Ossur TOTAL KNEE 1900 Bedienungsanleitung Seite 8

Patient Weight
90–100 kg (200-220 lbs)
• Install appropriate bumper according to patient weight.
• Re-install the bumper cover by hooking the groove under the chassis
front and pushing the two pins into the chassis holes.
• Active patients may require a stiffer bumper.
• Patients who have previously worn a prosthesis without a stance-
flexion feature may initially prefer a stiffer bumper.
• We suggest trying a softer bumper after two weeks of trial. This helps
the patient develop security with the knee. Doing this will also help
make the transition to the stance-flexion characteristic more acceptable.
STATIC ALIGNMENT
For safety, please make initial adjustments with patient standing between
parallel bars!
• Fit prosthesis and check for correct length.
• Make sure foot is flat on the floor, knee is in neutral position and
socket angles are correct.
• When the patient shifts weight onto the prosthesis, the geometric
lock is activated and the bumper should be slightly compressed.
Modify alignment if necessary.
• Explain function of stance flexion/geometric lock to patient. Ask
patient to activate it by stepping forward with prosthesis and
transferring weight onto heel.
• Patient should become accustomed to activating geometric lock and
resulting stance flexion movement.
• Knee cannot collapse as long as geometric lock is activated.
DYNAMIC ALIGNMENT
The model 1900 Polymer Friction Knee is designed to provide smooth
and fluid friction swing control through the mechanical manipulation of
a unique polymer medium. Swing control can also be enhanced through
use of the extension promoter and optional extension assist.
For safety, please make initial adjustments with patient standing between
parallel bars!
Polymer Friction Adjustment (Figure 9)
Friction adjustment screw – clockwise adjustment increases friction.
• Loosen the set screw (15), with a 2.5mm hex wrench ½ turn. Do not
completely remove the set screw from the housing unit.
• Using a large blade screwdriver, turn the adjustment screw on the
anterior aspect of the knee (16) clockwise to increase friction
resistance to flexion and extension.
• Do not exceed ¼ turn for maximum adjustment (17).
• After obtaining the desired friction setting, you must tighten the set
screw (15) to secure the adjusted setting. DO NOT over tighten the
set screw. Torque to 2Nm(17 in-lbs).
Bumper adjustment
• Try different bumpers and select the most comfortable one.
• Final bumper selection may vary from bumper indicated for patient's
weight according to table.
• Soft bumpers increase the locking moment of the Geometric Lock
and increase stance flexion motion.
8
Colour
Yellow
Type
Extra Firm