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•
Insert the Cable Casing (18) into th
proximal end of the Upper Spring Retainer
(19).
•
Slide the appropriate Spring (20) onto the
Cable (17).
•
Attach the Lower Spring Retainer (21) to
the distal end of the Cable (17) with the
slot in the retainer.
•
Slide the Spring Housing (22) over the
Spring and assembly and insert into the
Upper Spring Retainer (19).
Installation of Extension Assist into TKO
1500
•
Insert the Hook on the proximal end of the
Cable (17) into the retaining hole on the
inner wall of the TKO 1500.
•
Apply tension to the Extension Assist while
allowing the TKO 1500 unit to move toward
a fully extended position.
•
Allow the Cable (17) to seat into the slot in
the knee cap.
•
Insert the proximal end of the Cable Casing
(18) into the opening in the distal end of
the knee cap.
•
Fasten the Extension Assist to the pylon
with the metal Pylon Clip (23).
Adjusting Swing Phase
I.
After installing the external extension
assist, the pylon and knee should initially
be perpendicular to floor (90˚).
II.
Turn friction adjustment screw counter-
clockwise and reduce swing phase friction
on the knee until little or no friction occurs.
(If the friction is fully reduced and the knee
feels stiff see COMMONLY ASKED
QUESTIONS.)
III. External extension assist should provide a
small amount of terminal impact. If this
does not occur, replace light duty spring
(yellow) with heavy duty spring (blue) or
extra heavy spring (red).
IV. You are now ready to reduce the terminal
impact by tightening the friction adjustment
screw. Do not exceed 4 Nm (3 ft-lbs) of
torque.Over torquing the adjustment
screw may cause the knee to lock at
inappropriate times during swing phase.
The amount of terminal impact required will vary
from amputee to amputee, based on activity
level.
25. Alignment Reference Line
NOTE: Alignment reference line is equal to
weight line.
26. Weight Bearing Line is 9 mm Anterior to
Knee Axis Center
27. Pylon Vertical
Adjusting the Stability of the TKO 1500™
28. Posterior Tilt
Knee tilted backward
29. Anterior Tilt
Knee tilted forward
30. Vertical
Using proximal and distal pyramid system,
adjust angle of the knee for stability and knee
release. This adjustment changes the sensitivity
of the stance control lock. The knee can be
adjusted to produce a positive locking moment
with application of 5.4kg(12lbs) at midstance or
3.6kg(8lbs) at initial contact with the knee
extended or in a flexed position.
28. Posterior Tilt Knee tilted backward
Posterior tilt - delayed release of brake.
Maximum sensitivity. Results in the knee
locking at heel strike and remaining locked
through terminal stance. This adjustment
will result in the knee unlocking from
midstance to terminal stance. The further
the knee is tilted posterior the longer the
knee will remain locked.
29. Anterior Tilt Knee tilted forward
Anterior tilt - earlier release of brake.
Minimun sensitivity. Results in the knee
locking at heel strike and unlocking during
terminal stance. The further the knee is
tilted anterior the sooner it will release.
NOTE: In order to maintain correct socket
flexion, make equal but opposite angulation
changes above and below the knee unit with
adjustment screws on adapter.
Switching Extension Assist Springs
•
Remove Extension Assist assembly from
knee unit.
•
Remove Spring Housing (22) from Upper
Spring Retainer (19).
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