Össur MAUCH KNEE, Instructions For Use Manual, Page: 6 / 67

6
NOTES
• The pyramid is shifted 6mm in an anterior direction from the knee
axis.
• If the weight line is too far anterior to the knee axis, the knee may
require more effort to create a hyperextension moment that will
disengage the stance control and allow for fluid initiation of the knee
flexion.
• Premature knee flexion may result from a weight line position too
posterior to the knee axis.
SWING PHASE
The Mauch system is designed to provide variable hydraulic resistance to
flexion and extension during swing phase based on changes in the user’s
walking speed. The resistance settings can be adjusted by rotating the
cap atop the control cylinder.
FLEXION RESISTANCE (Figure 3)
Turn the cap relative to the indicator mark for flexion.
• Extreme left arrow indicates minimum resistance
• Arrow at
“A” indicates medium resistance
• Extreme right arrow indicates maximum resistance
Remember the selected value of flexion resistance.
EXTENSION RESISTANCE (Figure 4)
Turn the cap to either extreme to move the indicator mark.
• 1 is minimum resistance
• 5–6 is medium resistance
• 10 is maximum resistance
Make sure you reset the correct value of flexion resistance before asking
the patient to walk
STANCE PHASE (Figure 5)
The Mauch stance control system is designed to provide hydraulic
yielding resistance to knee flexion when the prosthesis is loaded. This
assists the user in descending stairs foot over foot and in stumble
recovery. The stance resistance or yielding rate can be adjusted using the
screw near the U-Lever on the piston rod.
• Full clockwise rotation sets the minimum yielding rate (maximum
stance resistance).
• One-third rotation counterclockwise sets the maximum yield rate
(minimum stance resistance).
Do not exceed one-third rotation.
SPECIALIZED MODES OF OPERATION (Figure 6)
U-Lever (Mode Selector Switch)
The Mauch system is designed to provide the user with a manual lock
and a Swing Only mode of operation. These functions are engaged and
disengaged through the U-Lever or mode selection switch located near
the top of the piston rod. The manual lock may be useful when the user
requires additional safety. Swing Only mode is useful during rowing,
running, or cycling activities.
• Manual Lock or Swing Only mode engaged. U-Lever in up position.
• Manual Lock or Swing Only mode disengaged. U-Lever in down
position.