Otto Bock 3R93, Instructions For Use Manual

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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=M4x16 Set Screw (Fig. 5, item A) counter-clockwise using 710H10=2X3
Adjustment Wrench (Fig. 5, item B).
3. Apply 636K13 Loctite® to the 506G3=M4X16 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
.
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 Adjusting the Braking Function
CAUTION
Risk of falling due to incorrect brake function setting.
In case of incorrect brake function setting,
the knee joint might flex unintentionally or the brake get stuck, what can cause the patient to fall.
The sensitivity of the brake must be set such that a sufficient braking effect is guaranteed and
the brake does not get stuck when the prosthesis is unloaded.
Observe the following adjustment instructions.
Factory setting of the sensitivity of the brake is such that in general it does not have to be adapted
to the patient. If required, however (e.g. in case of higher body weight), the sensitivity of the brake
can be adjusted by turning the adjustment screw (Fig. 6, item A) using an Allen wrench (size 4 mm).
Before adjusting, flex the joint and open the front, blue cover cap (Fig. 6, item C). Upon delivery
the adjustment screw is set to
level 4
of the scale (highest brake sensitivity).
Turn the adjustment screw clockwise by maximally one turn in order to reduce brake sensitivity.
The patient must be sitting when making this adjustment: