Ottobock 3R93 Instrucciones De Uso página 25

4.2.1 Deactivating/Activating the locking function
CAUTION
Risk of falling. It is very important to inform the patient about the changed functionality of the
knee joint after deactivating the locking function.
Upon delivery, the locking function is permanently activated. Similar to conventional knee joints
with lock it can be manually released with the pull cable (Fig. 2, item E), e.g. for sitting down.
Deactivating the locking function (permanently)
1. Using a screwdriver, carefully remove the blue-silver 4G551 Cover Cap which is located on
the joint's left side (in walking direction) (Fig. 4, item A).
2. Fully extend the knee joint.
3. Unscrew the 506G3=M4x18 Set Screw (Fig. 5, item A) using 710H10=2X3 Adjustment
Wrench (Fig. 5, item B).
4. Apply 636K13 Loctite® to the 506G3=M4x18 Set Screw and – while simultaneously pulling
the cable (Fig. 5, item C) – use 710H10=2X3 Adjustment Wrench to clockwise screw in the
screw up to the stop. The 4G539 Latch (Fig. 5, item D) can then no longer engage in its origi-
nal position after letting go of the cable.
5. Reattach the cover cap.
Now the locking function is permanently deactivated. The lock will no longer engage when the joint
reaches full extension. Stance phase stability is now provided by the brake mechanism.
Activating the locking function
It may become necessary to reactivate the locking function due to decreasing mobility of the patient:
1. Using a screwdriver, carefully remove the blue-silver 4G551 Cover Cap which is located on
the joint's left side (in walking direction) (Fig. 4, item A).
2. Unscrew the 506G3=M4x18 Set Screw (Fig. 5, item A) counter-clockwise using 710H10=2X3
Adjustment Wrench (Fig. 5, item B).
3. Apply 636K13 Loctite® to the 506G3=M4x18 Set Screw and screw in again, but only to the
extent that the 4G539 Latch (Fig. 5, item D) engages when reaching full extension.
CAUTION
Risk of falling. If the set screw is screwed in too much, this may impede correct use of the
locking function, because the latch cannot engage. Screw in the set screw only to the extent
that the movement of the latch when pulling the cable is not impeded.
4. Reattach the cover cap.
Lock slide and pull cable
In order to enable the patient to walk with the knee joint in free motion, the lock slide (Fig. 1,
item 3a) is designed so that it can be secured also in the unlocked state.
The lock slide should be mounted on the lateral side of the socket.
For mounting the lock slide on the socket, the perlon cord (Fig. 1, item 3b) should be shortened
so that the complete pull cable (Fig. 1, item 3b) will be slightly tensed in the mounted state.
The joint lock should unlock only after a pull cable stroke of approx. 10 mm.
3R93 Ottobock | 25