Ottobock 3R93 Instrucciones De Uso página 26

CAUTION
Risk of falling if the lock does not properly engage. If the pull cable has been mounted incor-
rectly (lock opens unintentionally at knee flexion moment; lock does not engage at full exten-
sion), the knee joint might flex unintentionally what can cause the patient to fall. Test the locking
function after all adjustments.
4.2.2 Fabricating a socket with lock slide and pull cable
INFORMATION
Please note that, when laminating the dummy, the threaded plate to hold the lock slide also has
to be laminated into the socket. These should be centred in the matrix thickness.
Preparation for lamination
1. Pre-cut the thread in the threaded plate with an M4 thread cutter (Figure 12). The threaded
plate is used to mount the lock slide.
2. Fill the bore in the threaded plate with plastaband (Figure 13).
Laminating
The channel is laminated into the socket with the help of the 21A18=4 dummy (not included in
the scope of delivery).
3. Pull a PVA film over the plaster positive (Figure 14).
4. Depending on the body weight and load, pull several layers of nylglass and carbon over the
PVA film.
5. Isolate the dummy for the channel with silicone grease and position it (Figure 15).
The channel should be positioned so that the pull cable can be connected to the latch of the knee
joint in a straight line at both ends after completion.
6. Position the threaded plate on the lateral socket side in a position that is easy for the patient
to reach (Figure 15).
7. Laminate the threaded plate into the socket.
A sufficient laminate thickness must be chosen so that the threaded plate does not turn later on
while completing the thread cutting process.
8. Apply the remaining layers of nylglass and carbon (Figure 16).
The dummy and threaded plate should be centred in the matrix thickness.
9. Laminate the socket in the usual way and allow it to set.
10. Trim and grind the socket.
11. Remove the dummy (Figure 17).
12. Drill out the plastaband from the threaded plate with a ⌀ 3.2 mm drill bit (Figure 18) and finish
cutting the thread with an M4 thread cutter.
Mounting the lock slide
13. Mount the lock slide on the socket (Figure 19).
Mounting the pull cable
14. Attach the karabiner to the latch. The opening of the karabiner faces the joint (Figure 20).
15. Thread the pull cable through the resulting channel in the laminate (Fig. 21).
26 | Ottobock 3R93