Otto Bock C-Leg 4 User manual

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C-Leg 4 3C98-3/3C88-3
Academy
Certification course complete –V 1.6

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Agenda
1. Introduction
2. Gait cycle
3. Component selection
4. Alignment and adjustment
5. Cockpit App
6. User instructions
7. Service and warranty concept
8. User training
Certification course | C-Leg 4 | Global Academy | 225.09.2019

| © Ottobock
Introduction
Certification course | C-Leg 4 | Global Academy | 3
The development of C-Leg 4
25.09.2019
•With its evolution, the improved C-Leg offers
additional benefits for users of high MG2, MG3
and low MG4 –primarily more safety and
improved dynamics
•An enhanced stumble recovery minimizes the
risk of falling
•Furthermore, stance release and standing with a
flexed knee are now a lot easier and therefore
noticeably improve the user’s flexibility and
freedom of movement

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Introduction
Certification course | C-Leg 4 | Global Academy | 4
Goals which were set during development
25.09.2019
•Improved swing phase behavior
•Broader range of ADL’s
•Enhanced safety
•Easier use for user and CPO
•Improved outcomes for user and CPO
•Broader group of users
•Maintain and improve proven C-Leg
stability

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Introduction
Certification course | C-Leg 4 | Global Academy | 5
Technology
25.09.2019
Tube clamp
Inertial Motion Unit (acceleration
sensors and gyroscope)
Charging plug
Servo electronics
Battery / knee angle sensor
Hydraulics
Main electronics
Bluetooth
Tube stop

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Introduction
Certification course | C-Leg 4 | Global Academy | 6
Technology –New control concept for C-Leg 4
25.09.2019
Detected parameters (sampling rate: 100 Hz)
•Knee angle
+ angular velocities
•Knee extension moment
•Inertial Motion Unit (IMU)
Linear accelerations
+ velocities & distances
Orientation of shank in space
+ angular velocities
•No ankle sensor needed due to IMU

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Introduction
Certification course | C-Leg 4 | Global Academy | 7
Technical overview
25.09.2019
Notation:
3C98-3 / 3C88-3
Weight:
1.250 g / 2,8 lbs
Amputation
level:
KD / TF / HD
ROM:
130°
Mobility grade:
2 / 3 / 4
Integrated:
Bluetooth
System height:
Distal: 289 mm
Prox. 3C98-3: 5 mm
Prox. 3C88-3: 26 mm
Operation
time:
approx. 2 days of
average use
(recommended to
charge every night)
Maximum user
weight:
136 kg / 300 lbs
Water
protection:
IP67
(weatherproof but not
corrosion resistant)

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Introduction
Certification course | C-Leg 4 | Global Academy | 8
Technical overview
25.09.2019
•The knee joint is weather-proof but not resistant to
corrosion
•Should the knee joint come into contact with salt water,
chlorinated water or other solutions remove the protective
cover if necessary. Clean the knee joint, tube adapter and
protective cover
•Use fresh water and lint-free cloth and allow the
components to fully air dry
If the knee joint shows a malfunction after drying it must
be inspected by an authorized Ottobock Service Center!

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Introduction
Certification course | C-Leg 4 | Global Academy | 9
Technical overview
25.09.2019
Knee-
extender

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Introduction
Certification course | C-Leg 4 | Global Academy | 10
Technical overview
25.09.2019
Important!
With C-Leg 1/2/3
6° inclination of pyramid
Be careful with test
fittings!
•If an additional Protector or Guard are used at
least 10 mm additional safety distance are
needed!
•When using a 4R57 rotation adapter take care
that the push-button is positioned medially!