Otto Bock C-Leg User manual

A: Sensor Calibration
Calibration (Zero Setting)
The system can be calibrated prior to the user donning
the prosthesis: Simply hold the knee in full extension
with the foot off the ground and hit the “Calibrate”
button. Or, have the user stand with knee extended and
prosthesis off the ground. Click on “Calibration.” Plumb
bob icons will appear over both the Knee Angle Box and
Toe and Heel Load Box.
B: Stance Phase Adjustments
2. Static Maximum Toe Load
(Preliminary Adjustment)
Enter the length of the prosthetic foot (in cm) and the
user weight in the appropriate boxes. An estimated
Maximum Toe Load will be generated. Click “Accept
value.” Note: This setting may be too high for a new user
initially. You may need to manually lower this setting for
the user to successfully initiate swing.
3. Static Stance Flexion Damping
(Preliminary Adjustment)
Have the amputee sit down slowly. The user should
feel the stabilizing effect of the C-Leg stance resistance.
Adjust so that the user can sit comfortably. Makesure
that the user “loads” the prosthesis while sitting.
4. Dynamic Maximum Toe Load
(Dynamic Fine Adjustment)
Automatic Adjustment: Have the user begin walking
and the computer looks for ten consistent steps. When
the computer has counted down to zero, a Maximum Toe
Load value will be generated.
Manual Adjustment: If the user has an inconsistent gait
pattern the manual adjustment may be used. Have the
amputee walk and examine the Toe Load Box. Adjusting
the Maximum Toe Load parameter up or down changes
the position of the orange line in the toe load area. When
properly adjusted the blue toe load boxes should just
come up to meet the orange line not going above or
below the line for most steps.
The Maximum Toe Load should be checked walking
at the user’s average gait speed before completing the
fitting session after alignment is complete.
Adjusting plantar and dorsiflexion will affect
thissetting!
C: Swing Phase Adjustments
(Dynamic Fine Adjustment)
5. Swing Phase Control (heel rise control)
With the user walking in the parallel bars, check swing
phase movements of the shin and make necessary
adjustments (see 5.1 to 5.3). Recheck outside the
parallel bars when the user is ready. To optimize these
parameters, unplug the Interface Cable (if applicable) so
the user can move around freely.
5.1 Dynamic Factor
Start at two. This parameter is used to adjust the
dynamic swing flexion damping of the C-Leg. Increase
Dynamic Factor to lower heel rise if it is excessive. Lower
Dynamic Factor to increase heel rise if it is insufficient.
It is important to have the user walk at all gait speeds
(especially at a fast pace). This adjustment continuously
readjusts the flexion resistance as the user changes
walking speeds.
5.2 Knee Angle Threshold
Start at 40. Adjust the knee angle threshold to
determine when Dynamic Factor resistance should
activate. This should be lowered if damping feels too
abrupt to the user. It should be raised or lowered if just
a small increase or decrease in heel rise is necessary.
Typical range is 35-45. Observe the knee angle being
achieved by watching the angle being measured in the
knee angle box.
5.3 Initial Swing Flexion Damping (this setting only
appears on the “Advanced Settings”screen)
Start at 20. This setting resists all knee flexion at a
constant rate. Leave this adjusted
to a low level (minimum) for
energy efficiency.
6. Swing Extension Damping
(terminal impact control)
Start at 70. Adjust to dampen
terminal impact during swing
phase. Watch for equal stride
length and equal timing. Usual
adjustment range is 60-75.
Quick Guide #2
C-Leg® Adjustment Overview
Ottobock · P 800 328 4058 · F 800 962 2549 · www.ottobockus.com
Connect the Interface Cable to the C-Leg and to the PC before starting C-Soft software.
s Attention: ONLY make adjustments when the user is standing still or sitting!
!

D: Stance Phase Adjustments
(Dynamic Fine Adjustment)
7. Stance Flexion Damping
Fine-tune the Stance Flexion Damping for smooth,
secure resistance while descending stairs and ramps.
When this is set properly for these activities, the
resistance should be adequate for stumble recovery.
Usual adjustment range is 90-104.
8. Stance Extension Damping
Start at 120. This adjustment is necessary for those users
who walk with stance phase knee flexion. If they do not
exhibit stance phase knee flexion during the gait cycle,
this adjustment will not change their gait pattern and
can be left at 120. If they do exhibit stance phase knee
flexion during the gait cycle, this adjustment will be set
to either 115 or 120 for most users. Stance Extension
Damping will smooth the transition from a flexed knee
at the end of loading response to a fully extended knee
during terminal stance. After observing the user’s gait
pattern changes can be made to this adjustment to
ensure smooth extension of the knee at terminal stance.
9. 2nd Mode and 3rd Mode Adjustments
1. Basic Flexion Damping
(Starting Position of thevalve)
This adjustment sets the valve position when fully
extended. At 20 the valve is wide open. At 120 the valve
is fully closed.
2. Increased Damping with Knee Angle
(Rate at which the valve closes)
This adjustment tells the microprocessor how fast the
valve should close based on the knee angle. At zero the
valve does not change position from the starting position
(Basic Flexion Damping value) as the knee is flexed. At
one the valve closes very slowly as the knee is flexed. At
50 the valve closes very fast as the knee is flexed.
These two adjustments should be adjusted together to
allow a certain degree of knee flexion until the knee
locks in that position. If the user wishes to have minimal
resistance (free swing) in 2nd mode, for example when
riding a bicycle, set both values to a minimum (20 and
0). If the user has this configuration for 2nd Mode,
remind them to switch back to 1st Mode immediately
after bike riding or to actively use the hip extensors
when walking in 2nd Mode. If the user wishes the knee
to be locked in full extension for 2nd Mode, set Basic
Flexion Damping at maximum(120). Bicycling cannot
be selected for 3rd Mode due to safety.
E: Document All Adjustment Values
10. Data Overview
The Data Overview allows settings to be saved to the
computer or printed. The settings can also be moved
over from the computer to a C-Leg. The “Amputee Fitting
Protocol” in the C-Leg manual can be used to document
more information (length of pylon, etc.).
This Abridged Version is meant as a quick overview.
Please read the Instruction Manual completely to fully
understand all C-Leg functions and adjustments.
Further information on training a user to utilize the
C-Leg can be found on Quick Guide #3 C-Leg Patient
Training Overview
Ottobock · P 800 328 4058 · F 800 962 2549 · www.ottobockus.com
C-Leg® Adjustment Overview Continued, page 2
C-Leg® is a registered trademark of Otto Bock Health Care GmbH. LuXon, Axtion, C-Walk and Lo Rider are registered trademarks and trademarks of Otto Bock HealthCare LP. ©2012 Otto Bock HealthCare LP. • 12062361.2 • 6/12