required materials:
>
4x501T1=M5X16 Slotted Truss Head Screw, 4x 502R1=M5X16
Two Hole Nut, 616G12* Carbon Fibre Woven Fabric, 623T3*
Perlon Stockinette, 616G13* Woven Fibreglass Stockinette,
617H19* Orthocryl Lamination Resin, 617H17* Orthocryl soft,
4G70 Lamination Anchor
1) Secure the connection between the lamination anchor and pros­
thetic socket with the help of the truss head screws and two hole
nuts.
2) INFORMATION: For stability, a different alignment of the
carbon fibres and an overlap of 3 cm to the edge of the lam­
ination anchor are important.
Cut two pieces of carbon fibre cloth to size as a mat according to
the edge of the lamination anchor.
3) Position the two pieces on the lamination anchor.
4) Cut a piece of Perlon stockinette to twice the length of the plaster
positive and pull on one half.
5) Twist the Perlon stockinette on the distal end and pull on the other
half.
6) Cut a piece of woven fibreglass stockinette to the corresponding
length and pull on the length equal to two-thirds of the prosthetic
socket.
7) Tie off the woven fibreglass stockinette on the distal end and pull
on the length equal to half the prosthetic socket.
8) INFORMATION: The double casting process is used for lam­
ination.
Cast the distal section of the prosthetic socket (2/3 of the length)
with Orthocryl lamination resin and allow it to cure.
9) Cut a piece of Perlon stockinette to twice the length of the plaster
positive and pull on one half.
and replace them with shorter 10) Twist the Perlon stockinette on the distal end and pull on the other
half.
11) Cast the prosthetic socket with Orthocryl soft and allow it to cure.
7.3 Optimising the static alignment
► Check and optimise static alignment on standing patient (see
5
Fig. on page 4).
► If a measuring device for representing load lines is available,
check the distances indicated in Figure
the prosthesis alignment as necessary.
7.4 Optimising during dynamic trial fitting
CAUTION
Adjusting the Settings
Fall due to incorrect or unfamiliar settings
► Only adapt the settings to the patient gradually.
► Explain the effects of the adjustments on the use of the prosthes­
is to the patient.
Adjusting the extension assist
6
• on page 5:
: Increasing the spring tension
: Reducing the spring tension
: Replacing the spring
► For adjusting the extension assist, note Figure
► CAUTION! The lower leg of the prosthesis must not swing
through too far in the dorsal direction at the beginning of the
swing phase.
Adjust the extension assist so that the lower leg of the prosthesis
swings through in the dorsal direction according to the patient's
requirements, but reaches full extension in a timely manner for the
next heel strike.
► If necessary, substitute weaker spring in place of one that is too
6
strong (see Fig. on page 5).
5
on page 4 and correct
6
on page 5.
17