Ottobock 3R17 Gebrauchsanweisung Seite 10

2.5 Lock mechanism
When the knee is in full extension, the Compression Spring (22) forces
the Lock Cam (16) into position against the distal segment of the Upper
Joint Section (1). This blocks flexion of the knee.
The adjustable Extension Stop (3) controls hyperextension of the knee.
When the Lock Handle (28) is pulled upward, the Lock Lever (17) rotates
the Lock Cam (16) downward, unlocking the knee and permitting it to flex.
On reaching full extension once again, the Compression Spring (22) forces
the Lock Cam (16) back into position locking the knee automatically.
If the patient wishes to walk with a free knee, the Lock Handle (28) is de-
signed so that it will hold the lock mechanism disengaged and override the automatic lock feature.
In place of the Lock Handle (28) the 4F34 Lock Control Unit may be used, which is adjustable
left or right and for push or pull.
3 Alignment recommendations and assembly
The three-dimensional arrangement of the prosthetic socket and modular elements affects the
prosthesis' static and dynamic functions. The position of the residual limb must be taken into ac-
count for the connection to the socket. Plumb lines in the frontal and sagittal planes from the hip
joint's center of rotation marked during plaster cast taking and trial fitting of the test socket will
facilitate correct positioning of lamination anchor or socket adapter.
The prosthetic foot and knee joint are aligned according to the recommended values. Recommen-
ded assembly position: The reference alignment line runs through the anterior, upper axis (i. e.
10-15 mm posterior placement of the joint, see illustration). Function of the joint is influenced by
the position of the axes. Thus when providing basic alignment, the two lower axes should create
a horizontal line from the lateral aspect.
We recommend using the Ottobock device for alignment L.A.S.A.R. Assembly 743L200 (or the
configuration appliance 743A100). The L.A.S.A.R. posture 743L100 has succeeded in optimizing
the alignment of the prosthesis for the patient.
Depending on the patient's functional demands, the following prosthetic feet can be used:
• 1G6 Cosmetic Light Foot, 1G9 Pedilen Single Axis Foot, 1H... Single Axis Foot, 1S... SACH
Foot or 1D10/1D11 Dynamic Foot
For alignment specifications and weight limits of prosthetic feet, please use the operational
instructions for the respective foot set-up.
4 Adjusting the extension stop (fig. 2)
The Extension Stop (3) can be adjusted with the Set Screw (5) to control the amount of hyperex-
tension movement in the knee when the lock is engaged.
Flex the Knee Joint until the Set Screw (5) becomes accessible (4 mm Allen wrench).
Turning clockwise = reduces hyperextension movement
Turning counter-clockwise = increases hyperextension movement
Important:
Reducing the hyperextension movement makes it more difficult for the lock to engage.
10 | Ottobock
Reference
alignment line
10-15 mm
3333 / 3311