Battery capacity
During normal operation in the 1st and 2nd modes, the battery capacity is indicated with different vibration signals:
Battery capacity
Vibration impulse
Approx. 1 hour of operation remains
3 ×
Approx. 30 min. of operation remains
5 ×
When turning off
10 ×, then turns off
Empty battery mode
The C-Leg automatically switches to empty battery mode when the battery is almost empty. In this mode, the pros-
thesis either sets “high flexion damping” (high safety/reduced comfort) or “low damping” (less safety/higher activity).
This allows the patient to walk even though the system is not active.
The standard factory setting for the knee joint is “high flexion damping”. The prosthetist is responsible for deciding
whether the patient can safely use the “low damping” setting when the empty battery mode is active. This setting
can only be changed through the C-Soft adjusting software, V2.4 or higher.
CAUTION
Danger when empty battery mode is activated.
Depending on the setting (made by the prosthetist using
C-Soft V2.4 or higher), the prosthesis sets either "high flexion damping" (high safety/reduced comfort) or "low
damping" (less safety/higher activity) when empty battery mode is activated. In certain situations, this can cause
the patient to fall.
During the fitting process, the prosthetist must inform the patient of the selected damping behaviour during empty
battery mode.
For the "low damping" setting in empty battery mode, the patient must have the necessary muscular and cognitive
abilities to control a freely moving knee joint without stance phase locking.
If an empty battery was the reason for entering the empty battery mode, then the operating mode (1st mode) can
be selected again by charging the joint.
Safety signal for incorrect connection to the tube adapter
CAUTION
Safety signal occurs.
The safety signal indicates an error of the joint. When in this condition, malfunctions can
occur. This can cause the patient to fall.
In the event such a safety warning occurs, stop all activities with the C-Leg and resolve the error by properly con-
necting the tube adapter (to be performed by your prosthetist or a service technician). Insofar as a contact failure
has occured between the plug of the tube adapter and the C-Leg (e.g. following the fitting by the prosthetist),
send the knee joint (incl. tube adapter) to an authorized Ottobock Service Centre.
As soon as the tube adapter has no connection when the C-Leg is in operation (i.e. 1st, 2nd, 3rd or standing mode
with sufficient battery capacity), the C-Leg emits short beeps and, for the duration of approximately five minutes,
slowly pulsing vibration signals. The C-Leg will activate the stance phase damping and maintain it until the tube
adapter cable is correctly attached (provided the battery capacity remains sufficient).
Ventilation
Air may accumulate in the hydraulic unit if the C-Leg is not stored in an upright position. This is noticeable through
sounds and irregular damping behaviour.
The automatic ventilation mechanism ensures that all functions of the C-Leg are again intact after approximately
10 – 20 steps.
C-Leg Prosthetic System
24 Ottobock
